Open House Group

From brokerage to buying land and building houses (2001)

Key decision·2001· Open House Group — the full company history →

The selling came first; the thing to sell was made in-house afterwards

Vertical integration is hardly a novel idea in real estate. What is striking about this decision is the order. Where most developers hold the land and the building first and work out how to sell them afterwards, Open House built a brokerage network that caught customers on the street and then made in-house the product to push through it. If you can buy land with the buyer already in view, the fear of carrying inventory recedes. That order is what allowed the company to give up the commission business as early as four and a half years after its founding.

Integration is not all upside, of course. A fall in land prices or an unsold house lands on your own books, and you take the swings in construction labour and material costs directly. That Open House kept the structure anyway is presumably because it judged that unless it kept pricing and the handling of difficult sites in its own hands, it could not compete on the ground it had chosen — cramped urban plots. Even after the later decisions to buy supply capacity from outside, with Hawk One in 2018 and Sanei Architecture Planning in 2023, the recurring question of how to wire an acquired company into that integrated model is a measure of how much the 2001 choice still weighs.

Read the full dossier in Japanese →

The Japanese edition carries the complete record of this decision — the situation that forced it, the options weighed, what actually followed, and the sources behind every claim.

Other key decisions at Open House Group


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Data API

Open House Group’s history, financials, executives and shareholders are published as static JSON — no key, plain GET. Full specification →

Method Endpoint Returns
GET /api/companies.json All companies
GET /api/3288/manifest.json Resource index
GET /api/3288/history.json History overview
GET /api/3288/timeline.json Chronology
GET /api/decisions.json All management decisions (index)
GET /api/3288/decisions.json Management decisions (index)
GET /api/3288/decisions/{slug}.json One decision (full dossier)
GET /api/3288/executives.json Executives
GET /api/3288/shareholders.json Major shareholders
GET /api/3288/financials.json Financial statements
GET /api/3288/financials-longterm.json Long-term results
GET /api/3288/segments.json Business segments
GET /api/3288/regions.json Sales by region
GET /api/3288/workforce.json Workforce