Anchorage, AK Building Setbacks & Zoning: Structure Height Limits (2026)

06-1 of the Municipal Code sets the R-1 Single-Family Residential District's principal structure height at 30 feet, with detached accessory garages and carports capped at 25 feet and any other accessory building limited to 12 feet. The same 30/25/12-foot pattern carries over to the R-1A, R-2A, and R-2D low-density residential districts listed in the same table. 3 spells out how that height is measured for most buildings: the vertical distance from the grade plane to the midpoint of the highest roof surface, using whichever of the existing or finished grade around the building is lower.

Structures that aren't buildings, like freestanding towers, are measured to their highest point instead. The code then carves out a list of features that don't count against the height limit at all: chimneys, spires, flagpoles, cupolas, antennas, rooftop mechanical equipment and its screening, parapets, and skylights are exempt from the height limitations, as long as they don't interfere with FAA Part 77 airspace rules and don't cumulatively cover more than a third of the roof. Even so, most of these appurtenances still can't rise more than 15 feet above the district's height limit (12 feet in the R-2A, R-2D, and R-2M districts), while flagpoles and religious spires get their own allowance of up to 30 feet in residential districts.

Dormers with a roof pitch of at least 2:12 that don't cross the main roof's ridgeline can also poke above the limit if they're stepped back at least a foot from the wall below and don't cover more than 75 percent of the roof they project from.