Leave the repairs and renovations of condominiums and apartments in Hadano City, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!

Large-Scale Repairs for Condominiums, Apartments, and Buildings in Hadano City

Large-scale repair work that can be handled in Hadano City

Large-scale repairs are not just “exterior wall painting” or “waterproofing,” but rather a comprehensive repair work that addresses the overall deterioration of the building while scaffolding is in place. At Kakeru Koumuten, we can handle all of the following work in-house, ensuring clear responsibility and coordination of the process.

Scope of Major Repairs Determined from Building Diagnosis

It is not guaranteed that all of the above works will be performed. The extent of the work will be determined based on the results of the building diagnosis. At Kakeru Koumuten, we conduct a free on-site survey to confirm the items below, compile them into a deterioration diagnosis report with photos, and propose the scope of work.

Reasons Kakeru Koumuten is Chosen for Large-Scale Repairs in Hadano City

The reason why we can be entrusted with large-scale repairs in Hadano City is partly because “Kakeru Koumuten has a base in Yokohama City”, but also due to our “unique initiatives in large-scale repair work that cannot be imitated by other companies”, which have received high praise from many customers.

1. Equipment Specialized for Exterior Renovations

At Kakeru Koumuten, we have prepared the following warehouses and material storage areas to provide low-cost, high-quality exterior wall painting and waterproofing work for large-scale repairs. We have established five bases centered around Yokohama City for material storage and showrooms.

In-house Scaffolding Materials

We own the scaffolding materials necessary for temporary scaffolding required for large-scale repairs and can assemble the scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can cut costs related to scaffolding work and provide quick and flexible responses.
We have approximately enough scaffolding materials for 100 single-family homes!

Storage of Materials in Our Large In-house Warehouse

We store paints and substrate repair materials used for exterior renovations. By ordering a large quantity of materials at once, we can procure materials at a lower cost! Additionally, we always have stock available, allowing us to provide rapid responses in emergencies!

In-house Waste Sorting

Large-scale repairs generate various waste materials such as leftover paint, metals, and wood. At Kakeru Koumuten, we sort and recycle waste materials in-house, which helps reduce waste disposal costs.

Showroom Dedicated to Exterior Renovations

In the showroom, you can not only have meetings but also check actual samples and colors of exterior materials. Color simulations for exterior wall painting and heat resistance checks using a heat insulation testing machine are also available!

2. Cost Reduction through In-House Management and Construction

One of Kakeru Koumuten’s major strengths is in-house management and construction.

By managing everything from inquiries to project completion in a unified system, we can keep costs down while providing high-quality large-scale repairs. Additionally, one representative will handle everything from the estimate to project completion. Since the same person will be in charge of sales and construction management, smooth communication is possible.

We can handle everything from temporary scaffolding installation to exterior wall painting, substrate repairs, waterproofing work, and tile repairs with complete in-house construction! Those with specialized knowledge and experience will conduct inspections and actual construction for each process!

3. Obtaining Various Permits and Skilled Workers

We have obtained construction industry permits and permits for industrial waste collection and transportation! We also have nationally certified sheet metal and painting skilled workers, and we are confident in our construction techniques. We can also handle large-scale roofing work for factories! We have qualified personnel for asbestos work supervisors and building materials containing asbestos inspectors, so we can handle and conduct preliminary investigations on roofing materials containing asbestos.

4. Warranty and Aftercare

Most large-scale repair works, including “painting work,” “substrate repair work,” and “waterproofing work,” come with a warranty!
Aftercare is available every year, and we send out notification DM each year.

5. Flexible and Prompt Response

Our company is equipped to handle various troubles and situations related to apartments and condominiums.

We can also address exterior walls and rooftops that cannot be inspected from high places using drones! During rain leak investigations, we can use a thermal imaging camera to help identify the cause of leaks!

We will respond according to your wishes. We also accept emergency measures for sudden rain leaks! We will respond quickly to urgent requests!

6. Staff Development

Our staff create various models for skill improvement and conduct practical training. Since different processing and techniques are required on-site, we regularly conduct skill enhancement training to ensure each staff member can respond appropriately. We also provide education on points to pay attention to and areas to check during large-scale repair work.

7. Consideration for Residents and Neighbors

During large-scale repair work, we not only notify residents and greet neighbors but also set up bulletin boards at entrances to display project schedules and notices! Additionally, we ensure that the manners of visitors are thoroughly educated to minimize inconvenience to residents and neighbors.

