What 株式会社ティーエスケー does

株式会社ティーエスケー (TSK Co., Ltd.) is a privately held Japanese construction firm specializing in large-scale renovation of apartment and condominium buildings, headquartered in Chiba with a secondary Tokyo headquarters and branch offices in Kanagawa and Saitama. Founded in 1945 in Funabashi as a painting contractor (竹内塗装) and operating under the current name since a 2008 rebranding, the firm pivoted from general painting into comprehensive apartment complex renewal services including foundation repair (下地補修), waterproofing (防水工事), painting (塗装工事), and seismic reinforcement (耐震補強工事). Its primary customers are apartment management associations (マンション管理組合) in the Kanto region, acquired through direct field sales with dedicated project managers, supported by a dedicated showroom at Makuhari Techno Garden for consultations.

Revenue is generated on a project-by-project, quote-based model with multi-year contract cadence, yielding ¥10,605,570,000 in annual sales for the fiscal year ending April 2026 against a headcount of 166. The firm holds ISO 9001 (since 2002) and ISO 14001 (since 2010) certifications covering painting, waterproofing, and foundation repair, and in April 2025 obtained Business Continuity Planning (BCP) certification. It has been ranked third nationally in apartment renovation project volume by the マンション計画修繕施工協会 (MKS) and was designated a Regional Future-Driving Enterprise by Japan's Ministry of Economy, Trade and Industry in 2018.

Ownership has remained within the Takeuchi family across four generations; May 2025 brought the first non-family president, Takeshi Niikura (新倉武志), following the death of former president Hajime Takeuchi. In June 2026 the company acknowledged an administrative disposition from the Japan Fair Trade Commission, the nature and severity of which is not disclosed in the source materials. The company has no public stock listing, no disclosed external funding, and no AI/digital technology components in its service offering.

Name

株式会社ティーエスケー

Legal name

株式会社ティーエスケー

Website

https://kk-tsk.co.jp

Company type

Private

Founded year

1945

Operating status

Operating

Headcount range

1–10 employees

Short description

株式会社ティーエスケー (TSK) is a privately held Japanese construction firm founded in 1945, specializing in large-scale renovation of apartment buildings — foundation repair, waterproofing, painting, and seismic reinforcement — for management associations across the Kanto region.

Ownership category

akta.pro rank

Headquarters

HQ city

Chiba

HQ country

Japan

HQ region

Asia

Offices6 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Infrastructure, Marketing or Sales, Technology or R&D

Revenue model

1. Construction Renovation Services: Project-based revenue from large-scale apartment renovation and repair construction services including exterior/interior renovation, waterproofing, painting, and seismic reinforcement. Revenue is generated through one-time project fees based on contracted construction work.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

TSK is a Japanese construction general contractor specializing in large-scale renovation and repair of apartment and condominium buildings. Its core offering encompasses comprehensive renewal services (マンション総合リニューアル) that include foundation/body repair, waterproofing, painting, and seismic reinforcement, delivered as turnkey construction projects to apartment management associations and property owners across the Kanto region.

Product overview

株式会社ティーエスケー is a specialized construction company offering comprehensive apartment complex renewal services centered around large-scale renovation construction (大規模修繕工事). The core product is the マンション総合リニューアル (Apartment Complex Comprehensive Renewal), which encompasses the 大規模修繕工事 (Large-scale Renovation Construction) as the main service. This is supported by specialized construction method modules (工法紹介) covering foundation repair, painting, waterproofing, and seismic reinforcement, along with アフターメンテ age maintenance services (アフターメンテナンス) providing ongoing warranty and inspection support. The company operates a dedicated showroom (ショールーム) at Makuhari Techno Garden to showcase their renovation capabilities. The company serves the Greater Tokyo area with multiple branch offices in Chiba, Tokyo, Kanagawa, and Saitama.

