Kakeru Koumuten Co., Ltd. is a local renovation company based in Aoba-ku, Yokohama, with a headquarters and showroom.
While we specialize in exterior renovations, we also handle interior renovations such as bathrooms, kitchens, toilets, washbasins, wallpaper, flooring, layout changes, air conditioning, and water heaters in-house. Areas like Tamaplaza, Azamino, Aobadai, Ichigao, Fujigaoka, Utsukushigaoka, and Susukino are all considered “neighbors.”

On this page, we will honestly explain the costs and timelines for each construction menu, as well as subsidies available as of August 2026, taking into account the unique renovation circumstances of Aoba-ku.

Four Reasons Why Interior Renovations Are Increasing in Aoba-ku, Yokohama

Aoba-ku is a city that was developed all at once as a “Tama Garden City” following the opening of the Tokyu Den-en-toshi Line in 1966. The green coverage rate in the district is 28.8%, the highest among Yokohama’s 18 wards, characterized by hilly terrain, often referred to as “Hills of Yokohama.”
This background directly contributes to the current demand for renovations.

Start with a free on-site survey. We can visit Aoba-ku right away.

Interior Renovation Services Offered by Kakeru Koumuten

We handle everything from single area renovations like “just the bathroom” or “just the toilet” to complete renovations including layout changes.
The costs and timelines provided are general estimates for typical houses and apartments.

Reasons Why Kakeru Koumuten is Chosen for Interior Renovations in Aoba-ku, Yokohama

1Both the headquarters and showroom are located in Aoba-ku

The headquarters and showroom of Kakeru Koumuten are located in Aoba-ku, Yokohama. We have established five bases within Yokohama for material storage and showrooms.

“We can respond quickly to your request to ‘come take a look'” — this is the greatest value of a local company, in my opinion.
Whether it’s a sudden inquiry during construction or a concern after completion, we can visit you in Aoba-ku in a short time.

At our showroom, you can directly check the actual building materials and colors, allowing you to choose the texture of flooring and wallpaper that can’t be decided just from a catalog.

▶ Information on Kakeru Koumuten Co., Ltd. showroom and material storage in Aoba-ku, Yokohama

2Complete in-house construction. One point of contact from start to finish

From inquiry to completion, everything is handled by Kakeru Koumuten in a consistent manner. Since there are no intermediary margins, we can keep costs down while maintaining the same quality.

Moreover, a surprisingly significant aspect of interior renovations is “having the same person in charge throughout.”
In companies where the sales representative, site supervisor, and craftsmen change, it’s common for “what was supposed to be communicated” to get lost. At our company, one representative will handle everything from the estimate to the completion of the work, ensuring that your detailed preferences for color selection are communicated directly to the site.

3You can request both interior and exterior work together

As a specialist in exterior renovations, our company has handled numerous projects including exterior wall painting, roof work, and leak repairs.
Therefore, we can seamlessly handle inquiries like “While replacing the bathroom, I’m also concerned about the exterior wall…” all with one company.

In cases where stains appear on the interior wallpaper due to leaks, just fixing the interior will lead to recurrence. Being able to determine whether the cause is outside or inside is a strength of an exterior specialist handling interior work.

▶ [Aoba-ku] For roof repairs, exterior wall painting, and rain gutter repairs
▶ [Aoba-ku] For repairs and renovations of apartments and condominiums

4Acquisition of various permits and presence of national qualified personnel

We have obtained a construction industry license and a license for industrial waste collection and transportation.
In interior renovations, demolition will inevitably produce waste materials. Being able to sort and transport waste in-house leads directly to cost savings on disposal fees.

We also have nationally certified sheet metal workers and painting specialists on staff, enabling us to handle large-scale projects such as factories and apartment complexes.

5Guarantees and Aftercare

Our equipment comes with a manufacturer’s warranty, and in addition, we provide our own construction warranty.
Aftercare is available every year, and we send out annual notification DM.
For small requests like “I just want to fix this part,” please feel free to reach out to us, especially since we are local.

