ConstRoom Launches Nationwide: A Zero-Commission Platform for Custom Home Building

For Exterior Inc. (Headquarters: Kanagawa Prefecture; Representative: Yuki Saito) has launched 'ConstRoom' (https://const-room.com/), a web service platform that connects clients considering custom home construction with contractors and builders across Japan.

As the hurdles for custom home building continue to rise due to soaring material and labor costs, ConstRoom offers a place where clients and local contractors can connect directly, featuring zero brokerage fees and end-to-end support via AI. Following approximately a year and a half of development, the service has officially launched nationwide today.

Background of the Service

### Rising Housing Costs and Growing Disparity

Construction costs for custom homes have surged significantly in recent years due to rising material and labor costs. As the 'once-in-a-lifetime purchase' becomes increasingly expensive, more clients are struggling with cost transparency and the difficulty of choosing a contractor.

Conversely, regional contractors and craftsmen who perform the actual labor face structural challenges, as the involvement of house manufacturers and intermediaries creates information asymmetry and cost inefficiencies, making it difficult for them to be fairly evaluated.

### Labor Shortages and Contractor Survival

The construction industry faces a severe labor shortage, and small-to-medium regional contractors often struggle to find new clients. While large house manufacturers can invest heavily in showrooms and advertising, technically skilled regional builders are at a disadvantage in terms of marketing and customer acquisition, often being driven out of business. ConstRoom aims to create an environment where excellent regional builders can thrive by offering a flat-rate subscription plan that is sustainable for them.

### Accelerated DX in Construction and Remaining Challenges

Attention to AI and digital transformation (DX) in the construction industry has increased significantly between 2025 and 2026. However, practical home-building sites still face numerous small inconveniences, such as information only being available at showrooms, perspective drawings requiring upfront payments, and difficulty in comparing price per tsubo (unit area). ConstRoom was designed to solve these issues using AI.

Service Overview

ConstRoom consists of five services that cover all phases of home construction:

- **ConstRoom Sketch**: AI architects propose a complete image of an ideal home, from location-specific layouts and floor plans to exterior and interior visuals, based on lifestyle. It takes just two minutes. - **ConstRoom Garden**: By simply inputting photos of the property and conditions, AI generates multiple exterior design proposals, allowing users to confirm the post-construction image before starting work. - **ConstRoom Thread**: Through a bulletin board function, clients can search for and consult with contractors in their area, accommodating a wide range of needs such as batch quotes and requests for proposals. - **ConstRoom Tsubotan**: Allows users to quickly compare the price per tsubo of contractors by region, conditions, or keywords. Detailed information can be checked with a single click. - **ConstRoom Sanpai**: Simply by inputting the location and type of waste, AI proposes the optimal industrial waste disposal contractor. The search is completed in minutes while verifying distances on a map.