ADU Regulations in Rolling Hills Estates, California (2026)

Regulations at a glance

Local rules & notes

Illegal Neighborhood Compatibility Review: The city attempted to require a 'neighborhood compatibility determination' for two-story attached ADUs, which is prohibited under ministerial review. JADUs in Attached Garages: The city incorrectly tried to exclude attached garages from being converted into JADUs. Multifamily Detached ADU Bonus: Under SB 1211, lots with existing multifamily dwellings can now have up to eight detached ADUs.

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

Frequently asked questions about ADU regulations in Rolling Hills Estates

• What is the maximum ADU size in Rolling Hills Estates, California?

  In Rolling Hills Estates, 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; Rolling Hills Estates may follow state defaults or have local limits. Verify with Rolling Hills Estates planning for your specific lot.

• What are the setback requirements for ADUs in Rolling Hills Estates?

  In Rolling Hills Estates, 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 Rolling Hills Estates planning for overlay zones or design standards that could affect your site.

• What is the maximum height for an ADU in Rolling Hills Estates?

  In Rolling Hills Estates, 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 Rolling Hills Estates or county planning for your zone.

• Is ADU approval ministerial in Rolling Hills Estates?

  In Rolling Hills Estates, 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; Rolling Hills Estates planning can confirm the exact process.

• Are there parking requirements for ADUs in Rolling Hills Estates?

  In Rolling Hills Estates, 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 Rolling Hills Estates planning for your address.