ADU Regulations in Twentynine Palms, California (2026)

Regulations at a glance

Local rules & notes

Non-conforming ADU Amnesty: Owners of non-conforming ADUs have a five-year period to correct building code violations. HELPR Tool Eligibility: SCAG provides a specialized GIS tool (HELPR) to identify parcels with physical space for detached ADUs based on footprint and setbacks. Pre-approved Floor Plan Savings: Several cities in the region provide pre-approved plans to save on architecture and engineering fees.

For the official ordinance and latest updates, check your city or county planning department.

Frequently asked questions about ADU regulations in Twentynine Palms

• What is the maximum ADU size in Twentynine Palms, California?

  In Twentynine Palms, the maximum ADU size is typically 800 square feet, depending on whether the unit is attached or detached. California state law allows up to 1,200 sq ft for detached ADUs and 800 sq ft for attached in many jurisdictions; Twentynine Palms may follow state defaults or have local limits. Verify with Twentynine Palms planning for your specific lot.

• What are the setback requirements for ADUs in Twentynine Palms?

  In Twentynine Palms, typical setback requirements are 4 feet from the side property line and 4 feet from the rear. These may be reduced to 4 feet under California Government Code § 65852.2 where applicable. Check with Twentynine Palms planning for overlay zones or design standards that could affect your site.

• What is the maximum height for an ADU in Twentynine Palms?

  In Twentynine Palms, the maximum height for an ADU is generally 16 feet. State law often allows up to 16 feet for detached ADUs and up to 25 feet when within 4 feet of the property line in some cases. Confirm with Twentynine Palms or county planning for your zone.

• Is ADU approval ministerial in Twentynine Palms?

  In Twentynine Palms, ADU approval is typically Ministerial (by-right) per Gov Code §65852.2. Ministerial (by-right) review means the city must approve qualifying applications without discretionary review, per California Gov Code § 65852.2. Your project must still meet objective standards; Twentynine Palms planning can confirm the exact process.

• Are there parking requirements for ADUs in Twentynine Palms?

  In Twentynine Palms, parking for ADUs is generally true. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Twentynine Palms planning for your address.