ADU Regulations in Lompoc, California (2026)

Regulations at a glance

Local rules & notes

Illegal Entrance Location Mandates: The city tried to force ADU/JADU entrances to the side or rear; HCD ruled this can only be requested 'whenever feasible' and cannot be a strict requirement. Prohibited JADU Parking Replacement: The city's ordinance incorrectly required replacement of off-street parking when a garage is converted to a JADU. Multifamily Unit Combination Restrictions: The city attempted to prevent owners of multifamily dwellings from combining internal conversions with detached ADUs.

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

Frequently asked questions about ADU regulations in Lompoc

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

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

• What are the setback requirements for ADUs in Lompoc?

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

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

  In Lompoc, 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 Lompoc or county planning for your zone.

• Is ADU approval ministerial in Lompoc?

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

• Are there parking requirements for ADUs in Lompoc?

  In Lompoc, parking for ADUs is generally false. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Lompoc planning for your address.