ADU Regulations in Hermosa Beach, California (2026)

Regulations at a glance

Local rules & notes

Illegal Unit Cap: The City ordinance limits development to one ADU and one JADU (or two ADUs). HCD clarifies that state law permits a converted ADU, a detached new construction ADU, and a JADU on the same lot if requirements are met. Prohibited Deed Restrictions: The City requires a deed restriction for ADUs, which HCD states is prohibited by Government Code section 66315. Incomplete Size Protections: The City failed to include Floor Area Ratio (FAR) and Minimum Lot Size in the list of standards that cannot be used to restrict an ADU below 800 sq ft.

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

Frequently asked questions about ADU regulations in Hermosa Beach

• What is the maximum ADU size in Hermosa Beach, California?

  In Hermosa Beach, the maximum ADU size is typically 1200 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; Hermosa Beach may follow state defaults or have local limits. Verify with Hermosa Beach planning for your specific lot.

• What are the setback requirements for ADUs in Hermosa Beach?

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

• What is the maximum height for an ADU in Hermosa Beach?

  In Hermosa Beach, 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 Hermosa Beach or county planning for your zone.

• Is ADU approval ministerial in Hermosa Beach?

  In Hermosa Beach, 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; Hermosa Beach planning can confirm the exact process.

• Are there parking requirements for ADUs in Hermosa Beach?

  In Hermosa Beach, parking for ADUs is generally Often waived per state law; check local ordinance. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Hermosa Beach planning for your address.