Murrieta ADU Zoning Rules & Permit Guide

ADU Regulations in Murrieta, California

Updated September 29, 2026

In southwest Riverside County, Murrieta permits ADUs under California state law. The city's growing suburban neighborhoods welcome accessory units as part of the regional housing strategy.

Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Murrieta as of 2026. Regulations are governed by California's AB 68 (2020), AB 881 (2021), and AB 3182 (2024) which together establish a statewide ADU framework.

Additional Local Requirements for Murrieta

• ADU by right in residential zones
• Minimum 150 sq ft
• Height limit: 16 ft for detached

Frequently Asked Questions About ADUs in Murrieta

Can I build an ADU in Murrieta?

This California city follows the statewide AB 68 framework. Most single-family lots qualify for by-right ADU development.

What is the maximum ADU size allowed in Murrieta?

ADUs in Murrieta can be up to 1,200 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the Murrieta planning department before designing your project.

What are the setback requirements for an ADU in Murrieta?

ADUs in Murrieta generally require setbacks of 4 ft rear, 4 ft side. California state law (AB 68) limits local setback requirements to 4 feet for existing structures, but always verify with local zoning.