What are the setback requirements in Mesa's RS districts?

Mesa's current Table 11-5-3.A.1 distinguishes the building type at the front yard. RS-9 uses 15 ft for livable area/porch/side-entry garage and 25 ft for a front-facing garage; RS-7 and RS-6 use 10 ft and 20 ft respectively. Side and rear yards also vary by district.

What is the maximum building height in Mesa RS-9, RS-7 and RS-6?

The current base maximum height is 30 ft in RS-9, RS-7 and RS-6, subject to PAD, airport, plat and other parcel-specific restrictions.

How does lot coverage vary in Mesa's common RS districts?

The current table lists maximum building coverage of 45% in RS-9 and RS-7 and 50% in RS-6. Other districts use different standards.

Can I build closer to a property line for an ADU in Mesa?

Arizona's ADU statute limits local side and rear ADU setbacks to no more than 5 ft, but Mesa placement rules, the underlying zoning district, utility easements and other site constraints still have to be checked.

Mesa Setbacks & Height Limits — Residential Zones

Fact-checked against the current Mesa Zoning Ordinance on September 20, 2026.

Mesa's current residential standards are in Title 11 of the Mesa City Code. The RS district uses designators such as RS-9, RS-7, and RS-6 to indicate minimum lot area, but the front setback is not one universal 20-foot number: the current table distinguishes livable areas and porches from front-facing garages and carports.

Current RS-9, RS-7, and RS-6 Standards

Table 11-5-3.A.1 currently provides:

Standard	RS-9	RS-7	RS-6
Minimum lot area	9,000 sq ft	7,000 sq ft	6,000 sq ft
Minimum lot width	75 ft	65 ft	55 ft
Maximum height	30 ft	30 ft	30 ft
Front — livable area / porch / side-entry garage	15 ft	10 ft	10 ft
Front — front-facing garage / carport	25 ft	20 ft	20 ft
Interior side — minimum either side	7 ft	5 ft	5 ft
Interior side — aggregate both sides	17 ft	15 ft	15 ft
Street-facing side	10 ft	10 ft	10 ft
Rear	25 ft	20 ft	20 ft
Maximum building coverage	45%	45%	50%

The previous page flattened these standards into a generic 20-ft front / 5-ft side / 15-ft street-side / 20-ft rear pattern. That is not how the current Mesa table works.

Rear and Zero-Lot-Line Exceptions

Mesa allows specified rear-yard encroachments and alley/canal measurement adjustments under the current code. RS-6 and RS-7 also allow qualifying zero-lot-line development under §11-5-3.

A parcel should therefore be checked against the full table and the additional standards immediately below it, not just the headline numbers.

Arizona ADU Law

Arizona does have statewide ADU preemption. A.R.S. §9-461.18 requires covered municipalities to allow at least one attached and one detached ADU on a lot where a single-family dwelling is allowed and limits local restrictions.

Among other things, the statute bars ADU side or rear setbacks greater than 5 ft and bars ADU height, setback, lot-size, coverage, or frontage restrictions that are more restrictive than those for single-family dwellings in the same zoning area.

Mesa's local code must therefore be read together with current state law.

How to Check a Property

Confirm the exact RS, RSL, RM, PAD, or other zoning designation.
Use the current Title 11 development table for that district.
Distinguish livable-area/porch setbacks from garage/carport setbacks.
Check alley, arterial-street, zero-lot-line, PAD, airport, and other special provisions.
Confirm parcel-specific questions with Mesa Planning before relying on a design dimension.

Official Sources

This guide is informational only. The current zoning code, state law, PAD conditions, plats, and parcel-specific approvals control.