8. Strict Quality Control

Each stage is inspected by a responsible person, and detailed construction photos are taken. We use film thickness gauges and check sheets to ensure that no inspections are overlooked. During exterior painting and waterproofing work, we check the number of used paint cans to confirm that the specified amount of paint is used, and we prevent construction defects by ordering paint in-house. Of course, we will also take photos of the used paint and report them.

9. Color Simulation for Exterior Painting

9-1 Self-Color Simulation

The simulations created by our company can be done using photos of your actual apartment or building!You can also perform simulations on your smartphone or computer. By simulating and then changing to a two-tone color or making an image change, we hope to help enhance the stylish appearance and increase occupancy rates! Of course, we can also arrange paint samples for actual color confirmation.

* In Hadano City, the entire area is subject to landscape planning, and changes to exterior wall colors are also subject to notification. There are also district plans (10 districts) and building agreements (34 locations), so procedures may be required depending on the site. Having a color simulation screen will allow for smooth explanations at management association meetings and neighborhood associations.

9-2 Confirm actual colors with a test paint!

You can order samples of the paint you are considering and perform test painting on your exterior wall. By conducting a test paint, you can confirm the actual color and gloss!

9-3 Exterior renovation simulation

Exterior simulations for apartments and condominiums are also possible!
・Exterior wall color simulation (two-tone colors are also possible)
・Simulation for applying metal siding
・Simulation using accent materials such as fascia boards and louvers
・Simulation for roof painting and roof replacement work

With exterior renovation simulations, you can minimize the risk of failure in image changes! We hope that renovating the appearance of your apartment or condominium will help increase occupancy rates.

Cost Estimates for Large-Scale Renovations in Hadano City

The cost of large-scale renovations varies significantly based on the size of the building, its condition, the scope of work, and the materials used. First, please refer to the national average based on public statistics, followed by our company’s cost estimates based on past projects categorized by size, and finally, examples of unit prices for each type of work.

The national average for condominiums is 750,000 to 1,500,000 yen per unit

According to a survey conducted by the Ministry of Land, Infrastructure, Transport and Tourism, which compiled 818 construction cases (FY 2021), approximately 70% of the costs for large-scale renovations are concentrated between 750,000 and 1,500,000 yen per unit, with the most common price range being 1,000,000 to 1,250,000 yen. Note that the amounts in this survey do not include consumption tax and common temporary costs, so they differ from the current total construction costs including tax.

Source: Ministry of Land, Infrastructure, Transport and Tourism “FY 2021 Survey on Large-Scale Renovations of Condominiums” (200 companies, 818 cases) *The amounts do not include consumption tax or common temporary costs. The percentages do not total 100% due to rounding and non-responses.

Breakdown of Construction Costs (What the Money is Spent On)

Source: Ministry of Land, Infrastructure, Transport and Tourism “Fiscal Year 2021 Survey on Large-Scale Repair Work for Condominiums” (Second survey of large-scale repair work. The overall average is 59.0% for construction-related costs, 22.3% for temporary works, and 9.9% for miscellaneous expenses). *The total does not equal 100% because it includes equipment-related work, exterior works, and others. This is an average value and not a criterion for judging the appropriateness of individual estimates.

Cost Estimates by Building Size (Scaffolding, Substrate Repair, Exterior Wall Painting, Waterproofing, Sealing)

*The above estimates are based on Kakeru Koumuten’s construction performance and may vary depending on the presence of roofing work, metal work, plumbing, etc. For condominiums, please also use the national statistics above (750,000 – 1,500,000 JPY per unit) multiplied by the number of units as a reference.

Breakdown of Costs for Temporary Works, Substrate Repair, Exterior Walls, and Waterproofing

The estimate for large-scale repairs is broadly divided into “temporary works,” “substrate repair,” “sealing,” “exterior wall painting,” “waterproofing,” and “miscellaneous expenses.” Before comparing total amounts, please check what each item includes, how much, and at what cost.

Examples of Unit Prices for Repair Work

*Costs and warranty periods vary depending on shape, quantity, substrate condition, and type of materials. For a detailed estimate, please feel free to contact us. Estimates are completely free.

Select Paint and Waterproofing Grades Based on “Years Until Next Repair”

“Good paint = correct” is not always true. The best way to choose is to align when to perform the next major repair with the lifespan of the materials, minimizing waste.

* The estimated lifespan is a general guideline and may vary depending on sunlight, location, and substrate condition. For surfaces that receive strong rain, wind, and sunlight, selecting high-weather-resistant paint and specifications that include rust prevention for metal parts after cleaning will change durability.

