Lib Work
Kumamoto-based publicly listed homebuilder that designs, constructs and sells custom houses, including a patented soil-based (cement-free) 3D-printed housing line called Lib Earth House.
- CEO / Founder
- Chikara Seguchi (瀬口力)
- Team Size
- 201-500
- Stage
- Public
- Total Funding
- $1.2M
- Latest Round
- IPO
Technology & Products
Key Products
Lib Earth House model A and model B (3D-printed earthen houses); conventional custom-built detached houses (main business); 3D-printed non-residential structures (planned); NFT-based housing asset data platform (with Asteria).
Technological Advantage
Patented cement-free 3D-printing material formulation (soil/lime/natural fiber) achieving ~5x strength of earlier model vs conventional earthen 3D-print mixes, obtained official building confirmation certification in Japan.
Differentiation
Value Proposition
Uses construction 3D printing with a proprietary cement-free, earth/lime/plant-fiber material to build custom-shaped homes with lower CO2 emissions, addressing Japan's shrinking skilled-labor pool and rising imported material costs.
How They Differentiate
Combines decades of conventional homebuilding/sales experience (since 1997, public since 2015) with proprietary cement-free earthen print material and full custom design freedom, versus competitors' typically smaller prefab/concrete-based 3D-printed units.
Market & Competition
Target Customers
Japanese homebuyers seeking custom-designed detached houses; also targets non-residential clients (glamping sites, hotels, facades, retail) and franchise/partner companies for nationwide rollout.
Industry Verticals
Residential construction/homebuilding; emerging non-residential (hospitality, retail, space development)
Competitors
Serendix (セレンディクス) - Japan's other leading construction 3D-printing house builder; Polyuse - Japanese construction 3D printing contractor; WASP (Italy) - international earthen/clay 3D-printed housing pioneer.
Growth & Milestones
Growth Metrics
FY2025 (ended June 2025) revenue ¥16.0B; employees 368 (June 2026); listed TSE Growth market cap ~¥15.8B (Aug 2026); 2020 detached-house orders roughly doubled year-over-year per Forbes Japan.
Major Milestones
1997: founded as 有限会社瀬口工務店; 2015-08: IPO on Fukuoka Q-Board; 2018: renamed to Lib Work; 2019-06: uplisted to Tokyo Stock Exchange (then Mothers, now Growth) as ticker 1431; 2022: partnership with Arup for DEEP α 3D-printed house; 2024-2025: completed Lib Earth House model A and model B (Japan's first soil-based 3D-printed houses); 2026-01: began sales of patented soil 3D-printer housing material/product line.