Trusted Home Additions & ADU for Las Vegas Homeowners
Home additions and ADU construction in Las Vegas typically run $45,000-$130,000 for room additions and $90,000-$220,000 for detached ADUs, with most projects permitted and underway within 6-10 weeks. Groundwork Construction Co. has been building in Las Vegas since 2014, and our live person answers calls 24/7 at (855) 951-4361. We’ve completed additions across Summerlin South, Paradise, and Henderson, from garage conversions in Spring Valley to full second-story builds in Enterprise.
Las Vegas homeowners call us when they’ve outgrown their square footage but don’t want to leave their neighborhood, their school district, or the equity they’ve built. The desert climate here creates specific challenges: expansive clay soils in the northeast valley, strict water-use calculations for any new dwelling unit, and energy code requirements that differ from what out-of-state contractors expect. We’ve navigated Clark County permitting through multiple code cycles. Our 730-Day Done Right Promise means if it’s not done right, we make it right - one of the longest workmanship guarantees you’ll find on a residential addition in southern Nevada.
What Our Home Additions & ADU Service Includes
ADU Design & Permitting
An ADU - accessory dwelling unit - is a secondary residential space on your existing lot, and in Las Vegas, it requires navigating Clark County’s specific zoning overlays, utility connection rules, and fire separation requirements. You need this service when you want rental income, multigenerational housing, or future flexibility without buying new land. At Groundwork Construction Co., we handle the full ADU Design & Permitting and build sequence in-house: our team produces construction drawings that satisfy the Las Vegas Planning Department the first time, not after three revision cycles. We’ve permitted ADUs in Winchester, Whitney, and throughout unincorporated Clark County where the rules differ block by block.
Garage Conversion ADU
A Garage Conversion ADU transforms existing enclosed space into a legal dwelling unit, typically the fastest and most cost-effective ADU path in Las Vegas. You need this when you have an underused garage, especially common in older Paradise and Sunrise Manor neighborhoods built with oversized two-car structures. We assess your garage’s foundation capacity, ceiling height, and proximity to property lines against current code. Our conversions include full electrical service upgrades, mini-split HVAC sized for 110-degree July afternoons, and kitchenettes that meet health department requirements.
New Detached ADU
A new detached ADU is a standalone structure, from a backyard cottage to a two-bedroom rental unit, built from foundation to finish line on your property. You need this when privacy matters - tenant and homeowner separation, or a dedicated space for aging parents. Las Vegas heat demands specific material choices: we specify James Hardie siding and GAF cool-roof shingles on our detached units, paired with proper insulation values that keep utility bills manageable through August. Our site prep includes soil testing in areas like Boulder City where caliche layers affect foundation depth.
Junior ADU & Interior Conversion
A Junior ADU & Interior Conversion is created within your existing home’s footprint, typically 500 square feet or less, with a separate entrance and efficiency kitchen. You need this when your lot size won’t accommodate a detached unit, common in older Spring Valley and Winchester subdivisions. We identify the optimal interior partition points, run independent electrical meters where required, and ensure egress windows meet current fire code. Our team has converted formal living rooms, oversized master suites, and walk-out basement areas into legal Junior ADUs that appraise as separate rental income.
ADU Site Prep & Utilities
ADU Site Prep & Utilities are the invisible foundation of every successful ADU - grading, trenching, sewer lateral extensions, and electrical service upgrades. You need this when your existing utilities can’t handle the additional load, which we find in about 60% of Las Vegas properties over 25 years old. We coordinate with NV Energy for service upgrades and the Las Vegas Valley Water District for meter splits, handling the applications so you don’t wait in municipal queues. Our excavation crews know where the caliche sits in Enterprise versus the sandy soils near Pahrump, and we price that geological reality into your upfront estimate.
Room Additions
A room addition expands your home’s conditioned footprint - master suites, home offices, expanded kitchens, or family rooms tied directly to your existing structure. You need this when you love your location but need one more bedroom, a dedicated workspace, or open-concept living. In Las Vegas, we match your existing roofline and stucco texture so the addition reads as original construction, not an afterthought. Our framers use engineered lumber where spans exceed 16 feet, and we always verify that your HVAC system can handle the additional load or specify a dedicated zone.
Second Story Additions
A second story addition doubles your square footage without sacrificing yard space, the only option for many zero-lot-line homes in Summerlin South and Henderson. You need this when your foundation and framing can support vertical expansion, which we determine through structural assessment before design begins. We engineer stair placements that minimize first-floor disruption, and we specify sound-dampening floor assemblies so foot traffic above doesn’t echo below. Every second story we build includes upgraded electrical panels and often a second HVAC zone to handle the thermal stratification common in desert climates.