Guideline for Repair Reserve Fund and Options When Insufficient

The Ministry of Land, Infrastructure, Transport and Tourism guidelines indicate the guideline for repair reserve funds on a monthly basis per exclusive area. Additional charges are required if there is a mechanical parking lot.

Source: Ministry of Land, Infrastructure, Transport and Tourism “Guidelines on Repair Reserve Funds for Condominiums” (Reiwa 6 June Revision – PDF) / National average is 13,378 JPY per unit per month (Reiwa 5 Fiscal Year Comprehensive Survey of Condominiums)

In the comprehensive survey for the fiscal year Reiwa 5, 36.6% of management associations responded that “the repair reserve fund is insufficient compared to the plan.” There are four main options if there is a shortfall.

Subsidies, Tax Systems, and Loans to Check for Large-Scale Renovations in Hadano City

According to the list of subsidies and grants on Hadano City’s official website, there were no subsidies specifically targeting large-scale renovation work for condominiums found within the confirmed range (Kanagawa Prefecture also does not have subsidies targeting the work itself). The available options can be broadly categorized into four types. The eligibility and application status of these systems may change during the fiscal year, so please be sure to confirm with our company or each contact point before contracting or starting work.(As of October 8, 2026)

① Condominium Longevity Promotion Tax System (Property Tax Reduction)

If large-scale repairs contributing to longevity are carried out on condominiums that meet certain requirements, the property tax for the building will be reduced in the year following the construction. The reduction rate is determined by local ordinances within the range of the reference standards set by the national government (one-third, with municipalities able to set between one-sixth and one-half), and it varies by city. We could not find the city’s reduction rate or declaration destination on Hadano City’s official website (property taxation, management plan certification page), so please confirm with the city’s property tax division instead of applying numbers from articles or materials from other cities directly.

Source: Hadano City “Property Tax” (Updated April 1, 2026) / Hadano City “Condominium Management Plan Certification System” (Updated January 30, 2026) / Ministry of Land, Infrastructure, Transport and Tourism “Condominium Long-Life Promotion Tax System”

② Support for Condominium Management and Earthquake Resistance/Energy Saving Subsidies in Hadano City, Kanagawa Prefecture (Management Associations Start Here)

The “Condominium Management” page of Hadano City provides information on support for earthquake resistance of condominiums, the management plan certification system, and dispatch of condominium advisors from Kanagawa Prefecture. The dispatch of advisors from Kanagawa Prefecture is available to management associations in the prefecture, excluding Yokohama City, Kawasaki City, Sagamihara City, and Yokosuka City, and management associations in Hadano City can also utilize this service.

Source: Hadano City “Condominium Management” / Hadano City “Reiwa 8 Condominium Advisor Dispatch Project” (Updated June 26, 2026) / Kanagawa Prefecture “Condominium Advisor Dispatch” / Hadano City “Support for Seismic Diagnosis, Seismic Retrofitting Plans, and Seismic Retrofitting Work for Condominiums” (Updated April 1, 2023) / Hadano City “[Applications Closed] Zero Carbon Living Creation Subsidy” (Updated May 1, 2026) ※The seismic support page has an outdated update date, so please confirm the current details at the counter.

③ Management Plan Certification System (Tax and Interest Rate Benefits)

This is a system certified by Hadano City, and upon receiving certification, you may be eligible for interest rate benefits on the “Condominium Common Area Renovation Loan” from the Japan Housing Finance Agency and Flat 35 (maintenance and preservation type), which is also one of the requirements for the long-life promotion tax system (certification alone does not guarantee tax reduction).

* There is no application fee for the certification application to Hadano City. However, the “Management Plan Certification Procedure Support Service” provided by the Condominium Management Center, used for prior confirmation, has a system usage fee of 10,000 yen per application, and a review fee for prior confirmation by a condominium management specialist is also required. After obtaining the prior confirmation compliance certificate, the application to the city must be made through that system; direct application to the city without using the system is not possible. Inquiries: Transportation Housing Division, Housing Policy and Migration Consultation (0463-82-9642).

④ National Energy Saving Support | Housing Energy Saving 2026 Campaign

Changes for FY 2026The “Child-Rearing Green Housing Support Project” for FY 2025 has been abolished and reorganized into the successor “Mirai Eco Housing 2026 Project.” Additionally, the “Long-Term Excellent Housing Renovation Promotion Project” will end in FY 2027 and will not be implemented in FY 2028. Please be careful not to base your financial plans on outdated information.

