Mesa, AZ Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- RS-90/RS-43 lot coverage
- 40% maximum
- RS-9/RS-7/RS-6 lot coverage
- 60% maximum
- RS-90/RS-43 building coverage
- 25% maximum (stricter)
- RSL-3.0/RSL-2.5 lot coverage
- 80% maximum
- Governing table
- Table 11-5-3.A.1 / .A.2, § 11-5-3(A)
Summary
Mesa caps how much of a residential lot a house and its accessories can cover, with the limit rising as lots get smaller. Table 11-5-3.A.1 sets Maximum Lot Coverage at 40% in the large-lot RS-90 and RS-43 districts, up to 60% in RS-9, RS-7, and RS-6. Small-lot RSL districts run higher still, 70-80% under Table 11-5-3.A.2, per Title 11, Chapter 5, § 11-5-3(A).
Table 11-5-3.A.1: Development Standards - RS Residential Single Dwelling Districts. Standard: RS-90, RS-43, RS-35, RS-15, RS-9, RS-7, RS-6. Maximum Lot Coverage (% of lot) 40% 40% 50% 50% 60% 60% 60%. Maximum Building Coverage (% of lot) 25 25 35 40 45 45 50, Section 11-31-38, Middle Housing. Table 11-5-3.A.2: Development Standards - RSL Residential Small Lot Single Dwelling Districts. Standard: RSL-4.5, RSL-4.0, RSL-3.0, RSL-2.5. Maximum Lot Coverage (% of lot) 70% 75% 80% 80%.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 22).
Full Breakdown
Mesa's Zoning Ordinance sets two separate lot-coverage figures for single-family residential districts, and the two are not interchangeable. 1, referenced at Title 11, Chapter 5, § 11-5-3(A), lists Maximum Lot Coverage at 40% for both RS-90 and RS-43, 50% for RS-35 and RS-15, and 60% for RS-9, RS-7, and RS-6, the percentage climbing as minimum lot size shrinks from 90,000 square feet down to 6,000 square feet. The same table also carries a separate, tighter Maximum Building Coverage row, 25% in RS-90 and RS-43, 35% in RS-35, 40% in RS-15, and 45-50% in RS-9 through RS-6, cross-referenced to § 11-31-38, Middle Housing, for projects using that program's standards.
5, reflecting the smaller 2,400-4,500 square foot minimum lot sizes those districts allow. Because Mesa tracks lot coverage and building coverage as two distinct standards rather than one number, a project must check both rows for its district before sizing a house, garage, or covered patio, the building-coverage figure is consistently the more restrictive of the two and governs the footprint of roofed structures specifically.
Violations & Fines
A structure that exceeds the district's Maximum Lot Coverage or Maximum Building Coverage figure in Table 11-5-3.A.1 or 11-5-3.A.2 is not code-compliant and can be held up at plan review or cited after construction by Mesa's Planning Division; bringing the site into compliance typically means reducing paved or roofed area, or seeking a variance from the Board of Adjustment.
Frequently Asked Questions
What's the maximum lot coverage allowed on a standard Mesa single-family lot?
Is lot coverage the same as building coverage in Mesa's zoning code?
Do small-lot RSL homes in Mesa get a higher coverage allowance?
Sources & Official References
Other rules in Mesa
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