The Barton Springs Zone overlay: a size cap on retail buildings

Last verified August 7, 2026 against the Austin Land Development Code · Kimbrough Gray · KiliGray Homes

The Barton Springs Zone overlay district caps a principal retail use and its accessory uses at 50,000 sq ft of gross floor area, and a principal food sales use at 100,000 sq ft. It is a zoning limit, separate from the watershed water-quality regulations.

Applies to: Property in the Barton Springs Zone (BSZ) overlay district, with exceptions for certain retail uses settled or zoned before December 2003.

Two different things share this name

Before anything else: "Barton Springs Zone" means two separate regimes in the Austin code, and they do unrelated jobs.

The Barton Springs Zone watershed rules in Chapter 25-8 — water quality, impervious cover, critical water quality zones.
The Barton Springs Zone (BSZ) overlay district at §25-2-651, in the zoning chapter — which caps the size of retail buildings.

Knowing the watershed rules tells you nothing about the overlay, and vice versa.

The caps

The overlay is, in substance, a big-box limit over the recharge zone:

a principal retail use and its accessory uses may not exceed 50,000 sq ft of gross floor area;
a principal food sales use and its accessory uses may not exceed 100,000 sq ft.

Note that both figures include accessory uses. The cap is on the whole principal-plus-accessory package, not on a single tenancy.

"Retail use" is defined for this section specifically. §25-2-651(C) enumerates what counts, and the list is broader than the everyday sense of the word — it reaches agricultural sales and services, art galleries and drive-in or fast-food restaurants among others. Check the list against your actual use rather than assuming.

What happens to buildings already over the cap

A principal retail use that already exceeded these limits on 16 December 2003 is not frozen. It may be changed to another retail use — provided the existing impervious cover is not increased.

That is a sensible trade: the building stays, the use can turn over, but the site cannot get any harder. It ties the zoning overlay back to the water-quality purpose the whole zone exists for.

The December 2003 carve-outs

The section does not apply at all to a retail use on property that, before 6 December 2003, was:

subject to a settlement agreement adopted by council prescribing development regulations;
zoned as a planned unit development; or
subject to a site plan approved as a condition of zoning.

These are historic and site-specific. You cannot tell from the code whether a given property falls into one — it is a title and zoning-history question.

What this means on a Barton Springs site

For a residential project the overlay is largely irrelevant — it is aimed at retail scale. Where it bites is commercial redevelopment on the recharge zone, and there the 50,000 sq ft figure is a hard planning constraint rather than a negotiable one.

The impervious cover condition on changing an over-cap use is the interesting lever. It means an older oversized building can find a new retail tenant, but any scheme that adds parking or hardstanding to make that work fails the test.

And do not read this page as covering the water quality rules. Those are the ones that usually decide whether a Barton Springs site works at all, and they live in Chapter 25-8.

Common questions

How big can a retail building be in the Barton Springs Zone?

A principal retail use and its accessory uses may not exceed 50,000 sq ft of gross floor area. A principal food sales use and its accessory uses may not exceed 100,000 sq ft.

Is the Barton Springs Zone overlay the same as the watershed rules?

No. The overlay at §25-2-651 is a zoning district capping retail building size. The watershed rules in Chapter 25-8 govern water quality, impervious cover and critical water quality zones. They share a name and nothing else.

What if a building already exceeds the Barton Springs retail cap?

A principal retail use that exceeded the limits on 16 December 2003 may change to another retail use, provided existing impervious cover is not increased.

Are there exemptions from the Barton Springs overlay?

Yes, for retail use on property that before 6 December 2003 was subject to a council settlement agreement prescribing development regulations, zoned as a planned unit development, or subject to a site plan approved as a condition of zoning.

Does the Barton Springs overlay affect houses?

Its size caps are aimed at retail and food sales uses, so a residential project is generally unaffected by this section — though the watershed rules certainly apply.

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We do this research ourselves on every project we take on — zoning, floodplain, watershed, trees, whether it is a legal lot. Send us an address and we will run it and tell you what we find. It works the same whether you own a vacant lot, a house you are thinking of adding a unit to, or a house you are thinking of replacing. No charge and no strings, and if it is a bad lot we will say so.

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We are homebuilders, not the City of Austin. This page explains how we read the code in practice — it is not legal advice and it is not an official determination. Always confirm with Austin Development Services before you rely on it for a project. The authoritative text is the Austin Land Development Code; permitting questions go to Austin Development Services Department.