How Santa Maria Handles Accessory Structures: A Practical Guide

Santa Maria maintains 50 local ordinances across all categories, and 4 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Santa Maria falls on the strict-to-permissive spectrum compared to other cities.

Carport Rules

Carports in Santa Maria are governed by Title 12 of the Municipal Code, including Chapter 12-27 (Accessory Structures) and the Off-Street Parking and Loading chapter. Any street-facing carport must sit at least 20 feet from the property line, each covered space must be at least 9.5 by 20 feet, and detached accessory structures must stand at least 5 feet from any dwelling on the lot.

Key details: Code Chapter: SMMC Title 12, Ch. 12-27. Street Setback: 20 ft (18 ft roll-up). Single Stall (interior): 9.5 x 20 ft. Single-Car w/ Side Walls: 11 x 20 ft. Required SFR Spaces: 2 covered.

Building a carport without a permit, encroaching into required setbacks, exceeding the 25 percent rear-yard coverage limit, exceeding the height envelope at or near a property line, or undersizing the parking stall can trigger code-enforcement action, stop-work orders, and required correction or removal. Loss of a required covered parking space (for example, by enclosing a carport without replacement parking) can also constitute a zoning violation.

ADU Rules

Santa Maria permits one ADU and one JADU per single-family lot ministerially within 60 days; detached ADUs may be up to 1,200 sq ft with 4-foot side/rear setbacks, and parking is waived within 1/2 mile of transit.

Key details: Detached ADU max size: 1,200 sq ft. Side/rear setback: 4 ft minimum. Parking near transit: Waived within 1/2 mile of public transit. Ministerial review: 60 days from complete application. JADU max size: 500 sq ft within primary residence.

ADUs built without a building permit or zoning certificate from the Community Development Director may not be rented, leased, or occupied as a separate dwelling, and under Section 12-56.09 unpermitted units must go through the conformance review (same standards as a newly proposed ADU) before they can be legalized.

The rules around adu rules in Santa Maria lean permissive, but that does not mean anything goes.

Shed Rules

Detached tool and storage sheds up to 120 square feet, 8 feet tall, and at least 5 feet from any other building are exempt from building permits but must sit behind the front wall of the dwelling and be screened by a 6-foot fence or wall.

Key details: Permit-exempt max size: 120 sq ft. Permit-exempt max height: 8 ft above grade (7 ft ceiling). Min separation from buildings: 5 ft from any other building. Location: Behind front wall of dwelling, screened by 6-ft fence/wall. Max exempt sheds per parcel: 2.

Sheds exceeding 120 sq ft or 8 ft in height require a building permit; structures built without required permits or in violation of setbacks are subject to code enforcement under Santa Maria's nuisance abatement procedures and may have to be removed or relocated at the owner's expense.

Garage Conversions

When a garage is converted to an ADU in Santa Maria, no replacement off-street parking is required, but converting a garage to a JADU or to other non-ADU living space requires onsite replacement parking under Chapter 12-32.

Key details: Garage to ADU - replacement parking: Not required. Garage to JADU - replacement parking: Required (uncovered OK). Setback for converted garage ADU: No setback required. Permit required?: Yes - building permit always.

Converting a garage without a building permit creates an unpermitted structure subject to code enforcement; an unpermitted garage-to-ADU conversion cannot be rented as a separate dwelling and must go through the Section 12-56.09 legalization process meeting current ADU standards.

Santa Maria is more permissive than most cities when it comes to garage conversions. That said, there are still limits.

The Bottom Line

Compared to many U.S. cities, Santa Maria gives residents more room on accessory structures. 2 of the 4 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

This guide is based on Santa Maria's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.