Can You Build an ADU in Providence?
Yes — Providence is governed by Rhode Island's statewide ADU law, which limits what the city can restrict. A 700 sq ft detached ADU here runs about $172,500–$282,000.
Construction costs in Providence track close to the Rhode Island state average.
Detached ADU (700 sq ft)
$172,500–$282,000
Garage conversion (400 sq ft)
$54,000–$98,500
Statewide protection
Yes
What applies in Providence
Rhode Island's 2024 zoning reforms require municipalities to permit one ADU on lots with an existing single-family home, subject to limited local standards.
Because Rhode Island has a statewide ADU law (R.I. Gen. Laws §45-24-37 (2024)), Providence must follow these minimums even where its older zoning code is stricter. Confirm fees and design standards with the Providence planning department.
Estimate your Providence ADU cost
Your property
ADU typeEstimated cost in Rhode Island
$172,500 – $282,000
≈ $246–$403/sq ft turnkey · midpoint $227,500
- $154,600
- Construction
- $41,000
- Design & permits
- $31,900
- Site work
- iSize set locally. This state leaves ADU size limits to your city — typical caps run 600–1,200 sq ft. Check your local code.
- ✓No extra parking likely required. Set by local ordinance — commonly 1 space per ADU unless near transit.
- iOwner-occupancy varies. Owner-occupancy rules are set locally in this state.
- ✓Lot has room. A 700 sq ft ADU uses about 12% of your 6,000 sq ft lot — comfortably within typical coverage limits.
Rule basis: R.I. Gen. Laws §45-24-37 (2024)
If you rent it out
$1,200–$1,950
est. rent/mo
8.3%
gross yield
12.9 yrs
payback
~$17,577/yr after a 7% vacancy allowance, before financing & maintenance.
Financed over 20 yrs at 7.5%, the build is about $1,833/mo — vs ~$1,575/mo in estimated rent.
Estimates are for planning only and are based on regional construction-cost indices and published statewide ADU statutes. Local ordinances, lot conditions and contractor pricing vary — always confirm with your city planning department and a licensed contractor.
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Other Rhode Island cities
Estimates are for planning only and are based on regional construction-cost indices and published statewide ADU statutes. Local ordinances, lot conditions and contractor pricing vary — always confirm with your city planning department and a licensed contractor.