Find Top ADU Builders & Contractors in California
Compare builders, analyze market data, and connect with ADU professionals across 500+ California cities. Everything you need to build a high-yield ADU.
Your Complete ADU Resource Platform
Everything you need to find, compare, and connect with the best ADU builders in California
Builder Directory
Find builders, contractors, and architects in your area. Compare options, read reviews, and connect with the top pros for your ADU project.
Market Intelligence
Make data-driven decisions. Dig into public agency data, visualize market growth trends, and validate your ADU investment with hard facts, not hype.
Location Data
Access hyper-local insights. Explore ADU trends, permitting costs, and active builder networks across 500+ California cities and counties.
What is an ADU?
ADU stands for Accessory Dwelling Unit. Also known as granny flats, in-law units, casitas, or backyard homes.
ADUs provide independent living space with their own entrance, kitchen, and bathroom. They can be rented out for income, used to house family members, or serve as a home office or guest space.
Detached ADU
A standalone structure separate from the main home, typically in the backyard.
Garage Conversion
Transforms an existing garage into a livable unit - often the most cost-effective option.
JADU (Junior ADU)
Small unit up to 500 sq ft created within your existing home's footprint.
Market Insights
Real-time real estate market data in California
Average Rent
Monthly rental price
$3K
Average Home Value
Property valuation
$783K
Find ADU Builders in your City
Explore ADU Contractors, architects, and designers in your area
How GrannyFlatFinder Works
Your complete guide to finding and connecting with the best ADU builders in California
Search
Browse local listings by city or specialty. Filter by service radius, construction type, and experience.
Compare
View business profiles and public info to evaluate different options side-by-side.
Analyze
Check local rental market data and potential ROI estimates for your area to plan your investment.
Connect
Reach out to listed contractors directly to request quotes and discuss your project needs.
Frequently Asked Questions
Everything you need to know about finding and working with ADU builders
Use our directory to search by city or county. We provide a curated list of active contractors in your area, along with local market data and rental insights. You can browse listings by location to find professionals serving your neighborhood.