Home Addition Cost in New Hampshire
Updated July 2026 · Based on New Hampshire contractor data
$44,800
Low Estimate
$89,600
State Average
$161,280
High Estimate
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Total Cost
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Cost per Sq Ft
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Home Addition Costs in New Hampshire (400 sq ft)
| Addition Type | Cost in NH | Per Sq Ft | National |
|---|---|---|---|
| Bedroom | $51,520 | $129/sqft | $46,000 |
| Bathroom | $98,560 | $246/sqft | $88,000 |
| Garage | $31,360 | $78/sqft | $28,000 |
| Sunroom | $62,720 | $157/sqft | $56,000 |
| Second Story | $129,920 | $325/sqft | $116,000 |
| Adu | $103,040 | $258/sqft | $92,000 |
Home Additions in New Hampshire
Home addition costs in New Hampshire run above the national average. Higher material and labor costs in New Hampshire increase total project budgets.
What's Included in Home Addition Costs
- • Design and architectural drawings: $2,000–$8,000
- • Permits and inspections: $1,680–$5,600
- • Foundation: $5,600–$22,400 depending on type
- • Framing, roofing, exterior: $28–$67/sqft
- • Interior finishes: $45–$134/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 New Hampshire
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Get Free Quotes →Frequently Asked Questions
How much does a home addition cost in New Hampshire?
Home additions in New Hampshire cost $44,800–$161,280, with an average around $89,600.
How much does it cost to add a bedroom?
Adding a bedroom in New Hampshire costs $51,520–$72,128 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 $31,360–$62,720 for 400 sq ft.