Differentiator

Problem solved

Functional benefit

Products and services

• Apartment Complex Comprehensive Renewal (マンション総合リニューアル) Comprehensive one-stop renewal service for apartment complexes, including large-scale renovation construction, exterior and interior repairs, and optional renovation works. Designed for apartment management associations and residential building owners seeking to maintain and enhance property value.
• Large-Scale Renovation Construction (大規模修繕工事) Large-scale renovation construction for apartment buildings, covering common facility repairs, repainting, waterproofing, and seismic reinforcement. Offered as a turnkey project to apartment management associations and building owners.
• Specialized Construction Methods (下地補修・防水・塗装・耐震補強) Specialized construction method offerings including foundation/body repair (下地補修), waterproofing (防水), painting (塗装), and seismic reinforcement (耐震補強). Each is delivered as a domain-specialized construction capability for apartment buildings.
• After-Maintenance Service (アフターメンテナンス) Post-construction maintenance services including construction warranties and regular inspections for completed apartment renovation projects. Targeted at existing clients who have completed renewal works with TSK.

Named customers2 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Four partnerships are on record, tiered minor and core.

• 船橋市minorOthers · 3 September 2025Donated 5,000,000 yen to Funabashi City for youth healthy development programs in memory of former President Takeuchi Hajime.
• 豊友会 (Toyotomikai)coreImplementation/ SI/ Consulting Partner · 1 October 2024Safety and health cooperative association of partner construction companies working with TSK. Collaborates on safety大会 (safety conferences), volunteer activities, and project execution. Approximately 20 companies and 97 employees participate in joint activities.
• 南極観測船「しらせ」関係機関minorOthers · 7 October 2019Collaborative volunteer painting activities for the Antarctic research vessel Shirase at Funabashi Port. TSK employees participate in painting volunteer work to contribute to community and national scientific efforts.
• 日本赤十字社minorOthersDonated relief funds through Funabashi City Hall for Noto Peninsula Earthquake recovery efforts.

Scale indicators7 records

Recent moves9 records

Expansion highlights5 records

Direct peers

• 東急コミュニティー (Tokyu Community): Apartment management and renovation company under Tokyu group; delivers 大規模修繕工事, including painting, waterproofing, and seismic work, to management associations in urban Japan — direct overlap with TSK's service lines.
• 長谷工コーポレーション (Haseko Corporation): Japan's largest condominium renovation general contractor; directly competes with TSK on 大規模修繕工事 for management associations across the Kanto region, with materially larger scale and broader specialty trade coverage.
• 穴吹コミュニティ (Anabuki Community): Specialized apartment management and large-scale renovation contractor serving condominium associations nationwide; comparable GTM (project-based bids to 管理組合) and service scope (防水, 塗装, 耐震) to TSK.
• 日本建物保全 (Nihon Tatemono Hozen): Tokyo-based specialist in apartment building maintenance and 大規模修繕工事; very similar mid-size profile to TSK, working with management associations in metropolitan Japan.
• 三菱地所コミュニティ (Mitsubishi Jisho Community): Condominium management company operating under the Mitsubishi group; provides large-scale repair construction (大規模修繕工事) and supports the same management-association customer base as TSK.
• 大京アステージ (Daikyo Astage): Daikyo Group's condominium management and renovation subsidiary; one of the largest scale 大規模修繕 contractors in Japan and directly comparable to TSK's condo-association-targeted renovation model.

Broad incumbents

• 野村不動産パートナーズ (Nomura Real Estate Partners): Building management and renovation subsidiary of Nomura Real Estate; broader portfolio across property management, leasing, and renovation, with significant condo-association renovation work that competes with TSK in the Kanto market.
• 住友不動産建物サービス (Sumitomo Realty & Building Service): Comprehensive building management arm of Sumitomo Realty; offers renovation, repair, and maintenance services to condominium associations as part of a wider real-estate platform — comparable end customer but broader scope than TSK.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/%E6%A0%AA%E5%BC%8F%E4%BC%9A%E7%A4%BE%E3%83%86%E3%82%A3%E3%83%BC%E3%82%A8%E3%82%B9%E3%82%B1%E3%83%BC

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about 株式会社ティーエスケー