Austin Building Atlas

Apartment complexes and condo buildings in Travis, Williamson and Hays counties, from public records, October 2026

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About this data · Data quality: Good, most unit counts exact

Sources

  • Travis, Williamson and Hays Central Appraisal Districts: 2026 appraisal rolls, which are public records. They give property type, owner, value, floor area, year built and business name.
  • City of Austin open data: 2026 multifamily unit counts for every complex inside the city (Universal Recycling Ordinance dataset), joined on the appraisal property ID.
  • Texas condo management certificate register (public records, hoa.texas.gov): each condo association's filing, which names its manager or a mailing address.
  • US Census Bureau geocoder and TIGER boundaries (public domain): locations, city and county lines.
  • OpenStreetMap (ODbL) and Overture Maps: extra names, floors and fallback locations.

Quality

  • Every property comes from the official tax roll, so what is listed is real and current to 2026.
  • 72% of unit counts are exact: from the City of Austin's own count, the appraisal record or counted condo units. The other 28%, mostly outside Austin city limits, are estimated as floor area ÷ 753 sq ft, a figure calibrated on 1,264 complexes with an exact count.
  • 222 condo buildings are linked to their registered condo association and its management certificate.
  • Names are good (93%, from the business name the district recorded) but can be out of date after a rebrand.
  • 96% are on the map. Census geocodes are interpolated along the street and can be off by a block.

How complete is the data?

Good for the three core counties: the appraisal roll lists every taxable property, so few apartment complexes should be missing. Gaps: Bastrop and Caldwell counties are not included; buildings under 5 units, townhomes and duplexes are left out by design; some publicly owned or tax-exempt housing may be missing. Exact unit counts are strongest inside the City of Austin; suburbs in Williamson and Hays rely more on estimates. Apartment management companies are not included: Smart Apartment Data (about $2,100 a year) is the cheapest source for those.

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Sources: Travis, Williamson and Hays central appraisal districts, 2026 appraisal rolls (public records) · US Census Bureau Geocoder and TIGER boundaries (public domain) · © OpenStreetMap contributors, ODbL · Overture Maps places, CDLA-Permissive-2.0. Unit counts marked "estimated" are floor area divided by 950 sq ft.