Junior ADU & Interior Conversion in Las Vegas, NV

Junior ADU & Interior Conversion in Las Vegas, NV

A junior ADU converts an existing room inside your home – most often a garage, a large bedroom, or an underused bonus space – into a self-contained living unit with its own entrance, kitchenette, and bathroom. In Las Vegas, a properly permitted junior ADU typically costs between $45,000 and $95,000, takes eight to sixteen weeks from permit approval to final walkthrough, and adds measurable rental income or multigenerational housing without touching your property’s footprint. If you’re weighing your options, our full Home Additions & ADU in Las Vegas page lays out every path – from ground-up detached units to the interior conversions we’re covering here.

At Groundwork Construction Co. of Las Vegas, we’ve been building Home Additions & ADU projects and converting interior spaces since 2014, and junior ADUs are one of the most common requests we handle across the valley. The appeal is real: you’re working within walls that already exist, the permitting process is faster than a full detached build, and the return on your investment shows up quickly – either as rental income or as a dedicated space for a parent, an adult child, or a long-term guest. Call us at (855) 951-4361 to talk through your space. A live person picks up around the clock, every day of the week.

Las Vegas has specific municipal code requirements under Clark County and City of Las Vegas Title 19 zoning that govern Junior ADU vs Standard ADU in Las Vegas, NV size limits (generally capped at 500 square feet or 50% of the primary dwelling’s square footage, whichever is less), owner-occupancy requirements, and utility metering. These details change, and getting them wrong costs real money in correction work and delayed inspections. We know the current rules, and we build to them from day one.

When You Need Junior ADU & Interior Conversion

• An aging parent is moving in and needs genuine independence. A shared bathroom and a bedroom at the end of the hall often isn’t enough. A converted garage or a sectioned master suite with its own entrance and kitchenette lets your family member live with you – not on top of you. In neighborhoods like Summerlin West and Henderson’s Green Valley, we see this scenario frequently among homeowners with single-story ranches that have attached two-car garages sitting half-empty.
• You want rental income without a full detached build. Las Vegas short-term rental regulations have tightened in recent years, but long-term interior conversions remain a solid play. A properly permitted junior ADU in the University District or near the Medical District can realistically generate $1,100 to $1,600 per month in rental income, depending on finish level and proximity to UNLV or Sunrise Hospital.
• Your adult child is back home and the current layout doesn’t work for two households. This is one of the most common calls we get in 2025 and 2026. A converted bonus room or a detached-garage interior build gives everyone a front door of their own without the cost of a second property.
• You have an unused garage that’s been functioning as a storage unit. Las Vegas summers are brutal – most garages out here run 120°F or hotter without insulation, which means they’re genuinely unusable for anything but parking. Converting and insulating that space properly (with spray foam rated for desert climates, not fiberglass batts that collapse in the heat) gives you a livable room that holds temperature year-round.
• You’re preparing the home for resale and want to maximize appraised value. A permitted junior ADU adds more appraised square footage and a separate-income designation that many buyers in the Las Vegas market are actively searching for. An unpermitted conversion, by contrast, can kill a sale or trigger costly retroactive compliance work.
• Your HOA rules out a detached structure but allows an interior conversion. Many master-planned communities in Anthem, Inspirada, and Aliante prohibit standalone accessory structures but allow interior space reconfigurations under the existing roofline. We check your CC&Rs before we draw anything.

