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Verified record
No state license for this trade. New Hampshire doesn't license or register roofingbusinesses, so there's no state registry to check. That's true of every roofing business in the state, not a mark against this one. Insurance is self-reported.
Highlights
- Roof leak repair — a 2020 review says there were no more leaks
- Copper work — a 2025 review called John the best coppersmith
GDC Slate & Copper Roofing's website invites visitors to a gallery of slate roofs and the historical tools that make them possible, and the business states it has been in business for 95 years. It holds 5 stars on Google from 3 ratings. A 2020 Google review says John Greene immediately came and installed an over payment on one half of a leaky barn roof: "No more leaks." That 2020 review also says Mr. Greene immediately came and replaced the dried out seal around a leaking stand pipe, fixed the leak and did not charge for it. A 2025 Google review said John "has always come through for us, even with last second, late night requests" and called him the best coppersmith in the area.
Read the comments
Most recent comments
- 5.0Sep 1, 2025
Best Copper Metal worker in the Area. John has always come through for us, even with last second, late night requests. Best in the area, the best coppersmith.
— Queen City Roofing LLCView on Google Reviews ↗ - 5.0Aug 8, 2020
I needed a leaky roof on my barn repaired and contacted John Greene at GDC and he immediately came and installed an over payment on one half of the roof. No more leaks. While he was here he even took out a chain saw and removed a dead tree for me!😀 On another occasion I had water leaking around a stand pipe. Again, Mr. Greene immediately came and replaced the dried out seal around the pipe and fixed the leak.He didn't even charge me for that! 100% satisfied!!!
— David WoodwardView on Google Reviews ↗
What does a roof replacement cost in Greater Nashua?
Typical your area range for this kind of work, from regional averages — not a quote from GDC Slate & Copper Roofing. Use it to sanity-check bids, then get the real number in writing.
A square is 100 sq ft of roof surface — bigger than the floor plan because of pitch and overhangs.
Estimated range
$9,000 – $18,600
Typical roofing project around $13,800
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