Garage Conversion ADU in Whitney, NV: Timeline, Cost, and What to Expect
Garage Conversion ADU in Whitney turns an existing attached or detached garage into a permitted, habitable dwelling unit with its own kitchen, bath, and living space. Most conversions we complete in the 89122 ZIP run 8-14 weeks from permit pull to final inspection, with typical project costs falling between $45,000 and $130,000 depending on what’s already there and what needs to change. Call (855) 951-4361 for a free on-site estimate and written quote.
How We Convert a Garage to an ADU - Start to Finish
We’ve refined this process across dozens of conversions in unincorporated Clark County. Here’s exactly how your project moves, what happens when, and where your decisions matter.
Stage 1: Site Evaluation and Feasibility (Days 1-5)
We walk the garage with you, measure every inch, and photograph the existing slab, roof structure, electrical panel, and any plumbing stub-outs. In Whitney, we always check whether your home sits on a post-tension slab - this single fact determines whether we can cut for drain lines or need to design around the existing floor plate. You’ll decide at this stage whether you want a full kitchen or a kitchenette, and whether the unit needs its own meter or will sub-meter from the main house.
Stage 2: Design, Plans, and County Permitting (Weeks 2-5)
Because Whitney is unincorporated Clark County, all permits route through the Clark County Building Department, not City of Las Vegas. Their review queue for ADU conversions typically runs 2-3 weeks for plan check, longer if fire separation or structural modifications trigger a secondary engineering review. We handle the full plan set: architectural, structural, MEP, and energy compliance. Your only task here is selecting finishes and confirming the layout - we’ll flag any choice that adds review time.
Stage 3: Demolition and Rough Prep (Week 6-7)
We strip the garage to studs, remove the overhead door and frame in a proper entry wall with rated fire separation if the garage is attached. For detached structures common on larger Whitney lots, we assess whether the existing slab meets ADU living-space standards - many 1970s-1980s garage slabs were poured thin without vapor barriers or insulation, which means either overlay or replacement. If we’re cutting the slab for plumbing, we bring in a post-tension scanning specialist first. No exceptions.
Stage 4: Systems and Enclosure (Weeks 8-11)
Electrical service upgrade if needed (many Whitney homes still run 100-amp panels), plumbing rough-in, HVAC mini-split or extension, insulation, drywall, and flooring. We work morning shifts during July and August when possible - concrete and stucco can’t handle 110°F afternoons, and our crews won’t either. You’ll do a walkthrough at rough-in to confirm outlet locations and fixture placements before we close walls.
Stage 5: Finish, Inspection, and Final Punch (Weeks 12-14)
County inspections happen at rough and final for electrical, plumbing, and structural. Clark County’s inspectors know Whitney’s housing stock well - they check post-tension cable clearances, fire-rated assemblies between units, and egress window sizing. Once we pass final, we do our own 730-Day Done Right Promise walkthrough with you, documenting every detail. Most clients are hosting guests or collecting rent within days.
The Options You’ll Choose Between on a Garage Conversion ADU
Every decision below moves your number and shapes how the unit lives. We lay out the honest trade-offs so you’re not guessing.
- Slab strategy: overlay vs. replace. An insulated floating floor over the existing slab runs $8-$14 per square foot and works if the concrete is structurally sound. Full slab replacement with proper vapor barrier and edge insulation adds $12,000-$25,000 but eliminates moisture issues and gives you a true thermal break. In Whitney’s caliche soil zones, replacement also lets us address any grade or drainage problems while we’re open.
- Kitchen scope: kitchenette vs. full kitchen. A wet bar with mini-fridge, microwave drawer, and single-bowl sink keeps costs down and avoids grease-venting requirements. A full kitchen with range, dishwasher, and vented hood needs a dedicated 240V circuit and either exterior wall penetration or a recirculating system approved by Clark County. The difference is typically $4,000-$9,000.
- Bath configuration: wet bath vs. separate tub/shower. Wet baths (all-in-one waterproof room) suit narrow garages and save $2,000-$4,000 in framing and plumbing. A separate tub or walk-in shower with glass enclosure needs more space and a curb or zero-threshold drain detail - worth it if you’re targeting long-term renters or aging-in-place use.
- HVAC: mini-split vs. ducted extension. A wall-mounted mini-split heat pump is the default for garage conversions - $3,500-$6,500 installed, no ductwork, and efficient in our desert climate. Extending the main house’s central system only works if the existing unit has capacity, which most 1980s-era systems in Whitney do not.
- Exterior finish: match existing stucco or contrast. Matching the home’s original stucco texture and color costs more in material sourcing but satisfies most HOAs and preserves curb appeal. A deliberate contrast - board-and-batten, metal panel, or James Hardie siding - can look sharp on detached garages and sometimes speeds permit approval by clearly distinguishing the ADU’s envelope.
Many homeowners pair their garage conversion with interior finishing work. If you’re thinking about a full kitchen or bath build-out inside the main house too, our Cabinets & Countertops in Whitney crew can coordinate finishes across both spaces. And for flooring that flows from the ADU into a connecting hallway or patio, see our Backsplash, Tile & Flooring in Whitney options.
