Remodelling in Austin: does the whole house have to meet current code?

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

You must meet current technical code requirements for an addition, alteration or repair — but §25-11-33(D) does not require you to conform the portions of the existing building your work does not affect. You may not create a violation or an unsafe condition.

Applies to: Additions, alterations and repairs to existing buildings and building service equipment. An addition increasing floor area by 50% or more also triggers a sidewalk requirement.

You bring the work up to code, not the house

This is the question every remodel client asks, and the code answers it in two sentences that sit four subsections apart.

§25-11-33(A) — you must comply with technical code requirements for new facilities when making an addition, alteration or repair.

§25-11-33(D) — you are not required to conform the portions of the existing building not affected by that addition, alteration or repair.

So the line is scope, not building. Touch a wall and that wall meets current code; leave the rest alone and the rest stays as it is. Adding a bedroom does not oblige you to rewire the house.

Two things you may never do, regardless of scope. §25-11-33(E): you may not create a condition that violates the technical codes as a result of the work. §25-11-33(F): you may not create an unsafe condition. Those override the "only what you touch" principle — the exemption is for leaving existing conditions alone, not for making them worse.

What counts as an unsafe condition

§25-11-33(F) does not leave it to judgment. An unsafe condition exists if the addition or alteration:

causes the existing building or structure to become structurally unsafe;
overloads or exceeds the capacity of building service equipment;
results in inadequate egress or obstructs existing exits;
creates a fire hazard;
reduces fire resistance; or
creates a health hazard or a condition dangerous to human life.

The second is the one that catches otherwise sensible remodels. Adding conditioned floor area to a house whose existing service equipment is already at capacity creates an unsafe condition even though nothing about the new work is defective — which is why the mechanical and electrical load calculation belongs early in an addition, not at inspection.

Three reliefs, all discretionary

§25-11-33(B) lets the building official — note may, not shall — allow three departures:

a minor addition, alteration or repair to existing building service equipment under the technical codes in effect when the equipment was originally installed;
continuing to use, maintain or repair equipment that was lawfully in existence when the technical codes were adopted, in accordance with its original design — provided it does not create a hazard to life, health or property; and
using the type of materials used in the original construction for a nonstructural alteration or repair, provided it does not adversely affect a structural member or required fire resistance.

That third one is what allows sympathetic repair of an older house without importing modern assemblies. It is a discretion, though, not a right — worth confirming rather than assuming on anything load-bearing or fire-rated.

Glass is the flat exception. §25-11-33(C) has no discretion in it: when installing or replacing glass you must comply with the requirements for new installations. Whatever was there before is irrelevant. On an older house this is often the first place a remodel meets current code whether the owner intended it or not.

The 50% threshold that brings other rules with it

Scope also has a downstream consequence outside Chapter 25-11. Under §25-6-353, an addition that increases the building's gross floor area by 50% or more triggers the sidewalk requirement — the same as a new build.

A fee in lieu is often available, and for a one- or two-unit residential property on an older block it may be mandatory rather than discretionary. But the cost belongs in the budget at the point the addition crosses half the existing floor area, not at certificate of occupancy.

One more signal worth noticing: §25-11-63 lists residential remodeling of a complying structure and residential remodeling of or additions to a noncomplying structure as separate permit types with separate deadlines. If your house is legally nonconforming, expect it to be handled on a different track.

Where remodel scope creeps

The honest pattern: work that starts as "we are only touching the kitchen" reaches a structural member, and at that point the structural work is new work and meets current code. That is not the City being difficult — it is §25-11-33(A) applying to the thing you actually touched.

We price the service equipment question early on any addition. Capacity is the most common route to an unsafe condition finding, and it is the one where the fix is expensive and unglamorous.

And we flag the 50% floor area line to clients before design settles, because it is the difference between a remodel and a project that carries new-build obligations on the footpath outside.

Common questions

Does remodelling in Austin mean bringing the whole house up to code?

No. §25-11-33(D) provides that you are not required to conform the portions of the existing building not affected by the addition, alteration or repair. The work itself must meet current requirements.

Can an Austin remodel be refused for making the house unsafe?

Yes. §25-11-33(F) prohibits creating an unsafe condition, defined as work that makes the building structurally unsafe, overloads building service equipment, results in inadequate egress, creates a fire hazard, reduces fire resistance, or creates a health hazard.

Do I have to replace old windows to current standards in Austin?

If you are installing or replacing glass, yes. §25-11-33(C) requires compliance with the requirements for new installations, with no discretion.

Can I repair an old Austin house using its original materials?

The building official may allow it for a nonstructural alteration or repair, provided it does not adversely affect a structural member or required fire resistance. It is discretionary under §25-11-33(B)(3), not automatic.

When does an Austin addition trigger a sidewalk requirement?

When it increases the building's gross floor area by 50% or more, under §25-6-353(A). A fee instead of installation may be available, and is mandatory in some cases for one- and two-unit residential properties.

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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.