Geographic coverage

Where ADUVerify works

Coverage is determined by data availability — zoning transparency, environmental screening APIs, rental market data, and ADU regulatory consistency. We do not launch a state until report quality meets California standards.

✓ California
LIVE
Environmental screening
  • CAL FIRE FRAP 2024 — all 58 counties
  • FEMA NFHL flood zones — all counties
  • Coastal zone identification
Rental market
  • RentCast AVM — statewide
  • Live comparables where available
  • AI estimate for low-density markets
Enhanced city zoning branches
Los Angeles San Diego Oakland San Jose Orange County

All other California cities receive California state ADU law minimums with statewide environmental screening.

California by the numbers
Metric Value Source
Counties covered 58 of 58 Statewide
Total residential properties 10.15M+ ATTOM 2025
Single-family zoned residential land 95.8% UC Berkeley 2024
Est. properties with ADU potential 6.1M+ Metcalf (2021), Terner Center / UC Berkeley
ADUs permitted in California (2024) 26,648 CA HCD 2024
Major metro areas covered 10+ LA, SD, Bay Area, SJ, OC, SAC, IE, VTA, SB, Fresno
City zoning branches 5 LA, San Diego, Oakland, San Jose, Orange County

ADU potential estimate based on single-family zoning prevalence (UC Berkeley Othering & Belonging Institute, 2024) with conservative eligibility adjustment for lot size, density, and overlay restrictions. Not a parcel-by-parcel determination.

◑ In Development
2026–2027
Oregon
HB 2001 (2019) permits ADUs statewide on single-family lots. Environmental API coverage via Oregon State GIS and FEMA NFHL. Rental market coverage via RentCast — Portland and Salem markets already have strong comparable density.
Washington
HB 1337 (2023) requires cities to allow ADUs by right statewide. King County, Pierce County, and Snohomish County GIS APIs are accessible. Seattle and Bellevue have active ADU markets.
Colorado
HB 24-1152 (2024) mandates ADUs in all Colorado metro areas. Denver, Boulder, and Fort Collins have active ADU programs. Environmental screening via Colorado GIS and FEMA NFHL.
○ Research Phase
TBD
Texas — No statewide ADU mandate but Austin, Houston, Dallas, and San Antonio all permit ADUs at the city level. City-level GIS coverage varies — Austin has excellent open data, Houston does not have single-family zoning. City-by-city approach required.

Florida — SB 1604 (2023) streamlined ADU permitting. Miami-Dade, Orange County FL, and Hillsborough have active ADU programs. RentCast coverage is strong in Miami and Tampa markets.

Quality standards for state launch

ADUVerify does not launch new states based on market demand alone. Every new market must meet minimum standards across five dimensions before a state goes live:

Public zoning transparency GIS zoning data accessible via public API at county or city level
Environmental screening Fire, flood, and environmental hazard APIs available statewide
Rental market coverage RentCast or equivalent AVM data density in major metro markets
ADU regulatory consistency State ADU law or city-level framework clear enough to encode
Report accuracy validation Minimum 20 test reports pass internal QA before public launch

Get notified when your state launches

We’ll email you when Oregon, Washington, or Colorado goes live — and when your city gets an enhanced zoning branch.