The whole-house project
Metal roof replacement in New Hampshire
Most standing seam projects in New Hampshire start as an asphalt roof on its second or third round of trouble. Replacing it with metal is a different project than another shingle job, with its own sequence, decisions, and honest tradeoffs. Granite State Metal Roofing matches homeowners statewide with independent local professionals who do this conversion; here is what the project actually looks like.
Tear-off or overlay: the first real decision
Tear-off is the default for a reason. Stripping the old shingles exposes the deck, so rot, delaminated sheathing, and past leak damage get fixed instead of buried, and the new ice and water barrier plus synthetic underlayment start on clean wood. It costs more and adds disposal, and it is the version most manufacturers assume in their warranty terms.
An overlay, installing panels over one existing asphalt layer on furring strips or a slip sheet, is legitimate in narrower conditions: a verifiably sound deck, a single flat shingle layer, a panel manufacturer that permits it, and a building department that signs off. It saves tear-off and disposal money and buries whatever the old roof was hiding. A bidder who recommends an overlay without probing the deck is answering the price question, not the roof question.
How the project runs
- Measurement and a written, itemized estimate naming the panel system, gauge, finish, and a per-sheet decking price.
- Contract signing. On jobs over $5,000, New Hampshire's RSA 359-G notice belongs in it.
- Panel fabrication lead time; many installers roll-form panels to length for your roof.
- Tear-off (or overlay prep), deck repairs, ice and water barrier at eaves and valleys, underlayment.
- Panel installation, flashing, ridge venting, and trim; snow retention goes on last.
- Final walkthrough, warranty registration, and paid-invoice paperwork you keep with the house.
What the conversion costs
Standing seam installs at roughly $10 to $18 per square foot, and whole-house New Hampshire projects commonly land between $20,000 and $34,000, about twice an architectural asphalt replacement. Tear-off, deck repair, pitch, and trim complexity move the number; so does the panel system itself. The line-by-line version with a worked example is the NH metal roof cost guide, and the system choices behind the quote are explained under standing seam metal roofing.
One flag worth repeating: no tax credit or rebate applies to a New Hampshire metal roof. The federal 25C credit expired at the end of 2025, and NHSaves has no roofing rebate. A pitch that leans on either is out of date at best.
Replace or repair?
Not every failing roof needs the full conversion. An asphalt roof losing granules everywhere is done, but an existing metal roof with a leak, a flashing gap, or fastener back-out usually wants a repair visit first; see metal roof repair. The decision framework, snow loads, and vetting checklist all live in the New Hampshire Metal Roofing Guide.
Where we match replacement projects
Statewide, with the deepest demand in the shingle-heavy suburbs: Manchester and Nashua, Salem and Derry, and the Concord area, where thousands of 1980s and 1990s asphalt roofs are aging out at the same time.