Are ADUs legal on my Las Vegas property?

Clark County, the City of Las Vegas and the City of Henderson each allow accessory dwelling units under specific zoning rules — setbacks, lot coverage, parking and utility separation. We run a zoning check on your parcel before any design work, so you know up front what's permitted on your lot.

What does a casita or ADU cost to build in Las Vegas?

Most detached casitas and ADUs in the Valley land between $175,000 and $450,000 depending on size, kitchen scope, separate utilities and finish level. See our casita & ADU cost guide for tier-by-tier breakdowns.

How long does it take to build an ADU?

Roughly 5–7 months total — 8–12 weeks of design and plan check, then 12–18 weeks of on-site construction from foundation to certificate of occupancy.

Can I rent out my ADU?

In most of the Las Vegas Valley, yes — long-term rentals are generally permitted; short-term rentals depend on the jurisdiction and current ordinance. We'll flag the rules for your specific parcel during the feasibility step.

Do you build the ADU in parallel with a whole-home remodel?

Yes. We routinely run an ADU foundation and shell in parallel with interior work on the main house so the family moves in with both finished. See our whole-home page for combined-scope examples.

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Casita & ADU Construction

Las Vegas ADU Builder

Build4U is a licensed Las Vegas ADU builder designing and constructing detached accessory dwelling units across the Valley — guest houses, in-law suites, pool casitas, rental ADUs and home-office studios. Every Las Vegas ADU project covers zoning checks, architectural plan-sets, City of Las Vegas / Henderson / Clark County permitting, foundation, framing and finish under one contract, so you get one fixed timeline and one accountable team.

See our work

Modern detached casita / ADU built in a Las Vegas backyard by Build4U

What's included

Zoning, setback and lot-coverage analysis up front
Architectural plan set and engineered structural drawings
Permitting with Clark County, City of Las Vegas or City of Henderson
Site prep, foundation, framing and roofing
Full MEP — separate or sub-metered electrical, plumbing and HVAC
Interior finish including kitchenette or full kitchen, bath, flooring and millwork

Typical timeline

Most casitas and ADUs in the Las Vegas Valley take 5–7 months from permit submittal to certificate of occupancy — roughly 8–12 weeks of plan check followed by 12–18 weeks on-site.

Investment

Detached casitas and ADUs in the Las Vegas Valley typically run $175,000 to $450,000 depending on square footage (most are 600–1,200 sq ft), finish level, and whether the unit needs a full kitchen, separate utilities and a separate address.

Materials we specify

We match the casita to the main house — same stucco color and texture, same window line, same roof profile — and finish the interior to the same standard as our remodels: rift-cut oak millwork, honed stone counters, integrated appliances.

Build4U is a licensed Las Vegas ADU and casita builder designing and constructing detached accessory dwelling units across the Valley — guest houses, in-law suites, pool casitas, rental ADUs, and detached home-office studios. Every ADU project starts with a real zoning check on your specific parcel before any design work, runs through full architectural and structural plan sets, handles permitting with Clark County, City of Las Vegas, or City of Henderson, and finishes with the same construction quality as our remodels. One contract, one team, one fixed timeline from feasibility to certificate of occupancy.

Zoning first — what's actually buildable on your parcel

The single biggest variable in any ADU project is what's legally allowed on your specific lot. Clark County, the City of Las Vegas and the City of Henderson each have their own setback rules, lot-coverage maximums, height restrictions, parking requirements and utility-separation standards. Many parcels can support a 600–1,000 sq ft ADU; some can support a 1,200+ sq ft unit with a full kitchen and a separate address; others can't support anything at all. We run the zoning check up front — typically in the first two weeks, before any design fees — so you know exactly what's possible before you spend money on architecture.

Design that matches the main house, not a separate building

A well-designed casita reads as if the main house grew an extra wing — same stucco color and texture, same window line, same roof profile, same trim details. A poorly designed one looks like a portable building parked in the backyard. We model both the casita and the main house together during design, match exterior elevations carefully, and finish the interior to the same standard as our remodels — rift-cut oak millwork, honed stone counters, integrated appliances. The result is a unit that adds value to the property rather than subtracting from it.

