An ADU builder in Las Vegas is a licensed contractor who designs and constructs accessory dwelling units — detached backyard units, garage conversions, attached additions, and junior ADUs (JADUs). Because an ADU is a complete second dwelling, the builder coordinates foundation, framing, plumbing, electrical, and HVAC work and pulls it through Las Vegas's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in Nevada.
What ADU Builders Cost in Las Vegas [12][13][14][15]
Based on our Las Vegas cost data, expect the following ranges from local ADU builders. Quotes for the same scope typically vary 20-40% between contractors, so getting at least three bids is the single best way to control cost.
| New Detached ADU (all-in) | $110,000-$230,000 |
| Cost per Sq Ft | $180-$330 |
| Garage Conversion | $50,000-$120,000 |
| Prefab / Modular ADU (installed) | $80,000-$180,000 |
| City Permit & Plan Review | Square-footage based (Building & Safety 2020 Building User Fees, Table 3-A, effective July 1, 2021 and still in force). The city's Permit Fee Estimator carries a "Single-Family Casita with Kitchen" line at the R-3 single-family rates: for a wood-frame (Type V) casita up to 1,000 sq ft, plan check $500 + inspection/permit $933 + $55 administration = $1,488; a 1,200 sq ft unit is about $1,676 and a 1,500 sq ft unit about $1,961 (plan check adds $0.467 and inspection $0.477 per sq ft over 1,000). Zoning fees arise only if a standard cannot be met: Administrative Deviation $300; Variance $300 plus $500 notification; Special Use Permit $500 plus $500 notification; Zoning Verification Letter $100 (Department of Planning Fee Schedule, Resolution R-21-2008). Contractors need a Nevada license and a city business license before a permit issues |
| Impact Fees | No ADU exemption exists; the city's fee page lists these charges outside the permit fee, collected at issuance: sewer connection charge - the 2026 schedule (effective January 1, 2026, $3,235 per ERU) rates "Guest Quarters / Casitas" at 0.60 ERU = $1,941 per structure and a dwelling unit at 1.00 ERU = $3,235; Residential Construction Tax (park fee) of 1% of construction valuation on habitable space (the $1,000-per-unit cap the city states applies to apartments and condominiums); traffic impact fee $195 per single dwelling, exceptions reviewed by Traffic Engineering; the Clark County Transportation Tax of $1,000 per single-family dwelling unit as listed by the city; and the Desert Conservation Program fee of $550 per acre plus $58 administration only on land never previously graded. Ask Building & Safety (702-229-6251) at intake which of these it assesses on a casita; a new Las Vegas Valley Water District meter, if you want one, is a separate LVVWD charge |
For a full line-item breakdown, see our Las Vegas ADU cost guide. To confirm what you're allowed to build before you hire, review the Las Vegas ADU rules (max detached size: 50% of the principal dwelling's floor area. A detached ADU must meet the district's accessory-structure standards (LVMC 19.06.040(C)(8)): in R-1, R-SL, R-CL, R-TH, R-2, R-3, R-4 and R-MH the Table 2/3 accessory size limit is "not to exceed 50% of the floor area of the principal dwelling unit", and U, R-E and R-D carry the same 50% rule as an ADU footnote to their tables. All accessory buildings together may also cover no more than 50% of the rear yard, and total lot coverage stays within the district cap (50% in R-1). The separate 19.12.070 ceiling - no larger than the home's gross floor area - applies on top, so a detached casita is always the smaller of the two; owner-occupancy: Not required. LVMC 19.12.070 attaches only two conditions to the use (one unit per lot, no larger than the home), and the LVMC 19.18 definition lets the unit house "the occupants of the principal dwelling or their tenants, domestic employees or temporary guests", so the owner need not live in the main house to rent the casita on a long-term lease. The 2007-era condition that a Class I accessory structure could not be rented unless the principal dwelling was owner-occupied is gone. Exception to confirm: Summerlin's development standards (rev. June 2022) still say a guest house/casita "shall not be rented").
