ADU Regulations in Exeter, California (2026)

Regulations at a glance

Local rules & notes

Four-Vehicle Parking Requirement: The ordinance requires a total of at least four off-street parking spaces for the property when an ADU is added, which is significantly higher than typical ADU standards. Condominium Conversion Prohibition: Explicitly prohibits converting the ADU and lot into a condominium or distinct ownership form. Senior Impact Fee Waiver: A full or partial waiver of school facility impact fees is available for residential units restricted to occupancy by seniors (62+). Special Exception Required: ADUs are not permitted by right; they require a Special Exception from the Board of Adjustment.

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

Frequently asked questions about ADU regulations in Exeter

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

  In Exeter, the maximum ADU size is typically 900 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; Exeter may follow state defaults or have local limits. Verify with Exeter planning for your specific lot.

• What are the setback requirements for ADUs in Exeter?

  In Exeter, typical setback requirements are 15 feet from the side property line and 30 feet from the rear. These may be reduced to 4 feet under California Government Code § 65852.2 where applicable. Check with Exeter planning for overlay zones or design standards that could affect your site.

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

  In Exeter, the maximum height for an ADU is generally 35 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 Exeter or county planning for your zone.

• Is ADU approval ministerial in Exeter?

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

• Are there parking requirements for ADUs in Exeter?

  In Exeter, 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 Exeter planning for your address.