Spray Foam Insulation cost: Derry Village vs Dover (2026)
Derry Village and Dover are a near-perfect match on spray foam insulation cost in 2026, both landing around $4,150.
Derry Village NH
Typically around $4,150
Dover NH
Typically around $4,150
Derry Village vs Dover: full breakdown
| Factor | Derry Village | Dover |
|---|---|---|
| Typical 2026 cost | $4,150 | $4,150 |
| Estimated range | $1,650–$6,650 | $1,650–$6,650 |
| Labor index (vs US) | ×1.04 | ×1.04 |
| Climate zone | Cold | Cold |
| Climate factor | ×1.06 | ×1.06 |
| Local permit | None | None |
| Labor share | $2,300 | $2,300 |
| Materials/equipment | $1,850 | $1,850 |
Treat these as 2026 localized estimates for spray foam insulation, not quotes from a contractor.
Basically a tie — focus on the contractor
This is a statistical tie on spray foam insulation cost, so let contractor reputation and project timing decide, not geography.
Spray foam insulation by type: Derry Village vs Dover
We localize each spray foam insulation type separately for both metros, applying the same labor, climate and permit adjustments each time, so you're comparing like for like.
| Type | Derry Village | Dover |
|---|---|---|
| Open-cell | $1,650–$5,000 | $1,650–$5,000 |
| Closed-cell | $2,750–$7,750 | $2,750–$7,750 |
Localized 2026 planning estimates — not quotes. Each city adjusts the national spray foam insulation range for local labor, climate and permits.
Spray foam insulation by area: Derry Village vs Dover
Spray foam is priced by board foot (1 sq ft at 1 inch thick), which works out to about $1.50–$5 per sq ft of surface installed depending on foam type and thickness. Closed-cell costs more but adds twice the R-value per inch.
| Size | Derry Village | Dover |
|---|---|---|
| 500 sq ft | $1,000–$2,650 | $1,000–$2,650 |
| 1,000 sq ft | $1,650–$4,450 | $1,650–$4,450 |
| 1,500 sq ft | $2,450–$6,100 | $2,450–$6,100 |
| 2,000+ sq ft | $3,100–$7,200 | $3,100–$7,200 |
All figures are 2026 localized planning estimates for spray foam insulation — get an actual quote before you commit.
Cheapest time for spray foam insulation in either city
Fall is when everyone rushes to insulate before winter hits, making it the busiest and priciest season. Spring and summer see far less demand — and utility rebate budgets are often still full that early in the year.
How much insulation is worth paying for?
R-value, air-sealing and material decide both the price and the payback. Our editors on the trade-offs.
The air-sealing case
Insulation without air-sealing underperforms. Sealing leaks first is cheap and often delivers more comfort per dollar than thicker insulation alone — make sure it's in the scope.
The R-value case
Insulate to the DOE recommendation for your climate zone — under-insulating to save money leaves comfort and energy savings on the table that would have paid the job back.
The rebate case
Insulation has some of the best rebate math in home improvement — utility and state programs can cover a solid share (the federal 25C credits ended Dec 2025). Check DSIRE before you book and time it to a fresh rebate budget.
Hit the DOE R-value for your zone, air-seal first, and stack the rebates. Insulation is one of the few upgrades where doing it fully is also the cheapest path to payback.
Derry Village vs Dover
Is spray foam insulation cheaper in Derry Village or Dover?
There's no meaningful difference: spray foam insulation runs about $4,150 in both places.
Why does spray foam insulation cost more in Dover than Derry Village?
The main driver is local labor rates: Dover's labor index is 1.04 versus 1.04 in Derry Village. Climate zone (cold vs cold) also shift the total.
How much is spray foam insulation in Derry Village, NH?
Expect to pay $1,650 to $6,650 for spray foam insulation in Derry Village in 2026, averaging around $4,150.
When is the cheapest time to buy spray foam insulation — and does it differ by city?
The best window is the same in both Derry Village and Dover: Spring and summer, when demand drops and installers discount to keep crews busy — typically 5–10% off peak pricing. The most expensive time anywhere is an emergency replacement during the pre-winter fall rush.
Should I choose where to live based on spray foam insulation cost?
No — the cost is essentially identical between Derry Village and Dover. Base the decision on the things that actually vary: contractor reputation, scope, equipment tier and timing.
Compare spray foam insulation in other cities
Updated June 2026 · By Serhat Özçelik