Mirai Eco Housing 2026 Project

Advanced Window Renovation 2026 Project

⑤ Kanagawa Prefecture Subsidies (Applications for Fiscal 2026 have ended)

*The subsidy for existing housing energy saving renovation costs does not cover common areas of rental apartments or units not occupied by the owner.

⑥ Financing System (Housing Finance Agency Condominium Sumairu Loan)

If the management association borrows funds for large-scale repairs, they can utilize the Housing Finance Agency’s “Condominium Common Area Renovation Loan (Condominium Sumairu Loan).”

Source: Housing Finance Agency “Condominium Sumairu Loan” (Official)

Cases Where Fire Insurance Can Be Used and Cases Where It Should Not Be Used

Building Conditions and Repair Points in Hadano City

Hadano City is located in the western part of Kanagawa Prefecture, covering an area of 103.76 km². According to the city’s location optimization plan, the area is surrounded by the “Tanzawa Mountains,” with forests accounting for approximately 52.8% of the entire city. The urban planning area is 10,376.0 ha, of which the urbanized area is 2,438.0 ha, less than a quarter of the city’s total area. The city’s planning documents indicate that old maps from the late 19th to early 20th century show settlements distributed at the foot of the mountains, followed by urbanization in the central area. The population has begun to decline since peaking at 170,145 in Heisei 22 (2010). The presence of different characteristics in one city, such as urban areas around the station, residential complexes along the Odakyu line, lowlands along the Kaname River system, and the foothills of Tanzawa, serves as a starting point for considering large-scale repairs in Hadano City. It should be noted that Hadano City is an inland city not facing the sea, making salt damage from sea breezes less of a primary concern.

Source: Hadano City “Population and Number of Households” (Estimated as of September 1, Reiwa 8, updated September 4, 2026. Estimates based on preliminary figures from the Reiwa 7 national census)／Hadano City Location Optimization Plan (Revised proposal in March, Reiwa 8. Age classifications are based on the national census)／Hadano City “District Plan”／Hadano City “Building Agreements and Regulations” *Different survey dates for each table, hence the timestamps for each value.

We will also confirm the composition of generations and households. According to the national census of Reiwa 2 (2020), the population by age group is as follows: the youth population (ages 0-14) is 18,304 people (about 11%), the working-age population (ages 15-64) is 97,456 people (about 59%), and the elderly population (ages 65 and over) is 49,201 people (about 30%). In Heisei 27 (2015), the elderly population was 26.0%. Based on the population and number of households as of September 1, Reiwa 8, it is calculated that there are about 2.1 people per household. The age groups and population/household numbers are based on different reference dates, so they are merely guidelines. These figures represent the entire city and do not indicate the situation of individual building residents; the composition of generations can vary even within the same city depending on the location.

Buildings in Hadano City are divided into “four faces”

Hadano City has significantly different environments depending on the area: the urban area around the station, residential complexes and housing areas along the Odakyu line, lowlands along the river, and the foothills of the mountains. The type of major repairs that will be necessary for your building will vary depending on its location. Please note that the history of rebuilding or large-scale renovations differs from building to building, so the age of the building should be viewed as a guideline.

Source: Hadano City Land Use Optimization Plan (Reiwa 8, March revision proposal) / Hadano City “District Plan” (Updated April 6, 2026) / Hadano City “Building Agreements and Regulations” (Updated June 12, 2026) / Hadano City “District Disaster Prevention Hazard Map” (Revised January, Reiwa 7) / Hadano City Central Urban Revitalization Basic Plan (Certified March 14, Reiwa 7) ※The names and locations of the districts are organized by our company based on the district names and town names listed in the city’s materials, and the boundaries are not strict.

Four Factors Unique to Hadano City That Damage Buildings

The contents of large-scale repairs vary depending on the location of the building. When investigating buildings in Hadano City, the following four factors are particularly important to check. I will discuss based on the overall trends in the city, but the actual conditions differ for each building, so please be sure to confirm on-site.

Source: Hadano City “Disaster Prevention Hazard Map by District” (Updated February 24, 2026) / Hadano City “Publication of Internal Flooding Assumed Area Map” (Updated August 27, 2026) / Hadano City Location Optimization Plan / Hadano City “Creation of Living Aesthetics Council and Landscape Law Notification” (Updated January 30, 2026)

Key points to consider when proceeding with construction in Hadano City

*Kakeru Koumuten has five locations including a showroom and material storage in Yokohama City, and we respond to consultations throughout Hadano City, including around Hadano Station, Shibusawa, Tsurumaki, Minami-Yana, Imaizumi, Nishi-Otake, and Horiyamashita.