What Garage Conversion ADU Costs in Whitney, NV
| Project Element | Typical Range |
|---|---|
| Basic garage conversion ADU (existing slab, kitchenette, wet bath) | $45,000 - $75,000 |
| Mid-range conversion (slab overlay, full kitchen, separate bath, mini-split) | $75,000 - $105,000 |
| Full-gut conversion (slab replacement, structural mods, premium finishes) | $105,000 - $130,000 |
Five variables push you up or down this range. First, garage size: a 400-square-foot two-car footprint costs less than a 600-square-foot three-car or an oversized detached workshop, which we see frequently on Whitney’s larger lots. Second, slab condition - replacement adds $12,000-$25,000. Third, plumbing distance - if your main sewer line sits on the opposite side of a post-tension slab, we design around cutting or specify an up-flush system, each with different cost and maintenance profiles. Fourth, electrical service: upgrading from 100 to 200 amps runs $3,500-$7,000. Fifth, finish grade - quartz and KraftMaid cabinets versus laminate and stock boxes can swing kitchen and bath costs by $8,000-$15,000.
Our written estimates include demolition, rough and finish carpentry, MEP rough-in and trim, insulation, drywall, flooring, fixtures, and all County permit and inspection fees. What typically sits outside the base quote: slab replacement (if required), electrical service upgrade (if required), landscaping or hardscaping beyond the garage footprint, and appliance packages. We flag every potential adder during the first site visit - no surprises, no mid-project “discoveries.”
What Whitney Homes Specifically Do to This Job
Whitney sits in unincorporated Clark County, and that jurisdictional fact shapes every garage conversion ADU we build here. The Clark County Building Department handles permits, plan check, and inspections - not the City of Las Vegas - and their ADU review process includes a fire separation analysis for attached garages that some municipal departments skip. Contractors who regularly work Las Vegas proper sometimes miss this, leading to rejected plans and lost weeks.
The housing stock in 89122 is remarkably consistent: single-story wood-frame stucco tract homes built 1975-1995, almost all on post-tension slabs poured over caliche hardpan. Those slabs are structurally sound but unforgiving of uninformed cutting. We’ve seen out-of-market crews jackhammer through garage floors for drain lines without scanning first, severing tensioned cables and triggering a $15,000+ structural repair that Clark County red-tags immediately. We scan every time. It’s non-negotiable.
The age of these homes also means original electrical panels, galvanized plumbing, and low-pitch built-up roofs that may not handle the added load of a mini-split condenser or a raised parapet for fire separation. During summer, we pour any necessary slab patches or stucco base coats before 8 a.m. - the 110°F afternoons common in Whitney from June through September will flash-cure concrete and create stucco cracks before the wall sets properly.
If your project is part of a full Home Additions & ADU in Whitney scope - say, a garage conversion plus a room addition or a new detached unit - we coordinate all County permits under a single master application, avoiding conflicting inspection schedules and keeping your project moving. Our Home Additions & ADU crew handles everything from foundation to finish line, whether you’re in Whitney, The Lakes, or Paradise.
Serving Whitney, NV - Our Local Coverage Area
We’re based in the Whitney area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked - Garage Conversion ADU in Whitney
Most projects run 8-14 weeks from permit approval to final inspection, with 2-5 weeks of that being Clark County plan review and permit issuance. Delays usually come from slab replacement needs or electrical service upgrades we discover during demo. Call (855) 951-4361 and we’ll assess your specific timeline on the first visit - estimates are free.
Yes - all garage conversion ADUs require Clark County building permits, plus separate plumbing and electrical permits. Because Whitney is unincorporated, permits route through the County Building Department on Grand Central Parkway, not City of Las Vegas offices. We handle the full application, plan set, and inspection scheduling as part of our standard project management.
Often yes, depending on your goals. A kitchenette with a macerating toilet and pump-up plumbing system avoids slab cutting entirely, adding roughly $2,500-$4,500 in specialized fixtures. For full kitchens with standard drainage, we typically need at least one slab penetration - but we scan for post-tension cables first and specify the safest route. Not every garage conversion ADU needs extensive plumbing relocation.
Generally yes - you’re starting with walls, roof, and foundation already in place. Our garage conversion ADU range in Whitney is $45,000-$130,000, while new detached ADU construction typically runs $90,000-$220,000. The savings disappear if your garage needs slab replacement, structural reinforcement, or major electrical upgrades, which is why we evaluate existing conditions before quoting.
Every garage conversion ADU is backed by our 730-Day Done Right Promise - if it’s not done right, we make it right. That’s one of the longest workmanship guarantees in residential construction, and it covers all labor and installation. Manufacturer warranties on materials (KraftMaid cabinets, Kohler fixtures, James Hardie siding, etc.) run independently and typically extend 10 years to lifetime. We document every warranty in writing at project closeout.
Get Your Free On-Site Estimate for Garage Conversion ADU in Whitney
We’ll walk your garage, scan the slab if needed, and deliver a written quote with upfront pricing and no surprises. Most estimates take 45 minutes. Call (855) 951-4361 - a live person answers 24/7, and we’ll typically schedule your visit within 48 hours. Ask about 0% financing for 18 months and $1,000 off projects over $10,000 when we meet.
Written by Todd Mervyn, Owner at Groundwork Construction Co., serving Whitney and the Las Vegas Valley since 2014.