Hillsborough County · Manchester-Nashua labor area · 29,325 residents
Home project costs in Merrimack, NH
What a roof, siding, deck, fence, driveway or heat pump costs in Merrimack after national installed prices are adjusted for local trade wages. 2 of the six have their own page here because the town's fee schedule sets a permit fee for them.
- 1Deck $8,050–$16,100
- 2Heat pump $11,000–$22,000
Six projects at their reference sizes
| Project | Size, material | Estimate | Permit |
|---|---|---|---|
| Roof replacement | 2,000 sq ft, architectural | $8,100–$12,250 | no line |
| Siding replacement | 1,500 sq ft, vinyl | $6,050–$18,100 | no line |
| Deck building | 320 sq ft, pressure-treated | $8,050–$16,100 | $252.60 |
| Fence installation | 150 linear ft, wood | $3,000–$7,500 | no line |
| Driveway paving | 600 sq ft, asphalt | $3,300–$7,800 | no line |
| Heat pump installation | 2,000 sq ft home, ducted air-source | $11,000–$22,000 | from $110 |
“No line” means the town's schedule, as read on October 20, 2026, sets no fee this site could apply to that work; the building department can say whether a permit is needed.
Labor index by trade
Hillsborough County sits in the Manchester-Nashua, NH. Each project's labor is scaled by the trade that does it:
| Trade | Local median | US median | Index |
|---|---|---|---|
| Roofers | $27.68 | $26.65 | +3.9% |
| Carpenters | $29.47 | $29.12 | +1.2% |
| Construction laborers | $22.84 | $22.66 | +0.8% |
| Paving, surfacing and tamping equipment operators | $29.88 | $25.64 | +16.5% |
| Cement masons and concrete finishers | $27.38 | $27.41 | −0.1% |
| HVAC mechanics and installers | $35.14 | $29.33 | +19.8% |
* BLS publishes no estimate for this trade in the Manchester-Nashua area; New Hampshire statewide median used. Wages: BLS 2025 wage data via O*NET OnLine.
Merrimack in numbers
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 town's permit schedule
Read from Town of Merrimack, NH Code Enforcement & Inspection Fee Schedule (effective January 1, 2025). The lines this site uses:
“Application fee: Applies to all permits below (non-refundable) $35.00”
“Accessory Structure (porches, decks, sheds, etc.) $0.68/sq. ft.”
“Furnace, Boiler, Mini Splits, etc. (total system change) $75.00”
“HVAC Duct or AC line to Furnace, Mini Splits, etc. $75.00”
Nearby towns
Same labor area (Manchester-Nashua): Goffstown · Hudson · Manchester · New Ipswich.
All towns: town list · Guides: permit fees by town, labor costs in New Hampshire
Population: NH Office of Planning and Development, 2025 Population Estimates of New Hampshire Cities and Towns (published July 17, 2026); housing: Census QuickFacts, Merrimack (ACS 2020-2024). Checked October 20, 2026. Estimates are ranges from published averages, not quotes.