California ADU Information & Resources
ADU
- 2025 ADU Handbook (PDF)
- The ABCs of ADUs (PDF)
- ADU Best Practices (PDF)
- California Department of Housing and Community Development - ADU Homepage
- California Department of Housing and Community Development - Understanding Accessory Dwelling Units and Their Importance (PDF)
- California Department of Housing and Community Development - Accessory Dwelling Unit Memorandum (PDF)
- California Department of Housing and Community Development - SB 229 and AB 494 Changes (PDF)
- California Coastal Commission - Updates Regarding the Implementation of New ADU Laws (PDF)
Garage Conversion
SB-9
Financing
County & City ADU Information
Alameda County
Berkeley
Emeryville
Oakland
- Accessory Dwelling Unit Loan Program (ADULP)
- ADU Loan Program Guidelines and Forms for Homeowners
- Housing and Community Development Department - ADULP Program Description & Financing Terms (PDF)
- Housing and Community Development Department - ADULP Eligibility Checklist (PDF)
- Housing and Community Development Department - ADULP Owner Instructions (PDF)
- Accessory Dwelling Unit Ordinance Review (2023)
Piedmont
Butte County
Contra Costa County
County of Contra Costa
Danville
Hercules
Pittsburg
Richmond
San Pablo
San Ramon
Walnut Creek
Kern County
Kings County
County of Kings
Los Angeles County
County of Los Angeles
Arcadia
Agoura Hills
Avalon
Bellflower
Beverly Hills
- Beverly Hills ADU Requirements
- Planning Division - ADU Homepage
- Planning Division - ADU Frequently Asked Questions
- Planning Division - Pre-Approved ADU Program
- Planning Division - Pre-Approved ADU Program Property Owner Guide and Submittal Checklist (PDF)
- Planning Division - ADU Development Guide (Central Area) (PDF)
- Planning Division - ADU Development Guide (Hillside Area) (PDF)
- Planning Division - ADU Development Guide (Trousdale Estates) (PDF)
- Planning Division - ADU Development Guide (Multi-Family) (PDF)
- Planning Division - Incentive Accessory Dwelling Units (IADUs) (PDF)
- ADU Municipal Codes
Burbank
Commerce
Culver City
El Monte
Glendale
Hawaiian Gardens
La Canada Flintridge
Lakewood
Long Beach
- Long Beach ADU Requirements
- Community Development Department - ADU Homepage
- Community Development Department - Pre-Approved Accessory Dwelling Unit Program (PAADU).
- Community Development Department - Garage Conversion Permit Application Packet (PDF)
- Community Development Department - Backyard Builders Program Homepage
- Community Development Department - Backyard Builders Program Guidelines (PDF)
Los Angeles
- Los Angeles ADU Requirements
- Housing Department - ADU Homepage
- ADU & JADU Frequently Asked Questions (PDF)
- Conversions, Unpermitted Buildings or Unpermitted ADUs (PDF)
- Accessory Dwelling Unit Ordinance Review (2024)
- Planning Department - SB-9 Homepage
- SB-9 Frequently Asked Questions (PDF)
- Senate Bill 9: Two Unit Development and Urban Lot Split
Malibu
Palmdale
Palos Verdes Estates
Paramount
Pomona
Rancho Palos Verdes
Redondo Beach
Rolling Hills
Rosemead
San Dimas
Santa Clarita
Santa Marino
Santa Monica
Torrance
West Covina
Marin County
Mendocino County
Monterey County
Del Rey Oaks
Napa County
Orange County
County of Orange
Aliso Viejo
Anaheim
Brea
Buena Park
Costa Mesa
Cypress
Dana Point
Fountain Valley
Fullerton
Garden Grove
Huntington Beach
Irvine
La Habra
La Palma
Laguna Beach
Laguna Hills
Laguna Niguel
Laguna Woods
Lake Forest
Los Alamitos
Mission Viejo
Newport Beach
Orange
Placentia
Rancho Santa Margarita
San Clemente
San Juan Capistrano
Santa Ana
Seal Beach
Stanton
Tustin
Villa Park
Westminster
Yorba Linda
Riverside County
County of Riverside
Banning
Beaumont
Blythe
Calimesa
Canyon Lake
Cathedral City
Coachella
Corona
Desert Hot Springs
Eastvale
Hemet
Indian Wells
Indio
Jurupa Valley
La Quinta
Lake Elsinore
Menifee
Moreno Valley
Murrieta
Norco
Palm Desert
Palm Springs
Perris
Rancho Mirage
Riverside
San Jacinto
Temecula
Wildomar
Sacramento County
County of Sacramento
San Bernardino County
County of San Bernardino
Adelanto
Apple Valley
Barstow
Big Bear Lake
Chino
Chino Hills
Colton
Fontana
Grand Terrace
Hesperia
Highland
Loma Linda
Montclair
Needles
Ontario
Rancho Cucamonga
Redlands
Rialto
San Bernardino
Twentynine Palms
Upland
Victorville
Yucaipa
Yucca Valley
San Diego County
County of San Diego
Carlsbad
Chula Vista
Coronado
Del Mar
El Cajon
Encinitas
Escondido
Imperial Beach
La Mesa
Lemon Grove
National City
Oceanside
Poway
San Diego
- Development Services - ADU/JADU Homepage
- Development Services - ADU Requirements Bulletin
- Planning Department - ADU Incentives, Financing and Bonus Programs
- San Diego Municipal Code - Accessory Dwelling Units and Junior Accessory Dwelling Units
- Companion Unit Handbook (PDF)
- San Diego Housing Commission - ADU Finance Program
- San Diego Housing Commission - ADU Financing Flyer (PDF)
- Accessory Dwelling Unit Ordinance Review (2022)
San Marcos
Santee
Solana Beach
Vista
San Francisco County
San Francisco
San Joaquin County
San Luis Obispo County
County of San Luis Obispo
San Luis Obispo
San Mateo County
Atherton
Burlingame
Half Moon Bay
Hillsborough
Portola Valley
San Mateo
Santa Barbara County
Santa Clara County
Campbell
Gilroy
Monte Sereno
Palo Alto
Santa Clara
Saratoga
Sunnyvale
Santa Cruz County
County of Santa Cruz
- Department of Community Development and Infrastructure - Homepage
- Planning Division - ADU Homepage
- Planning Division - Accessory Dwelling Units: The Basics
- Planning Division - Types of ADUs
- Planning Division - ADU/JADU Development Standards Bulletin
- Planning Division - Pre-Designed ADU Plans & How-To Guide
- Planning Division - Accessory Dwelling Unit Financing
Santa Cruz
Siskiyou County
Sonoma County
County of Sonoma
Cotati
Rohnert Park
Stanislaus County
Sutter County
Ventura County
County of Ventura
Camarillo
Port Hueneme