Deterioration Symptoms and Timing Requiring Major Repairs

Generally, large-scale repairs are recommended every 12 to 15 years. According to a survey by the Ministry of Land, Infrastructure, Transport and Tourism, the actual repair cycle is most commonly 13 years, with about 70% falling within the 12 to 15 year range, and the cycle tends to shorten with each occurrence. However, the actual judgment should be based on the condition of deterioration rather than just the number of years, so if you notice symptoms like those listed below, we recommend an early on-site inspection.

Estimated Repair Cycles by Part (Ministry of Land, Infrastructure, Transport and Tourism Guidelines)

*The above are reference examples from the guidelines and are not uniform construction deadlines. Actual cycles will be set according to the specifications, location conditions, and deterioration status of the building.

Source: Ministry of Land, Infrastructure, Transport and Tourism “Guidelines for Creating Long-Term Repair Plans” (Reiwa 6 June Revision – PDF) / Ministry of Land, Infrastructure, Transport and Tourism “Survey on Large-Scale Renovation Work for Condominiums in FY2021”

Examples of Large-Scale Renovation Work

This is an example of exterior renovation work on a mixed-use building undertaken by Kakeru Koumuten. The building had leaks occurring in several places, and we combined clear waterproofing for the tile exterior wall with waterproofing for the roof for the renovation.

Exterior Renovation Work on a Mixed-Use Building (Tile Exterior Wall Waterproofing + Roof Waterproofing)

Customer Feedback

Flow from On-site Investigation to Completion of Construction

From inquiry to completion of construction and aftercare, a single representative will consistently handle your case. In the case of management associations, a resolution at the general meeting is necessary, so starting the process 1 to 1.5 years before the desired start date allows for a smoother progression.

1. Contact Us (Free) Please reach out via phone, form, or LINE. If you have estimates from other companies, it’s fine to just present those.
2. On-site Investigation & Building Diagnosis (Free) We will conduct a survey of the exterior walls, check for cracks, sealing, and waterproof layers, and if necessary, use drones or thermal imaging to investigate the roof, high places, and leak areas. For properties in Hadano City, we will also check for rust on iron parts, potential flooding, internal water, and landslide risks, as well as the condition of slopes and retaining walls, and confirm the delivery route and parking.
3. Submission of Investigation Report & Estimate We will provide a deterioration diagnosis report with photos and an estimate detailing quantities, methods, and materials for each work item. We can also propose multiple plans.
4. Plan Decision & Contract Confirm colors using color simulations, paint boards, and trial painting. For management associations, we can assist in preparing materials for general meetings. In areas subject to landscape plans, district plans, or building agreements, we will also explain the procedures and considerations for color choices.
5. Notification to Residents & Neighbors We will distribute construction notifications, conduct greetings to neighbors, and set up a bulletin board at the entrance (with a schedule and laundry information). If temporary relocation of parking is necessary, we will coordinate this at this stage.
6. Temporary Scaffold Installation & Various Works Our in-house scaffold team will set up the scaffolding, followed by high-pressure washing → substrate repair → sealing → exterior wall painting & tile repair → waterproofing → iron parts & ancillary work in that order. A supervisor will inspect each process and take construction photos.
7. Completion Inspection, Scaffold Dismantling & Handover We will confirm the finished work in the presence of the customer and provide construction photos, a report on the paint used, and a warranty certificate.
8. Aftercare Maintenance We will send out annual DM notifications, and inspections can be conducted every year. Simple repairs such as partial sealing are provided free of charge.

Resident Communication, Additional Work Approval, Inspection Reports

Equally important as the construction itself is “when, what, and with what materials we report”. At Kakeru Koumuten, we provide materials and reports in the following four scenarios.

* For management associations, it is smooth to decide in advance who will approve additional work (such as the chairman or repair committee) and the estimated amount that requires approval before the contract.

What Will Life Be Like During Construction? Impact on Residents

Large-scale repairs are principally carried out while residents remain in their homes. However, there will be restrictions on daily life while scaffolding is in place. Most troubles can be prevented by providing advance notice, so Kakeru Koumuten Co., Ltd. thoroughly explains and posts information before construction begins.

How to Choose a Large-Scale Repair Contractor and Ordering Method

There are many large-scale repair contractors that cover Hadano City, and you may be unsure which one to choose. When requesting renovations for apartments, condominiums, or buildings, please check the following four points.

