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Typical Greater Boston range for this kind of work, from regional averages — not a quote from Castle slate roofing co.. Use it to sanity-check bids, then get the real number in writing.
A square is 100 sq ft of roof surface — bigger than the floor plan because of pitch and overhangs.
Estimated range
$9,000 – $18,600
Typical roofing project around $13,800
Castle Slate Roofing's customers tend to stay. One Lincoln homeowner wrote in December 2025 that they had worked with Kevin Williams for 20 years — it began with a few broken slates soon after they bought the house and grew into his crew being there through a major renovation and a two-story addition. Another, writing in November 2022, said he had handled big and small repairs and copper work in difficult spots on their 1929 Tudor's original slate for over thirty years. A 2024 review came from a Somerville church whose 100-year-old slate roof he had maintained for 11 years. BBB lists the company as a Somerville sole proprietorship run by Kevin Williams Sr., 49 years in business, and grades the profile A+. Its website describes slate roof repair and restoration, custom copper roofing, gutters and ice dam removal, with a stated service area of Newton, Somerville, Boston, Needham, Winchester, Brookline and Wellesley. On Google it averages 4.9 across 17 ratings. Two accounts are worth having in mind. In an August 2025 review, a homeowner with a leak wrote that another slate company quoted three times Kevin's price and described problems all over the roof, when it was just the chimney. A February 2026 review came from a Cambridge condo association in a converted church, whose 1938 roof he took on in 2021 after their previous company dropped them as too small a job. Price and paperwork come up in about half the reviews: very reasonable prices on that church roof, fair pricing on 24 slates replaced after a single email, clear invoicing and clean cleanup, two roof vents installed at a reasonable price and on schedule. The jobs described run from replacing one missing slate, in a 2022 review, to a full slate roof with new copper gutters on a Tudor home — a December 2025 review put that work at more than 20 years ago and said the company has maintained it ever since — plus gutter cleaning, leaf removals, and, in a January 2023 review, a small entry porch roof replaced to stand up better to ice and snow. If you own a slate or copper roof around Boston and want someone who works in that material week in and week out, this is a fit. Get the diagnosis and the price in writing before any repair, and confirm current registration and insurance for the scope you are hiring.
Kevin and his team at Castle Slate Roofing took over management of the slate roof on our converted church condo association building in Cambridge in 2021. He took over after our previous company said we were too small of a job for them and dropped us. Our roof is from 1938 and requires yearly maintenance to replace and repair missing and broken slates. They have identified and repaired flashing issues both on the edge of the roof and around the many skylights put in during the building’s conversion. It’s nice to work with a local small business that is responsive and dependable and willing to work with the quirks of a Cambridge neighborhood. I highly recommend them for your slate roof needs!
Kevin and his team reliably and expertly take care of all our roofing needs, including replacements, repairs, leaf removals...whatever is needed, and do so in a prompt, professional, and friendly way.
Castle replaced the slate roof and installed new copper gutters on our Tudor-style home more than 20 years ago and has maintained it ever since. The did a great job with the roof and gutters and have reliably cleaned our gutters, inspected the roof and performed repairs as needed twice a year. I recommend them highly.
We've been working with Kevin and his team for the past 20 years. What started as a great experience replacing a few broken slates soon after we bought our Lincoln home led us to hire Castle Slate during a major home renovation and two story addition several years later: extensive roofing slate and copper work, chimney repointing, new copper gutters and drain pipes, and integrated ice belt along the entire north-facing roof. His work is flawless. We now have Kevin come by to keep up with periodic roof inspection and maintenance and annual gutter cleaning. We are always happy with his skilled work and attention to detail. He is a tremendous resource and we're very fortunate to work with him.
Spoke to Kevin Williams as our roof was leaking. We got an estimate also from another slate roofing company that quoted 3 times the quote we received from Kevin. The other roof said there were all the issues with the roof and never mentioned it was just the chimney that was leaking. Kevin had repointed the chimney and replaced several slates. There has been "no" leaks. He is an honest businessman and I would recommend him to everyone. Thank you Kevin and team!
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1 change recorded — last scanned Jul 2, 2026.
Slate & copper specialist4.5
20 permitted projects since 20153.7
Talked out of unneeded replacements4.5