Setbacks & Height Limits in Aurora

This guide explains the basic setback and height rules that apply to residential construction in Aurora, Colorado. These numbers depend on your exact zoning district, overlay zones, and lot geometry, so always confirm with the City of Aurora Planning Department 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 projection rules).

Aurora's Unified Development Ordinance (Chapter 146 of the Municipal Code) specifies front, side, and rear setbacks separately for each zoning district. Corner lots have two "front" setbacks (one per street frontage) and typically one interior side and one rear.

Typical Residential Setbacks

For Aurora's most common residential zones, expect approximately:

These are the base values from Chapter 146 — your specific lot may have different requirements based on overlay districts, Planned Development (PD) site plans, or Transit-Oriented Development (TOD) standards near light rail stations. Higher-density R-4 and R-5 zones, and the B-series business districts, each have their own setback schedules.

Height Limits

Maximum building height in Aurora's R-1 single-family zone is 35 ft, measured from average grade to the highest point of the roof. Medium-density R-3 districts allow 40 ft, and higher-density multi-family zones permit taller buildings.

Height rules get more complicated in:

• Transit-Oriented Development (TOD) districts — stations along the R Line and I-225 corridor have tailored height allowances to encourage dense, walkable development
• Planned Development (PD) zones — height is set by the approved PD site plan rather than the base district
• Airport influence overlays — parts of Aurora near Buckley Space Force Base and approach paths have FAA-driven height restrictions
• Mixed-use and commercial zones — generally allow greater height, often tied to site design

Lot Coverage

Beyond setbacks and height, lot coverage shapes how much of your lot can be built on:

• Lot coverage — the percentage of the lot covered by principal and accessory buildings. Aurora's residential districts typically cap coverage in the 35%–50% range, depending on the specific zone.

Uncovered patios, driveways, pools, and similar hardscape are usually excluded from the coverage calculation, but each zone has its own definition — check Chapter 146 for your district.

Common Exceptions and Encroachments

Aurora's zoning code 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 sound limits)
• Bay windows (limited projection)

Fences, retaining walls, and accessory structures have separate rules — check the accessory structure section of Chapter 146.

State ADU Overrides

If your project is an Accessory Dwelling Unit (ADU), Colorado HB 24-1152 establishes baseline ADU rights that Aurora must honor. Detached ADUs in Aurora are capped at 900 sq ft and 22 ft in height, with 5 ft rear and side setbacks. See the ADU rules page for full details.

How to Look Up Your Specific Requirements

1. Find your zoning district — use the City of Aurora online zoning map through the Planning Department website
2. Read the district regulations — Chapter 146 of the Aurora Municipal Code lists setbacks, height, and lot coverage by district
3. Check for overlays — TOD districts, PD plans, airport overlays, and floodplain overlays can modify the base rules
4. Ask planning staff — Aurora Planning & Development Services at (303) 739-7250 offers zoning information to residents and applicants

Variances

If your project cannot meet the strict letter of the zoning code, you may apply for a variance from Aurora's Board of Adjustment — a formal request to deviate from the rules based on hardship unique to your lot. Variances are discretionary and require a public hearing. See the Variance Application Guide for the general process.

Official Sources

See the sources linked in the frontmatter for the Aurora Unified Development Ordinance and Planning & Development Services. This guide is informational and is not a substitute for direct confirmation from planning staff.

Disclaimer: This guide is for informational purposes only. Zoning rules change, and site-specific conditions matter. Always verify current requirements with the City of Aurora Planning Department before making design or investment decisions.