What is the 2026 cost range for a interior conversion scope adu in Austin?

$94,500-$199,500, with the median landing near $147,000. The range reflects finish tier and layout complexity within the interior conversion scope; the Austin labor multiplier of 1.05× vs national median is baked in.

How long does a interior conversion scope adu take in Austin?

14-20 weeks of on-site construction for the interior conversion scope, plus 4-12 weeks of permit review in Austin if the scope requires a permit. Cosmetic-only refreshes often skip permits; anything touching plumbing, electrical, or structural does not.

What is the single biggest budget-overrun risk for this scope?

Existing slab without a vapor barrier — vapor-pressure moisture leads to flooring failure and mold if not re-poured or sealed. Adds $4-8K.

ADU — Interior conversion Cost in Austin, 2026

Low

$95K

$94,500

Median

$147K

$147,000

High

$200K

$199,500

Scope timeline: 14-20 weeksAustin permit window: 4-12 weeksUpdated 2026-04-24

Why interior conversion × Austin produces this band

A interior conversion scope for a adu in Austin combines two price levers: scope and metro labor rates. Interior-conversion ADUs repurpose an existing enclosed space (attached garage, basement) without adding foundation or framing footprint. Faster and cheaper than a detached build. Against the national median remodel labor rate, Austin runs 5% above the national median — so the interior conversion band comes in 50% below the mid-range, then scales 5% above the national median on top of that. Permit timelines for residential work in Austin typically run 4-12 weeks, which is the window you plan your design and decision sequence against. This page gives you the actual 2026 Austin bands for this exact combination, plus the three cost drivers Baily asks about first when scoping the project live.

What drives cost for a interior conversion scope

·Insulation and conditioned-space HVAC tie-in
·Egress window cutting and well install
·Kitchen and bath rough-ins (often net-new to the space)
·Legal separation from the primary unit

What makes Austin different

Labor — Tech-driven remodel demand has pushed labor rates above the Texas average; approaching national median.
Labor — Wet-season (spring) rain delays exterior trades.
Labor — Hill Country land demand fuels custom-home work which drains trade supply from remodel market.
Material — Limestone-heritage materials (Austin Stone, chopped limestone) carry local premium.
Material — High solar adoption (ERCOT grid economics) drives solar-ready electrical spec into remodel scopes.

Austin rules that affect this scope

City of Austin Development Services Department runs reviews — residential turnaround 4-12 weeks; land development code can add months.
Austin is on IECC 2021 + local amendments — HVAC, envelope, and water-efficiency requirements above state baseline.
Heritage tree ordinance protects trees 19" caliper+ — remodels affecting root zones require arborist sign-off.
Austin has a state-level override limit on ADU regulation but still applies design review in certain overlay districts.

Scope your adu with Baily.

Baily asks the eight questions that determine where your project lands inside the $95K-$200K band for Austin and hands the scoped brief to one licensed builder.

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Questions LA homeowners actually ask

$94,500-$199,500, with the median landing near $147,000. The range reflects finish tier and layout complexity within the interior conversion scope; the Austin labor multiplier of 1.05× vs national median is baked in.