Setbacks & Height Limits in Austin

This guide explains the basic setback, height, and floor-area rules that apply to residential construction in Austin under Title 25 of the City Code (the Land Development Code, or LDC). The numbers below are starting points — your specific lot may be subject to Subchapter F (McMansion), the HOME amendments, neighborhood plan combining districts, or other overlays. Always confirm with the City of Austin Planning Department before finalizing plans.

What Are Setbacks?

A setback is the minimum required distance between a building and a property line. Setbacks in Austin are measured from the lot line to the nearest point of the principal structure. Eaves, chimneys, bay windows, and uncovered porches have separate projection rules in the LDC.

Austin's Land Development Code specifies front, street side, interior side, and rear setbacks separately for each base zoning district. Corner lots have two front setbacks (one on each street frontage).

Typical Residential Setbacks (SF-1, SF-2, SF-3)

For Austin's three primary single-family base zones — SF-1 (Single-Family Standard Lot, 10,000 sq ft minimum), SF-2 (Single-Family Standard Lot, 5,750 sq ft minimum), and SF-3 (Family Residence, 5,750 sq ft minimum, duplexes allowed) — the base dimensional standards are:

These are the base LDC numbers. The HOME amendments (see below) and Subchapter F can both modify what is actually buildable on your lot.

Height Limits

The base maximum building height in SF-1, SF-2, and SF-3 is 35 feet, measured to the highest point of the structure under the LDC's height definition. Multi-family (MF) districts allow greater heights, generally tied to compatibility standards when adjacent to single-family zones.

Height can be further limited by:

• Subchapter F (McMansion) tent plane — slopes inward from the side setback at 15 ft above grade
• Compatibility standards — when a property is within 540 ft of a triggering single-family lot
• Hill Country Roadway, Waterfront, and Capitol View Corridors — overlay districts that cap height
• Airport overlay zones — near Austin-Bergstrom International Airport
• Neighborhood Conservation Combining Districts (NCCDs) — neighborhood-specific overrides

Subchapter F: The McMansion Ordinance

Most single-family lots inside Austin's central city are subject to Subchapter F of the LDC, popularly called the McMansion Ordinance. Subchapter F applies to SF-1, SF-2, and SF-3 (and a few other districts) within its mapped boundary and adds the following constraints on top of the base zoning:

• Floor-to-Area Ratio (FAR) cap of 0.4 — so a 7,000 sq ft lot is limited to 2,800 sq ft of countable floor area, with a 2,300 sq ft floor-area minimum allowance for smaller lots
• Tent-shaped building envelope — starting at 15 feet above average grade at the side setback line and sloping inward at 45 degrees, restricting roof bulk above the second floor
• Side wall articulation — long flat side walls must step back
• Parking placement rules — to limit garage-dominated street frontages

For most central Austin remodels and new builds, Subchapter F controls the design more than the base SF-3 dimensional standards do.

Lot Coverage and Impervious Cover

Beyond setbacks and height, Austin uses two related limits on how much of a lot can be built or paved:

• Building coverage — the percentage of the lot covered by buildings. SF-3 typically caps building coverage at 40%.
• Impervious cover — the percentage of the lot covered by buildings, paving, decks, and other surfaces that shed water. SF-3 typically caps impervious cover at 45%, with stricter limits in the Edwards Aquifer recharge zone and other environmentally sensitive areas.

Impervious cover is often the binding constraint on Austin lots because it includes driveways, patios, and pool decks in addition to the house itself.

HOME Initiative Changes (2024)

Austin City Council adopted the HOME (Home Options for Middle-income Empowerment) amendments in two phases. They significantly liberalized what can be built on SF-1, SF-2, and SF-3 lots without rezoning.

HOME Phase 1 (adopted December 2023)

• Allows up to three housing units on any SF-1, SF-2, or SF-3 lot (where previously only one principal unit plus an ADU was permitted on most lots)
• Updated impervious cover and parking standards for two- and three-unit projects
• Removed the old "unrelated adults" occupancy limit

HOME Phase 2 (adopted May 2024)

• Created a new Small Lot Single-Family Residential use category in SF-1, SF-2, and SF-3
• Lowered the minimum lot size for one unit to as small as 1,800 sq ft (down from 5,750 sq ft in SF-2/SF-3 and 10,000 sq ft in SF-1)
• Adopted a tailored set of reduced setbacks and dimensional standards for these small lots
• Made it easier to subdivide existing standard lots into two or three small lots, each with its own house

If you are evaluating an Austin lot for new construction, addition, or subdivision, the HOME rules can change the math significantly compared to the base SF-3 numbers in the table above. Read the current LDC sections and the City of Austin "Building Under HOME" info series before designing.

Common Exceptions and Encroachments

The Land Development Code allows certain features to project into required setbacks. Typical allowances include:

• Eaves and gutters (limited projection into the side setback)
• Chimneys
• Uncovered porches, stoops, and steps
• Air conditioning condensers (subject to noise rules)
• Bay windows (limited projection)

Fences, retaining walls, and accessory structures have separate rules in the LDC — check the accessory structure section for your zone.

State ADU Overrides

Texas does not have a statewide ADU mandate that overrides local zoning. Austin's ADU rules are entirely local and are written into the LDC. See the ADU rules page for current Austin-specific requirements.

How to Look Up Your Specific Requirements

1. Find your zoning district — use the City of Austin zoning map and property profile tools
2. Read the base zone section — Title 25, Chapter 25-2 of the LDC contains the base SF-1/SF-2/SF-3 standards
3. Check Subchapter F applicability — most central Austin lots are subject to the McMansion Ordinance
4. Check the HOME provisions — Phase 1 and Phase 2 amendments may give you more buildable area or unit count than the base zone
5. Check overlays and neighborhood plans — NCCDs, historic districts, and corridor overlays can modify the base rules
6. Contact Development Services — call (512) 974-2000 or use the Austin Build + Connect portal for a pre-application question

Variances

If your project cannot meet the strict letter of the LDC, you may apply for a variance from the Board of Adjustment. Variances are discretionary and typically require a public hearing and a finding of 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 Austin Land Development Code on Municode, the City of Austin Planning Department, the official Guide to Zoning, and the HOME Amendments page. This guide is informational and is not a substitute for direct confirmation from City of Austin planning staff.

Disclaimer: Austin's Land Development Code, Subchapter F, and the HOME amendments are all subject to change. Always verify current standards with the City of Austin or the Austin Land Development Code on Municode before making design or purchase decisions.