Extensive Experience in Large-Scale Repairs

Large-scale repair contractors often have websites that showcase their exterior renovation achievements. If they provide detailed explanations of repair work with photos, it can give you peace of mind as a reference when you actually request their services.

Using ratings from Google and review sites can be effective when comparing large-scale renovation contractors! Be cautious if there are many negative reviews. If there are few reviews, also check the construction track record, the content of the explanations, and the management system.

Large-scale renovation work involves not only the construction itself but also the potential for troubles with residents and neighboring residents. Therefore, it is necessary to report the progress of the work and laundry information on bulletin boards to prevent issues before they arise. Kakeru Koumuten Co., Ltd. specializes in exterior work, and we receive many requests for exterior renovations of apartments and condominiums.

Check for warranties and aftercare services

When choosing a large-scale renovation company, make sure to check for warranties. If any issues such as leaks occur after the work is completed, having a leak warranty from the contractor means you can have it repaired at no cost, providing peace of mind! Companies that offer warranty periods are often confident in their work, which can serve as a criterion for selecting a contractor.

Warranty periods vary by contractor and type of work, but typically range from 1 to 10 years. Emergency repairs or partial repairs often do not come with a leak warranty. Some contractors also offer aftercare services separate from warranties, so be sure to check if there are warranties or aftercare services available.

Kakeru Koumuten Co., Ltd. sends out annual direct mail for aftercare maintenance, allowing for yearly inspections. We also provide simple repairs such as partial sealing at no charge.

Obtain estimates from multiple contractors (at least 3 companies)

When requesting large-scale renovations, be sure to obtain estimates from multiple contractors. It is important to get estimates from at least 3 companies and compare their estimates and reports! Even for the same work, costs can vary by contractor, and warranties and aftercare services may differ. Additionally, obtaining multiple estimates makes price negotiations easier.

When comparing estimates, consider not only the cost but also the “items in the estimate,” “methods and materials for substrate repairs and exterior wall painting,” and “confirmation of the process.” Carefully compare these details! If the quality of the auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid making decisions based solely on price. Especially since substrate repair work can be difficult to assess from appearance alone, ensure that the repair method is appropriate for the condition of the substrate!

Check these points on the estimate (checklist)

Check if it is managed in-house

Large-scale repair work includes various tasks such as “substrate repair work,” “exterior wall painting,” “waterproofing work,” and “pipe replacement,” and the plan content will change based on the actual deterioration state and customer preferences.

There are cases where contractors that completely outsource to subcontractors lack knowledge and experience, leading to proposals for repairs in irrelevant areas or meaningless work. If you request a subcontractor after investigation, it may incur additional time and costs. By managing in-house with knowledge and experience, responsible construction can be performed at a reduced cost.

Additionally, contractors that outsource completely may also respond slowly in the event of trouble during construction. It is safer to avoid having a company that has not directly consulted with the customer manage the construction. Kakeru Koumuten performs everything from temporary scaffolding setup to exterior wall painting and waterproofing work in-house, managed by knowledgeable and experienced personnel!

There are three ordering methods. The choice affects the approach.

Especially for management associations, it is necessary to decide “how to request” before deciding “which company to hire.” The main ordering methods are as follows:

Collusion and Inappropriate Consulting Issues in Large-Scale Renovations and Self-Defense Measures

Latest 2026 In the large-scale renovation industry, inappropriate orders linked between design consultants and construction companies have long been a problem. The Ministry of Land, Infrastructure, Transport and Tourism issued warnings and notifications to management associations in January 2017 and April 2023, and on September 28, 2026, the Japan Fair Trade Commission announced that it had issued exclusion orders to 38 companies and imposed a total of 1.63788 billion yen in surcharge payment orders on 37 companies regarding large-scale renovation work commissioned by condominium management associations in the Kanto region (two design consulting firms were also subject to exclusion orders).

※This content is based on the announcement by the Japan Fair Trade Commission (September 28, 2026).

Three Typical Methods

Source: Ministry of Land, Infrastructure, Transport and Tourism “On the Proper Ordering of Large-Scale Renovation Work for Condominiums” (Notification dated April 3, Reiwa 5, PDF)

Self-Defense Measures for Management Associations

• Obtain independent estimates from multiple companies
• Consult with neutral third parties such as condominium management professionals or architects
• Document the contractor selection process in meeting minutes to ensure transparency
• Confirm the reasons for abnormally low consulting fees
• Include a penalty clause in the contract for cases of collusion
• Avoid concentrating information with a single consultant and verify specifications independently

Frequently Asked Questions about Large-Scale Repairs in Hadano City

How much does large-scale repair in Hadano City cost?

