Boise regulates lot coverage — the percentage of a lot covered by buildings and impervious surfaces — through its Development Code (Title 11). Maximum lot coverage varies by zoning district and affects how much of a property can be developed.
Lot coverage limits are established in the dimensional standards table (Section 11-04-03) for each zoning district. Residential zones typically limit lot coverage to 40-50% of the lot area. Higher density residential and commercial zones may allow up to 80-100% coverage. Lot coverage includes all buildings, structures, and covered areas. Pervious pavement and certain green infrastructure may receive partial credit. Accessory structures count toward lot coverage. Development applications are reviewed for lot coverage compliance during plan review.
Exceeding lot coverage limits is a code violation that can prevent permit issuance. Existing properties found to exceed coverage may be considered legal non-conforming. Additions that would exceed coverage limits require a variance from the Board of Adjustment.
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See how Boise's lot coverage limits rules stack up against other locations.
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