Garage Conversion ADU in Summerlin South: Scope, Timeline, and Cost
A garage conversion ADU in Summerlin South transforms your existing attached or detached garage into a permitted, habitable dwelling unit with its own kitchen, bathroom, sleeping area, and separate entrance. Most projects we complete in 89135 run 10 to 16 weeks from permit approval to final inspection, with costs typically landing between $30,000 and $80,000 depending on whether we’re working with a finished two-car structure or a bare shell. Call (855) 951-4361 to schedule a free on-site assessment - we’ll walk the space, flag the structural and utility constraints, and give you a written estimate with upfront pricing, no surprises.
How we turn a garage into a legal ADU
We’ve refined this into five clear stages after completing garage conversions across Summerlin South and the broader Las Vegas valley. Each stage has a decision point where your choices directly affect timeline and budget.
Stage 1: Feasibility and pre-construction survey (1-2 weeks)
We measure the existing slab, roof structure, and wall framing to confirm what can stay and what must change. In Summerlin South, this stage always includes a preliminary HOA review - the Summerlin Community Association’s Architectural Review Committee requires pre-approval for exterior modifications, and we submit on your behalf to avoid delays later. You’ll decide at this point whether you’re keeping the existing footprint or bumping out for additional square footage, which triggers a different permit path.
Stage 2: Design, engineering, and permit submission (3-6 weeks)
Our draftsman produces plans showing the new layout, structural modifications, and utility routing. Clark County requires engineered drawings for any ADU with altered load paths or new electrical service. We handle the permit submission and field any corrections from the building department. Your decisions here: ceiling height (converting a standard 8-foot garage to 9-foot living height often means reframing the roof), window placement for natural light requirements, and whether you’re adding a separate meter or sub-paneling from the main house.
Stage 3: Demolition, structural modification, and rough utilities (2-3 weeks)
The garage door comes out, the opening gets framed and sheathed to match existing stucco, and we cut the slab for plumbing drains if you’re adding a bathroom or kitchen. This is where Summerlin South’s caliche hardpan often surprises contractors who haven’t worked 89135 before - if your drains need to drop below grade, we’re frequently breaking rock with pneumatic tools. We also run new electrical, HVAC ducting or mini-split lines, and rough plumbing. You’ll sign off on layout markings before we close walls.
Stage 4: Insulation, drywall, finishes, and fixture installation (3-5 weeks)
We insulate to current energy code (R-19 walls, R-30 ceiling in this climate zone), hang drywall, and install flooring, cabinets, countertops, and fixtures. Many homeowners pair this stage with Cabinets & Countertops in Summerlin South or Backsplash, Tile & Flooring in Summerlin South selections from our curated brand partners. Your material choices here - luxury vinyl plank versus tile, quartz versus laminate counters, standard versus soft-close cabinetry - drive the final look and the final third of your budget.
Stage 5: Final inspection and certificate of occupancy (1-2 weeks)
Clark County inspects structural, electrical, plumbing, and HVAC work before issuing the certificate of occupancy. We address any punch-list items immediately. The 730-Day Done Right Promise begins at final walkthrough - if anything isn’t right, we make it right.
The options you’ll choose between for your garage conversion ADU
Every decision below affects how the space lives, how it holds value, and what you’ll spend:
- Slab strategy: Keep the existing concrete slab with moisture barrier and flooring over it, or cut and repour with in-floor insulation and radiant heating tubes. The existing slab is faster and cheaper ($3,000-$5,000 less), but uninsulated concrete pulls heat in Summerlin South’s summer and cold in winter. Radiant-ready repour adds comfort and resale appeal but pushes budget toward the upper range.
- Roof and ceiling: Maintain the existing pitched or flat roof with interior drywall, or raise the ceiling height by reframing the roof structure. Standard height conversion runs $8,000-$15,000 less than a raised ceiling, but the volume difference is dramatic - we see most custom-home clients in Summerlin South opt for the raise.
- Kitchenette versus full kitchen: A wet bar with mini-fridge and microwave drawer fits tight spaces and keeps costs down; a full kitchen with range, vent hood, dishwasher, and full-size refrigerator requires more square footage, more plumbing, and more electrical but rents or houses family far more effectively. The gap is typically $4,000-$9,000.
- Bathroom configuration: Three-quarter bath (shower, toilet, vanity) versus full bath (tub or walk-in shower). For ADUs intended as rental income, the three-quarter is standard. For aging-parent occupancy, the full bath with accessibility features is worth the extra $2,500-$5,000.
- HVAC approach: Extend the main house system (cheaper upfront, but can overload existing equipment and complicates separate metering), or install a dedicated mini-split with its own condenser (higher initial cost, better zone control, cleaner for rental or resale). In 89135’s hard-freeze zone, we size mini-splits with low-ambient heating capability.
- Exterior integration: Match existing stucco texture and paint exactly, or intentionally differentiate the ADU entrance with a contrasting finish. The Summerlin Community Association prefers seamless integration for street-facing garages; courtyard or alley-access garages have more flexibility.
