Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Fort Worth ADU cost →Building an ADU in Fort Worth costs between $120,000-$240,000 for new construction, with per-square-foot costs averaging $120-$240. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $55,000-$135,000, while prefab/modular ADUs fall in between at $85,000-$195,000.
A detached ADU in Fort Worth typically runs $120,000-$240,000 all-in for new construction ($120-$240 per sq ft). A garage conversion is the cheapest path at $55,000-$135,000, and a prefab ADU averages $85,000-$195,000. Add the city building permit and plan review ($2,400-$4,000 (building permit + plan review; varies with valuation and square footage)) and roughly $1,000-$1,800 typical water/sewer connection charges (confirm with Fort Worth Water) in water/sewer connection charges. Fort Worth caps a detached ADU at 1,000 sq ft under Zoning Ordinance §5.301, so most homeowners land in the lower-to-middle of these ranges. Texas has no statewide ADU subsidy or impact-fee waiver, so plan for the full permit and utility costs.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | $2,400-$4,000 (building permit + plan review; varies with valuation and square footage) |
| Impact Fees | $1,000-$1,800 typical water/sewer connection charges (confirm with Fort Worth Water) |
| 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 Fort Worth — no obligation.
Get Fort Worth builder quotes →Permit fees in Fort Worth are $2,400-$4,000 (building permit + plan review; varies with valuation and square footage). The review timeline is About 4–9 weeks from complete application to permit issuance (confirm current queue with Development Services), with plan check: 2-3 weeks. Impact fees are $1,000-$1,800 typical water/sewer connection charges (confirm with Fort Worth Water). Pre-approved plans: No formal pre-approved ADU plan set; standard plan review applies.
| 1-Bedroom Rent | $1,100-$1,650/month |
| 2-Bedroom Rent | $1,400-$2,100/month |
| Annual Rental Income (est.) | $16,500/year |
| Payback Period (est.) | 10.9 years |
| Short-Term Rental | Restricted in most areas |
| Overall ROI Estimate | 6-9% annual return |
A typical ADU in Fort Worth generates approximately $16,500 per year in rental income based on average 1-bedroom rents. At an average construction cost of $180,000, the estimated payback period is 10.9 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Fort Worth 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 Fort Worth: $55,000-$135,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $85,000-$195,000.
3. Pre-approved plans — Fort Worth 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.
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