ADU Regulations in Del Mar, California (2026)

Regulations at a glance

Local rules & notes

Septic Constraint on Lot Splits: SB9 lot splits on parcels with onsite septic are generally prohibited unless the parcel is at least 1 acre, with exceptions for specific areas (Rio del Mar, Monte Toyon) where 15,000 sq. ft. is allowed if served by public water. Coastal Zone Hybrid Permit: ADUs in the Coastal Zone require a special 'hybrid' building permit that includes Coastal findings, differing from the standard ministerial process. Pleasure Point Standards: Specific height and setback overlays apply to the Pleasure Point area, including a 22' max height for ADUs over garages. Reduced ADU Fees: Impact fees are waived for JADUs and ADUs smaller than 750 square feet.

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

Frequently asked questions about ADU regulations in Del Mar

• What is the maximum ADU size in Del Mar, California?

  In Del Mar, 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; Del Mar may follow state defaults or have local limits. Verify with Del Mar planning for your specific lot.

• What are the setback requirements for ADUs in Del Mar?

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

• What is the maximum height for an ADU in Del Mar?

  In Del Mar, 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 Del Mar or county planning for your zone.

• Is ADU approval ministerial in Del Mar?

  In Del Mar, 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; Del Mar planning can confirm the exact process.

• Are there parking requirements for ADUs in Del Mar?

  In Del Mar, 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 Del Mar planning for your address.