Verified record
No state license for this trade. New Hampshire doesn't license or register insulation & weatherizationbusinesses, so there's no state registry to check. That's true of every insulation & weatherization business in the state, not a mark against this one. Insurance is self-reported.
- 3 reviews in the last 6 monthsNo negatives
- 3 customer photosOf completed work
Highlights
- Attic air sealing — a recent customer went from R-30 to R-60
- Prompt arrival — a recent customer said the crew showed up promptly
- Blown-in insulation — a 2025 customer said three bare ceilings went quickly
Grade 1 Insulation describes itself on its website as an installer of insulation and air sealing systems, from new construction to renovations and upgrades. It lists a service area that runs from Manchester and Concord to Portsmouth, Kittery, Haverhill and Lowell. A recent Google customer hired the company to air seal an attic and take it from R-30 to R-60, and said the team was fast and professional. Afterward, that customer wrote, the air from the air conditioner was so much colder that it gave the customer's wife goosebumps. A recent customer said the crew was respectful and showed up promptly. A recent reviewer credited Keith and his team and wrote that the company and owner care about the work they install. A 2026 customer said the crew did work on their basement, and that everyone they dealt with was professional and happy to answer questions. A 2025 customer said Keith and his crew blew insulation into three ceilings that had none after a kitchen renovation, arrived on time, and made quick work of it.
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