Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Building an ADU in Chandler costs between $125,000-$250,000 for new construction, with per-square-foot costs averaging $140-$280. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $60,000-$140,000, while prefab/modular ADUs fall in between at $85,000-$200,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | Valuation-based per Chandler fee schedule using ICC Building Valuation Data (minimum permit fee $60); third-party guides estimate roughly 1.5-2% of construction value plus plan review — confirm exact amounts with Chandler Development Services |
| Impact Fees | Confirm with Chandler Development Services |
| 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 |
Permit fees in Chandler are Valuation-based per Chandler fee schedule using ICC Building Valuation Data (minimum permit fee $60); third-party guides estimate roughly 1.5-2% of construction value plus plan review — confirm exact amounts with Chandler Development Services. The review timeline is Confirm with Chandler Development Services (480-782-3000), with plan check taking approximately Confirm with Chandler Development Services. Impact fees are Confirm with Chandler Development Services. Pre-approved plans: No city pre-approved ADU plan program identified as of June 2026 — confirm with Chandler Planning Division.
| 1-Bedroom Rent | $1,350-$1,700/month |
| 2-Bedroom Rent | $1,600-$2,000/month |
| Annual Rental Income (est.) | $18,300/year |
| Payback Period (est.) | 10.2 years |
| Short-Term Rental | Not addressed in ADU section 35-2202.2; Chandler requires short-term rental licensing citywide (City Code Chapter 22) and previously prohibited STR use of ADUs — confirm with Chandler Planning Division |
| Overall ROI Estimate | 6-9% annual return |
A typical ADU in Chandler generates approximately $18,300 per year in rental income based on average 1-bedroom rents. At an average construction cost of $187,500, the estimated payback period is 10.2 years — before accounting for property value appreciation, which typically adds 20-35% to home value.
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in Chandler: $60,000-$140,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $85,000-$200,000.
3. Pre-approved plans (No city pre-approved ADU plan program identified as of June 2026 — confirm with Chandler Planning Division) can save $3,000-$10,000 in design costs and 2-3 months in review time.
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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