ADU Regulations in Carlsbad, California (2026)

Regulations at a glance

Local rules & notes

ADUs Cannot Satisfy HCA Replacement in For-Sale Projects: An ADU cannot be used as a replacement unit for a demolished protected unit if the proposed development is a for-sale project. Since Carlsbad does not allow separate conveyance of ADUs, the ADU cannot meet the requirement that replacement units in for-sale projects must also be for-sale. JADU Conveyance Prohibition: Junior ADUs (JADUs) are strictly prohibited by state law from being sold separately from the primary unit, and thus can never be used as for-sale replacement units under the Housing Crisis Act.

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

Frequently asked questions about ADU regulations in Carlsbad

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

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

• What are the setback requirements for ADUs in Carlsbad?

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

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

  In Carlsbad, 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 Carlsbad or county planning for your zone.

• Is ADU approval ministerial in Carlsbad?

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

• Are there parking requirements for ADUs in Carlsbad?

  In Carlsbad, 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 Carlsbad planning for your address.