Local business · Winthrop, MALocal business · 23 Seaview Ave, Winthrop, MA
Verified record
One hundred and twenty-one permits, and almost none of them are the kind of job a directory lead form is built for. George F Sennott works out of 23 Seaview Ave in Winthrop, and the permitted work under that name is building-envelope restoration: EPDM and slate roof replacement, roof decks, waterproofing at planters and courtyards, sealant and masonry repair, and rebuilds after fire damage. The addresses carry the same theme — Boston, South Boston, East Boston, Charlestown, Brookline, Weston and Everett, between 2018 and 2023, with several of those jobs valued from six figures up to $1.3 million. This is water-and-roof work at building scale. What's missing is anyone's account of how it went. Its BuildZoom page carries no customer reviews at all; the 93 printed there is the directory's own score, not a homeowner star average. Licensing deserves a direct question. BuildZoom lists Massachusetts construction supervisor licence CS-077808 as active and says it checked that in July 2026 — the directory's claim, not something confirmed against the state registry. It also shows an earlier construction supervisor number, CS-070464, and two Massachusetts home improvement contractor registrations, #175302 and #182570, as inactive and at one point cancelled. Home improvement registration is what covers non-structural residential work, so ask which registration covers your job today and check it with the Department of Public Safety and the Office of Consumer Affairs before signing. For a roof assembly, a deck membrane, or water coming through a terrace or foundation wall on a multi-unit building, the permit history behind this name is specific and repeated. Worth asking whether they take smaller residential jobs, since the permits shown are large-building work — and asking for references, which are the only account of the work available.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from George F Sennott. Use it to sanity-check bids, then get the real number in writing.
Not sure which you need? Start with an inspection — many reputable companies assess free, and independent assessments run up to $500.
The wall run getting the drain — a full 30×40 ft basement is about 140 ft.
Estimated range
$7,600 – $15,000
Typical waterproofing project around $11,300
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No changes recorded yet — last scanned Aug 3, 2026.
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