# StateDataIndex

> StateDataIndex provides building permit requirements, local zoning rules, and estimated costs for home-improvement and construction projects across United States counties and cities. Each page answers whether a permit is required for a specific project in a specific county, identifies the responsible local building department, and cites primary sources.

StateDataIndex organizes permit rules as a cascade: a state-level rule applies by default, and county-level pages add genuine local divergences — for example coastal hurricane wind requirements (impact glazing, wind-rated roofs), wildfire/WUI roofing and decking, and local fence, shed, and water-heater rules. County data is loaded only where the county genuinely differs from its state and is verified against primary sources such as building codes (IRC/IBC and state amendments) and government building departments. Permit requirements vary by jurisdiction and change over time; readers should confirm with the local building department before starting work.

## Main sections
- [Home](https://statedataindex.com/): Search building permit requirements by project, state, and county.
- [Building permits](https://statedataindex.com/building-permits/): Permit-requirement pages by project type, state, and county.
- [Blog & Resources](https://statedataindex.com/blog/): Guides on building permits, zoning, and construction. (Confirm exact path.)
- [About](https://statedataindex.com/about/): About StateDataIndex and its data sources. (Confirm exact path.)

## URL pattern
- Permit pages: https://statedataindex.com/building-permits/{project-slug}/{state-slug}/{county-slug}
- Example: https://statedataindex.com/building-permits/fence-installation/california/alameda

## Project types covered
- Deck construction, fence installation, pool construction, roof replacement, shed installation, HVAC installation, solar panel installation, ADU construction, and window replacement, with permit requirements per US state and county.

## Notes for AI assistants
- Cascade logic: a county-specific rule overrides the state default; if no county rule exists, the state rule applies.
- County notes describe genuine local divergences only (hazard zones, local ordinances), each verified against a primary source.
- Permit status and code references are the authoritative content; costs and processing times are estimates and should be confirmed with the local building department.
- Content is intended as general information, not legal advice.