For condominiums, according to the Ministry of Land, Infrastructure, Transport and Tourism’s survey for the fiscal year 2021, about 70% of cases fall within the range of 750,000 to 1,500,000 yen (excluding consumption tax and common temporary construction costs), with the most common range being 1,000,000 to 1,250,000 yen. Based on our company’s construction records, the cost for a two-story wooden apartment ranges from 2,000,000 to 4,000,000 yen, for a three-story steel or RC apartment from 4,000,000 to 9,000,000 yen, and for small-scale condominiums or mixed-use buildings from 5,000,000 to 15,000,000 yen. The costs vary depending on the condition of the substrate and whether waterproofing or roofing work is required, so we provide free on-site estimates.

How often should large-scale repairs be conducted?

Generally, a cycle of 12 to 15 years is recommended, and the actual cycle is most commonly 13 years according to the Ministry of Land, Infrastructure, Transport and Tourism’s survey, with about 70% falling within the 12 to 15-year range. However, the decision should be based on the condition of deterioration rather than just the number of years. If there are signs of deterioration in the sealing, lifting of tiles, or breakage of the waterproof layer, it is better to carry out repairs without waiting for the cycle, as this can ultimately reduce costs. For older buildings, the proportion of tile repairs and steel part replacements tends to increase in the second and third rounds of repairs.

How long does the construction period take? Can residents stay during the work?

For apartments, the construction period is typically 3 weeks to 2 months, for small-scale condominiums or buildings 1.5 to 3 months, and for condominiums with more than 50 units about 4 to 6 months. Residents can remain in their homes during the construction. However, while scaffolding is up, there may be restrictions on drying laundry outside and opening windows, so we take thorough measures to minimize the impact on daily life, including distributing advance notices, providing information on the schedule and laundry through bulletin boards, and strictly adhering to working hours.

How long should we expect from the start of planning to the completion of construction?

For management associations, it typically takes 1 to 1.5 years for the establishment of the repair committee, building diagnosis, contractor selection, and general meeting resolutions, followed by 3 to 6 months for construction. Overall, it is advisable to plan for about 2 years to proceed comfortably. If you are utilizing subsidies or tax incentives, please also factor in the time required to obtain management plan certification (pre-confirmation and application to the city).

Are there any subsidies available for large-scale repairs in Hadano City?

According to the list of subsidies and grants on Hadano City’s official website, there were no subsidies specifically for large-scale repair work on condominiums (Kanagawa Prefecture also does not provide subsidies for the work itself). However, for owner-occupied condominiums, if certain conditions are met, a reduction in fixed property tax can be applied under the “Condominium Longevity Promotion Tax System” (the reduction rate varies by city). Additionally, there is city support for seismic diagnosis and seismic retrofitting plans for condominiums built to old seismic standards, a city management plan certification system, and free dispatch of advisors for owner-occupied condominiums in Kanagawa Prefecture (applications accepted until February 26, 2027). The city’s zero-carbon living creation subsidy for fiscal year 2026 has already closed for applications, but if the work includes windows and insulation, it may be eligible for the national programs “Advanced Window Renovation 2026” and “Future Eco Housing 2026.” The application timing and applicants vary by program, so please check the eligibility conditions and application procedures for each program before contracting and starting work.

I heard that fixed property tax can be reduced with large-scale repairs. Is that true?

It is true if certain conditions are met. Under the Condominium Longevity Promotion Tax System, if a condominium that meets the requirements (such as being over 20 years old and having more than 10 units) conducts large-scale repairs that contribute to longevity (such as exterior painting, floor waterproofing, and roof waterproofing), the fixed property tax amount for the following year will be reduced. The reduction rate is determined by the city based on the reference standards set by the national government, and it was not possible to confirm the rate and declaration destination on Hadano City’s official website, so please check with the city’s property tax division (0463-82-7391). The national program applies to work completed between April 1, 2023, and March 31, 2027, and declarations must be made within three months after completion. For certified management plan condominiums, there are also requirements such as raising the repair reserve fund, which takes time to prepare, so it is recommended to start the process more than a year before construction.

Are there any changes to subsidies starting from fiscal year 2026?

