Download the Data
This dataset is designed for journalists, researchers, housing advocates, builders, and homeowners who need structured ADU rules without scraping city pages one by one.
Structured JSON
Nested zoning, permit, cost, rental, and source-count fields for each city.
Download JSON → CSVSpreadsheet CSV
Flat file for Sheets, Excel, data analysis, and quick city comparisons.
Download CSV →Included Fields
| Category | Fields |
|---|---|
| City identity | City, state, slug, page URL, population, last updated |
| Zoning | Allowed zones, max sizes, height, setbacks, parking, owner occupancy, lot size, max units |
| Permits | Timeline, permit fees, impact fees, pre-approved plan availability |
| Costs | Average build cost, cost per square foot, garage conversion cost, prefab ADU cost |
| Rental income | 1BR rent, 2BR rent, short-term rental status, ROI estimate |
| Trust signals | ADU-friendly score and source count per city |
Citation
ADU Zoning Hub. ADU city rules dataset. Accessed from https://www.aduzoning.org/data/.
License: CC-BY-4.0. Please link back to the dataset page when using this data publicly.
Methodology
ADU Zoning Hub compiles zoning and permit rules from city planning departments, municipal code pages, state housing agencies, and related official guidance where available. Cost and rental ranges use market data sources and are presented as estimates. Always verify regulatory details with the local planning department before making financial or construction decisions.