What Garage Conversion ADU costs in Summerlin South, NV
Garage conversion ADU projects in Summerlin South typically range from $30,000 to $80,000. Here’s what moves you within that band:
| Cost driver | Low-end scenario | High-end scenario |
|---|---|---|
| Existing structure condition | Drywall-finished garage, good roof, level slab | Unfinished shell, sagging roof, cracked slab |
| Square footage | 400 sq ft (single-car) | 700+ sq ft (oversized two-car or bump-out) |
| Utility complexity | Kitchenette, three-quarter bath, sub-panel | Full kitchen, full bath, separate meter, gas line |
| Material grade | LVP flooring, laminate counters, stock cabinets | Tile or engineered hardwood, quartz, semi-custom cabinetry |
| Structural modifications | Door infill only, standard ceiling | Roof raise, wall relocation, foundation reinforcement |
What’s included in our written estimate: all demolition, framing, insulation, drywall, flooring, cabinetry, countertops, fixtures, electrical and plumbing rough and finish, HVAC, exterior stucco matching, permit fees, and final cleanup. What’s typically not included: separate utility service connections (gas, water, electric meter), landscape repair, and furniture or window coverings. We flag these exclusions before you sign - upfront pricing, no surprises.
Financing is available through our 0% for 18 months program, and projects over $10,000 qualify for $1,000 off.
What Summerlin South homes specifically do to this job
The 89135 ZIP changes garage conversion ADU work in ways that matter to your timeline and budget. Summerlin South sits within the Summerlin master-planned community governed by the Summerlin Community Association’s Architectural Review Committee, which requires pre-approval for virtually all exterior construction, additions, and visible modifications. We submit ARC applications as a standard part of our pre-construction phase - skip this step and you risk a stop-work order mid-project. The committee typically responds in 10-14 business days, and we’ve learned which plan details they flag for revision.
The housing stock here also shapes our approach. The 89135 ZIP is dominated by upscale stucco-over-wood-frame homes built from the mid-1990s through the 2010s under Howard Hughes Corporation’s master plan, with a high concentration of semi-custom and custom luxury homes in the $700K-$2M+ tier. These aren’t utilitarian garages - they’re often oversized, sometimes with finished interiors, custom carriage doors, or integrated smart-home systems that require careful decommissioning rather than demolition. We preserve and relocate automation hardware when possible.
Then there’s the ground itself. The caliche hardpan lying just inches below grade throughout the western Las Vegas Valley turns routine excavation for plumbing trenches into jackhammer work. Experienced contractors in 89135 always build caliche uplifts into their bids - the calcium carbonate hardpan can start as shallow as 6 inches below grade, routinely requiring pneumatic breaking or even a mini-excavator with a hydraulic hammer just to set a standard footer. Newcomers who price the job to Las Vegas flat-desert norms get burned badly on time and equipment costs. We’ve been working this soil long enough to know what we’re hitting before we break ground.
Finally, the elevation matters. At roughly 2,500-2,800 feet at the base of the Spring Mountains, Summerlin South sees stronger downslope winds and occasional hard freezes that central Las Vegas doesn’t. Exterior stucco patches must cure properly in wind, and any exposed plumbing or exterior hose bibs need freeze-thaw protection we wouldn’t bother with in the lower valley.
Serving Summerlin South, NV - Our Local Coverage Area
We’re based in the Summerlin South 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 Summerlin South
Most garage conversion ADU projects in Summerlin South take 10 to 16 weeks from permit approval to certificate of occupancy, with permit submission and HOA review adding 3 to 6 weeks before construction starts. ARC pre-approval through the Summerlin Community Association is mandatory and not optional. Call (855) 951-4361 and we’ll outline a realistic timeline for your specific property.
Yes - Clark County requires building, electrical, plumbing, and mechanical permits for any garage conversion ADU, and the Summerlin Community Association requires separate ARC approval before exterior work begins. We handle both submission tracks as part of our standard process. The permit package includes engineered drawings for structural and utility modifications.
You can minimize utility relocation if your garage already has adequate electrical service and you’re willing to place the bathroom and kitchen near existing drain lines, but some modification is almost always required to meet current code. ADUs need a separate kitchen, bathroom, and sleeping area with egress windows - these functions demand plumbing and electrical infrastructure that garages simply aren’t built with. During our free assessment, we’ll map the most efficient routing to limit slab cutting and wall demolition.
A garage conversion ADU is typically 40% to 60% less expensive than a new detached ADU because you’re using existing foundation, walls, and roof structure. New detached ADU construction in the Las Vegas market runs $90,000 to $220,000, while garage conversions start around $30,000. The trade-off is square footage and layout flexibility - you’re working within an existing box. For many Home Additions & ADU in Summerlin South clients, the garage conversion is the right first step.
Every garage conversion ADU we build is backed by our 730-Day Done Right Promise - if it’s not done right, we make it right, one of the longest workmanship guarantees in residential construction. Manufacturer warranties on materials (cabinets, fixtures, flooring, windows) run separately and typically extend 10 years to lifetime. We document all warranty information in your project closeout packet. Questions after move-in? A live person answers our phones 24/7.
Ready to convert your garage into legal living space?
Call (855) 951-4361 to schedule your free on-site estimate for a garage conversion ADU in Summerlin South. We’ll assess your existing structure, flag the HOA and utility considerations specific to your property, and deliver a written quote with upfront pricing. Our Home Additions & ADU crew is standing by - live person, 24/7, no voicemail.
Written by Todd Mervyn, Owner at Groundwork Construction Co., serving Summerlin South since 2014.