Room Addition Cost by Type (Las Vegas)
A room addition in Las Vegas runs from about $20,300 for a small bedroom at standard finishes to $163,400 for a large high-end family room. Each range below runs from the small end at standard finish to the large end at high-end finish; the estimate narrows it to your size and finish. Contractors bid from published construction cost guides adjusted for Las Vegas labor, and GetProEstimate hands you that number first.
Bedroom or Home Office (150–250 sq ft)
$20,300–$83,100
At 200 sq ft: Standard $26,700–$39,600 · Mid-range $33,800–$50,500 · High-end $43,200–$66,900
Bedroom + Bathroom Suite (300–450 sq ft)
$45,900–$156,800
At 375 sq ft: Standard $55,500–$82,000 · Mid-range $70,600–$105,100 · High-end $90,700–$140,100
Family Room / Great Room (400–600 sq ft)
$52,200–$163,400
At 500 sq ft: Standard $58,400–$86,300 · Mid-range $74,400–$110,600 · High-end $95,500–$147,500
Enclosed Patio / Arizona Room (200–400 sq ft)
$18,600–$135,300
At 300 sq ft: Standard $27,400–$60,000 · Mid-range $34,700–$76,700 · High-end $44,400–$102,000
Source: the construction cost guides contractors bid from, adjusted for Las Vegas labor. Small end at standard finish to large end at high-end finish.
What Drives the Price in Las Vegas
Size and finish level, the two biggest levers.
A bathroom in the addition means cutting the slab for drains.
New footings in caliche, the hard desert layer that raises excavation cost.
Cooling: the new room needs AC capacity the existing system may not have, often handled with a ductless mini-split.
Roof tie-in, usually matching concrete tile on valley homes.
HOA architectural review in master-planned communities.
Permit and plan review in the jurisdiction that covers your address.
About 3,800 additions, remodels, casitas and baths are permitted across the valley each year. In the City of Las Vegas, the 882 addition and remodel permits that carry a real value ran $15,000 to $70,000 for the middle half (median $34,500), a mix of baths, remodels and additions rather than a clean addition price. Want a separate unit with its own kitchen instead? Since July 1, 2026, Nevada’s casita law (AB 396) allows one on most residential lots: see
casita costs.
Before You Sign
Four permit offices cover the valley: Clark County, the City of Las Vegas, Henderson and North Las Vegas. Your contractor pulls the permit; HVAC change-outs, water heaters, repipes, panel changes, solar, pools and patio covers all need one. Like-for-like shingle re-roofs and window replacements generally do not.
Nevada gives you three business days to cancel a door-to-door sale (NRS 598.230).
Frequently Asked Questions
How much does a room addition cost in Las Vegas?
About $20,300 to $83,100 for a bedroom or home office of 150 to 250 square feet, $45,900 to $156,800 for a bedroom and bathroom suite, and $52,200 to $163,400 for a 400 to 600 square foot family room. Size and finish level move it most.
What is the cost per square foot for a room addition in Las Vegas?
Roughly $130 to $200 per square foot for a bedroom at standard finishes and $215 to $335 at high-end, before a bathroom. Small rooms cost more per foot because the foundation, roof tie-in and permit cost about the same whatever the size.
How much does it cost to add a bedroom and bathroom in Las Vegas?
$55,500 to $82,000 at standard finish for about 375 square feet, $70,600 to $105,100 mid-range and $90,700 to $140,100 high-end. The bathroom adds plumbing through the slab, the main reason a suite costs far more per foot than a bedroom.
Do I need a permit for a room addition in Las Vegas?
Yes, a building permit with plan review in all four valley jurisdictions (Clark County, Las Vegas, Henderson and North Las Vegas); your contractor pulls it. Master-planned HOAs also review additions, so get their approval before you apply.
Is a room addition or a casita better in Las Vegas?
An addition adds space to the house you live in; a casita is a separate unit with its own entrance and kitchen, which Nevada’s AB 396 now allows on most residential lots. A casita usually costs more but can house family or a long-term tenant.
Should I enclose my patio instead of building an addition?
An enclosed patio, the Arizona room, is often the least expensive way to add a room, about $27,400 to $60,000 at standard finish for 300 square feet. Whether the existing slab and cover can be reused decides most of the price.
Why does the estimate differ from a contractor’s quote?
The range is the published cost-guide price adjusted for Las Vegas labor; a quote is one contractor’s price for one scope. The contractor you work with through GetProEstimate quotes to the same scope you saw.