Can I build an ADU in California?

ADU regulations vary by municipality in California. Most urban areas now allow ADUs with specific size and setback requirements. Use ReadyPermit.AI to check your specific address.

How long does permitting take in California?

Permit timelines vary significantly by jurisdiction and project complexity. Simple permits may take 2-4 weeks while complex projects can take 3-6 months. We recommend starting the process early.

What are typical setback requirements in California?

Setbacks depend on your zoning district. Typical residential setbacks are 20-30 feet front, 5-10 feet side, and 15-25 feet rear. ADUs often have reduced setback requirements of 4-5 feet.

State Guide

California Zoning & Permit Guide

Name: Offgrid Infrastructure Platform
Brand: Offgrid

Navigate California's zoning regulations and building permit process with confidence. Whether you're building an ADU, adding a second story, or developing land, this guide covers everything you need to know about California's building requirements.

120 Days

Avg. Permit Timeline

$3,500

Avg. Permit Cost

39,538,223

Population

3,000+

Jurisdictions Covered

Zoning Overview

California has some of the nation's most progressive ADU laws, with state mandates requiring local jurisdictions to allow ADUs by right in single-family zones. SB 9 allows lot splits and duplexes in residential areas.