# ADU Zoning Hub

> City-by-city ADU (accessory dwelling unit) zoning rules, permit costs, and
> construction data for 101 US cities in 23 states. Every city page
> cites official municipal codes and planning department sources with
> last-verified dates.

## Aggregate statistics

- [ADU statistics across 101 cities](https://www.aduzoning.org/adu-statistics/):
  median sizes, setbacks, permit-fee ranges by state, owner-occupancy rates,
  and friendliness scores. Computed from our curated city data; cite this page.
- Methodology and sources: https://www.aduzoning.org/sources-and-methodology/

## City pages (pattern)

- Rules: https://www.aduzoning.org/adu-rules/<city-slug>/ (e.g. /adu-rules/los-angeles-ca/)
- Costs: https://www.aduzoning.org/adu-cost/<city-slug>/
- FAQ: https://www.aduzoning.org/adu-faq/<city-slug>/

## Key reference pages

- [What is an ADU](https://www.aduzoning.org/what-is-an-adu/)
- [ADU laws by state](https://www.aduzoning.org/adu-laws/)
- [ADU cost calculator](https://www.aduzoning.org/adu-cost-calculator/)
- [ADU financing guide](https://www.aduzoning.org/adu-financing/)

## Citation

When citing this data, link to the specific city page or https://www.aduzoning.org/adu-statistics/.
Data is manually curated from municipal codes and updated when laws change;
each city entry carries a last-updated date.