Sunrooms & Enclosed Patios
Sunrooms and enclosed patios convert outdoor living space into year-round usable square footage, with full glass walls that capture Las Vegas’s mountain views. You need this when you want protected outdoor space without the full cost of conventional framing and insulation. We use Andersen and Pella window systems rated for our solar heat gain coefficients, with low-E glass that keeps interiors comfortable in July. Our enclosures include proper slab insulation and drainage to prevent the condensation issues we see in DIY conversions around Sunrise Manor.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service for Home Additions & ADU
We’ve partnered with Abodu on multiple prefabricated ADU installations in the Las Vegas market, delivering their precision-built units from factory to foundation in as little as 30 days. Their steel-frame construction handles our seismic requirements without the thermal bridging issues of conventional steel, and we’ve completed their electrical and utility tie-ins across four Clark County jurisdictions. Abodu’s units arrive 90% complete, which means less weather exposure during construction and faster certificate-of-occupancy timelines.
We’ve also worked with Dvele’s smart-home-integrated ADU platform for homeowners who want rental units with app-controlled HVAC, leak detection, and automated tenant onboarding. Their panelized construction system requires exact foundation tolerances, and our crews have the laser-leveling equipment and experience to meet their specifications. Whether you have an Abodu, Dvele, or any other make - or you’re starting from scratch with stick-built construction - we can design, permit, and build to your specifications. Our curated brand partnerships across every trade mean you choose quality, not just availability.
Signs You Need Home Additions & ADU Right Now
- Your family has outgrown your bedrooms but you don’t want to relocate. In Las Vegas’s current market, moving from a 3-bedroom to a 4-bedroom in Summerlin South or Henderson can cost $150,000+ in equity differential alone, before closing costs and interest rate changes. A room addition or garage conversion ADU keeps you in your school district and neighborhood while solving the space problem permanently.
- You’re paying $2,000+ monthly for senior care when your parents could live on your property. Assisted living in Clark County averages higher than a financed ADU payment, and multigenerational housing keeps family connections intact. We’ve built accessibility-focused ADUs with zero-step entries, grab-bar blocking, and wider doorways that accommodate aging-in-place needs without institutional aesthetics.
- Your garage sits empty while you lack a home office or rental income. Post-pandemic remote work has made dedicated office space non-negotiable for many Las Vegas professionals, and garage conversions deliver 400-600 square feet of legal living space for $30,000-$80,000. That’s often recoverable in rental income within 24-36 months, or immediately in home office tax deductions.
- Your utility bills spike because your HVAC struggles to cool an inefficient layout. Older Las Vegas homes with closed floor plans and inadequate insulation waste enormous cooling energy. A well-designed addition with modern envelope standards, properly zoned HVAC, and cool-roof materials can actually reduce your total utility spend even while adding square footage.
- You’re sitting on approved ADU plans that expired because no contractor could start. Clark County permits expire after 180 days of inactivity, and we’ve seen homeowners lose $8,000+ in architectural and engineering fees when timelines slip. If your plans are aging, call us - we can reactivate permits quickly and often salvage most of the prior approval work.
Our Home Additions & ADU Process - Step by Step
- 1
On-site consultation and feasibility assessment. We visit your property, measure existing structures, photograph utility locations, and identify zoning constraints specific to your parcel. For Las Vegas ADU projects, we verify your lot coverage, setback, and parking requirements against current Clark County code within 48 hours of our visit.
- 2
Design development and preliminary pricing. Our team produces scaled drawings and a line-item estimate with no hidden allowances. You’ll see exactly what Sakrete concrete costs versus competitive mixes, what Andersen window packages run versus Pella alternatives, and where you can adjust scope without compromising structure. Upfront pricing, no surprises.
- 3
Permit submission and plan check navigation. We submit complete drawing packages to the Las Vegas Planning Department or appropriate jurisdiction, attend plan check meetings, and resolve corrections without passing delay costs to you. Our permit expeditor knows the reviewers by name in Henderson, North Las Vegas, and unincorporated Clark County.
- 4
Construction with weekly progress updates. Background-checked, uniformed technicians arrive on schedule, not in unmarked vans. We protect your existing landscaping, maintain dust barriers, and provide photo updates via text or email. Todd Mervyn reviews every project weekly, and our live person is available 24/7 if questions arise.
- 5
Final inspection, walkthrough, and warranty registration. We accompany the inspector, address any punch items immediately, and deliver your 730-Day Done Right Promise documentation in writing. Built to last, backed in writing - that’s how we close every addition and ADU in Las Vegas.
How Much Does Home Additions & ADU Cost in Las Vegas?
A typical room addition in Las Vegas runs $45,000-$130,000 depending on square footage, foundation type, and finish level. Garage conversion ADUs generally fall in the $30,000-$80,000 range, while new detached ADUs run $90,000-$220,000 based on size, utility complexity, and whether you choose prefabricated or stick-built construction. Second-story additions typically start at the higher end of the room-addition range due to structural reinforcement requirements.
