One ZIP Filed 202 of Austin's 367 Duplex Permits in 2025

The City of Austin issued 367 building permits for new two-family buildings in 2025. Of those, 202 were issued in a single ZIP code, 78754, between March 7 and May 26. That is 55 percent of the year's count from one area, on seven streets, in under three months. Nothing like it appears in the same records for 2019 through 2024, and 78754 has issued none so far in 2026.

If you have read a headline that Austin's duplex permits "jumped" last year, this is most of the jump. The number that matters for the lot next to yours is not the citywide total, so this Sunday we looked at where the permits were.

The count, year by year

We counted City of Austin building permits (permit type BP, work class New) in the class "R- 103 Two Family Bldgs," by issue date. To compare years fairly we used the same window each time, January 1 through October 24, and split out ZIP 78754.

For the full calendar year, 2025 closed at 367: the same 202 in 78754 and 165 everywhere else. Take 78754 out and the count in these ten months runs from 64 to 139 a year, with 118 in 2025 and 125 so far in 2026. Counting all ZIPs, 2026 looks like a 61 percent drop from 2025 (125 against 320). It is not: the rest of the city is at 125 against 118 a year ago, seven permits higher.

Our own copy of the records in the Zabalist research database, last synced October 25, 2026 (permits source status "ok," newest source date October 24), also shows 125 for 2026.

What the 202 look like

The permits were issued in under twelve weeks, March 7 to May 26, 2025, and they cluster on a few dates: 51 of the 187 issued in March and April were dated March 31 alone. They sit on seven streets in the same part of 78754.

The descriptions are written by the applicant at filing, and these read alike. A typical one: "NEW CONDO REGIME - DUPLEX UNIT #A TYPE 3 (B0) 2 BED 2 BATH." Several carry a note that they are volume-builder condo duplexes. We did not look up who built them, and the records we read do not say what zoning or which city rule each one was filed under, so we make no claim about that.

One more detail matters for anyone counting. Duplexes are often permitted one side at a time. Of the 187 permits issued in March and April, 138 list one housing unit and 49 list two. So a count of permits is not a count of buildings, and a count of buildings is not a count of homes someone has moved into.

Where the rest of 2026 is

Outside the 2025 run, new two-family permits this year are spread more thinly. Of the 125 issued from January 1 through October 24, 42 are in 78745, 21 in 78703, 14 in 78744, 11 in 78721, 7 in 78704 and 6 in 78757; the rest are scattered. ZIP codes are mailing areas, not neighborhoods, and the permit address is the only thing we are counting here.

New house permits are up about 4 percent on last year, which fits the weekly counts in our October 4 piece on new houses. The accessory-use class, which covers accessory structures on a lot with a primary home, is up from 100 to 116.

This week in the permit records

That is the same set of records we read in the October 11 piece on additions and remodels and the October 18 piece on house demolitions. The one new two-family permit this week was dated October 21.

What this means if you're buying, selling or living nearby

• Read the number behind the number. A citywide "duplex permits doubled" statistic can be a single project filed in a single spring. Ask which streets, and in which months.
• A permit is permission, not a finished home. It does not say construction is complete, that the units have sold or that anyone lives there. Some of these units may still be going up; others may be done.
• Condo-regime duplexes are described differently from houses. If a permit calls a unit part of a condo regime, ownership is set by a recorded declaration and, often, an association. Before you buy, a licensed agent or real estate attorney can read those documents with you. We are not offering that as advice about any particular home.
• Check an address's own history. Permits at a street address, including the lot next door, are public. Zabalist, our sister site, keeps a permit-history search by address.
• The rule on the lot matters more than the ZIP. The City of Austin's HOME amendments allow up to three housing units on SF-1, SF-2 and SF-3 lots (adopted December 7, 2023, with applications from February 5, 2024) and a small-lot single-family use on lots of 1,800 to under 5,750 square feet (adopted May 16, 2024). Details and the current map are on the city's HOME page. The permit class alone does not tell you which rule applied.

How we counted

We used the City of Austin's open-data table "Issued Construction Permits" (dataset 3syk-w9eu on data.austintexas.gov, which showed an update on October 24, 2026), filtered to permit type Building Permit, work class New and the permit classes above, and grouped by issue date and by the ZIP on the permit address. Counts are permits, not buildings or units, and a permit can be reissued or revised after the date we counted. Data on the City's side can be corrected after we pull it, so the figures here are as of October 25, 2026. We did not use any listing or sales data.

If a permit on your block has you wondering what it means for your own plans, our research tool is a place to start with public records, and a local agent on our team can walk you through the rest.