Setbacks & Height Limits in Denver

This guide explains the basic setback and height rules that apply to residential construction in Denver. Because Denver uses a form-based zoning code (adopted in 2010), the numbers depend not only on your zone district but also on the building form you are using — Urban House, Suburban House, Detached Accessory Dwelling Unit, Tandem House, Row House, and so on. Always confirm with Denver Community Planning and Development before finalizing plans.

What Are Setbacks?

A setback is the minimum required distance between a building and a lot line. In Denver, setbacks are measured from the property line to the nearest point of the building wall. The zoning code uses four setback categories:

• Primary Street — the front setback along the street the house faces
• Side Street — the secondary street setback on a corner lot
• Side Interior — the setback to an interior (non-street) side lot line
• Rear — the setback to the rear property line (often the alley in Denver)

Typical Residential Setbacks — Urban House Form in E-SU-D

For the most common single-family residential zone (E-SU-D, Urban Single Unit D, which covers large areas of central Denver's bungalow neighborhoods), the Urban House building form typically requires:

Suburban context zones (S-SU-D, S-SU-F, etc.) generally use a similar front setback of 20 ft but allow slightly different side and rear dimensions. Higher-density zones (Two Unit, Row House, Multi Unit) have their own setback schedules keyed to each building form in Articles 4 through 7 of the Denver Zoning Code.

Height Limits

For the Urban House building form in E-SU-D, the maximum height is roughly 30 to 35 ft, depending on the specific district and roof type. Height is measured from the average ground elevation around the building footprint to the midpoint of a sloped roof (flat roofs are measured to the top of the parapet).

Height rules change in:

• Suburban context zones — similar numeric caps but different bulk plane geometry
• Two Unit, Row House, and Multi Unit zones — generally allow more height
• Mixed Use and Main Street zones (MX, MS) — 45 to 75 ft or more, depending on sub-district
• Downtown (D-C, D-LD, D-TD) — height is regulated by separate downtown form standards
• Design review and historic districts — Denver's landmark districts and design overlays can further restrict height and massing

Bulk Plane Rule

Denver's bulk plane is one of the defining features of its form-based zoning code and deserves its own section. In addition to the flat height maximum, each side interior property line has an imaginary angled plane that starts at a fixed height on the property line and slopes inward and upward.

For most Urban House and Suburban House forms, the bulk plane:

1. Starts at a fixed height on the side interior property line — commonly 10 ft above the reference grade
2. Slopes inward at 45 degrees toward the center of the lot
3. Caps the allowed building envelope — no part of the house (other than permitted projections like chimneys and vents) may extend above this sloped plane

In practice, the bulk plane means that a two-story house cannot have tall vertical walls right next to the neighbors — the upper story must step back toward the center of the lot or use a pitched roof that fits under the plane. This is why many new Denver homes show a characteristic sloped upper story or deep setback on the second floor.

The exact bulk plane height and angle vary slightly by zone district, so read the building form standards in the article for your specific zone.

Lot Coverage and Unit Density

Beyond setbacks, height, and bulk plane, Denver controls building mass through:

• Maximum building coverage — Urban House zones typically allow the primary structure plus accessory structures to cover no more than about 37.5 to 50 percent of the zone lot, depending on district. Suburban context zones tend to be lower.
• Minimum zone lot size — E-SU-D requires a minimum zone lot of 5,500 sq ft; other SU districts range from 3,000 sq ft (E-SU-A) up to 9,000 sq ft (E-SU-F/G).
• Maximum units — Single Unit zones allow one primary dwelling plus one ADU; Two Unit zones allow two primary dwellings plus an ADU.

Denver does not generally use a numeric FAR (Floor Area Ratio) in residential Single Unit zones — building size is instead controlled by the combination of setbacks, bulk plane, height, and building coverage.

Common Exceptions and Encroachments

The Denver Zoning Code allows certain features to project into required setbacks, subject to limits in the general rules sections:

• Eaves, gutters, and cornices (limited projection)
• Chimneys and flues
• Uncovered porches, stoops, and stairs
• Bay windows and cantilevered upper-story elements (limited)
• Mechanical equipment such as condensers (subject to noise rules)

Fences and retaining walls are regulated separately — residential front-yard fences are typically limited to about 4 ft in height, and side/rear fences to about 6 ft.

State ADU Overrides

Colorado's HB 24-1152 requires certain cities to permit ADUs in single-family zones. Denver already permits ADUs under its own zoning code, and detached ADU building forms have their own setback schedule — typically 5 ft side and rear, with a height cap around 24 ft for a pitched-roof detached structure. See the Denver ADU rules page for the current building form standards.

How to Look Up Your Specific Requirements

1. Find your zone district — use the Denver Zoning Map from Community Planning and Development
2. Read the building form standards — go to the article for your neighborhood context (e.g., Article 5 for Urban) and find your zone's Single Unit, Two Unit, or other building form table
3. Check the bulk plane diagram — each district's form section includes a diagram showing the bulk plane geometry
4. Look for overlays — design overlay districts, conservation overlay districts, and historic districts can modify the base rules
5. Call CPD zoning — (720) 865-2705, or visit the planning counter for a zoning verification

Variances

If your project cannot meet the strict letter of the Denver Zoning Code, you may apply to the Denver Board of Adjustment for Zoning Appeals for a variance. Variances in Denver are discretionary and require demonstrating a hardship specific to your lot. See the Variance Application Guide for the general process.

Official Sources

See the sources linked in the frontmatter for the Denver Zoning Code on Municode and the Community Planning and Development department. This guide is informational and is not a substitute for a zoning verification from Denver CPD.