The #1 ADU Builder Directory in California

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.

771+ Contractors
962+ Cities Covered
Real-time Market Data

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.

Attached ADU

Built as an extension to the main house, sharing at least one wall.

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

+2.5%

$3K

Average Home Value

Property valuation

-0.7%

$783K

Find ADU Builders in your City

Explore ADU Contractors, architects, and designers in your area

Los Angeles

52 builders

Avg. Rent

$3,012/mo

San Diego

45 builders

Avg. Rent

$3,011/mo

San Jose

38 builders

Avg. Rent

$3,419/mo

Sacramento

30 builders

Avg. Rent

$2,067/mo

Chico

19 builders

Avg. Rent

$1,613/mo

Fresno

17 builders

Avg. Rent

$1,682/mo

How GrannyFlatFinder Works

Your complete guide to finding and connecting with the best ADU builders in California

01

Search

Browse local listings by city or specialty. Filter by service radius, construction type, and experience.

02

Compare

View business profiles and public info to evaluate different options side-by-side.

03

Analyze

Check local rental market data and potential ROI estimates for your area to plan your investment.

04

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.

Ready to Find Your ADU Builder?

Browse and find builders, contractors, architects, and more. Compare options, analyze market data, and get started on your ADU project today.