WATERPROOFING    RENOVATION    WATERPROOFING    RENOVATION   
Osaka & Tokyo — Waterproofing & Renovation

Protecting buildings means
protecting the lives within.

Waterproofing & Renovation Specialist Since 2013

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For General Contractors & Construction Companies

1,000+ completed projects.
A specialist contractor you can count on.

Qualified specialists across waterproofing, exterior repair, and major renovation — ready to support your projects.

Subcontracting Inquiry →
01
Services

What We Do

Our Services

01
Major Renovation
Major Renovation Works

Comprehensive renovation for condominiums, office buildings, and public facilities — all in one contract.

02
Waterproofing
Waterproofing Works

Urethane, sheet, FRP — the optimal method for every structure. Rooftops, balconies, corridors, and parking decks.

03
Exterior Repair
Exterior Wall Repair

Crack repair, tile restoration, coating, and caulking — managed from scaffolding to final inspection.

04
Interior Works
Interior Construction

Common area and room renewal to facility upgrades. Simultaneous with exterior work to minimize scaffolding and duration.

02
For Contractors

Your specialist subcontractor.

01
Schedule Adherence

Flexible site response aligned to your schedule — our multi-office structure handles changes and additions without delay.

02
Quality Documentation

Complete documentation including site photos and quality checklists — ensuring smooth handover every time.

03
Multi-Trade Capability

Waterproofing, exterior, and interior — one point of contact for simpler schedule and quality management.

ゼネコン・建設会社との打ち合わせ
03
For Property Owners

Protecting your property's value.

For Property Owners & Investors

Missed repair timing accelerates asset value decline. K.B.K supports you from site inspection through construction and follow-up as your specialist renovation partner.

Free
Site Survey & Estimate

Site visit and estimate — completely free.

Osaka & Tokyo
Two-Office Structure

Serving Kansai & Kanto from two locations.

1,000+
Projects Completed

1,000+ completions, public & private.

Licensed Specialists
Qualifications

Grade 1 Construction, Waterproofing & various specialists.

施工対象建物
04
Works

Project Record

Selected Works

1,000+
Projects Completed
Government & Municipality / UR & Public Housing / Hospitals, Schools / Private Developers
Major Renovation
Major Renovation
100+
Waterproofing
Waterproofing
600+
Exterior Repair
Exterior Repair
200+
Public Works
Public & Government
100+
05
Our Process

How We Work

5 Steps to Completion

01
Inquiry

Reach us by phone, email, or contact form.

02
Site Survey

A qualified specialist visits the site to assess the building's condition.

03
Estimate & Proposal

We present a detailed estimate with method, timeline, and cost — clearly explained.

04
Construction

Qualified specialists execute to quality standards with regular progress updates.

05
Completion & Support

After final inspection and handover, we support you long-term.

06
Qualifications & License

Quality assured
by qualified specialists.

Qualifications & License
Grade 1 Construction Management Engineer
Grade 1 Waterproofing Technician
Various Grade 1 Specialists
Osaka Gov. License (General-7) No.152049
Public Sector Track Record
Government & Municipal Projects
UR & Public Housing Renovation
Hospitals, Schools & Public Facilities
Major Private Developer Projects
Our Approach
Each field of work is handled by qualified specialists in that discipline
Two offices — Osaka and Tokyo — covering Kansai and Kanto regions
Mission & Vision
Uphold building durability and safety through genuine skill and an honest approach.
As waterproofing and renovation specialists, expanding from Kansai and Kanto to serve all of Japan.
07
Reviews

From Our Clients

* To improve our services, we may distribute post-construction surveys. All reviews are anonymized to protect personal information and based on survey responses.

Mr. T, Condominium Owner, Osaka
Major Renovation
★★★★★

The site survey was thorough and clear about what needed fixing. Regular photo updates during construction let me manage remotely with confidence. The result exceeded expectations.

Osaka / RC Condominium
Mr. K, Site Manager, Construction Co.
Waterproofing — Subcontract
★★★★★

I needed a subcontractor who sticks to the schedule. Even after a sudden design change, they adapted flexibly — finishing 2 days ahead of plan. Documentation was impeccable.

Osaka Pref. / Exterior Waterproofing
Ms. M, Real Estate Investor
Rooftop Waterproofing
★★★★☆

Clearest itemized quote among competitors, and no surprise costs later. The leak is completely gone and tenant complaints have stopped.

Osaka / RC Building Rooftop
Mr. N, HOA President
Major Renovation
★★★★★

Our HOA's first major renovation. They helped prepare materials for the residents' meeting. Thoughtful neighbor relations throughout — zero complaints.

Suita / Condominium
Mr. Y, Homeowner
Exterior Coating & Caulking
★★★★★

Three years on, no uneven color and the walls still look great. I chose them for the quality of explanation, not just price. I plan to use them again.

Toyonaka / Detached House
Ms. S, Facility Manager
Waterproofing & Exterior, Public Facility
★★★★★

Safety management and documentation accuracy exceeded our standards for a public facility. We plan to consult them again for next year's plan.

Osaka / Public Facility
Mr. H, Procurement, General Contractor
Waterproofing — Repeat Orders
★★★★★

Consistent quality across multiple sites and a genuinely cooperative attitude toward last-minute requests. We want this to be a long-term partnership.

Multiple Sites, Kansai Region
Mr. O, Commercial Building Owner
Balcony & Rooftop Waterproofing
★★★★☆

With tenants in place we had strict noise restrictions — all honored. Business continued without disruption, and the tenants were pleased.

Kita-ku / Commercial Building
Ms. R, Real Estate Company
Pre-renovation Treatment
★★★★★

Pre-sale substrate and waterproofing work on a tight deadline — quality wasn't compromised. The buyer's inspection passed without issue.

Sakai / Pre-owned Condominium
Mr. I, Building Owner, Tokyo
Exterior & Waterproofing Renovation
★★★★★

I reached out after learning about their Tokyo office. The team was attentive and thorough. Their track record in the metro area is genuinely reassuring.

Shinagawa / Office Building
0
Projects completed
2013
Founded
09
Growth Data

Steady Growth

* Reference values only. Project count reflects work completed since incorporation in 2019.

Annual Project Count
Projects / Total 1,000 — Reference
Revenue by Service Type
Latest Year / Reference
10
Careers

Build the future with us.

Career Opportunities

11
Our Offices

Osaka & Tokyo

Head Office
Osaka HQ
6-1-44 Nishiawaji, Higashiyodogawa-ku, Osaka 533-0031
TEL: 06-6326-6222
FAX: 06-6326-6223
11 min walk from JR Higashi-Yodogawa Sta.
Tokyo Office
Tokyo Branch
1-9-7 Kitashinagawa, Shinagawa-ku, Tokyo 140-0001
TEL: 06-6326-6222
Accessible from JR Shinagawa Station
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