ADU Regulations in Lafayette, California (2026)

Regulations at a glance

Local rules & notes

Recessed Front Setback Requirement: Detached ADUs must be set back at least 1 foot behind the front building elevation of the primary dwelling. Front Door Orientation Restriction: The ADU entrance is prohibited from facing the street. Site Development Review Exemption: ADUs are explicitly removed from the requirement for Site Development Review, reducing process overhead. Modular vs Manufactured: While modular dwellings are permitted, mobile homes and manufactured homes are explicitly prohibited for use as ADUs.

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

Frequently asked questions about ADU regulations in Lafayette

• What is the maximum ADU size in Lafayette, California?

  In Lafayette, the maximum ADU size is typically 1000 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; Lafayette may follow state defaults or have local limits. Verify with Lafayette planning for your specific lot.

• What are the setback requirements for ADUs in Lafayette?

  In Lafayette, 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 Lafayette planning for overlay zones or design standards that could affect your site.

• What is the maximum height for an ADU in Lafayette?

  In Lafayette, 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 Lafayette or county planning for your zone.

• Is ADU approval ministerial in Lafayette?

  In Lafayette, 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; Lafayette planning can confirm the exact process.

• Are there parking requirements for ADUs in Lafayette?

  In Lafayette, 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 Lafayette planning for your address.