Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Dallas ADU cost →Building an ADU in Dallas costs between $130,000-$320,000 for new construction, with per-square-foot costs averaging $250-$400. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $30,000-$100,000, while prefab/modular ADUs fall in between at $150,000-$300,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | $1,200-$1,400 building permit for a 600-1,000 sq ft unit: Table A-I ($1.07 per sq ft up to 700 sq ft; $0.34569 per sq ft plus $300 above) plus $577 plan review, $25 handling and $15 technology fee (fee schedule of July 1, 2025); Board of Adjustment special exception $600 (Ch. 52 Sec. 303.12.1.4). |
| Impact Fees | None listed. No water, wastewater or transportation impact fee appears in the city's Permit Fee Schedule (July 1, 2025) or in Ch. 52 Sec. 303; a unit on the house's existing meter pays no connection charge. A separate water or sewer tap and meter is billed by Dallas Water Utilities at its own rates, so ask before adding a second service. |
| 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 Dallas, where we have them — free, no obligation.
Get Dallas builder quotes →Permit fees in Dallas are $1,200-$1,400 building permit for a 600-1,000 sq ft unit: Table A-I ($1.07 per sq ft up to 700 sq ft; $0.34569 per sq ft plus $300 above) plus $577 plan review, $25 handling and $15 technology fee (fee schedule of July 1, 2025); Board of Adjustment special exception $600 (Ch. 52 Sec. 303.12.1.4).. The review timeline is Not published. Ch. 52 Sec. 302.1.1 requires a completeness check within 10 business days of filing; a Board of Adjustment case goes on a monthly docket after acceptance, so allow one to two months on that route before permit review. Confirm review times with Development Services, 214-948-4480., with plan check: $577 minimum residential plan review ($0.046 per sq ft, Ch. 52 Sec. 303.5.1.2), included in the permit figure above; each plan revision after issuance $100 per hour per trade; completeness check within 10 business days (Sec. 302.1.1).. Impact fees are None listed. No water, wastewater or transportation impact fee appears in the city's Permit Fee Schedule (July 1, 2025) or in Ch. 52 Sec. 303; a unit on the house's existing meter pays no connection charge. A separate water or sewer tap and meter is billed by Dallas Water Utilities at its own rates, so ask before adding a second service.. Pre-approved plans: None. Dallas publishes no pre-approved ADU plan set; the only expedited residential option listed on the Building Inspection Residential page is the Rapid Single Family VIP (RSVP) review..
| 1-Bedroom Rent | $1,300-$1,550/month |
| 2-Bedroom Rent | $1,750-$1,900/month |
| Annual Rental Income (est.) | $17,100/year |
| Payback Period (est.) | 13.2 years |
| Short-Term Rental | Regulated separately. Every short-term rental must be registered with the city under Chapter 42B (Secs. 42B-4 to 42B-6, fees under Sec. 42B-5), and an ADU approved under Sec. 51A-4.510 or Sec. |
| Overall ROI Estimate | 5-15% gross yield: $1,300-$1,900 a month on a $130,000-$320,000 build, before taxes, vacancy, financing and the annual $74 rental registration |
A typical ADU in Dallas generates approximately $17,100 per year in rental income based on average 1-bedroom rents. At an average construction cost of $225,000, the estimated payback period is 13.2 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Dallas 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 Dallas: $30,000-$100,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $150,000-$300,000.
3. Pre-approved plans — available in Dallas, 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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