Flat Roof Replacement cost: Derry Village vs Dover (2026)
Derry Village and Dover are a near-perfect match on flat roof replacement cost in 2026, both landing around $11,100.
Derry Village NH
Typically around $11,100
Dover NH
Typically around $11,100
Derry Village vs Dover: full breakdown
| Factor | Derry Village | Dover |
|---|---|---|
| Typical 2026 cost | $11,100 | $11,100 |
| Estimated range | $5,700–$16,500 | $5,700–$16,500 |
| Labor index (vs US) | ×1.05 | ×1.05 |
| Climate zone | Cold | Cold |
| Climate factor | ×1.03 | ×1.03 |
| Local permit | $300 | $300 |
| Labor share | $6,650 | $6,650 |
| Materials/equipment | $4,450 | $4,450 |
These are 2026 planning figures for flat roof replacement, localized to each city — not formal quotes.
A wash — choose on quality, not city
With no real price gap on flat roof replacement, the choice comes down to contractor quality and timing, not which city you're in.
Flat roof replacement by type: Derry Village vs Dover
Every flat roof replacement type gets its own localized price for each metro, using the same labor, climate and permit adjustments — a true apples-to-apples comparison.
| Type | Derry Village | Dover |
|---|---|---|
| EPDM (rubber) | $5,700–$13,250 | $5,700–$13,250 |
| TPO | $6,800–$14,350 | $6,800–$14,350 |
| PVC | $7,850–$16,500 | $7,850–$16,500 |
| Modified bitumen | $5,700–$12,150 | $5,700–$12,150 |
| Built-up roofing (BUR) | $7,300–$15,400 | $7,300–$15,400 |
These are 2026 planning figures for flat roof replacement, localized to each city — not formal quotes.
Flat roof replacement by roof size: Derry Village vs Dover
Flat and low-slope roofs are priced per square (100 sq ft) and run about $3–$11 per sq ft installed, depending on the membrane. The roof area is close to the footprint since there's little pitch.
| Size | Derry Village | Dover |
|---|---|---|
| 1,000 sq ft (10 squares) | $4,600–$9,500 | $4,600–$9,500 |
| 1,500 sq ft (15 squares) | $5,700–$12,150 | $5,700–$12,150 |
| 2,000 sq ft (20 squares) | $6,800–$15,400 | $6,800–$15,400 |
| 2,500 sq ft (25 squares) | $8,400–$17,550 | $8,400–$17,550 |
| 3,000+ sq ft (30 squares) | $10,000–$20,800 | $10,000–$20,800 |
Flat roof replacement numbers here are 2026 planning ranges, adjusted per city — useful for budgeting, not a substitute for an actual quote.
Cheapest time for flat roof replacement in either city
The material dictates the season (shingles need warmth to seal), but the price is set by demand, and demand spikes after every regional hailstorm. Booking your spot in the quiet winter months for spring work avoids that spike.
Where does a smart roofing budget go in 2026?
Tear-off vs. overlay, shingle tier and what's hidden under the deck decide the real number. Our editors on the trade-offs.
The value case
Architectural shingles hit the sweet spot — far more durable than 3-tab for a modest premium, and far cheaper than metal or tile. For most homes they're the right default.
The do-it-right case
Pay for a full tear-off and quality underlayment, flashing and ventilation. An overlay saves money today but traps heat, voids some warranties and costs more at the next replacement.
The risk case
Budget for the unknown: rotten decking found at tear-off is the most common surprise. Get the per-sheet repair rate in writing up front so a "cheap" bid doesn't balloon mid-job.
Full tear-off, architectural shingles and a written deck-repair rate protect you from the two big risks — hidden rot and warranty gaps. The lowest storm-season bid is rarely the cheapest over the roof's life.
Derry Village vs Dover
Is flat roof replacement cheaper in Derry Village or Dover?
flat roof replacement costs about the same in both — roughly $11,100 in each city.
Why does flat roof replacement cost more in Dover than Derry Village?
Dover's higher labor index (1.05 vs 1.05 in Derry Village) is the biggest factor, with the cold/cold climate split playing a smaller role.
How much is flat roof replacement in Derry Village, NH?
Expect to pay $5,700 to $16,500 for flat roof replacement in Derry Village in 2026, averaging around $11,100.
When is the cheapest time to buy flat roof replacement — and does it differ by city?
Timing doesn't change by city here — Late spring to early fall (dry, 45–85°F) is the cheapest window in both Derry Village and Dover, saving roughly 5–10%. Avoid mid-winter and the post-storm rush in either location, when emergency replacements push prices up.
Should I choose where to live based on flat roof replacement 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 flat roof replacement in other cities
Updated June 2026 · By Serhat Özçelik