An ADU builder in Henderson 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 Henderson'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 Henderson [14][15][16]
Based on our Henderson 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-$260,000 |
| Cost per Sq Ft | $180-$330 |
| Garage Conversion | $50,000-$120,000 |
| Prefab / Modular ADU (installed) | $80,000-$180,000 |
| City Permit & Plan Review | No ADU line in the DSC fee schedule (eff. 10/1/2025). Closest rows: Accessory Building - Residential at 1,000 sq ft = $1,303 plan check + $1,266 inspection (MPE included); Single-Family Addition at 1,000 sq ft = $1,601 + $1,555. Confirm the fee category at intake. |
| Impact Fees | Not published for ADUs. Henderson has a Residential Construction Tax chapter (HMC 19.17); whether it and any utility connection charges are assessed on an ADU is determined at intake. Confirm with the Development Services Center. |
For a full line-item breakdown, see our Henderson ADU cost guide. To confirm what you're allowed to build before you hire, review the Henderson ADU rules (max detached size: the greater of 25% of the principal dwelling's floor area or 1,000 sq ft, a guaranteed minimum, not a cap (Sec. 19.9.4.B.6.b.ii). Tiny-house ADUs max 400 sq ft excluding lofts; an attached garage doesn't count toward ADU size. The separate accessory-structure cap (greater of 10% of the lot or 50% of the home's livable area, Sec. 19.9.3.C.4.b) also applies to all accessory buildings combined.; owner-occupancy: Not required; no owner-occupancy condition appears in the ADU standards (Sec. 19.9.4.B.6), making Henderson the Las Vegas Valley exception. Occupancy follows the Code's “family unit” rule (Ch. 19.37): any number of related people, or up to 6 unrelated people. The ADU may not be sold apart from the main house (19.9.4.B.6.b.vi).).
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How to Vet an ADU Builder in Henderson
- 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 Henderson 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 (No ADU line in the DSC fee schedule (eff. 10/1/2025). Closest rows: Accessory Building - Residential at 1,000 sq ft = $1,303 plan check + $1,266 inspection (MPE included); Single-Family Addition at 1,000 sq ft = $1,601 + $1,555. Confirm the fee category at intake.), plan check (Plan check is priced with inspection in DSC Table A (eff. 10/1/2025) and includes mechanical, plumbing and electrical review: $1,079 at 200 sq ft, $1,164 at 600 sq ft, $1,303 at 1,000 sq ft for a residential accessory building. Planning-side fees, if needed: Design Review $274, Administrative Adjustment $164, Zoning Verification Letter $109 (eff. 8/1/2025).), and impact fees (Not published for ADUs. Henderson has a Residential Construction Tax chapter (HMC 19.17); whether it and any utility connection charges are assessed on an ADU is determined at intake. Confirm with the Development Services Center.) are included.
- Permit handling: Confirm they manage Henderson's permit process ("No conditional use permit or hearing: ADUs are permitted subject to the Sec. 19.9.4.B.6 standards, so the path is a building permit through the Development Services Center (240 S. Water St.; online applications via the city's permit portal). The design-compatibility standard (materials, colors, mass) is checked with the permit. Virtual counter appointments are offered; ask whether your permit qualifies for over-the-counter review.", typically Not published for residential permits. The DSC offers over-the-counter review for qualifying permits and an expedited-review option; ask at intake for the current turnaround.) 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 Henderson 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 for residential permits. The DSC offers over-the-counter review for qualifying permits and an expedited-review option; ask at intake for the current turnaround.) 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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