Castle slate roofing co.
Local business · 23 Victoria St, Somerville, MA 02144, USA
Their work
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Verified record
- A+ BBB rating
- 1 review in the last 6 monthsNo negatives
- 2 customer photosOf completed work
Highlights
- Niche slate expertise — recently took on a 1938 church roof another contractor declined
- Long client relationships — reviewers describe decades of repeat roof and gutter work
- Strong cross-platform ratings — 4.9 stars on Google, A+ with the BBB
- Praised as fair and trustworthy — echoed across several independent write-ups
- No BBB accreditation — carries an A+ grade but isn't a formally accredited business
Slate roofs don't come up much until something's leaking, and in the Newton-Somerville area, Castle Slate Roofing is the name reviewers keep pointing to. The BBB lists the business as a 49-year-old sole proprietorship run by Kevin Williams Sr., and the company says it covers Newton, Somerville, Boston, Needham, Winchester, Brookline, and Wellesley — doing slate roof repair and restoration, custom copper roofing and gutters, and ice dam removal, specialty work that a lot of general roofers pass on. The reviews match that focus. Google shows a 4.9-star average from 17 ratings, and every account across five different sources — Google, several independent write-ups, and the BBB — points the same direction, with no negative reviews turning up anywhere in a history running back to 2022. Several customers describe repeat roof and gutter work stretching back 20 years or more, the kind of long-running relationship that's hard to fake. The one specifically recent account, from a Cambridge church condo association, describes the crew taking over the building's 1938 slate roof in 2021 after a previous contractor said the job was too small, then finding and fixing flashing problems at the roofline and around skylights added when the building was converted. Worth knowing before calling: the BBB profile carries an A+ letter grade, but Castle Slate Roofing has never become a formally accredited BBB business, and that profile has no logged complaints or review text on file to check. Star ratings also drift a little by source — Google's 4.9 from 17 raters against a secondary directory's 4.8 from 12 — a gap small enough to chalk up to different review pools rather than any real split in how the work is regarded. For an older home with a slate or copper roof — the job a lot of contractors either overprice or turn down — this reads like the specialist built for it. Worth confirming current licensing and getting a written estimate before booking, ordinary diligence for a long-running one-person operation rather than anything specific raised here.
Read the comments
Most recent comments
- 5.0Feb 16, 2026
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!
— Donna LeclercView on Google Reviews ↗ - 5.0Dec 16, 2025
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.
— Stephen GrossbergView on Google Reviews ↗ - 5.0Dec 12, 2025
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.
— Daniel KuritzkesView on Google Reviews ↗ - 5.0Dec 9, 2025
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.
— ChrisView on Google Reviews ↗ - 5.0Aug 20, 2025
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.<br><br>Thank you Kevin and team!
— Phyllis BoydView on Google Reviews ↗
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Update history
Added 16 new comments, added 3 new photos, established rating 4.3
- behind the score: No BBB accreditation — carries an A+ grade but isn't a formally accredited business