Diamond asphalt services LLC / Diamond Services LLC

Driveways are the whole story here. Almost every write-up on Google and Thumbtack describes the same job — an asphalt drive sealed, patched, or torn up and redone — and a homeowner surprised at how new it looked afterward. Diamond Asphalt Services works out of Winthrop. Its Thumbtack page lists eight employees and six years in business, with owner David Duff cleared through that site's background check. The posted service list runs wider than paving — masonry, demolition, concrete removal, brick and stone repair, land leveling and grading — but paving and seal coating are what customers actually write about. Dave's first name shows up more often than the company's. A 2021 customer described him sealcoating a driveway over the summer, cleaning the edges and the surface before the sealer went down, then calling back months later to check it was still holding. In a 2023 review, a homeowner said the crew redid a driveway another outfit had sealcoated badly and called the price the best on the North Shore. A 2022 reviewer named the two men who showed up, Jim and Mike, and said the driveway looked brand new. An April 2024 review, about a driveway sealed the previous October, called the pricing fair and the team professional and efficient. The catch is age, not tone. Google carries a 5.0 across 20 ratings and Thumbtack a 4.8 across 16, and the sentiment in the written accounts is close to uniform — but the newest of those accounts is from spring 2024, so the praise is consistent rather than current. Thumbtack's own spread also shows one single-star rating among its sixteen. Worth knowing too: the reviews shown on Thumbtack are copies of the Google ones, so the two platforms are less independent than the two totals suggest. For a driveway sealed or repaved north of Boston, this is a small crew with a narrow, repeatedly documented specialty. Ask what they have done in your town in the last year, and get the surface prep — cleaning, edge work, crack repair — written into the quote rather than assumed.