Austin considers new life-safety rules for small multifamily housing
Austin City Council approved a resolution July 23, 2026, initiating work on a proposed code amendment that could allow qualifying Houseplexes with up to four attached dwelling units to use the International Residential Code instead of the International Building Code.
The action begins a city staff review. It does not adopt a new code, establish an implementation date or change how many dwelling units Austin zoning allows on a lot.
What Austin is considering
The proposed Houseplex pathway would apply to buildings with up to four attached dwelling units, no internal common spaces or shared utilities, and no more than three stories above grade.
If the council later adopts the proposal, qualifying projects could be covered by local amendments to the 2024 International Residential Code. The July 23 action does not give builders an immediate right to use that pathway.
Austin Development Services currently says four-unit developments are classified as multifamily residential and are exempt from the site-plan process. The city’s guidance distinguishes between separate four-unit configurations, which remain under Residential Plan Review, and a fourplex in one building, which must be submitted to Commercial Plan Review or Expedited Plan Review.
Safety requirements would be part of the proposal
Any Houseplex code amendment would include specified life-safety requirements. For three- and four-unit Houseplexes, the draft resolution calls for either two-hour fire-resistance-rated assemblies between dwelling units and supporting construction, or one-hour fire-resistance-rated assemblies combined with an automatic sprinkler system based on NFPA 13D installed throughout the building.
The proposed requirements also include shared external means of egress where applicable, a prohibition on electrical receptacles in shared external means of egress, and the International Residential Code’s penetration-protection and draft-stopping requirements.
For two-unit Houseplexes, the draft says existing International Residential Code rules for two-family dwellings would apply without modification.
No zoning increase in this action
The council direction says the related building-code work must not modify, expand or otherwise affect the number of dwelling units permitted on a lot. That question remains governed by the applicable zoning district under Austin’s Land Development Code.
In practical terms, the July 23 action concerns the construction and review standards that might apply to certain small multifamily buildings if a later amendment is adopted. It does not authorize four units on a lot where zoning does not allow them.
Separate study for five to 16 units
The council separately directed the city manager to explore a simplified pathway for residential buildings containing five to 16 attached dwelling units. Those projects would remain under the International Building Code, but staff will study local amendments or alternative compliance options intended to reduce unnecessary cost and complexity while maintaining equivalent life-safety outcomes.
That five- to 16-unit study is separate from the proposed International Residential Code pathway for buildings with up to four units.
Part of Austin’s missing-middle housing work
The Houseplex work must be coordinated with Austin’s March 2026 Missing Middle initiative. City planning materials have identified building-code requirements and related technical standards as potential barriers to smaller-scale housing and have recommended examining whether some middle-scale projects could use the International Residential Code.
The July 23 direction also calls for city staff, potentially including Austin Development Services, the Austin Fire Department and the building official, to review technical-code provisions and related development-application processes. The review will examine requirements triggered by unit-count thresholds, life-safety issues and conflicts between potential International Residential Code and International Building Code pathways.
What happens next
The city manager must report back to the council by December 2026 with proposed Houseplex amendments, recommendations for five- to 16-unit projects, the technical-code review and any other code changes needed to carry out the direction.
Until the council considers and adopts a final amendment, builders, property owners and residents should treat the Houseplex pathway as a developing proposal. The next material decision will come after staff develops the language and the council considers whether to adopt it.
Sources
- Houseplex Code Amendment Draft Resolution, File ID 26-2127
- Austin Development Services Residential Plan Review
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