Home / Towns / Londonderry, NH
Rockingham County · Boston-Cambridge-Newton labor area · 28,437 residents
Home project costs in Londonderry, NH
What a roof, siding, deck, fence, driveway or heat pump costs in Londonderry after national installed prices are adjusted for local trade wages. 4 of the six have their own page here because the town's fee schedule sets a permit fee for them.
- 1Roof $8,600–$13,200
- 2Siding $6,750–$20,200
- 3Deck $8,850–$17,700
- 4Heat pump $11,450–$22,850
Six projects at their reference sizes
| Project | Size, material | Estimate | Permit |
|---|---|---|---|
| Roof replacement | 2,000 sq ft, architectural | $8,600–$13,200 | $112.09 |
| Siding replacement | 1,500 sq ft, vinyl | $6,750–$20,200 | $132.60 |
| Deck building | 320 sq ft, pressure-treated | $8,850–$17,700 | $131.21 |
| Fence installation | 150 linear ft, wood | $3,250–$8,300 | no line |
| Driveway paving | 600 sq ft, asphalt | $3,500–$8,200 | no line |
| Heat pump installation | 2,000 sq ft home, ducted air-source | $11,450–$22,850 | from $75 |
“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
Rockingham County sits in the Boston-Cambridge-Newton, MA-NH. Each project's labor is scaled by the trade that does it:
| Trade | Local median | US median | Index |
|---|---|---|---|
| Roofers | $31.90 | $26.65 | +19.7% |
| Carpenters | $36.16 | $29.12 | +24.2% |
| Construction laborers | $30.49 | $22.66 | +34.6% |
| Paving, surfacing and tamping equipment operators | $32.94 | $25.64 | +28.5% |
| Cement masons and concrete finishers | $30.23 | $27.41 | +10.3% |
| HVAC mechanics and installers | $37.75 | $29.33 | +28.7% |
* BLS publishes no estimate for this trade in the Boston-Cambridge-Newton area; New Hampshire statewide median used. Wages: BLS 2025 wage data via O*NET OnLine.
The Boston-Cambridge-Newton area BLS uses for Rockingham County is mostly Massachusetts, where trade wages run higher than in New Hampshire. The statewide New Hampshire medians are shown on each project page next to the area figure, so the gap is visible rather than hidden in one number.
Londonderry in numbers
Londonderry had 28,437 residents in the state's 2025 estimate, up 17.9% from 24,129 in 2010, faster than the state's 7.5% over the same years. Its density of 656 people per square mile puts it 10 of 19 among the towns on this site.
85.6% of Londonderry's occupied homes are lived in by their owners, more than the 72.8% statewide, and the median owner-occupied home is valued at $505,200 (New Hampshire: $402,500).
The town's permit schedule
Read from Town of Londonderry Building Department, Permitting Fee Schedule (effective 11/4/25). The lines this site uses:
“Application Fee $25 Charged for all permits”
“Additions / Alterations / Renovation $8 Per thousand”
“Deck $8 Per thousand”
“Minimum Residential Permit Fee $50”
“Residential Mechanical: Any Residential $50 base + $10 per additional item”
Nearby towns
Same labor area (Boston-Cambridge-Newton): Durham · Exeter · Portsmouth · Rochester · Salem · Somersworth.
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, Londonderry (ACS 2020-2024). Checked October 20, 2026. Estimates are ranges from published averages, not quotes.