Avondale, AZ Building Setbacks & Zoning: Lot Coverage Limits (2026)

Maximum lot (building) coverage in Avondale is established in the residential dimensional standards of Chapter 28, Article 2. In the single-family districts, R1-6 and R1-8 allow a maximum building coverage of about 45 percent, while R1-10 allows about 40 percent. Multi-family districts such as R-2 and R-3 allow up to roughly 45 percent, and the higher-density R-4 district allows up to about 50 percent. These percentages limit the footprint of principal and accessory structures relative to the lot area, helping preserve open space and drainage. Importantly, Section 28-133 specifies that all accessory buildings count toward the maximum allowable lot coverage on a given lot, so detached garages, casitas, and large sheds reduce the area available for the main house. The exact coverage figure that applies depends on the parcel's zoning district and any planned-area-development standards, which may differ from the base district. Because lot coverage interacts with setbacks, height, and required landscape or open-space areas, homeowners planning additions or accessory structures should verify the controlling coverage percentage and how existing structures count against it with Avondale Development Services before designing.