Home Addition Cost in Rhode Island
Updated June 2026 · Based on Rhode Island contractor data
$47,200
Low Estimate
$94,400
State Average
$169,920
High Estimate
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Total Cost
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Cost per Sq Ft
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Home Addition Costs in Rhode Island (400 sq ft)
| Addition Type | Cost in RI | Per Sq Ft | National |
|---|---|---|---|
| Bedroom | $54,280 | $136/sqft | $46,000 |
| Bathroom | $103,840 | $260/sqft | $88,000 |
| Garage | $33,040 | $83/sqft | $28,000 |
| Sunroom | $66,080 | $165/sqft | $56,000 |
| Second Story | $136,880 | $342/sqft | $116,000 |
| Adu | $108,560 | $271/sqft | $92,000 |
Home Additions in Rhode Island
Home addition costs in Rhode Island run above the national average. Higher material and labor costs in Rhode Island increase total project budgets.
What's Included in Home Addition Costs
- • Design and architectural drawings: $2,000–$8,000
- • Permits and inspections: $1,770–$5,900
- • Foundation: $5,900–$23,600 depending on type
- • Framing, roofing, exterior: $30–$71/sqft
- • Interior finishes: $47–$142/sqft
Planning Tips
- • Budget 10–20% contingency for unexpected issues
- • Get quotes from at least 3 licensed general contractors
- • Confirm zoning setback requirements before designing
- • Consider financing options: HELOC rates vary by state
Get Free Home Addition Quotes in Rhode Island
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Get Free Quotes →Frequently Asked Questions
How much does a home addition cost in Rhode Island?
Home additions in Rhode Island cost $47,200–$169,920, with an average around $94,400.
How much does it cost to add a bedroom?
Adding a bedroom in Rhode Island costs $54,280–$75,992 for a typical 400 sq ft room.
Is a home addition worth it?
Home additions typically recoup 50–80% of cost at resale. ADUs offer the best ROI through rental income potential.
How long does a home addition take?
A bedroom/bathroom addition takes 1–3 months. A second-story addition or ADU takes 3–6 months. Include 4–8 weeks for permitting.
What is the cheapest type of home addition?
A garage or sunroom addition is typically cheapest at $33,040–$66,080 for 400 sq ft.