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Deck building · $25–$50 per sq ft
Pressure-treated pine deck cost in New Hampshire
At $25 to $50 per square foot of deck installed, a 320 sq ft job comes to $8,000–$16,000 at national rates. Adjusted for local carpenters wages it is $7,950–$15,950 in Southwestern New Hampshire nonmetropolitan area and $8,850–$17,700 in Boston-Cambridge-Newton, MA-NH.
Checked October 20, 2026 · sources
- 1Pressure-treated, US $8,000–$16,000
- 2Lowest NH area $7,950–$15,950
- 3Highest NH area $8,850–$17,700
Price in each New Hampshire labor area
Labor is about 44% of this material's installed price at national rates, so a labor index of +10% moves the total by roughly 4.4%. The carpenters index runs from −1.0% to +24.2% across the state.
| Area | Labor index | Low | High | Midpoint |
|---|---|---|---|---|
| United States | ±0.0% | $8,000 | $16,000 | $12,000 |
| New Hampshire (statewide) | +1.0% | $8,050 | $16,050 | $12,050 |
| Manchester-Nashua | +1.2% | $8,050 | $16,100 | $12,050 |
| Boston-Cambridge-Newton | +24.2% | $8,850 | $17,700 | $13,300 |
| Central NH | +1.3% | $8,050 | $16,100 | $12,050 |
| Northern NH | +1.2% | $8,050 | $16,100 | $12,050 |
| Southwestern NH | −1.0% | $7,950 | $15,950 | $11,950 |
* No BLS estimate for carpenters in that area; statewide median used.
By size
| Deck area (sq ft) | National | Southwestern NH | Boston-Cambridge-Newton |
|---|---|---|---|
| 144 sq ft | $3,600–$7,200 | $3,600–$7,150 | $4,000–$7,950 |
| 240 sq ft | $6,000–$12,000 | $5,950–$11,950 | $6,650–$13,300 |
| 320 sq ft | $8,000–$16,000 | $7,950–$15,950 | $8,850–$17,700 |
| 400 sq ft | $10,000–$20,000 | $9,950–$19,900 | $11,050–$22,150 |
Against the other deck materials
Pressure-treated pine deck is the least expensive option on this page at the midpoint. National ranges for 320 sq ft:
- Cedar deck: $9,600–$15,050
- Composite deck: $12,800–$25,600
Pressure-treated pine deck in towns with a permit page
| Town | Labor area | Estimate | Permit |
|---|---|---|---|
| Barnstead | Central NH | $8,050–$16,100 | $50 |
| Conway | Northern NH | $8,050–$16,100 | $219 |
| Durham | Boston-Cambridge-Newton | $8,850–$17,700 | $142.94 |
| Exeter | Boston-Cambridge-Newton | $8,850–$17,700 | $116.38 |
| Fitzwilliam | Southwestern NH | $7,950–$15,950 | $146 |
| Goffstown | Manchester-Nashua | $8,050–$16,100 | $40 |
| Lebanon | Northern NH | $8,050–$16,100 | $160.65 |
| Londonderry | Boston-Cambridge-Newton | $8,850–$17,700 | $131.21 |
| Manchester | Manchester-Nashua | $8,050–$16,100 | $120.63 |
| Merrimack | Manchester-Nashua | $8,050–$16,100 | $252.60 |
| New Ipswich | Manchester-Nashua | $8,050–$16,100 | $64 |
| Newbury | Central NH | $8,050–$16,100 | $164 |
| Newport | Southwestern NH | $7,950–$15,950 | $114 |
| Portsmouth | Boston-Cambridge-Newton | $8,850–$17,700 | $110 |
| Rochester | Boston-Cambridge-Newton | $8,850–$17,700 | $136 |
| Salem | Boston-Cambridge-Newton | $8,850–$17,700 | $128 |
| Somersworth | Boston-Cambridge-Newton | $8,850–$17,700 | $144.49 |
The town pages quote each schedule's own wording. For the arithmetic behind a contractor's number, see how contractors price a roof and how to compare three quotes; back to deck building cost.
Sources
- HomeGuide: Cost to build a deck (Feb 10, 2026) — “Pressure-treated pine $25 – $50 (installed, per sq ft)”.
- Labor: HomeGuide: Cost to build a deck (Feb 10, 2026) — “The labor cost to build a new deck is $11 to $22 per square foot.”.
- Wages: O*NET OnLine, Carpenters (47-2031.00), New Hampshire local wages; areas: BLS, May 2025 Metropolitan and Nonmetropolitan Area Definitions.
Ranges built from published averages, not quotes. Cost by Town does not perform or arrange work.