Full architectural plans, structural engineering, MEP

Every ADU we build gets a full architectural plan set, structural engineering stamps, and complete MEP routing — not a stock plan. That's the difference between a unit that passes inspection cleanly and one that gets stuck in plan check for months. We coordinate with structural engineers for any unusual conditions (steep lots, retained walls, expansive soil), route MEP for either shared or separate utilities depending on the use case, and detail everything for the specific jurisdiction's review standards.

Permitting we handle — Clark County, City of LV, City of Henderson

Permit submittal, plan-check correspondence, structural review, energy review, and the inevitable revision rounds all run through us. Typical plan-check turnaround is 8–12 weeks; we keep the schedule moving by responding to corrections within the week and tracking each reviewer's outstanding items. By the time you're at the certificate of occupancy stage, every inspection has been signed off cleanly and the unit is fully legal to occupy and (depending on jurisdiction and intent) to rent.

Pricing

What a casita & adu construction typically costs

ADU and casita cost in Las Vegas comes down to square footage, kitchen scope, and whether the unit has separate utilities. 2025 ranges across our valley-wide projects:

Studio / guest casita

$175,000 – $275,000

~400–600 sq ft
Bedroom + bath + kitchenette
Shared utilities with main house
Stucco exterior matched to main
Single permit submittal

1-bedroom ADU

$275,000 – $400,000

~600–900 sq ft
Bedroom + bath + full kitchen + living
Separate or sub-metered utilities
Full architectural plan set
Zoning + HOA coordination

Full ADU with separate address

$400,000 – $550,000+

~900–1,200 sq ft
2 bed + 1.5 bath + full kitchen
Separate utilities + separate address
Engineered structural, separate entry
Long-term rental ready

Process

How a Las Vegas ADU project runs, week by week

01Weeks 1–2

Feasibility & zoning check

We pull your parcel data, run setback and lot-coverage analysis against the jurisdiction (Clark County, City of Las Vegas, or City of Henderson) and confirm what's actually buildable before any design fees.

02Weeks 3–8

Design & engineering

Architectural plan set, structural engineering, MEP routing, exterior elevations matched to the main house. You sign off on a full 3D walkthrough before we submit.

03Weeks 9–14

Permit & plan check

Permit submittal with the right jurisdiction, structural and energy review, plan-check revisions, utility coordination. Typical Clark County / City of Henderson turnaround is 8–12 weeks.

04Weeks 15–17

Site prep & foundation

Site clearing, utility trenching, foundation form-and-pour, underground plumbing rough. Foundation inspection signed off before framing.

05Weeks 18–23

Framing, MEP, roof

Stick framing, roof framing and dry-in, MEP rough (electrical, plumbing, HVAC), insulation. Three inspections in this window — framing, MEP rough, insulation.

06Weeks 24–30

Interior finish & handover

Drywall, paint, flooring, cabinetry, tile, appliances, fixtures, exterior stucco match. Final inspection, certificate of occupancy, full warranty binder.

Exterior match, interior finish, MEP brands

Exterior

Color-matched stucco systems
Matching window line (Andersen, Milgard)
Tile/shingle roof matched to main house

Exterior elevations modeled against the main house — same texture, same window proportions, same roof line.

Interior finish

Rift oak or painted inset cabinetry
Quartz, quartzite or porcelain counters
Engineered hardwood or LVP flooring
Integrated appliances (matched to use case)

Finish level matches the main house remodel standard — not a downgrade just because it's an ADU.

MEP

Carrier / Lennox HVAC mini-splits
Separate or sub-metered electrical
Tankless water heater (Navien / Rinnai)

Mini-split HVAC standard for ADUs — zoned, efficient, no need for ducts. Tankless heaters save space and run forever.

Planning your budget?

Casita & ADU Cost in Las Vegas (2026 Guide)

What a detached casita or ADU actually costs to build in Las Vegas in 2026 — by size, by jurisdiction, and by finish level. Plus zoning rules in Clark County, Henderson, City of Las Vegas and North Las Vegas.

Read the guide

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