Anchorage, AK Fence Regulations: Retaining Walls (2026)
Key Facts
- Permit-exempt height
- 4 ft retained soil or less
- Exempt wall top cap
- 1 foot above soil
- Design standard
- IBC Section 1807.2
- Permit issuer
- MOA Building Official
Summary
Anchorage requires a grading permit for isolated retaining walls once the retained soil exceeds 4 feet, and taller or engineered walls must meet International Building Code design standards.
A grading permit issued under this chapter shall include isolated retaining walls, but does not include other structures, or any retaining walls connected to another structure. ... An isolated retaining wall not supporting a surcharge where the retained height measured from the bottom of the footing to the top of the retained soil at the face of the wall is not more than 4 feet (1,219 mm) and the top of the wall above the retained soil is not more than 1 foot (305 mm).
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
Under AMC Chapter 23.105, a grading permit issued by the building official covers isolated retaining walls, but a wall connected to another structure needs its own building permit instead. Walls stay exempt from a grading permit only if the retained height (footing to top of retained soil) is 4 feet or less and the wall's exposed top above the soil is no more than 1 foot. Anything bigger must be designed to IBC Section 1807.2 and is subject to municipal inspection.
Violations & Fines
Building a retaining wall over the 4-foot exemption threshold without a grading permit, or building on a stacked/terraced system that exceeds the aggregate exemption, exposes the owner to a stop-work order and required after-the-fact permitting and inspection by the Building Safety Division.
Frequently Asked Questions
Do I need a permit for a retaining wall in Anchorage?
What if I connect the wall to my house or garage?
Sources & Official References
Other rules in Anchorage
Compare Anchorage to another location·View the Alaska fence regulations overview
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