Setbacks & Height Limits in Tucson

This guide explains the basic setback and height rules that apply to residential construction in Tucson under the city's Unified Development Code (UDC). These numbers depend on your exact zoning district, overlay zones, and lot geometry, so always confirm with the Tucson Planning and Development Services Department (PDSD) before finalizing plans.

What Are Setbacks?

A setback is the minimum required distance between a building and a lot line. Setbacks are measured from the property line to the nearest point of the building (typically the wall, but eaves, bay windows, and chimneys can have their own rules).

Tucson's UDC specifies front (sometimes called "street"), side, and rear setbacks separately for each zoning district. Corner lots have two "street" setbacks (one per street frontage) and typically one interior side and one rear. The UDC replaced Tucson's older Land Use Code in 2013 and consolidated most zoning standards into one document.

Typical Residential Setbacks

For the most common single-family residential zones in Tucson, expect approximately:

These are typical values — your specific lot and zone may have different requirements. Higher-density residential zones (R-3), mixed-use zones, and commercial zones all have separate setback schedules in the UDC. Some older neighborhoods also have "perimeter yard" rules tied to building height, where taller walls require larger side and rear setbacks.

Height Limits

Maximum building height in Tucson residential zones is typically 25-30 ft for R-1 and similar single-family zones, measured from design grade to the highest point of the roof. Multi-family zones such as R-3 allow roughly 40 ft.

Height rules get more complicated in:

• Hillside Development Zone (HDZ) — height is limited and massing is controlled to protect hillsides and views
• Airport Environs Zone (AEZ) — limits near Tucson International and Davis-Monthan AFB
• Scenic corridor overlays — along Gates Pass Road, Mount Lemmon Highway, and other designated routes
• Historic Preservation Zones — Barrio Histórico, Armory Park, El Presidio, West University, and others
• Mixed-use and commercial zones — generally allow greater height, sometimes tied to step-backs

Lot Coverage and FAR

Beyond setbacks and height, two other numbers shape how much you can build:

• Lot coverage — the percentage of the lot covered by buildings. Residential zones in Tucson typically allow around 40-50% coverage depending on the district.
• Floor Area Ratio (FAR) — the ratio of total floor area to lot area. Tucson's UDC uses FAR mainly in downtown and mixed-use zones rather than standard single-family districts.

Common Exceptions and Encroachments

Tucson's UDC allows certain features to project into required setbacks. Typical allowances include:

• Eaves and gutters (usually up to 2 ft)
• Chimneys (up to 2 ft)
• Uncovered porches, stoops, and steps
• Air conditioning condensers (subject to noise limits)
• Bay windows (limited projection)

Fences, walls, and accessory structures have separate rules in the UDC — check the accessory structures section. Tucson also has specific rules for walls in front setbacks related to visibility triangles at driveways and intersections.

State ADU Overrides

If your project is an Accessory Dwelling Unit (ADU), both city and state rules apply. Arizona HB 2720 (2024) / ARS § 9-461.18 requires municipalities over 75,000 in population — Tucson qualifies — to permit at least one attached, detached, or internal ADU on any lot where a single-family dwelling is allowed, and limits parking and design-matching mandates. Tucson addresses ADUs (sometimes called casitas or guest houses) through the UDC in conjunction with these state requirements. See the ADU rules page for details.

How to Look Up Your Specific Requirements

1. Find your zoning district — use Tucson's MapTucson/zoning map portal to look up your parcel
2. Read the district regulations — the UDC chapter for your zone lists setbacks, height, lot coverage, and any FAR
3. Check for overlays — Hillside, Airport Environs, Scenic Corridor, and Historic Preservation zones can modify the base rules
4. Ask PDSD staff — Planning and Development Services offers zoning information by phone and at the public counter before you commit to design

Variances

If your project cannot meet the strict letter of the UDC, you may apply for a variance through the Board of Adjustment — a formal request to deviate from the rules based on hardship specific to your lot. Variances are discretionary and require public hearings. See the Variance Application Guide for the general process.

Official Sources

See the sources linked in the frontmatter for the Tucson Unified Development Code and the Planning and Development Services Department. This guide is informational and is not a substitute for direct confirmation from PDSD staff.