Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Scottsdale ADU cost →Building an ADU in Scottsdale costs between $160,000-$320,000 for new construction, with per-square-foot costs averaging $200-$400. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $80,000-$165,000, while prefab/modular ADUs fall in between at $155,000-$300,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | 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. |
| Site Prep & Foundation | $10,000 – $35,000 |
| Framing & Structure | $15,000 – $45,000 |
| Plumbing | $8,000 – $20,000 |
| Electrical | $5,000 – $15,000 |
| HVAC | $3,000 – $8,000 |
| Interior Finishes | $15,000 – $40,000 |
Quotes for the same ADU commonly vary 20–40% between builders. We pass your request to up to 5 local builders serving Scottsdale, where we have them — free, no obligation.
Get Scottsdale builder quotes →Permit fees in Scottsdale are 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.. The review timeline is 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., with 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)).. Impact fees are 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.. Pre-approved plans: None posted. As of September 2026 the city's ADU page and fee schedules list no pre-approved ADU plan set (the 'Single Family Standard Plan' fee line is for production-builder repeats). ARS 9-461.20 (SB 1529 of 2025) requires every Arizona city to offer at least three pre-approved ADU plans at 200, 600 and 1,000 sq ft from July 1, 2026 and to accept outside submissions, so ask the One Stop Shop (480-312-7725) whether Scottsdale's are available..
| 1-Bedroom Rent | $1,650-$2,250/month |
| 2-Bedroom Rent | $1,950-$2,600/month |
| Annual Rental Income (est.) | $23,400/year |
| Payback Period (est.) | 10.3 years |
| Short-Term Rental | Yes, with a Scottsdale short-term rental license for the property (Ordinance 4566; state law caps the fee at $250) and only if the owner physically resides on the property: Sec. |
| Overall ROI Estimate | Roughly 6-10% gross rental yield on a $160,000-$320,000 detached build at $1,700-$2,200/mo, before taxes, vacancy, insurance and financing |
A typical ADU in Scottsdale generates approximately $23,400 per year in rental income based on average 1-bedroom rents. At an average construction cost of $240,000, the estimated payback period is 10.3 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Scottsdale and varies by market (often less than build cost).
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in Scottsdale: $80,000-$165,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $155,000-$300,000.
3. Pre-approved plans — available in Scottsdale, which can save $3,000-$10,000 in design costs and 2-3 months in review time. See which cities offer pre-approved ADU plans.
4. State grants — California's CalHFA ADU grant (up to $40K) is currently paused; check calhfa.ca.gov/adu for status and your state for active programs.
5. Get multiple bids — ADU contractor pricing varies 20-40% for the same project. We recommend getting at least 3 quotes.
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