Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Chandler ADU cost →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 |
Quotes for the same ADU commonly vary 20–40% between builders. Get up to 3 free quotes from ADU builders serving Chandler — no obligation.
Get Chandler builder quotes →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: 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 the resale value the ADU adds, which an appraiser determines from comparable sales in Chandler 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 Chandler: $60,000-$140,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $85,000-$200,000.
3. Pre-approved plans — Chandler does not offer a pre-approved/standard ADU plan program yet, so budget for custom architectural plans (typically $3,000-$15,000).
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.
Compare prices from local ADU contractors in your area. Free, no-obligation estimates.
Find ADU Contractors →