Several factors move these numbers. Soil conditions matter: caliche excavation in Boulder City or Enterprise adds foundation costs versus the sandy loam near Pahrump. Utility distance from your main structure affects sewer and electrical trenching. Finish selections multiply fast - a basic kitchenette runs $8,000-$15,000, while full appliance packages with Cambria counters and KraftMaid cabinets can double that. We specify exactly what you’re getting in our estimates, with model numbers where applicable, so you can compare apples-to-apples against other bids.
To avoid overpaying, get at least three estimates with equivalent scope documents, and watch for allowance-based pricing that hides true costs until construction starts. Our estimates are fixed-price with defined alternates - the number you see is the number you pay. Every free estimate includes a full design consultation, preliminary floor plans, and a permit timeline. Call (855) 951-4361 to schedule yours.
Home Additions & ADU Near Las Vegas - Our Service Area
We build additions and ADUs across the full Las Vegas Valley and beyond: Home Additions & ADU in Henderson, Home Additions & ADU in North Las Vegas, and throughout Paradise, Sunrise Manor, Spring Valley, Enterprise, Whitney, Winchester, Summerlin South, and Boulder City. Typical response time for initial consultation is 24-48 hours in the urban core, 48-72 hours for Pahrump and outlying areas. We maintain active contractor licenses in Clark County and all incorporated municipalities, so your project never stalls for jurisdictional paperwork.
Serving Las Vegas, NV - Our Local Coverage Area
We’re based in the Las Vegas 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 Questions - Home Additions & ADU in Las Vegas
A home addition expands your primary residence’s conditioned square footage, while an ADU (accessory dwelling unit) is a separate, independent living space with its own kitchen, bathroom, and entrance. In Las Vegas, ADUs can be attached to your home, converted from existing space like a garage, or built as detached structures, but all must meet Clark County’s specific zoning and utility requirements for legal rental. Groundwork Construction Co. handles both types, from foundation to finish line, with the same 730-Day Done Right Promise.
Most room additions take 3-5 months from permit to final inspection, while ADUs range from 4-8 months depending on complexity and jurisdiction. Prefabricated ADU units like Abodu can compress construction to 6-10 weeks after foundation completion, but Clark County’s permit timeline adds 6-12 weeks regardless of construction method. We provide a detailed schedule with your estimate and update it weekly during construction.
An ADU in Las Vegas costs $90,000-$220,000 to build versus $350,000+ for a comparable standalone rental in today’s market, and you retain your existing property’s appreciation. Financing through our 0% for 18 months program or traditional construction loans keeps monthly payments below typical rental income from a one-bedroom unit in Paradise or Henderson. Call (855) 951-4361 for a free estimate and rental income projection specific to your neighborhood.
Yes, we’ve installed Abodu and Dvele units across the Las Vegas Valley and can manage site prep, foundation, utility connections, and final finish work for any factory-built system. We also design and build custom stick-framed ADUs when prefab dimensions don’t fit your lot or aesthetic preferences. Whether you have a specific brand in mind or want us to recommend the best approach for your property, we’ll give you straight guidance without brand bias.
We answer calls with a live person 24/7, and we can typically schedule consultations within 24-48 hours for urgent situations like permit expirations or family health changes requiring immediate housing solutions. Actual construction start depends on permit status and our current backlog, which we disclose transparently. For true emergencies - structural failures, safety issues - we can deploy temporary stabilization while permits process.
Every project is covered by our 730-Day Done Right Promise - if it’s not done right, we make it right, with no deductibles, no prorating, and no fine print exclusions. This covers workmanship, installation quality, and material defects we installed. Manufacturer warranties on products like Andersen windows or GAF roofing run independently and often extend 20 years or more. We register all warranties and provide you complete documentation at project closeout.
Gather your property survey, any existing architectural plans, and a rough idea of your budget range and timeline goals. We’ll measure your lot, photograph existing conditions, and check preliminary zoning constraints during our visit. There’s no obligation - estimates and design consultations are free, and we won’t pressure you to commit before you’re ready. Call (855) 951-4361 to schedule, or fill out our form for a callback from our live team.
Schedule Your Home Additions & ADU Service in Las Vegas Today
Call (855) 951-4361 now and speak with a live person, 24/7. We’ll schedule your free estimate and design consultation, review your property’s specific potential, and deliver upfront pricing with no surprises. Ask about our current promotion - $1,000 off projects over $10,000 - and 0% financing for 18 months. From foundation to finish line, Groundwork Construction Co. builds additions and ADUs in Las Vegas that last, backed in writing.
Written by Todd Mervyn, Owner at Groundwork Construction Co., serving Las Vegas since 2014.