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

$88,200-$186,200, with the median landing near $137,200. The range reflects finish tier and layout complexity within the interior conversion scope; the Las Vegas labor multiplier of 0.98× vs national median is baked in.

How long does a interior conversion scope adu take in Las Vegas?

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

Low

$88K

$88,200

Median

$137K

$137,200

High

$186K

$186,200

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

Why interior conversion × Las Vegas produces this band

A interior conversion scope for a adu in Las Vegas 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, Las Vegas runs 2% below the national median — so the interior conversion band comes in 50% below the mid-range, then scales 2% below the national median on top of that. Permit timelines for residential work in Las Vegas typically run 3-8 weeks, which is the window you plan your design and decision sequence against. This page gives you the actual 2026 Las Vegas 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 Las Vegas different

Labor — Gaming + hospitality remodel cycles create periodic labor-supply tightness — residential remodel competes with hotel refurbishment.
Labor — Summer 110°F+ heat shifts exterior trades to pre-dawn shifts.
Labor — Non-union residential market with competitive rates outside of Strip-corridor peak cycles.
Material — Desert-climate materials (reflective roofing, drip irrigation integration) are a small premium.
Material — Regional supply from LA and Phoenix distribution hubs — lead times typically short.

Las Vegas rules that affect this scope

Clark County Department of Building & Fire Prevention handles permits for unincorporated areas (most of the Strip + suburbs).
City of Las Vegas handles residential within city limits — separate process from Clark County.
Henderson and North Las Vegas each have their own building departments with distinct amendments.
Nevada State Contractors Board (NSCB) licensing required for any work over $1,000 — verify license class matches scope.

Scope your adu with Baily.

Baily asks the eight questions that determine where your project lands inside the $88K-$186K band for Las Vegas and hands the scoped brief to one licensed builder.

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Questions LA homeowners actually ask

$88,200-$186,200, with the median landing near $137,200. The range reflects finish tier and layout complexity within the interior conversion scope; the Las Vegas labor multiplier of 0.98× vs national median is baked in.