Accreditation status — BBB lists the business as non-accredited
Scope confirmation — verify materials, warranty, and service area
Sentinel Insulation is a veteran-owned New Hampshire insulation company serving Newton, Hampstead, Portsmouth, and surrounding New England areas. Its site lists spray foam, fiberglass, cellulose blown-in, Rockwool, and insulation removal, while BBB lists the Nashua business with an A- grade and a November 2025 start date.
Five recent Google reviews are uniformly positive, describing knowledgeable and communicative staff, prompt quotes, fair pricing, punctual attic blown-in work, and successful insulation projects. One reviewer specifically compared Sentinel favorably with three prior spray-foam companies.
Before booking, confirm the exact insulation system, material, quote, warranty, service area, and current licensing. BBB shows the business as non-accredited and the available NH HIC lookup did not find a license result, so those details should be checked directly.
Sentinel appears suited to homeowners seeking spray foam or other insulation work in southern New Hampshire and nearby areas who value clear communication and prompt scheduling.
Read the comments
Most recent comments
5.0Aug 29, 2026
This is the third spray foam insulation company that I have worked with in as many years and they are the most knowledgeable, accommodating (I'm an engineer), and communicative of the lot. I am very happy with the results and highly recommend them to anyone in need of an insulation company.
Excellent work. Highly recommend! Very prompt in giving me a quote and the job was completed the next week. Fair pricing and outstanding team that did a great job!
My family just had our attic blown in by Sentinel and we were so pleased by the work these guys did. We went with Sentinel based on the reviews and were happy we did. They were punctual, and knowledgeable, like many have stated. You could tell they care a lot about the work they do. Thank you to the entire team!
Excellent business all around! Highly recommended. Prompt in responding to inquiries; knowledgeable regarding insulation products; fair pricing and outstanding team who did the service.
