Work was done efficiently quick. Workplace was clean after job.
— Robert P., West Lebanon, NH
Merrimack County, NH
Merrimack County spans two different roofs: the settled capital-region neighborhoods around Concord and Bow, and the higher, snowier Kearsarge towns west of them. Both get the same answer. Interlock is aluminum, installed once by a certified crew, and covered by a lifetime limited warranty for the original owner — no replacement cycle to plan around.
★ 4.7 average from 231 verified New Hampshire reviews
New Hampshire line: (603) 803-4998 · Toll-free 1-866-733-5811
The capital's established neighborhoods were roofed in slate when they were built, and the profile is what makes them read the way they do. Interlock's aluminum slate profile holds that appearance at 0.41 psf installed, against roughly 8 to 10 psf for the natural material — so the roofline survives without reinforcing the frame under it.
New London, Wilmot, Warner and Henniker sit high enough to see far more snow and far more melt-and-refreeze than the river towns do. Interlock sheds snow rather than holding a saturated mat against the deck, and meltwater finds no exposed seam to get under. (Dam formation itself is an attic insulation and ventilation issue, which we check at every estimate.)
People stay in these towns. If you plan to be in the house for decades, the question is not what a roof costs — it is how many roofs you intend to buy. The Guardian Warranty from Interlock Roofing is a lifetime limited warranty, transferable, so the answer can be one.
Not steel with a coating over it. It does not rust.
Gallery
Real homes, real installations — photographed after completion.

Webster, NH
Charcoal Grey

Webster, NH
Charcoal Grey

Webster, NH
Charcoal Grey

Webster, NH
Charcoal Grey

Webster, NH
Charcoal Grey

Concord, NH
Black

Concord, NH
Black

Concord, NH
Black
Reviews
Work was done efficiently quick. Workplace was clean after job.
— Robert P., West Lebanon, NH
Great work. He is the best
— Peter La M., Derry, NH
This has been one of our best investments ever. It wasn’t perfect when they finished but the after installation follow up has been. Navir always has been very professional, friendly and polite. I always have tried to tip him, he never accepts it but is grateful for the offer. I highly recommend this company.
— Jon T., Center Harbor, NH
They gave us a prompt response when our roof was damaged by a tree branch. Looks as good as new !
— John B., Chester, NH
Nazar was wonderful! I can’t thank him enough!
— Jeffrey Y., Hampton, NH
Naz, worked for hours non stop doing the repairs , He had a lot of stamina and knowledge on how to remedy any damage . Afterwards he showed me the finish product , I was and still am amazed as to the quality of his works
— Andy B., Barrington, NH
Bow, Concord, Henniker, Hooksett, New London, Pittsfield, Warner, Webster, Wilmot, Boscawen, Canterbury, Dunbarton, Loudon, Salisbury, Sutton, Northfield
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