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How to Vet an ADU Builder in Las Vegas
- License: Confirm a current contractor's license in Nevada and that it's in good standing. Ask for the license number and verify it with the state board.
- ADU-specific experience: Ask how many ADUs they've completed in or near Las Vegas and request addresses or photos. ADU permitting and setbacks differ from a kitchen remodel.
- Portfolio & references: Get references from recent ADU clients and, if possible, visit a finished unit.
- Insurance: Verify general liability and workers' compensation coverage. Ask for a certificate of insurance.
- Written, detailed bid: Insist on an itemized, fixed-price or clearly-scoped bid — not a verbal estimate. It should state whether permits (Square-footage based (Building & Safety 2020 Building User Fees, Table 3-A, effective July 1, 2021 and still in force). The city's Permit Fee Estimator carries a "Single-Family Casita with Kitchen" line at the R-3 single-family rates: for a wood-frame (Type V) casita up to 1,000 sq ft, plan check $500 + inspection/permit $933 + $55 administration = $1,488; a 1,200 sq ft unit is about $1,676 and a 1,500 sq ft unit about $1,961 (plan check adds $0.467 and inspection $0.477 per sq ft over 1,000). Zoning fees arise only if a standard cannot be met: Administrative Deviation $300; Variance $300 plus $500 notification; Special Use Permit $500 plus $500 notification; Zoning Verification Letter $100 (Department of Planning Fee Schedule, Resolution R-21-2008). Contractors need a Nevada license and a city business license before a permit issues), plan check ($500 for a Type V casita up to 1,000 sq ft, then $0.467 per additional sq ft (Building & Safety Fee Tables, R-3 use group, matched by the estimator's casita line); paid with the inspection fee and a $55 administration fee. Plans must be to scale, digitally signed, and stamped by a Nevada architect or engineer unless a city or SNBO regional standard detail is used; a Nevada-licensed contractor may also draw them. Structural calculations, a soils report for structures over 599 sq ft and 2018 IECC REScheck energy calculations are checked with the plans (Residential Submittal Guideline)), and impact fees (No ADU exemption exists; the city's fee page lists these charges outside the permit fee, collected at issuance: sewer connection charge - the 2026 schedule (effective January 1, 2026, $3,235 per ERU) rates "Guest Quarters / Casitas" at 0.60 ERU = $1,941 per structure and a dwelling unit at 1.00 ERU = $3,235; Residential Construction Tax (park fee) of 1% of construction valuation on habitable space (the $1,000-per-unit cap the city states applies to apartments and condominiums); traffic impact fee $195 per single dwelling, exceptions reviewed by Traffic Engineering; the Clark County Transportation Tax of $1,000 per single-family dwelling unit as listed by the city; and the Desert Conservation Program fee of $550 per acre plus $58 administration only on land never previously graded. Ask Building & Safety (702-229-6251) at intake which of these it assesses on a casita; a new Las Vegas Valley Water District meter, if you want one, is a separate LVVWD charge) are included.
