No Tent, No Cap, Base Zoning Only
The mapped McMansion boundary covers much of greater central Austin and does not extend across the whole city. Where a north Austin property sits outside it, a replacement house is governed by the base zoning rather than by a 0.4 floor to area ratio and the setback planes.
That makes the replacement buyer considerably more competitive here than in the central neighbourhoods, because they are not building into a constrained envelope. The full position is on our page covering what the lot can hold now.
Does That Mean the Multi-Unit Route Matters Less?
HOME May Still Apply Though
An important distinction that people conflate. The two ordinances have different geographies. Subchapter F covers a mapped central boundary; HOME applies by zoning district rather than by map.
So a north Austin lot in SF-1, SF-2 or SF-3 at 5,750 square feet or above may still support up to three units by right, even though the McMansion rules never reached it. Both questions are worth asking separately rather than assuming one answers the other.
How Do I Check Both?
We publish no boundary maps or zoning conclusions for north Austin addresses. The mapped area has a specific edge and zoning varies parcel by parcel, and the city holds both answers definitively.
Post-War Construction Changes the Structural Answer
Much of this stock is frame with a brick veneer, and the veneer carries nothing. So the reasoning that governs masonry markets, where a standing shell removes the demolition, does not apply. Once fire reaches the framing behind a veneer there is no shell to preserve.
Older dimensional framing here can sometimes be repaired in sections where later engineered assemblies come out whole. Establishing which you have is the first structural question, and wall thickness at a window reveal is the usual quick check for the veneer.
And the Slab Underneath
Slab-on-grade throughout, and heat damage to a slab is invisible. It is the largest unknown on most north Austin files, and on a house where the framing points toward a rebuild, the slab is frequently the only thing standing between two very different numbers.
North Austin in Context
Where the mapped boundary applies and constrains a replacement house, see our page about the older south central streets. Where similar newer stock sits on generally larger lots, see our page for the south-eastern neighbourhoods.
The Numbers Outside the Mapped Area
Where Subchapter F does not reach, neither the 0.4 floor to area ratio nor the 2,300 square foot floor applies, and there are no planes rising 15 feet and angling in at 45 degrees. The base height in SF-1, SF-2 and SF-3 remains 35 feet.
HOME still applies by zoning district, so a north Austin lot of 5,750 square feet or more in one of those three districts may carry up to three units, an allowance open to applications since 5 February 2024. Most stock here dates from the 1950s to the 1980s.
North Austin Questions
Am I Inside the McMansion Area?
Much of north Austin is not, and the city can confirm it for your address. It changes what a replacement house may be, so it is worth knowing before comparing offers.
My House Is Brick. Does the Shell Survive?
Only if it is structural masonry, and on post-war housing here it is usually veneer over frame. The two are worth very different amounts after a fire.
Will You Buy a Smoke-Damaged Post-War House?
Yes. Smoke and water damage without structural involvement is common in this stock and among the more predictable files we price.