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King Foundation Sealing is a Belmont, New Hampshire foundation-protection contractor founded in 2014 by Matt King. The company’s own site describes residential and commercial foundation sealing, waterproofing, and foam-board insulation, with transferable product warranties and service across New Hampshire. The available review record is small: one customer praised Matt’s professionalism, promptness, quality, and fair price, while another reported unsafe driving by a company van. The business has clear official service information but limited independent review depth. Before booking, confirm the exact waterproofing system, warranty terms, project scope, pricing, and who will perform the work. Ask about the reported vehicle-safety concern and verify current contact details and scheduling.
Matt did an amazing job! He was professional, prompt, and the quality of work was excellent—all at a fair price. Highly recommend!
Whoever is driving the vans to this company needs to have their license revoked ASAP. All over the road, swerving everywhere, driving in the dirt, etc. Probably texting. Get off your phone and pay attention. You’re going to kill someone!!
I called King foundation on short notice, Matt is the owner of this company, very nice guy along with the crew that came out, he had is crew out in 3 days to waterproof and foam board my foundation in the front and a small side addition, that wrapped around to the back of the house, King Foundation will be back to waterproof and foam board the back of the house in a few weeks when the back of the house is ready for them, thumbs up to king foundation. A+ all the way.
We use Matt and his crew for all our foundation sealing and foaming needs. We recommend them to everyone we do work with. Matt is very responsive to every call and text. His crews are very polite and professional, which says a lot in our industry, most crews are a little rough around the edges, but not Matt and his crew. We take great pride in the work we do and never recommend anyone we aren't 100% confident will take care of our customers and it's great know we never have to worry about that with Matt and his crew, there the best.
I want to be upfront that I did not use them for service and based on my experience with one of their trucks this morning I would never think of it. One of their trucks pulled right out in front of me while I was going 55MPH at the Dunkin Donuts in Loudon off of 106. This caused me to slam on my brakes and swerve to avoid a crash. Luckily I was paying attention. Clearly, they were not or they did see me and decided to pull out anyway like asshoIes. I had my son with me who I was taking to school. Lucky for us there was no crash and I used it as a teaching moment on how important it is to always pay attention. I can only assume they work like they drive so you would be better off using someone else. Also if you use them they might kill someone on the way to the job. Something to consider.
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1 change recorded — last scanned Sep 8, 2026.