Our Junior ADU & Interior Conversion Process

1. Free On-Site Assessment and Design Consult. We start by walking the space with you – no charge, no obligation. We’re measuring for code compliance (minimum ceiling height is 7 feet for habitable space under Nevada residential code), checking existing electrical panel capacity, looking at plumbing stub locations, and flagging anything that affects the budget before you’ve committed to a dollar. This is also where we talk about the finish level you’re after and what the space actually needs to become livable.
2. Permitting and Code Research. Las Vegas permitting for junior ADUs runs through the City of Las Vegas Development Services Center or Clark County Building Department depending on your address – and those are two different processes with different timelines. We prepare and submit your permit application, handle plan check corrections, and track the approval. We don’t hand you a packet and tell you to figure it out. Most residential interior conversions in Las Vegas see permit approval in four to eight weeks under current staffing levels, though this can shift seasonally.
3. Structural and Utility Rough-In. Before any drywall goes up, we complete the structural work (framing new walls, adding a separate exterior door opening if needed), rough electrical, rough plumbing for the kitchenette and bathroom, and HVAC ducting or a dedicated mini-split circuit. In a Las Vegas garage conversion, adding a properly sized mini-split is almost always the right call – the existing central system was sized for the home’s conditioned square footage, not an additional unit. We carry all three trades in-house.
4. Insulation and Weatherproofing. This step matters more in Las Vegas than almost anywhere else in the country. A garage slab sits directly on desert soil that radiates heat upward in summer. We install rigid foam board under any floated floor system and closed-cell spray foam on the garage door wall and ceiling before we close up with drywall. The difference in monthly energy cost between a properly insulated conversion and a cheap one is significant and shows up on every power bill from June through September.
5. Interior Finish Work. Flooring, cabinetry for the kitchenette, bathroom tile, fixtures, trim, paint – this is where the space starts looking like a home rather than a construction project. We work with quality material partners so you’re not choosing from whatever the big-box store has in stock. Our kitchenette builds often incorporate KraftMaid cabinetry for durability and finish consistency, and we use Kohler fixtures in the bath for longevity under daily use.
6. Final Inspection and Walkthrough. We schedule the city or county final inspection and walk you through every system in the unit before we hand over the keys. The permit closes, your records are clean, and the 730-Day Done Right Promise kicks in from the day of final sign-off. If anything isn’t right in the first 730 days, we make it right – no runaround, no fine print.

Junior ADU & Interior Conversion Pricing in Las Vegas

Junior ADU and interior conversion pricing in Las Vegas ranges from about $45,000 to $95,000 for most residential projects, with garage conversions at the lower end and full interior builds with premium finishes at the higher end. Upfront pricing, no surprises – the number we give you is the number you pay.

What Moves the Number Up or Down

• Existing plumbing proximity. If a bathroom or laundry room shares a wall with the conversion space, the plumbing rough-in cost drops considerably. Adding a bathroom run across a concrete slab – which is most garage floors in Las Vegas – requires saw-cutting and adds labor and time.
• Panel capacity. Older homes in North Las Vegas and parts of East Las Vegas often have 100-amp panels that are already at or near capacity. Adding a junior ADU with its own HVAC circuit, kitchen appliances, and bathroom typically requires a panel upgrade to 200-amp, which adds $2,500 to $4,500 depending on the utility connection.
• Finish level selections. A standard finish with LVP flooring and stock cabinetry sits at the lower end. If you’re going with KraftMaid cabinetry, Kohler fixtures, and large-format tile, the finish budget is different. We’ll show you both options side by side at the design consult.
• Structural modifications. Cutting a new exterior door opening through a masonry block wall (common in Las Vegas construction from the 1980s and 1990s) adds more labor than framing a door into a wood-stud wall. We identify this in the assessment visit before it shows up as a change order.

Projects over $10,000 qualify for $1,000 off, and we offer 0% financing for 18 months for qualified homeowners – making a $60,000 conversion manageable without draining your savings. Every project starts with a free estimate and design consult. Call (855) 951-4361 to schedule yours.

Why Las Vegas Homeowners Work With Groundwork Construction Co.

We’ve been on job sites in Las Vegas since 2014 as Licensed Home Additions & ADU in Las Vegas, NV contractors, and we’ve built a reputation here the same way anyone does in construction: by doing the work correctly and standing behind it. Every technician who walks through your front door is background-checked and arrives in uniform. You won’t open the door to someone who looks like they came from a different job site with no connection to the company you hired.

