S-Build

What S-Build does

S-Build Co., Ltd. (株式会社エス・ビルド) is a privately held Japanese construction company founded in June 2003 by CEO Sawaguchi Kiichi, headquartered in Osaka with a second headquarters in Tokyo established in October 2025. The company specializes in office interior construction, executing fit-out, renovation, and restoration projects for corporate clients across Japan, with FY2024 revenue of ¥2.86 billion and a workforce of approximately 97 employees including part-time staff. It operates three business segments: (1) Office Interior Construction — comprehensive single-source contracting covering partitioning, drywall, finishing, carpentry, electrical, HVAC, signage, and fire prevention work, processing 2,000+ projects annually with a cumulative track record exceeding 10,000 projects and a reported 90%+ client repeat rate; (2) Architectural Software — the proprietary Kenken no Denki (建築の電卓) interior material quantity surveying tool, which reduces estimation time by up to 75% and material waste by 50%, sold to 300+ construction firms and material manufacturers; and (3) Material Sign Products — PVC-based patches, magnets, keychains, and golf markers sold under the Patchatto Wappen Factory brand.

The revenue model combines project-based B2B construction revenue (quote-based per project) with a software licensing stream for Kenken no Denki and a smaller e-commerce/retail stream for material sign products. Go-to-market is primarily direct sales through dedicated construction managers and sales consultants operating from the Osaka and Tokyo dual headquarters, supplemented by trade show participation (Orgatech Tokyo, JAPANTEX, Influencer's EXPO, Osaka Kangyo Exhibition) and self-serve software trials. The company has invested in operational technology including Log Kun construction management robots from log build (deployed December 2021) and the andpad construction management platform, indicating a deliberate digitization strategy.

Strategic milestones include the September 2022 absorption of wholly-owned subsidiary S-Build System Co., Ltd., the September 2023 opening of a 260-tsubo second manufacturing facility in Amagasaki, Hyogo, the October 2025 elevation of the Tokyo branch to Tokyo Head Office, and the announced June 2026 closure of the MURUI resin table B2C brand. The company claims 19 consecutive periods of revenue growth. Operations span Osaka HQ, Tokyo HQ, two logistics warehouses in Osaka (Hirabayashi) and Tokyo (Sumida), and until mid-2026 the Amagasaki resin manufacturing facility.

Name

S-Build

Legal name

株式会社エス・ビルド

Website

https://s-build.jp

Company type

Private

Founded year

2003

Operating status

Operating

Headcount range

51–100 employees

Short description

S-Build is a Japanese office interior construction contractor executing 2,000+ B2B fit-out projects annually, selling the Kenken no Denki quantity surveying software to 300+ construction firms, with a small PVC material sign product line. Founded 2003, dual HQ in Osaka and Tokyo.

Ownership category

akta.pro rank

Product category

Office Interior Construction Services

NAICS

Commercial and Institutional Building Construction (236220)

SIC

Construction - Special Trade Contractors (1700), General Bldg Contractors - Nonresidential Bldgs (1540)

akta.pro industry

PRIMARYIMAFACAA

Office & Corporate Building Construction

Industrials, Manufacturing & Construction/Construction & Civil Engineering/Commercial & Institutional Building Construction

SECONDARYIMAFANAI

Painting, Decorating & Wallcoverings

Industrials, Manufacturing & Construction/Construction & Civil Engineering/Interior Fit-Out & Finishing Contractors

Keywords

• Office interior construction
• Office fit-out contracting
• Architectural quantity surveying software
• Construction project management
• Material sign manufacturing

Headquarters

HQ city

Osaka

HQ country

Japan

HQ region

Asia

Offices5 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Office Interior Construction: Core B2B revenue stream from office interior fit-out, renovation, and restoration projects. S-Build handles the full range of interior construction work including partitioning, drywall, finishing, carpentry, electrical, HVAC, signage, and fire prevention. Annual project volume exceeds 2,000 jobs with a 90%+ client repeat rate.
2. 建築の電卓 (Keniku no Denki) software licensing: Interior material quantity calculation software sold as a subscription or perpetual license to construction companies and material manufacturers. Over 300 companies have adopted the software since its launch in April 2019. Software developed and sold by the company's 100% subsidiary which was merged into S-Build in September 2022.
3. Resin/MURUI Table manufacturing and sales (now closed): MURUI resin tables — combining natural wood with transparent epoxy resin — sold through dedicated showrooms (Minami-Horie, Osaka HQ showroom) and e-commerce. The brand achieved 35 tables sold within 2 months of opening the Minami-Horie store in October 2022. Delivery time was approximately 2 months. Note: This business was closed on June 30, 2026.
4. Material Sign Products (PVC-based merchandise): Production and sales of PVC-based patches, magnets, keychains, and golf markers through the Petat-to Wappen Factory brand (ペタッとワッペンファクトリー).

Pricing tiers

Go-to-market motion4 records

Distribution channels5 records

Marketing channels7 records

Core offering

S-Build is a specialized office interior construction contractor executing 2,000+ office fit-out, renovation, and restoration projects per year with a 90%+ client repeat rate, complemented by the proprietary Kenken no Dentaku (建築の電卓) architectural software for interior material quantity surveying and a PVC-based material sign products brand (Patchatto Wappen Factory). The company operates a dual-headquarters structure in Osaka and Tokyo covering all 47 Japanese prefectures.