6No Upfront or Interim Payments

We offer three payment methods: bank transfer, collection, and renovation loan.
Our company does not require advance payments or interim payments; payment is made after the completion of the work.

A common issue in renovations is “the work isn’t progressing even though I’ve paid an advance.” With our post-completion payment system, you can confirm the finished work before making any payment, eliminating that concern.

7Clear estimates and documentation

We do not provide estimates that only state “one set.”
In addition to a detailed estimate that specifies which materials, what grades, and how many will be used, we also provide a “investigation report,” “guidebook,” and “comparison table for each product.”

The comparison table is categorized by grade, allowing you to easily compare total costs and performance at a glance. This material is for you to consider alongside estimates from other companies.

8We are also focused on human resource development

We create various models to improve skills and conduct practical training.
Renovation methods and materials vary depending on the existing materials and shapes. To ensure that any staff member can provide the same quality of service, we conduct regular technical training.

▶ Click here for Kakeru Koumuten Co., Ltd. company overview

9We gladly accept small projects

“Just one sink,” “only the toilet,” “just the wallpaper in a 6-tatami room”—we believe that small projects are where local companies shine.

Large renovation companies may decline due to cost issues or pass the work to subcontractors, resulting in higher prices. Since we operate within Aoba-ku, Yokohama, we can handle small-scale projects at fair prices without incurring travel costs.

We are confident in both our costs and quality, so we welcome competitive estimates.
Estimates are completely free. If you find our company lacking compared to others, feel free to decline without hesitation.

Cost Estimates and Timeframes for Interior Renovations in Aoba-ku, Yokohama

The cost of interior renovations varies significantly based on “which products you choose.” Even for the same “bathroom renovation,” the price can differ by more than double depending on the grade.
The table below provides general estimates for typical houses and apartments. Actual costs will be presented in an estimate after an on-site survey.

* This is a general guideline that includes the costs for the removal and disposal of existing equipment, protective measures, and various expenses.
* In Aoba-ku, many homes are over 40 years old, and there may be cases where repairs to the underlying structure are necessary after demolition. Our company will inform you of the possibility at the time of inspection, and if additional costs arise, we will always explain and obtain your consent before proceeding.

▶ Click here for the list of construction menu and price table

Subsidies and Grants Available for Interior Renovations in Aoba-ku, Yokohama【Latest as of August 2026】

Yokohama City FY 2026 Existing Housing Insulation Renovation Subsidy Program

This is a Yokohama City-specific subsidy program available when renovating existing single-family homes to high insulation performance energy-efficient homes. The focus will be on interior construction such as internal windows and insulation materials.

* This program requires applications by registered businesses. Please contact us for eligibility and procedures. Be sure to check the official city page for detailed requirements.

Yokohama City Wooden House Earthquake Resistance Renovation Subsidy Program (Perfect Compatibility with Floor Plan Changes)

If you are considering “removing walls to expand the LDK,” there is a possibility that you can use subsidies if you consider earthquake resistance renovation as a package. Since any work involving walls will require interior demolition anyway, doing it simultaneously is overwhelmingly efficient.

Long-term Care Insurance Housing Renovation Cost Subsidy (Up to 200,000 yen)

Aoba-ku has the fourth highest aging rate in the city. Households with certified support or care needs should first check this system.

