Anchorage, AK Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Anchorage, AK, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Citation
- AMC 21.05.070D.10
- Setback exception
- Alley-adjacent side/rear setback only
- Size cap, R-1 through R-2D
- 100% of house floor area
- Size cap, R-2M/R-3/R-4
- 50% of house floor area
- Exterior materials
- Must match principal structure
Summary
Anchorage lets a private carport encroach into a required side or rear setback next to an alley, but its combined floor area with any garage cannot exceed the house's own square footage in most residential zones.
Garage or carport, private residential. ... A private garage or carport may encroach into a required rear or side setback abutting an alley. ... In R-1, R-1A, R-2A, and R-2D, districts all garages or carports accessory to a single residential use, whether attached or detached from the principal structure shall cumulatively be no larger than 100 percent of the total gross floor area of the principal structure for lots smaller than 10,000 square feet, but not to exceed allowable lot coverage.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 5010260; v11 updated 2026-09-01).
Full Breakdown
Municipality of Anchorage zoning code lets a private garage or carport encroach into a required side or rear setback where it abuts an alley: the only setback exception zoning gives private carports. Size is capped by zone: in R-1, R-1A, R-2A and R-2D, garages and carports (attached or detached) can't cumulatively exceed 100% of the principal structure's gross floor area on lots under 10,000 square feet, rising to 10% of lot area on bigger lots. Denser zones like R-2M, R-3 and R-4 cap combined garage/carport area at 50% of the house's floor area. Exterior materials must match the main house.
Violations & Fines
Oversized garages or carports that exceed the floor-area cap, or that encroach outside the alley-setback exception, get flagged at permit review and must be resized, relocated, or removed before a building permit issues.
Frequently Asked Questions
Can I build my carport right up to the alley?
How big can my carport be?
Sources & Official References
Other rules in Anchorage
How Anchorage compares: Shed Permit Requirements by City·Compare Anchorage to another location·View the Alaska accessory structures overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.