Product overview

S-Build operates three distinct business segments: (1) Office Interior Construction — specialized office fit-out contracting delivering 'cool and impressive' office spaces with a 90%+ repeat rate and 2,000+ annual projects; (2) Architectural Software — the Kenken no Dentaku (建築の電卓) quantity surveying software for interior materials, which calculates material quantities from structural data, reducing estimation time by up to 75% and material waste by 50%; and (3) Material Sign Products — the Patchatto Wappen Factory (ペタッとワッペンファクトリー) brand for PVC-based patches, magnets, keychains, and golf markers sold via pw-factory.com. Note: The MURUI resin table brand (事業) was closed as of June 30, 2026.

Differentiator

Problem solved

Functional benefit

Brands

• MURUI: レジンテーブル・ンバーテーブルのブランド。天然木とエポキシレジンを組み合わせたテーブルを製造販売。2026年6月30日で事業は閉鎖。
• 建築の電卓
• マテリアルサイン事業

Quantifiable outcome

• Estimation time reduced by up to 75% and material waste reduced by 50% using 建築の電卓 software
• +5 more outcomes

Named customers10 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Four partnerships are on record, tiered core and minor.

• andpad (アンドパッド)coreTechnology or Integration · 21 September 2022S-Build uses andpad's construction management software platform as part of its internal operations and sales/field management separation system. andpad collaborated on a joint webinar explaining S-Build's operational structure.
• ConTech LAB / 桐井製作所minorStrategic or Co-development Partner · 12 July 2022S-Build employee 今津 participated as a speaker at the 'Construction Company Business Efficiency Seminar' organized by ConTech LAB (operated by Knit Seisakusho/Kirii Seisakusho) on July 12, 2022. The event targeted construction DX and business efficiency for construction companies.
• log build (ログくん施工管理ロボット)coreTechnology or Integration · 16 December 2021S-Build adopted log build's construction management robot 'Log Kun (ログくん)' enabling remote site monitoring via smartphone, iPad, or PC. The robots allow real-time voice communication and annotation with on-site workers. Three units were deployed in Tokyo and Osaka from December 2021, reducing travel time by 2-3 hours per day per manager.
• Makuake (マクアケ)minorGTM or Marketing Partner · 1 July 2021MURUI resin tables were initially launched via Makuake crowdfunding in July 2021, where the 'リバーテーブル mini' sold out its target within 1 day and reached 170%+ of its funding goal.

Scale indicators10 records

Recent moves12 records

Expansion highlights6 records

Broad incumbents

• Plus Corporation: Japanese office furniture and interior products manufacturer with workspace solutions. Overlaps with S-Build in office interior markets but operates primarily as a furniture and stationery manufacturer rather than fit-out contractor.
• Sangetsu Corporation: Major Japanese interior materials supplier (wallcoverings, flooring, curtains) serving commercial and residential markets. Adjacent to S-Build's interior construction work as a materials input supplier and comparable customer base.
• Okamura Corporation: Leading Japanese office furniture, storage, and workspace solutions company. Comparable as an office environment provider but operates primarily as a furniture manufacturer rather than a construction contractor like S-Build.
• Itoki Corporation: Japanese office furniture and interior solutions provider increasingly offering workspace design and construction services. Overlaps with S-Build in office interior but anchored in furniture manufacturing rather than specialized contracting.
• Kokuyo Co., Ltd. Major Japanese office furniture and workspace solutions provider with growing interior construction services. Competitor in office environments but operates primarily as a furniture manufacturer with broader portfolio than S-Build's specialist fit-out focus.

Others

• Hazama Ando Corporation: Large Japanese general construction contractor with significant office and commercial building portfolio. Tangentially comparable as a nonresidential builder but operates at much larger scale and broader scope than S-Build's specialized office interior focus.
• Aeon Delight Co., Ltd. Japanese facility management and construction services company. Adjacent to S-Build as a complementary service provider for office environments but focused on ongoing facility operations rather than fit-out construction.

Direct peers

• Nomura Co., Ltd. Major Japanese commercial interior design and construction company serving offices, retail, and commercial spaces. Comparable to S-Build as a vertically integrated interior contractor executing multi-trade office fit-out projects, though at significantly larger scale.
• Space Co., Ltd. Japanese interior construction company focused on office and retail environments with nationwide coverage. Highly comparable to S-Build in target market (office interior) and service model (comprehensive multi-trade fit-out contracting).
• Tanseisha Co., Ltd. Japanese commercial interior design and construction firm specializing in corporate offices, retail, and public spaces. Comparable as a direct competitor in the office interior fit-out market with similar single-source contracting across multiple trades.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/sbuild2003
• YouTubeyoutube.com/watch?v=FoVxzQqXNU8
• Facebookfacebook.com/sbuild.japan/?ref=aymt_homepage_panel&eid=ARARWQy6r50KodWEJ-QQPsDhiw9avF7jFI5nLJAS1gN7gys76TqAh72Rvs8TVnLYCFMRsACNRj2Zck_T
• Instagraminstagram.com/sbuild_saiyo

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 S-Build