Yokohama City Housing Environment Improvement Subsidy (For Those with Disability Certificates)

This is a system that provides subsidies for home modifications to assist individuals with physical disabilities holding a Grade 1 or 2 Disability Certificate in their daily living activities (the maximum subsidy for home modifications is 1.2 million yen, with a co-payment based on income).
Eligible construction includes the installation of handrails, elimination of steps, changes to flooring materials, and replacement of doors. Construction covered by long-term care insurance will take precedence. Due to the detailed requirements, please consult the Aoba-ku Welfare Health Center first.
Contact: Yokohama City Disability Independence Support Division TEL: 045-671-3891

Kanagawa Prefecture FY 2026 Existing Housing Energy Conservation Renovation Subsidy

This is a subsidy for insulation renovations of existing homes within the prefecture. Renovation of windows (including entrance doors, etc.) is mandatory, and the subsidy amount is either 1/3 of the eligible expenses or 150,000 yen, whichever is lower.
As of August 2026, additional applications will reopen from 8:30 AM on September 7 and will be accepted until September 30. However, the number of applications that can be accepted on a first-come, first-served basis is approximately 25, so if you are considering applying, please do so early.
Contact: Kanagawa Prefecture Decarbonization Strategy Headquarters Subsidy Examination Office TEL: 050-1784-5835

National Mirai Eco Housing 2026 Project (Housing Energy Conservation 2026 Campaign)

This is the most user-friendly national system for interior renovations. It is a condition to include either insulation renovation of openings, insulation renovation of the structure, or eco-friendly housing equipment, and the subsidy amount can be increased by combining it with other construction.

*The subsidy limit per unit is generally between 400,000 and 1,000,000 yen (varies based on the construction content and the year of construction of the house). Subsidy amounts under 50,000 yen per application cannot be applied for. The application system is set up for registered contractors, and direct applications by homeowners are not allowed. The program will end once the budget limit is reached.

National Water Heating Energy Conservation 2026 Project (Water Heater Replacement)

Additionally, as a removal addition, there will be an extra 40,000 yen per unit for the removal of electric thermal storage heaters (up to 2 units), and 20,000 yen per unit for the removal of electric water heaters.
The application period is from March 31, 2026, to December 31, 2026, but will end immediately once the budget limit is reached. For single-family homes, a maximum of 2 units per house is allowed.

National Advanced Window Renovation 2026 Project (Interior Windows & Window Replacement)

By installing interior windows or replacing windows, you can receive up to 1,000,000 yen per house. This is the program with the largest subsidy amount among insulation renovations.
Homes in Aoba-ku that are around 40 years old often have aluminum sashes and single-pane glass, which can cause severe cold and condensation in winter. If you see mold behind the wallpaper, consider checking the windows first.
The application period is from March 31, 2026, to December 31, 2026, and will end once the budget limit is reached.

Tax Reduction Reduction of Fixed Asset Tax for Barrier-Free Renovation Work (Yokohama City)

Flow from Inquiry to Completion

1. Contact UsYou can reach us by phone, email form, or LINE. It’s fine to say “just the bathroom” or “I just want to know the market price” as well.
2. On-Site Survey (Free)We will visit your home. Confirming the delivery route, the condition of the base, and the position of the plumbing is particularly important in Aoba-ku. For apartments, we will also check the management regulations. The time required is about 30 minutes to 1 hour.
3. Estimate & ProposalIn addition to a detailed estimate, we will provide a survey report and a product comparison table. If there are any subsidies available, we will explain them at this stage. This part is completely free.
4. Contract & Subsidy ApplicationIf you are satisfied with the content, we will proceed with the contract. Subsidies will be applied for before construction starts. We do not require any advance or interim payments.
5. Neighborhood Greetings Before ConstructionWe will visit the neighbors in the area that may be inconvenienced by construction vehicles or deliveries to greet them in advance.
6. ConstructionOur own craftsmen will carry out the work. We will report on the daily work and the schedule for the next day. Even during construction while living in the home, we will arrange to minimize the period when water facilities cannot be used.
7. Completion & PaymentWe will check the finished work together with the customer, and any concerns will be addressed on the spot. Payment will be made after your confirmation.
8. Aftercare MaintenanceWe will provide you with a warranty certificate, and thereafter, we will notify you annually via DM. Feel free to contact us for inspections or minor adjustments.