The 730-Day Done Right Promise is our clearest differentiator. Two years of workmanship coverage, in writing, on every project we complete. Most contractors in this market offer a one-year warranty if they offer anything at all. We offer 730 days because we build things correctly and we’re willing to put a longer commitment behind that. If something isn’t right, we make it right – not eventually, not after you’ve called three times. That’s what the promise means.

When you call us at any hour, a live person answers. Not a voicemail box, not an after-hours answering service that takes a message and promises a call back Monday. A real person who can start your estimate request, answer questions about your project, or connect you to someone who can help. That’s how we operate, seven days a week.

We also work with material partners whose products hold up in the Las Vegas climate specifically. Desert sun, extreme heat cycles, low humidity, and occasional dust storms are hard on building materials that weren’t selected with this environment in mind. We’ve vetted what works here and what doesn’t, and our material recommendations reflect that field experience – not just whatever we can source quickly.

FAQs – Junior ADU & Interior Conversion in Las Vegas

How much does a junior ADU conversion cost in Las Vegas?

A junior ADU conversion in Las Vegas typically costs between $45,000 and $95,000, depending on the size of the space, the scope of plumbing and electrical work required, and the finish level you choose. A single-car garage conversion with a basic finish usually lands between $45,000 and $60,000. A two-car garage or interior room conversion with upgraded finishes can reach $78,000 to $95,000 once permitting, HVAC, and finish materials are included. Call (855) 951-4361 for an accurate number specific to your home – the estimate is free, and we won’t give you a range that’s too wide to be useful.

Do I need a permit for a junior ADU conversion in Las Vegas?

Yes, a permit is required for any junior ADU or interior conversion in Las Vegas – no exceptions. Converting a garage or interior space into habitable living quarters triggers building, electrical, plumbing, and mechanical permits under both City of Las Vegas and Clark County codes. Unpermitted conversions create serious problems at resale, can void your homeowner’s insurance coverage for that space, and may require full demolition and reconstruction to bring into compliance. We handle the entire permit process for you, from application to final inspection, so your records are clean when the project closes.

How long does an interior ADU conversion take in Las Vegas?

Most junior ADU and interior conversion projects in Las Vegas take between eight and sixteen weeks from permit approval to final walkthrough. The permit process itself – which runs through the City of Las Vegas Development Services Center or Clark County Building Department depending on your address – currently takes four to eight weeks for residential projects. Construction typically runs four to eight additional weeks once the permit is in hand, depending on the complexity of the plumbing rough-in, any structural modifications, and finish selections. We give you a specific schedule at the start of your project and update you when anything changes.

Can a junior ADU be rented out in Las Vegas?

Yes, a properly permitted junior ADU can be rented as a long-term residential rental in Las Vegas. Short-term rental (under 30 days) regulations in Clark County and the City of Las Vegas have become significantly more restrictive in recent years, and junior ADUs within owner-occupied homes may face additional rules depending on the jurisdiction and zoning classification. Long-term rentals are generally straightforward once the unit is permitted and the owner-occupancy requirement is satisfied. We recommend confirming the current rules with the City or County before designing the unit around a specific rental model – and we’re happy to walk through what we know from recent projects when we meet with you.

Start Your Junior ADU Conversion in Las Vegas

If you have a garage, a bonus room, or an underused interior space in your Las Vegas home, a junior ADU conversion or New Detached ADU is one of the most direct ways to add real value – either as rental income, multigenerational housing, or both. Groundwork Construction Co. handles everything from the first permit application to the final inspection, and our 730-Day Done Right Promise covers every bit of work we do. Upfront pricing means the number we quote is the number you pay. No surprises at the end, no change orders built on things we should have caught at the start.

Call (855) 951-4361 to schedule your free estimate and design consult. A live person will pick up and get you started. If you want to see the full range of addition and ADU options available to Las Vegas homeowners, visit our Home Additions & ADU in Las Vegas page – or head to our home page to explore every service we offer across the valley.

Written by the team at Groundwork Construction Co. of Las Vegas, serving Las Vegas.