Austin MF-2 zoning: where the code contradicts itself

Last verified August 5, 2026 against the Austin Land Development Code · Kimbrough Gray · KiliGray Homes

MF-2 is the one multifamily district whose designation text does not reconcile with its own site area schedule. §25-2-63 states up to 23 units per acre; the efficiency-unit row of the site area schedule implies 27.2. We design to the stricter figure, 23 — it governs. For a one-bedroom or two-bedroom scheme the schedule is already below 23 anyway, so the gap only matters for an all-efficiency building.

Applies to: Property zoned MF-2. Compatibility standards, overlays and watershed rules apply on top, and the site development regulations and density-bonus provisions covered on the multifamily pillar page apply here too.

Where the designation and the schedule disagree

§25-2-63 describes MF-2 as the designation for "a multifamily use with a maximum density of up to 23 units per acre, depending on unit size."

§25-2-561(B) sets the minimum site area for an MF-2 dwelling unit at 1,600 square feet for an efficiency unit — the smallest unit type in the schedule, and the row that produces the largest number of units on a given site.

One acre is 43,560 square feet. Divide that by the 1,600 sq ft efficiency minimum:

43,560 ÷ 1,600 = 27.2 units per acre.

That is the same arithmetic — schedule minimum divided into one acre, efficiency row — that produces the figure named in every other MF designation. Applied to MF-2 it gives 27.2, not 23. We treat 23, the lower figure named in the designation, as the number that governs — the arithmetic below is worth reading in full before drawing any other conclusion from it.

Unit type	Minimum site area, §25-2-561(B)	Implied units per acre	Below the designated 23?
Efficiency	1,600 sq ft	27.2	No
One bedroom	2,000 sq ft	21.8	Yes
Two or more bedrooms	2,400 sq ft	18.2	Yes

Implied units per acre = 43,560 sq ft ÷ minimum site area for that unit type. Only an all-efficiency building reaches a figure above the designated 23. A one-bedroom building tops out at 21.8 units per acre and a two-or-more-bedroom building at 18.2 — both already below 23 on the schedule alone, before the discrepancy above is even reached.

For most real projects, this is academic. Almost no MF-2 project is built entirely of efficiency units. The moment a scheme includes any one-bedroom or larger units, the site area schedule itself caps density below 23 units per acre — the 27.2 figure only becomes reachable on an all-efficiency building, which is exactly where the more conservative reading matters most.

The other four districts reconcile

Run the same arithmetic on every other multifamily designation and it checks out. MF-1, MF-3, MF-4 and MF-5 — the table below shows the working for each: designation text, the schedule minimum it corresponds to, and the units-per-acre that minimum implies. In every one of those four cases the implied figure lands on the number named in the designation, once rounded.

District	Designation text	Schedule minimum	Implied units/acre	Reconciles?
MF-1	§25-2-62: "up to 17 units per acre"	2,500 sq ft (efficiency), §25-2-560(B)	17.4	Yes
MF-3	§25-2-64: "up to 36"	1,200 sq ft (efficiency), §25-2-562(B)	36.3	Yes
MF-4	§25-2-65: "36 to 54"	1,200 sq ft (2+ bed) to 800 sq ft (efficiency), §25-2-563(B)	36.3 to 54.5	Yes
MF-5	§25-2-66: "up to 54"	800 sq ft (efficiency), §25-2-563(B)	54.5	Yes
MF-2	§25-2-63: "up to 23"	1,600 sq ft (efficiency), §25-2-561(B)	27.2	No

Implied units per acre = 43,560 sq ft ÷ schedule minimum, using the same efficiency-unit row throughout. MF-1, MF-3, MF-4 and MF-5 all land within rounding of their designation text. MF-2 does not, and is included here for contrast.

MF-4 is the clearest confirmation. Its designation states a range rather than a single ceiling — §25-2-65 says "36 to 54 units per acre" — and §25-2-563(B), the shared MF-4/MF-5 schedule, produces exactly those two ends: 36.3 from the two-or-more-bedroom row, 54.5 from the efficiency row. A designation stating a range and a schedule producing that same range from its two extreme rows is about as clean a match as this kind of derived figure gets. MF-2 is the only one of the five where the same method does not land on the stated number.

Which number we design to

Twenty-three units per acre. That is the figure we design to on MF-2 land, without exception. Nothing in the code we could locate says which of the two numbers controls when a district's designation and its site area schedule disagree, so this is our practice rather than a rule the code states outright: take the stricter of the two figures named anywhere in the code, and do not treat the schedule's higher, 27.2 figure as available capacity.

In practice this rarely changes anything. As the table above shows, the site area schedule at §25-2-561(B) already caps a one-bedroom building at 21.8 units per acre and a two-or-more-bedroom building at 18.2 — both under 23 on their own, before the designation is even consulted. The 23-versus-27.2 question only arises for an all-efficiency building, and that is exactly the case where we hold to 23 rather than the schedule's higher figure.

The practical sequence: run the site area schedule against the actual unit mix first, and cap the result at 23 units per acre if that schedule math would otherwise exceed it. Then check the rest of the §25-2-492 envelope — height, setbacks, building coverage, impervious cover — since those bind independently of the density question and often set the real ceiling before density does.

Common questions

How many units per acre does MF-2 zoning allow in Austin?

Twenty-three. §25-2-63 describes MF-2 as "up to 23 units per acre," and that is the figure to design to. The site area schedule at §25-2-561(B) implies a higher number, 27.2, for an all-efficiency building, but we treat 23, the more conservative figure named in the code, as the one that governs.

Why does the MF-2 designation say 23 units per acre when the schedule implies 27.2?

The designation in §25-2-63 was last amended by an ordinance from 2003. The site area schedule in §25-2-561 was amended again in December 2011. The regulation changed; the description of it in the designation section was not updated to match. The 27.2 figure is not a limit to plan toward — 23 is.

Do the other Austin multifamily districts have this problem?

No. MF-1, MF-3, MF-4 and MF-5 all reconcile: their designation text matches the units per acre implied by their site area schedules, within rounding. MF-2 is the only one that does not, and 23 is the figure we hold to there.

Which number should I use to plan an MF-2 project in Austin?

23 units per acre. Run the site area schedule at §25-2-561(B) against your actual unit mix, and cap the result at 23 if the schedule math comes out higher. For anything other than an all-efficiency building the schedule is already below 23, so this mostly does not come up in practice — but the 23 figure governs when it does.

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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.