Casitas & ADUs in Las Vegas

Las Vegas, Nevada · Updated October 2026 · Every figure from published sources — nothing made up

A casita — a small separate living space on your property, also called an ADU or accessory dwelling unit — is how many Las Vegas families keep parents close, help adult children get a start, or earn rental income from space they already own. It's a big project with local rules that shape what's possible, and it starts with a contractor who knows them. Tell us what you're picturing, and we'll match you with a licensed Las Vegas casita builder for a free in-home estimate.

What we can match you for

• Detached backyard casitas with their own kitchen, bathroom, and entrance
• Attached guest suites and in-law quarters
• Garage conversions into living space
• Casitas designed for aging parents — step-free entry, full bathroom, kitchenette
• Rental-ready units with durable finishes
• Detached home offices and studios with a bathroom

What it typically costs

A detached casita in Las Vegas runs $120,000–$350,000 or more, at roughly $200–$350 per square foot, according to Engineer Fix's Las Vegas cost guide. Local builder Newton Construction quotes a narrower $250–$300 per square foot, with typical casitas of 400 to 1,200+ square feet and 3–6 month build timelines.

Using Engineer Fix's per-square-foot range, common sizes come out roughly like this: a 400 sq ft studio, about $80,000–$140,000; a 600 sq ft one-bedroom, about $120,000–$210,000; and a 1,000 sq ft two-bedroom, about $200,000–$350,000. These are planning figures, not quotes — where yours lands depends mostly on distance to the main house's utility connections, how complete the kitchen and bathroom are, and your finishes.

You may also see prefab units advertised at eye-catching prices. A Boxabl casita unit itself runs about $50,000–$60,000 — but that excludes the foundation, site work, delivery and placement, utility hookups, permits, and finishing. The true move-in total is roughly $90,000–$150,000 or more, which is why we always suggest comparing all-in numbers rather than headline prices.

How it works

1. Tell us about your casita. Fill out the short form — detached, attached, or a garage conversion, roughly what size, and who it's for.
2. We call to confirm and book. We'll call to go over your plans, your lot, and your jurisdiction's basic rules, then schedule a free in-home visit.
3. The contractor visits and quotes in writing. Your matched builder looks at your lot and utility layout, talks through what's buildable, and provides a written quote for the full project. You decide — there is no obligation.

Las Vegas specifics

• The 1,000 square foot cap. In unincorporated Clark County, detached ADUs are capped at 1,000 square feet — which is why so many local casitas cluster just under that size. Setback, height, and lot-coverage rules apply too.
• City rules are different. Properties inside Las Vegas city limits follow the city's own ADU rules, which aren't identical to the county's and change from time to time. Large parts of the valley with a Las Vegas mailing address are actually unincorporated county — confirming your jurisdiction comes before any design work.
• Utility runs drive the price. A detached casita needs sewer, water, and electric run from the main house or street. Every extra foot of trenching costs money, and desert soil with caliche and rock digs slowly. A casita close to the house is meaningfully cheaper than one at the back of a deep lot.
• HOA review is common. Many valley communities require architectural approval, with matching exterior materials and roof lines — and some restrict ADUs or ADU rentals. Short-term rentals are heavily restricted in much of the valley, so check your CC&Rs and local rules before counting on rental income.

Frequently asked questions

How much does it cost to build a casita in Las Vegas? Most detached casitas land between $120,000 and $350,000 or more, at roughly $200–$350 per square foot (Engineer Fix). Local builder Newton Construction quotes $250–$300 per square foot for typical builds of 400 to 1,200+ square feet. Size, utility runs, and finishes move your figure within the range.

How big can a casita be? In unincorporated Clark County, detached ADUs are capped at 1,000 square feet. The City of Las Vegas has its own ADU rules, which differ and change over time, so confirm the current limit for your parcel before designing. Attached additions and garage conversions may be treated differently.

How long does a casita take to build? Construction typically takes 3–6 months, per Newton Construction's Las Vegas figures. Design, permitting, and HOA approval happen before construction and add time up front — so if the casita is tied to a parent moving in or a lease ending, starting early matters.

Is a prefab casita cheaper? Less than the headline suggests. A Boxabl unit runs about $50,000–$60,000, but the true move-in total — foundation, site work, utility hookups, permits, and finishing — is roughly $90,000–$150,000 or more. Compare all-in, move-in numbers, whichever route you price.

Do I need permits for a casita? Yes, always. A casita is a dwelling: it needs permits for the structure, electrical, plumbing, and mechanical work, plus inspections. Reputable builders handle permitting as part of the job — confirm yours does. An unpermitted build creates real problems at resale and with your insurer.

Get started

Want the real number for a casita on your lot? Get My Free Estimate — answer a few quick questions and we'll match you with a licensed local builder who can walk your property and quote it properly. We're a free matching service, not a contractor: your project is handled by an independent, licensed Nevada contractor. You choose whether your information goes to one best-matched contractor or up to three for comparing bids — never more than three, ever, and never sold to anyone else, so your phone won't ring for months.