Home Addition Cost in Maine
Updated October 2026 · Based on Maine contractor data
$39,200
Low Estimate
$78,400
State Average
$141,120
High Estimate
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Total Cost
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Cost per Sq Ft
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Home Addition Costs in Maine (400 sq ft)
| Addition Type | Cost in ME | Per Sq Ft | National |
|---|---|---|---|
| Bedroom | $45,080 | $113/sqft | $46,000 |
| Bathroom | $86,240 | $216/sqft | $88,000 |
| Garage | $27,440 | $69/sqft | $28,000 |
| Sunroom | $54,880 | $137/sqft | $56,000 |
| Second Story | $113,680 | $284/sqft | $116,000 |
| Adu | $90,160 | $225/sqft | $92,000 |
Home Additions in Maine
Home addition costs in Maine run near the national average. Maine construction costs align with U.S. averages.
What's Included in Home Addition Costs
- • Design and architectural drawings: $2,000–$8,000
- • Permits and inspections: $1,470–$4,900
- • Foundation: $4,900–$19,600 depending on type
- • Framing, roofing, exterior: $25–$59/sqft
- • Interior finishes: $39–$118/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
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Get Free Quotes →Frequently Asked Questions
How much does a home addition cost in Maine?
Home additions in Maine cost $39,200–$141,120, with an average around $78,400.
How much does it cost to add a bedroom?
Adding a bedroom in Maine costs $45,080–$63,112 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 $27,440–$54,880 for 400 sq ft.