An ADU builder in Scottsdale 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 Scottsdale's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in Arizona.
What ADU Builders Cost in Scottsdale [14][15][16][17]
Based on our Scottsdale 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) | $160,000-$320,000 |
| Cost per Sq Ft | $200-$400 |
| Garage Conversion | $80,000-$165,000 |
| Prefab / Modular ADU (installed) | $155,000-$300,000 |
| City Permit & Plan Review | FY2026/27 schedule (Res. 13661, from July 1, 2026): pre-application $131, ADU staff-approval review $131, permit $237 base plus $0.94/sq ft livable and $0.54/sq ft covered, plan review $0.54 and $0.34/sq ft, CO $195, GIS $379: about $1,800 for 500 sq ft, $2,550 for 1,000 sq ft. |
| Impact Fees | Scottsdale's development (impact) fees are water and wastewater only, charged per new meter: $8,836 water plus $6,028 wastewater = $14,864 for a 5/8-1 in. meter (Schedule #09-15-25, effective September 15, 2025; Scottsdale Revised Code Sec. 49-82). Sec. 7.900 has the ADU branch off the house's existing water and sewer tap on private property, so a standard ADU should not add a meter; confirm with Water Resources (480-312-5685) before budgeting. |
For a full line-item breakdown, see our Scottsdale ADU cost guide. To confirm what you're allowed to build before you hire, review the Scottsdale ADU rules (max detached size: First ADU on the lot: 1,000 sq ft or 75% of the existing main house, whichever is less (Sec. 7.900; ARS 9-461.18 measures interior habitable area). The second and any third ADU: 500 sq ft each. Every ADU needs a private outdoor living space at least 5 ft deep and 50 sq ft, and no more than 6 adults may live in the house and ADUs combined.; owner-occupancy: Not required for a long-term rental: the house and the ADU may be leased separately for 90 days or month-to-month (ARS 9-461.18(B)(1)-(2)). The owner must reside on the premises if the house or any ADU is rented or offered as a vacation or short-term rental (Sec. 7.900 and 7.203; authority ARS 9-500.39(B)(9)). An ADU cannot be sold separately or split off by subdivision or condominium plat.).
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How to Vet an ADU Builder in Scottsdale
- License: Confirm a current contractor's license in Arizona 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 Scottsdale 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 (FY2026/27 schedule (Res. 13661, from July 1, 2026): pre-application $131, ADU staff-approval review $131, permit $237 base plus $0.94/sq ft livable and $0.54/sq ft covered, plan review $0.54 and $0.34/sq ft, CO $195, GIS $379: about $1,800 for 500 sq ft, $2,550 for 1,000 sq ft.), plan check (Full residential plan review in SPUR: an administrative completeness check (7 business days), then substantive review by Planning, Building, Engineering, Stormwater and Fire (15 business days); corrections restart the cycle. Fees are charged on both conditioned and covered square footage, and grading/drainage sheets are priced per sheet by landform. ESL lots add NAOS, native-plant and wash review; a lot in a special flood hazard area needs a $363 lowest-floor certificate review. State law bars a fire-sprinkler or commercial-code requirement for an ADU (ARS 9-461.18(D)).), and impact fees (Scottsdale's development (impact) fees are water and wastewater only, charged per new meter: $8,836 water plus $6,028 wastewater = $14,864 for a 5/8-1 in. meter (Schedule #09-15-25, effective September 15, 2025; Scottsdale Revised Code Sec. 49-82). Sec. 7.900 has the ADU branch off the house's existing water and sewer tap on private property, so a standard ADU should not add a meter; confirm with Water Resources (480-312-5685) before budgeting.) are included.
- Permit handling: Confirm they manage Scottsdale's permit process ("Three steps under Sec. 7.900, all in the Scottsdale SPUR portal (which replaced eServices on January 6, 2026): 1) online Pre-Application ($131) with a site plan, elevations and utility information, then a 30-60 minute meeting with a planner, usually scheduled within a week; 2) formal administrative application for Development Review - Staff Approval (ADU line, $131), with no public hearing, Development Review Board or use permit (ARS 9-461.18 'permitted use'); 3) building permit with construction documents through Residential Plan Review (Planning, Building, Engineering, Stormwater and Fire). The ADU gets its own address and separate electric and gas meters. One Stop Shop, 7447 E. Indian School Rd, 480-312-7725.", typically No ADU-specific figure is published. Residential Plan Review targets 7 business days for the administrative completeness check and 15 business days for substantive review per cycle; the pre-application meeting is usually scheduled within a week. Allow for at least one correction cycle.) 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 Scottsdale 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 (No ADU-specific figure is published. Residential Plan Review targets 7 business days for the administrative completeness check and 15 business days for substantive review per cycle; the pre-application meeting is usually scheduled within a week. Allow for at least one correction cycle.) 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 Arizona ADU client references?
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