How developers can access Ontario's home builder database via undocumented API
Ontario's Home Construction Regulatory Authority (HCRA) maintains a public Ontario Builder Directory (OBD) listing all licensed, expired, revoked, and refused home builders in the province. The directory contains contact details, licence status, homes built, warranty claims, and insolvency flags for each builder, but offers no bulk download or documented API. A developer guide published in 2026 reveals two undocumented JSON endpoints behind the directory's search interface that allow programmatic access to both summary and detailed builder records. Using Python, developers can query builders by name and enrich each result with full contact and track-record data from the detail endpoint. The dataset is aimed at suppliers, PropTech tools, and B2B sales teams targeting Ontario's residential construction sector, though it covers home builders only and excludes trade subcontractors.
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