Carport Rules: Costa Mesa vs Midway City

Do I need a permit to build a carport in Costa Mesa?

Yes. The 2022 California Residential Code adopted in CMMC Title 5 requires a building permit for any structural carport because it has roof framing and load-bearing posts. The 120-square-foot accessory-structure permit exemption in CRC Section R105.2 applies only to detached tool and storage sheds, not carports. Apply through the Costa Mesa Building Division and confirm zoning compliance with Planning before construction.

Where on my lot can I put a carport?

CMMC Title 13 sets the setbacks, height, and lot coverage by zone. Carports generally cannot encroach into a required front-yard setback and must meet the side-yard setback of the main dwelling when attached. Detached carports must also meet rear-yard standards. Costa Mesa staff will check the zone (R1, R2, etc.) against the Title 13 development standards table during permit review. Confirm exact dimensions with Planning at (714) 754-5245.

Can a carport count toward my required covered parking?

Costa Mesa generally requires two covered parking spaces for a single-family home under Title 13. A carport that meets the dimensional standards for a covered parking space and is properly permitted under CMMC Title 5 can satisfy the covered parking requirement. Enclosing the open side of the carport without a permit converts it into a garage and triggers a separate plan check, change of use, and inspection.

Can I build a detached carport in my rear or side yard in unincorporated Orange County?

Yes. Section 7-9-70.3(d)(3) of the Orange County Codified Ordinances allows detached garages and carports to be placed any place within the required rear or interior side setback area, except within the corner-visibility zones where fences and walls are limited to 3.5 feet under Section 7-9-64. The carport must still meet the 10 ft by 20 ft minimum stall size and be permitted under the adopted California Building Code.

How much driveway space do I need in front of a carport?

Section 7-9-70.3(c)(2) requires 28 feet of unobstructed maneuvering area, measured from the outward end of the parking stall, in front of a carport. That requirement may be reduced by up to 4 feet in some configurations under Section 7-9-70.3(c)(4). For attached or detached side-entry garages, the unobstructed area required is 30 feet under Section 7-9-70.3(c)(1).

Can I convert my existing carport to an ADU?

Yes. Section 7-9-90(a)(2) of the Codified Ordinances allows conversion of an existing accessory structure into an ADU, and Section 7-9-90(d)(3) provides that no replacement parking is required when a carport is converted to or removed for an ADU. The conversion is processed ministerially under Government Code 65852.2 and must comply with the California Building Code as adopted under Title 7.