Austin annexed-lot setbacks and the SMART Housing small-lot route

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

On a lot annexed after 1 December 1997 and platted before the city reached it, the minimum front setback is the greater of the platted setback or 15 feet. Separately, SF-2 and SF-3 developments over three acres may use SF-4A regulations if certified under S.M.A.R.T. Housing.

Applies to: Section 25-2-565 applies to RR, SF-1, SF-2 and SF-3 lots annexed after 1 December 1997 and platted before the city reached them. Section 25-2-566 applies in SF-2 and SF-3 districts.

Annexed lots: the plat can set your setback

Austin annexed a great deal of land after 1997, and much of it had already been platted under county rules. §25-2-565 deals with the mismatch.

It applies to a lot in RR, SF-1, SF-2 or family residence zoning that was annexed after 1 December 1997 and sits in a plat either recorded while the lot was outside the zoning jurisdiction, or recorded before 7 September 1998.

Where that plat establishes a setback:

Front yard — the greater of the platted setback or 15 ft.
Street side yard — the greater of the platted setback or 10 ft.

Note the direction — this one is "greater of". The front yard averaging rule at §25-2-778 is a lesser of rule and can only reduce your setback. §25-2-565 works the other way: it sets a floor beneath the platted figure, so a plat showing a 10 ft front setback still yields a 15 ft requirement. Two similar-looking sections, opposite effects.

What that means in practice

A county plat with generous setbacks keeps them — the plat figure is greater, so the plat governs. A county plat with shallow setbacks does not: the section imposes 15 ft front and 10 ft street side as a minimum regardless.

So the useful question on an annexed lot is not "what does the plat say" but "is the plat figure above or below the floor". Only one of those two answers leaves the plat in control.

SMART Housing: SF-4A rules on SF-2 or SF-3 land

§25-2-566 is short and does one thing. In an SF-2 or SF-3 district, a development may comply with SF-4A site development regulations instead — a materially smaller-lot regime — if two conditions hold:

the development is on three or more acres of previously unsubdivided land; and
the director of the Neighborhood Housing and Community Development Department certifies compliance with the City's S.M.A.R.T. Housing Program.

"Previously unsubdivided" is doing real work. This is a route for bringing new land into development at higher density in exchange for affordability, not a way to re-cut an existing subdivision.

The qualifying criteria live elsewhere. §25-2-566 states the zoning consequence but defers entirely to the S.M.A.R.T. Housing Program for what earns certification. We do not hold that program as a source, so treat this page as telling you the prize rather than the price.

When these two come up

§25-2-565 turns up on the edges of the city, on lots whose plats predate Austin's jurisdiction. It is worth checking before assuming the standard 25 ft front setback applies — and equally before assuming a shallow county setback survives.

§25-2-566 is a larger-site tool. On three-plus acres of unsubdivided SF-2 or SF-3 land, the SF-4A regime changes the arithmetic enough to be worth pricing the S.M.A.R.T. Housing obligations against. Below three acres, or on land already subdivided, it simply is not available.

Common questions

My Austin lot was annexed — which setback applies?

If it is RR, SF-1, SF-2 or family residence zoning, was annexed after 1 December 1997 and sits in a qualifying plat, the front setback is the greater of the platted figure or 15 feet, and the street side is the greater of the platted figure or 10 feet.

Can a plat setback be smaller than the code minimum in Austin?

Not under §25-2-565. It takes the greater of the two, so the 15 ft front and 10 ft street side act as a floor beneath the platted figure.

Can I use SF-4A rules on SF-3 land in Austin?

Yes, under §25-2-566, if the development is on three or more acres of previously unsubdivided land and the housing department certifies compliance with the S.M.A.R.T. Housing Program.

Does the SMART Housing route work on land already subdivided?

No. §25-2-566 requires three or more acres of previously unsubdivided land.

Send us an address and we will tell you what we find

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.