Customer Testimonials

Interior Renovation Case Studies in Aoba-ku, Yokohama

We have handled numerous interior renovations in Aoba-ku and throughout Yokohama.
We regularly introduce the latest construction activities and customer case studies on our staff blog and construction menu pages.

How to Choose an Interior Renovation Contractor in Aoba-ku

There are many renovation companies that serve Aoba-ku, and you may be unsure of whom to hire.
To avoid mistakes in interior renovations, please check the following five points.

Are they providing a price without a site survey?

Flyers advertising “XX million yen flat” may seem attractive, but interior renovations involve many aspects that can only be understood by opening up the space.
Especially in areas like Aoba-ku, where there are many older homes, prices given without seeing the site almost always increase later.
On the other hand, if a contractor thoroughly checks the crawl space, behind walls, and delivery routes, you can trust their estimate.

Is the estimate detailed with product names and quantities, rather than just “one set”?

“Bathroom renovation one set 1.2 million yen” — this doesn’t help you understand what to compare it to.

You should check if the manufacturer name, model number, size, grade, and quantity are listed, as well as whether demolition costs, disposal fees, protective measures, and miscellaneous expenses are itemized separately.
Even with the same “1.2 million yen,” if the grade of the materials differs by one level, the actual price can change significantly. Estimates that cannot be compared may be those that the contractor does not want you to compare.

Is the work done by their own team or subcontracted out?

There are many companies that only handle sales and subcontract the actual work to other contractors. In this case, an intermediary margin is added, and there is a risk that the details discussed do not get accurately communicated to the site.

Additionally, responses to issues that arise after the work is often delayed. Be sure to confirm “who will come to help” and “who to contact in case of issues” before signing the contract.

Are they explaining the subsidies available?

This is where the biggest differences can be found.
Subsidies for insulation renovations in Yokohama City, home modifications under nursing care insurance, and various national programs almost all require “pre-construction applications”. If a contractor rushes you into signing a contract and starts work early, you could lose out on tens of thousands of yen that you could have used.

Pay attention to whether they clearly state at the proposal stage, “This work qualifies for this program / does not qualify.” Contractors who can honestly say “it does not qualify” are more trustworthy.

Are they not requesting an advance payment, and are the warranty and aftercare details clear?

Be cautious if they ask for the full amount or a large portion of the construction cost before starting work.
Also, the manufacturer’s warranty for equipment and the contractor’s construction warranty are separate. It’s reassuring to confirm “who will fix it under which warranty in case of a water leak” before signing the contract.

Kakeru Koumuten Co., Ltd. does not require advance or interim payments, and payment is made after the completion of the work. We also provide a warranty certificate and conduct annual aftercare maintenance visits.

▶ About Kakeru Koumuten’s warranty and aftercare maintenance

Frequently Asked Questions about Interior Renovations in Aoba-ku, Yokohama

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For interior renovations in Aoba-ku, Yokohama, trust Kakeru Koumuten Co., Ltd.!

Our company is based in Aoba-ku, Yokohama, with a showroom, and we are a renovation company that handles everything in-house from exterior to interior renovations.

From water-related areas such as bathrooms, kitchens, toilets, and sinks, to wallpaper and flooring replacement, layout changes, and replacement of air conditioners and water heaters. For those small jobs that make you wonder, “Can I request this?” please reach out to your local company.

“I want to live comfortably for a long time with one renovation,” “I want to keep costs down as much as possible,” “I want to make the water areas easier to use since I’m living with my parents” — we will propose the best solutions for your specific requests.
We will never suggest unnecessary work that prioritizes profit. We always stand in our customers’ shoes and propose the optimal construction plan.

*The information on subsidies, grants, and tax reduction systems listed on this page is as of August 2026. The content, budget, and application periods of these systems may change annually, and applications may close once the budget limit is reached. Please be sure to check the official websites of each system or contact us for inquiries.