Ichi (IchiPlan)

Ichi (IchiPlan) — Building-code adoption and amendment registry: 269 code groups mapped across 30 states and 3,148 licensed code books, where each group is the set of codes a specific jurisdiction actually enforces — including the current state or municipal amendments layered on the model code. 184 of the 269 groups are municipal, which is the local ordinance layer that generic code sites flatten back into the model code. Organized by jurisdiction scope (national, state, county, municipal) and edition year, with a dated library snapshot refreshed by weekly additions, plus ancillary non-code d…

Ichi (IchiPlan) offers (Reference, Alternative, Geospatial) — Printed directly: 3,148 licensed code books across 269 code groups in 30 states, of which 184 groups are municipal and 7 are national-edition sets, plus county and state groups. Distribution is heavily concentrated — California alone accounts for 168 of the 269 groups — and book counts per group range from 1 (a single municipal master fee schedule) to 18 (a state code set). Each book is a full code publication, so the corpus is on the order of hundreds of thousands of pages of code text with amendment mapping..

Regulatory-diff datasets for model fine-tuning: paired model-code-versus-adopted-code text across 269 jurisdictions and seven national editions is rare supervision for amendment-aware legal reasoning and long-document contradiction detection. Automated plan-review and permit-precheck models requiring jurisdiction-specific rule grounding rather than model-code assumptions. Housing-policy and upzoning research using municipal amendment adoption as the treatment variable. Insurance and engineering underwriting features keyed to which code edition and amendments a property is subject to, since wildfire, seismic and energy provisions vary by adoption. Construction-cost and development-feasibility modeling using the fee-schedule and local-amendment layers. Retrieval-augmentation evaluation for code compliance, where the correct answer is the amended local provision rather than the model code — the exact failure mode this dataset exists to correct.

The data is with 20 years of history.

Coverage spans US; Application Software, Construction & Engineering; reference, alternative, geospatial; equities.