Home / Deck building cost / Merrimack, NH
Merrimack · Hillsborough County · labor +1.2%
Deck building cost in Merrimack, NH
A 320 sq ft deck in pressure-treated pine deck comes to about $8,050 to $16,100 in Merrimack once the national installed price is adjusted for what carpenters earn locally. The town's fee schedule names this work puts the permit at $252.60 for a job at the midpoint.
Figures checked October 20, 2026 · sources
- 1Pressure-treated, 320 sq ft $8,050–$16,100
- 2Labor index +1.2% vs US
- 3Merrimack permit $252.60
Change size or material All Merrimack projects
Deck building prices in Merrimack by material
Each row starts from the installed price per square foot of deck published in a national cost guide, then moves only the labor part of that price by Merrimack's labor index. For 320 sq ft:
| Material | National | Merrimack | Midpoint |
|---|---|---|---|
| Pressure-treated pine deck | $8,000–$16,000 | $8,050–$16,100 | $12,050 |
| Cedar deck | $9,600–$15,050 | $9,650–$15,100 | $12,400 |
| Composite deck | $12,800–$25,600 | $12,850–$25,700 | $19,250 |
By size
| Deck area (sq ft) | Merrimack estimate | Permit at midpoint |
|---|---|---|
| 144 sq ft | $3,600–$7,250 | $132.92 |
| 240 sq ft | $6,050–$12,050 | $198.20 |
| 320 sq ft | $8,050–$16,100 | $252.60 |
| 400 sq ft | $10,050–$20,100 | $307 |
Pressure-treated pine deck.
Permit fee in Merrimack
Named in the schedule The fee schedule names this kind of work.
“Accessory Structure (porches, decks, sheds, etc.) $0.68/sq. ft.”
“Application fee: Applies to all permits below (non-refundable) $35.00”
Applied to a 320 sq ft deck estimated at $8,050 to $16,100, that gives $252.60 to $252.60, about 2.09% of the midpoint price. Among the 17 towns on this site whose schedules cover this work, Merrimack ranks 17 from the cheapest; Goffstown is lowest at $40 and Merrimack highest at $252.60 for its own midpoint job.
Schedule: Town of Merrimack, NH Code Enforcement & Inspection Fee Schedule (effective January 1, 2025). The building department decides whether a permit is required and what valuation it accepts; the national guide puts deck permits at $50–$150.
Why Merrimack differs from the national price
Merrimack is in Hillsborough County, which the Bureau of Labor Statistics counts in the Manchester-Nashua, NH metropolitan area. The median wage there for carpenters is $29.47 an hour against $29.12 nationally, so the labor part of a national price is scaled by 1.012 (+1.2%).
On this job the labor portion is $3,500 to $7,050 at national rates and $3,550 to $7,100 at Merrimack rates, so the midpoint rises $60 above the national figure. Against the New Hampshire statewide wage it is $10 higher. Materials are priced at the national figure: shingle, lumber and equipment prices are set by distributors, not by a town.
A second published benchmark points the same way for the region: Remodeling's 2025 Cost vs Value report prices its “Deck Addition, Wood” job at $18,250 nationally and $20,600 in New England, and its “Deck Addition, Composite” job at $25,100 nationally and $25,800 in New England. Those are fixed specification jobs, not per-square-foot prices, so they are shown for comparison only.
Merrimack at a glance
Merrimack had 29,325 residents in the state's 2025 estimate, up 15% from 25,494 in 2010, faster than the state's 7.5% over the same years. Its density of 909 people per square mile puts it 6 of 19 among the towns on this site.
88.9% of Merrimack's occupied homes are lived in by their owners, more than the 72.8% statewide, and the median owner-occupied home is valued at $458,600 (New Hampshire: $402,500). The midpoint estimate for this deck works out to 2.6% of that median value.
Before asking for quotes
- The Merrimack building department can say for free whether this job needs a permit and what it will cost; the schedule linked above is its own published document.
- Written quotes that list the same scope (area, material line, removal, disposal, permit) can be compared line by line; the quote comparison guide walks through it with these numbers.
- A quote far below $8,050 or above $16,100 is not wrong in itself, but it is worth asking what it includes or leaves out.
Other projects in Merrimack
Heat pump installation cost in Merrimack
Deck building in nearby towns
| Town | Labor area | Estimate | Permit |
|---|---|---|---|
| Goffstown | Manchester-Nashua | $8,050–$16,100 | $40 |
| Manchester | Manchester-Nashua | $8,050–$16,100 | $120.63 |
| New Ipswich | Manchester-Nashua | $8,050–$16,100 | $64 |
| Barnstead | Central NH | $8,050–$16,100 | $50 |
| Conway | Northern NH | $8,050–$16,100 | $219 |
More: all deck building town pages · permit fees by town · labor costs in New Hampshire
Sources
- Installed price: HomeGuide: Cost to build a deck (Feb 10, 2026) — “Pressure-treated pine $25 – $50 (installed, per sq ft)”.
- Labor portion: HomeGuide: Cost to build a deck (Feb 10, 2026) — “The labor cost to build a new deck is $11 to $22 per square foot.”.
- Labor index: O*NET OnLine, Carpenters (47-2031.00), New Hampshire local wages; area definitions: BLS, May 2025 Metropolitan and Nonmetropolitan Area Definitions.
- Permit: Town of Merrimack, NH Code Enforcement & Inspection Fee Schedule.
- Population: NH Office of Planning and Development, 2025 Population Estimates of New Hampshire Cities and Towns (published July 17, 2026); housing: Census QuickFacts, Merrimack.
All figures checked October 20, 2026. Estimates are ranges built from published averages, not quotes; a contractor's price depends on the house, access, the season and the scope written into the quote. Cost by Town does not perform or arrange work.