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

$82,800-$174,800, with the median landing near $128,800. The range reflects finish tier and layout complexity within the interior conversion scope; the Dallas labor multiplier of 0.92× vs national median is baked in.

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

14-20 weeks of on-site construction for the interior conversion scope, plus 3-8 weeks of permit review in Dallas 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 Dallas, 2026

Low

$83K

$82,800

Median

$129K

$128,800

High

$175K

$174,800

Scope timeline: 14-20 weeksDallas permit window: 3-8 weeksUpdated 2026-04-24

Why interior conversion × Dallas produces this band

A interior conversion scope for a adu in Dallas 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, Dallas runs 8% below the national median — so the interior conversion band comes in 50% below the mid-range, then scales 8% below the national median on top of that. Permit timelines for residential work in Dallas typically run 3-8 weeks, which is the window you plan your design and decision sequence against. This page gives you the actual 2026 Dallas 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 Dallas different

Labor — Non-union market with strong trade supply — labor rates 12-18% below national median.
Labor — Growing luxury remodel segment (Highland Park, University Park) drives premium-finish crew demand.
Labor — Foundation-repair demand is constant in North Texas (expansive clay soils) — pier-and-beam specialists busy year-round.
Material — Texas is a major distribution hub — most national brands have DFW warehouses, keeping lead times short.
Material — Summer thermal demand pushes HVAC sizing and spec higher than northern markets.

Dallas rules that affect this scope

City of Dallas Building Inspection Division handles permits; residential turnaround is typically 3-8 weeks.
Texas doesn't require state-level general-contractor licensing — vet GCs via BBB, references, and insurance certs.
Highland Park + University Park enforce independent municipal codes stricter than City of Dallas (setbacks, materials, height).
Flood-prone neighborhoods (Preston Hollow drainage, parts of Oak Cliff) trigger FEMA floodplain requirements.

Scope your adu with Baily.

Baily asks the eight questions that determine where your project lands inside the $83K-$175K band for Dallas and hands the scoped brief to one licensed builder.

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Questions LA homeowners actually ask

$82,800-$174,800, with the median landing near $128,800. The range reflects finish tier and layout complexity within the interior conversion scope; the Dallas labor multiplier of 0.92× vs national median is baked in.