- Permit handling: Confirm they manage Las Vegas's permit process ("Administrative approval with a building permit; a code-compliant ADU has no hearing, no Special Use Permit and no neighbor notice (LVMC 19.12.040(A), 19.12.070). Steps: 1) confirm the parcel is inside city limits (much of the valley is unincorporated Clark County, Henderson or North Las Vegas) and check its zoning district and any Summerlin, Form-Based Code or HOA overlay; 2) have plans drawn - each sheet must be stamped and signed by a Nevada-registered architect or engineer, or drawn by a Nevada-licensed contractor; 3) submit electronically through the Building & Safety ePlan dashboard (required for all new residential plans since January 1, 2020) using the Residential Building Application, a site plan with property lines, setbacks and easements, construction drawings, stamped structural calculations or SNBO standard details, REScheck energy calculations, truss calculations or a deferred-submittal agreement, a soils report under one year old for any structure over 599 sq ft, and the Desert Conservation Program form on a never-graded lot; 4) plan review with correction cycles (the city lists improper setbacks and mismatched plans as the usual delays); 5) pay permit, sewer and construction-tax fees; 6) inspections (dispatch 702-229-6914) and final. The Director may require a notarized Conditional Use Verification form (LVMC 19.12.040(C)). Homeowners may pull the permit as owner-builder with a Nevada State Contractors Board owner/builder affidavit; a licensed contractor also needs a city business license", typically Not published by the city for any residential permit type; Building & Safety posts no review-turnaround target. Plan on at least one correction cycle. A Building Express Plan Review (non-refundable $550 administrative fee plus $660 per hour above regular plan-review fees, pre-review appointment from $176 per hour, 702-229-6251) lets the design team sit with the plans examiners until approval. Las Vegas builders' 2026 guides (see cost sources) put a detached casita at roughly 3-5 months from application to permit and 7-12 months from design to move-in) and who is responsible if revisions are required.
- Payment schedule: Avoid large upfront payments. A reasonable schedule ties payments to completed milestones.
Questions to Ask Before You Hire
- How many ADUs have you built in Las Vegas in the last two years?
- Is your bid fixed-price, and what would trigger a change order?
- Are permits, plan check, and utility connection fees included?
- What's a realistic timeline, including permit review (Not published by the city for any residential permit type; Building & Safety posts no review-turnaround target. Plan on at least one correction cycle. A Building Express Plan Review (non-refundable $550 administrative fee plus $660 per hour above regular plan-review fees, pre-review appointment from $176 per hour, 702-229-6251) lets the design team sit with the plans examiners until approval. Las Vegas builders' 2026 guides (see cost sources) put a detached casita at roughly 3-5 months from application to permit and 7-12 months from design to move-in) and construction?
- Who is my point of contact and how are delays communicated?
- What warranty do you provide on workmanship?
- Can you share three recent Nevada ADU client references?
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How much do ADU builders charge in Las Vegas?
ADU builders in Las Vegas typically quote $110,000-$230,000 for a new detached unit, or about $180-$330 per square foot, including design, permitting, and construction. A garage conversion runs $50,000-$120,000 and a prefab/modular ADU averages $80,000-$180,000. Add city permit and plan-review fees (Square-footage based (Building & Safety 2020 Building User Fees, Table 3-A, effective July 1, 2021 and still in force). The city's Permit Fee Estimator carries a "Single-Family Casita with Kitchen" line at the R-3 single-family rates: for a wood-frame (Type V) casita up to 1,000 sq ft, plan check $500 + inspection/permit $933 + $55 administration = $1,488; a 1,200 sq ft unit is about $1,676 and a 1,500 sq ft unit about $1,961 (plan check adds $0.467 and inspection $0.477 per sq ft over 1,000). Zoning fees arise only if a standard cannot be met: Administrative Deviation $300; Variance $300 plus $500 notification; Special Use Permit $500 plus $500 notification; Zoning Verification Letter $100 (Department of Planning Fee Schedule, Resolution R-21-2008). Contractors need a Nevada license and a city business license before a permit issues) plus impact fees of No ADU exemption exists; the city's fee page lists these charges outside the permit fee, collected at issuance: sewer connection charge - the 2026 schedule (effective January 1, 2026, $3,235 per ERU) rates "Guest Quarters / Casitas" at 0.60 ERU = $1,941 per structure and a dwelling unit at 1.00 ERU = $3,235; Residential Construction Tax (park fee) of 1% of construction valuation on habitable space (the $1,000-per-unit cap the city states applies to apartments and condominiums); traffic impact fee $195 per single dwelling, exceptions reviewed by Traffic Engineering; the Clark County Transportation Tax of $1,000 per single-family dwelling unit as listed by the city; and the Desert Conservation Program fee of $550 per acre plus $58 administration only on land never previously graded. Ask Building & Safety (702-229-6251) at intake which of these it assesses on a casita; a new Las Vegas Valley Water District meter, if you want one, is a separate LVVWD charge. Quotes for the same scope commonly vary 20-40% between builders, so collect at least three bids.
