Tucson limits the percentage of a lot that can be covered by buildings and impervious surfaces through the Unified Development Code. Lot coverage maximums vary by zoning district. Typical residential zones (R-1) allow up to 40% building coverage. Impervious surface coverage is also regulated to ensure adequate stormwater retention and comply with the city's water harvesting objectives.
Lot coverage includes the footprint of all structures, driveways, patios, and other impervious surfaces. The UDC establishes maximum percentages for both building coverage and total impervious coverage by zone. Higher-density residential and commercial zones permit greater coverage. Exceeding lot coverage limits typically requires a variance from the Board of Adjustment. Some coverage may be offset by providing additional stormwater retention or green infrastructure.
Exceeding lot coverage maximums without a variance will prevent permit approval. Unpermitted construction that exceeds coverage may require removal or a variance application.
Tucson, AZ
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Tucson, AZ
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Tucson, AZ
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Tucson, AZ
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Tucson, AZ
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Tucson, AZ
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Side-by-side rule comparisons with other cities in Pima County.
See how other cities in Pima County handle lot coverage limits.
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