Accessory Structures in Spanish Fork, UT: What Residents Actually Need to Know

If you live in Spanish Fork or are thinking about moving there, accessory structures are one of those things you probably won't think about until they affect you directly. Spanish Fork has 4 specific rules on the books covering different aspects of accessory structures, and some of them might surprise you.

Carport Rules

Spanish Fork regulates carports as accessory structures under Spanish Fork City Code Sec. 15.3.24.090(A). All accessory structures require a building permit, must sit behind the front wall plane of the principal structure, and may not exceed 20 feet to the peak of the roof (24 feet on lots over a half-acre with matching setbacks). Detached structures over 200 square feet must maintain a minimum 5-foot setback to side and rear property lines. Combined detached accessory structure square footage cannot exceed 15% of the lot when entirely within the principal structure's setbacks, or 10% if located elsewhere on the lot.

Key details: Code Section: Sec. 15.3.24.090(A) Accessory Structures. Permit Required: Yes - all accessory structures. Location: Behind front wall plane of principal structure. Max Height: 20 ft (24 ft on >0.5 acre with matching setbacks). Setback (>200 sq ft): 5 ft to side/rear property line.

Building or expanding a carport in Spanish Fork without a Sec. 15.3.24.090(A)(1)(a) building permit, locating it in front of the principal structure's front wall plane, exceeding the 20-foot (or 24-foot, for half-acre-plus lots) height cap, missing the 5-foot side or rear setback for structures over 200 square feet, or pushing the lot's combined detached accessory square footage above the 15% / 10% lot-coverage limits violates Sec. 15.3.24.090(A) and Sec. 14.04.010. Under Title 15 Sec. 15.1.04.030(C), violation of any provision of Title 15 is a Class C misdemeanor punishable by fine, imprisonment, or both, and each day a violation continues is a separate offense. Spanish Fork's Building Department and Community Development can issue stop-work orders, require after-the-fact permits or removal, and pursue injunctive relief under Utah Code Section 10-9a-803.

Shed Rules

Sheds and detached accessory structures in Spanish Fork require building permits. Structures under 200 square feet may qualify for a simplified permit process. Setback requirements from property lines apply.

Key details: Permit required: Yes — for sheds and accessory structures. Under 200 sq ft: May qualify for simplified permit process. Setbacks: Typically 3–5 feet from rear and side property lines. Front yard: No accessory structures in front yard setback. Snow loads: Must meet Utah County structural requirements.

Unpermitted structure: retroactive permit with penalty. Non-compliant setback: modification or removal.

The rules around shed rules in Spanish Fork lean permissive, but that does not mean anything goes.

Garage Conversions

Garage conversions to living space require a building permit in Spanish Fork. Converting a garage to an ADU or habitable space must meet all residential construction standards including insulation, egress, and parking replacement.

Key details: Permit required: Yes — full building permit for habitable space conversion. Code compliance: Must meet IBC/IRC standards for insulation, egress, electrical, plumbing. Parking: Eliminated parking spaces must be replaced on-site. ADU conversion: Must comply with SFMC §15.3.24.090(E) ADU standards.

Unpermitted conversion: building code enforcement. Must bring to code or restore. Safety violations: immediate correction.

ADU Rules

Spanish Fork permits ADUs in residential zones (except A-E, R-4, R-5, R-O) with a minimum 6,000 sq ft lot. Owner-occupancy is required. Annual registration ($60) is mandatory. ADUs are not permitted as STRs.

Key details: Minimum lot size: 6,000 square feet. Owner occupancy: Required — owner must occupy primary or ADU. Permitted zones: All residential except A-E, R-4, R-5, R-O. Parking: 4 off-street spaces for external ADU; 3 for internal ADU. Annual registration: $60/year through CitizenServe.

Unpermitted ADU: standard building code enforcement. May require demolition or legalization. Occupying unpermitted dwelling: code violation.

The Bottom Line

Spanish Fork's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Spanish Fork is broadly strict or permissive.

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