Austin’s HOME (Home Options for Middle-income Empowerment) Initiative dramatically expanded ADU rights for Austin homeowners. If you own a single-family property in Austin, you likely have new options for building an accessory dwelling unit (ADU) that didn’t exist before 2024. Here’s what you need to know.

What the Austin HOME Initiative Changed

Up to Three Units on Most Residential Lots

The HOME Initiative, passed in December 2023 and expanded in 2024, allows up to three residential units on most single-family zoned lots in Austin. This typically means: your main house, a detached ADU, and either another ADU or a structure with two units. This was not previously allowed on standard SF-1 through SF-6 zoned properties.

Elimination of Minimum Lot Size for ADUs

Previous ADU regulations required minimum lot sizes that excluded many smaller Austin lots. The HOME Initiative removed these minimums in most cases, opening ADU development to a much larger share of Austin homeowners.

Reduced Setback Requirements

Setback requirements for ADUs were reduced under the HOME Initiative, allowing ADUs to be placed closer to rear and side property lines than previously permitted. This is critical in Austin’s often-narrow urban lots.

Austin ADU Types and What’s Buildable

Detached ADUs (DADUs)

Fully separate structures from the main house, typically 400–1,200 sq ft. Popular configurations include guest cottages, rental income units, and home office studios. TrueBuilt designs DADUs that maximize buildable area within impervious cover limits.

Garage Conversions

Converting a detached or attached garage into habitable space — either fully as an ADU or adding a unit above — is one of the most cost-effective ADU strategies in Austin. Existing structure, foundation, and utilities reduce overall project scope.

Attached ADUs

In-law suites, basement conversions, or additions attached to the main home with private entry points. Require careful design to maintain privacy between units while sharing structural systems.

What Hasn’t Changed: Impervious Cover Limits

Austin’s impervious cover limits remain one of the most important constraints on ADU development. Impervious cover includes all hard surfaces — roof area, driveways, walkways, and patios. Depending on your zoning and watershed, you may be limited to 40–45% total impervious cover on your lot. TrueBuilt calculates your site’s remaining impervious cover capacity as part of every ADU feasibility assessment.

Getting Started With Your Austin ADU

The first step is a site feasibility assessment to determine your lot’s ADU development potential under current regulations. TrueBuilt provides free ADU feasibility assessments that cover: current impervious cover usage, maximum buildable footprint, setback analysis, utility connection requirements, and estimated project scope and timeline.