Home Additions & ADU in Boulder City - One Fixed Price, Permits Handled

Fast, Reliable Home Additions & ADU Across Boulder City

Adding square footage to a Boulder City home runs $45,000-$130,000 for a traditional room addition and $90,000-$220,000 for a new detached ADU, with garage conversions typically landing between $30,000 and $80,000. Most projects take 4-12 months from design to final inspection, and in Boulder City the Historic Preservation Commission can add 4-8 weeks to that timeline if your property sits in the protected district. We know those streets, those ordinances, and those 1930s foundations better than any outfit driving in from the other side of the valley. Call (877) 610-1318 and we’ll start with a straight conversation, not a sales pitch.

Call (877) 610-1318

Boulder City is one of the only towns in the American West purpose-built by the federal government, constructed in the 1930s to house Hoover Dam workers. That history lives in every block of the original townsite, and it changes how additions get planned, permitted, and priced here. You don’t want a contractor learning Boulder City code on your dime.

Why Barrett & Sons Construction Is Boulder City’s Preferred Home Additions & ADU Company

Tom Barrett started this company in 1998, and he still answers his own phone. When you hire us for a Home Additions & ADU project in Boulder City, the person who walks your roofline and measures your rear setback is the same person whose name is on the contract. Not a rotating cast of subcontractors, not a call center in another state.

Boulder City homeowners tell us the same thing again and again: they got burned by a national outfit that quoted one number over the phone and delivered a different bill at the door. That’s why every change order we issue is written, signed, and priced before a single nail moves. That’s why we pull permits and stand beside the inspector, not hide from him. And that’s why every job carries the 90-Day Done Right Promise in plain writing: if it’s not done right, Tom comes back and makes it right. One call.

We’ve worked on Bureau of Reclamation bungalows near Avenue B, mid-century ranch homes off Adams Boulevard, and newer builds out near the Boulder Creek golf area. We know what the HPC wants to see in a window spec. We know which streets have clay soil that shifts slabs. We know the difference between a 1930s lath-and-plaster wall and a 1980s gypsum one. That’s the stuff you only learn by doing the work here, not by reading a market research deck.

Ask anyone on your street, or look up the license number yourself. Boulder City is small enough that reputation travels fast, and we’ve spent 29 years building one we’re proud to stand behind.

Our Home Additions & ADU Services in Boulder City

ADU Design & Permitting

An accessory dwelling unit in Boulder City is a different animal than one in Henderson. If your lot sits within the Historic District, the HPC must review exterior elevations, rooflines, and window placement before the building department will even look at your structural drawings. We handle that process start to finish, including Historic Preservation Commission submittals, period-compatible material sourcing, and the back-and-forth that typically adds a month or two to the schedule. Most ADU design and permitting packages in Boulder City run $8,000-$20,000 depending on the level of HPC review required.

Garage Conversion ADU

Converting an attached or detached garage is often the fastest path to rental income or an in-law suite in Boulder City, and it usually costs $30,000-$80,000. The mid-century ranch homes that dominate the neighborhoods south of Nevada Way often have oversized two-car garages that convert cleanly. The catch: many of those garages have slab floors poured in the 1960s with no vapor barrier, so we plan for moisture mitigation and insulation upgrades from day one rather than discovering them mid-project.

New Detached ADU

A new detached ADU in Boulder City typically runs $90,000-$220,000, with the spread driven by foundation work, utility trenching, and whether the structure falls under HPC jurisdiction. At 2,500 feet of elevation in the Mojave, our concrete specs account for serious thermal cycling: slab edges get reinforced differently than they would at lower elevation, and we spec sealants rated for intense UV. You want an ADU that survives forty Boulder City summers, not one that starts showing stucco cracks in year three.

Junior ADU & Interior Conversion

A junior ADU, which converts existing interior space like a den or oversized laundry room into a separate living unit, is the most budget-conscious ADU path in Boulder City. These projects typically land between $40,000 and $75,000. The historic bungalows near the downtown corridor often have a rear service porch or utility room that works surprisingly well for this, but the original 1930s framing needs careful evaluation before we commit to a scope. We do that evaluation honestly, even when the honest answer is “this won’t work because the foundation says so.”

Trusted Brands We Service in Boulder City

We don’t install materials off the back of a van. On Boulder City additions and ADUs, we regularly spec Schluter systems for wet-area waterproofing in secondary Bathroom Remodeling - Boulder City projects, Sterling fixtures where durability matters more than luxury, and GAF roofing membranes that hold up under Boulder City’s relentless UV exposure. These are materials you can look up, compare, and verify, and we keep local stock relationships that keep turnaround tight when a change order requires an additional run of a specific profile or trim. If you’re comparing bids, ask what brands are being quoted. Then ask us.

Common Home Additions & ADU Problems We See in Boulder City Homes

• UV-blasted stucco and roofing on 1990s ranchers. At 2,500 feet in the Mojave, Boulder City gets more intense sun than Las Vegas proper. Exterior sealants and roofing underlayment degrade faster than manufacturers’ baseline warranties assume, which means an addition tied into an old stucco envelope needs careful compatibility work at the seam.
• 1930s framing that doesn’t match modern load tables. The historic core is full of Bureau of Reclamation bungalows with original wood framing, period masonry, and aging utility runs. Tying a new addition into that structure requires a structural engineer who has actually worked on these houses, not someone applying generic assumptions.
• HPC review surprises. Exterior window replacements, roof materials, and any addition visible from Avenue B or Nevada Way may require a Historic Preservation Commission hearing. Homeowners who don’t know this get timelines that slip by months. We build that review into the schedule from the first week.
• Clay soil and slab movement. Certain pockets of Boulder City have expansive clay soils that shift slabs over decades. A new ADU foundation needs a geotech report and possibly deeper footings, and that $4,000-$8,000 line item catches people off guard if it wasn’t in the original scope.

Pricing for Home Additions & ADU in Boulder City, NV

We Also Serve Cities Near Boulder City

We work regularly in Home Additions & ADU in Boulder City and surrounding Clark County communities. From Henderson to Whitney, Paradise to Enterprise, we bring the same written-scope approach and the same crew members to every job. Most of our Boulder City estimates come from referrals in those neighboring towns, which says something worth hearing.

FAQs - Home Additions & ADU in Boulder City