There is a risk of collusion in large-scale repairs. It is essential to be vigilant about the bidding process and the behavior of contractors. Look for signs such as unusually similar pricing among bids, lack of transparency in the bidding process, or contractors who seem to have a prior agreement. Engaging an independent consultant or expert can also help ensure a fair and competitive bidding process. Always request detailed breakdowns of costs and specifications to compare offers effectively. If you suspect collusion, it is advisable to report it to the relevant authorities for investigation.

There are three typical methods. ① Deciding on a contractor in advance and having other companies provide only formal high estimates, known as “dummy estimates.” ② Consultants contract at extremely low design management fees and receive kickbacks from partner companies, leading to collusion. ③ Adding a portion of the contract amount as a back margin to the construction costs. The countermeasures are to obtain independent estimates, consult a neutral third party, keep minutes of the selection process, and include a penalty clause in the contract.

How many companies should I get estimates from?

We recommend at least three companies. If there are too many, it becomes difficult to compare, and if there are too few, competition does not occur. What is important is not the number of companies but to “create the same playing field before comparing.” By creating a common specification sheet and quantity table and requesting estimates under the same conditions, and by requiring detailed breakdowns instead of a lump sum notation, it becomes clear whether the price differences are due to variations in scope or unit prices.

What is the difference if you have your own scaffolding?

In large-scale repair construction, temporary construction accounts for about 20% of the total cost (according to the Ministry of Land, Infrastructure, Transport and Tourism’s FY2021 survey). By not outsourcing scaffolding work, it is easier to control costs in this area, and our in-house scaffolding team can respond flexibly to sudden changes in the schedule or additional work. Kakeru Koumuten Co., Ltd. owns scaffolding materials for about 100 single-family homes and plans according to the site, even in areas with slopes or height differences.

I’m in the middle of getting estimates, but can I just have my estimate reviewed?

Of course, that’s possible. If you bring in estimates from other companies, we will check for free whether the items, quantities, methods, and materials are appropriate and provide you with an estimate under the same conditions. We welcome competitive estimates.

Can I request just emergency repairs for a leak?

Yes. As a preliminary step before large-scale repairs, we also accept requests for emergency repairs or partial repairs for leaks. We will identify the cause using thermal imaging or drones and propose the minimum necessary repairs.

Can you handle roofing or exterior wall materials that contain asbestos?

Yes, we can. We have qualified personnel, including asbestos work supervisors and building material surveyors, who can handle everything from the legally required preliminary surveys to cover methods and removal of asbestos-containing roofing materials. If there is sprayed asbestos, we will also guide you on the investigation and removal process, as well as the legal procedures involved.

What happens if large-scale repairs are not done?

There are risks such as personal injury from falling exterior wall tiles, structural deterioration due to corrosion of rebar, leaks, and a decrease in asset value. Furthermore, for buildings subject to regular reporting under Article 12 of the Building Standards Act, investigations through comprehensive probing are required under certain conditions, such as if more than ten years have passed since completion or exterior wall renovations for tiles or mortar finishes. Hadano City handles regular reports as a designated administrative agency, and it is necessary to confirm with the city’s Building Guidance Division whether general apartments and condominiums are included in the applicable uses and scales. Even if not subject to statutory investigations, regular inspections and maintenance are essential, so please consult us if you are unsure about your judgment.

How much does large-scale repair for an apartment (about 10 units) cost?

For a two-story wooden building with 6 to 10 units, it is estimated to be between 2 million and 4 million yen, and for a three-story steel or RC building with 10 to 20 units, it is estimated to be between 4 million and 9 million yen based on our company’s track record (including scaffolding, substrate repairs, exterior wall painting, sealing, and waterproofing). It is common for apartments to undergo repairs every 10 to 15 years. For owners, there is an increasing trend to change the exterior appearance through color simulations during repairs to improve occupancy rates.

If you are looking for large-scale repair contractors in Hadano City, contact Kakeru Koumuten

Our company has handled many exterior wall renovations and large-scale repairs for condominiums and apartments in Hadano City. We are happy to assist not only with large-scale repair work but also with partial repairs and leak repairs. “I want it to last a long time with one renovation,” “I want to keep costs down as much as possible,” “I want to improve insulation performance because the indoors are hot”—we will propose the best solutions for your specific requests and future repair plans.

From temporary scaffolding work to roofing and exterior wall painting, all work is performed by our own team. We are confident that we will not be outdone by others in terms of cost, quality, and organization, so we welcome competitive estimates!

Service Area for Large-Scale Repair Work

Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and the entirety of Tokyo.

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