How do I find a good ADU builder in Las Vegas?
Look for a licensed contractor with completed ADU projects in Las Vegas specifically — ADUs involve local zoning, setback rules, and utility connections that general remodelers may not have handled. Verify the license, ask for an ADU-specific portfolio and references, confirm they carry liability and workers' comp insurance, and get a written fixed-price or detailed bid. Submit a request below and we'll forward it to local ADU builders serving Las Vegas for free quotes.
Do ADU builders in Las Vegas handle permits?
Most full-service ADU builders manage the permit process for you. In Las Vegas the approval process is "Administrative approval with a building permit; a code-compliant ADU has no hearing, no Special Use Permit and no neighbor notice (LVMC 19.12.040(A), 19.12.070). Steps: 1) confirm the parcel is inside city limits (much of the valley is unincorporated Clark County, Henderson or North Las Vegas) and check its zoning district and any Summerlin, Form-Based Code or HOA overlay; 2) have plans drawn - each sheet must be stamped and signed by a Nevada-registered architect or engineer, or drawn by a Nevada-licensed contractor; 3) submit electronically through the Building & Safety ePlan dashboard (required for all new residential plans since January 1, 2020) using the Residential Building Application, a site plan with property lines, setbacks and easements, construction drawings, stamped structural calculations or SNBO standard details, REScheck energy calculations, truss calculations or a deferred-submittal agreement, a soils report under one year old for any structure over 599 sq ft, and the Desert Conservation Program form on a never-graded lot; 4) plan review with correction cycles (the city lists improper setbacks and mismatched plans as the usual delays); 5) pay permit, sewer and construction-tax fees; 6) inspections (dispatch 702-229-6914) and final. The Director may require a notarized Conditional Use Verification form (LVMC 19.12.040(C)). Homeowners may pull the permit as owner-builder with a Nevada State Contractors Board owner/builder affidavit; a licensed contractor also needs a city business license". Review time: not published by the city for any residential permit type; Building & Safety posts no review-turnaround target. Plan on at least one correction cycle. A Building Express Plan Review (non-refundable $550 administrative fee plus $660 per hour above regular plan-review fees, pre-review appointment from $176 per hour, 702-229-6251) lets the design team sit with the plans examiners until approval. Las Vegas builders' 2026 guides (see cost sources) put a detached casita at roughly 3-5 months from application to permit and 7-12 months from design to move-in. Confirm in writing whether permit fees, plan check ($500 for a Type V casita up to 1,000 sq ft, then $0.467 per additional sq ft (Building & Safety Fee Tables, R-3 use group, matched by the estimator's casita line); paid with the inspection fee and a $55 administration fee. Plans must be to scale, digitally signed, and stamped by a Nevada architect or engineer unless a city or SNBO regional standard detail is used; a Nevada-licensed contractor may also draw them. Structural calculations, a soils report for structures over 599 sq ft and 2018 IECC REScheck energy calculations are checked with the plans (Residential Submittal Guideline)), and impact fees are included in the bid or billed separately.
How long does it take to build an ADU in Las Vegas?
Plan for the permit review (Not published by the city for any residential permit type; Building & Safety posts no review-turnaround target. Plan on at least one correction cycle. A Building Express Plan Review (non-refundable $550 administrative fee plus $660 per hour above regular plan-review fees, pre-review appointment from $176 per hour, 702-229-6251) lets the design team sit with the plans examiners until approval. Las Vegas builders' 2026 guides (see cost sources) put a detached casita at roughly 3-5 months from application to permit and 7-12 months from design to move-in in Las Vegas) plus construction. Most detached ADUs take 4-8 months of construction after permits are issued; garage conversions and prefab units are often faster. Ask each builder for a realistic schedule and what could delay it.
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