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A Spotless Sweep Chimney Service is run by Mark Valys, who Thumbtack says has spent 31 years cleaning and repairing chimneys and fireplaces out of Winthrop. A 2025 Google reviewer who'd compared several other sweeps called him "a true craftsman." The written record runs mostly from 2017 to 2021 on Thumbtack, with one more account added in 2025. Reviewers describe him arriving on time, walking them through the chimney's condition before starting, and cleaning up the fireplace when the job was done. In a 2020 review, a homeowner said he tracked down and fixed a lingering smell and also resolved issues a previous installer had left behind; in a 2018 review, another described repairing winter chimney damage on a flexible schedule. Thumbtack lists him with a masonry certification from the Wentworth Institute of Technology and a certification in chimney cleaning and repair from the Chimney Sweep Institute of America. The platform also shows 4.9 stars across 60 ratings, with 98% at five stars. He's a solid call for routine chimney cleaning, inspection, or repair from someone who explains what he finds before doing the work; it's worth confirming current pricing and scheduling up front.
I have been looking for a new Chimney Sweep having moved to the Newburyport area. I spoke to countless nearby options and found them all overpriced so I was delighted to stumble across Mark. He’s been in the game for at least 30 years, he’s a true craftsman, and his prices are incredibly fair. To install a new cap, fix a broken flue and redo the flashing was half the price of some of the competition. I couldn’t recommend him more highly.
Mark arrived with another technician during the intended window of time. He answered any questions I had, suggested potential future repairs that might be needed, and informed me of the current condition and material of the interior of my chimney. He cleaned up thoroughly after the work, and I was very pleased with the overall transaction.
Mark has cleaned and inspected our fireplace and chimney and ensured everything is in good working condition for the cold weather. Im very grateful for his transparency, work ethic and all of the explanations for the work done. I had someone else over that found 4k$ worth of repairs in the chimney that were actually not needed so Mark helped me save money and feel safe to use the fireplace. I will not use anyone else to service and maintain the fireplace. Thank you for your great work!
Great service and an extremely quick turnaround time. Had a terrible smell coming from my chimney and not only did they clean it very well but also fixed some other issues that they found from the previous installers and fixed that. Would highly recommend this company and don't try and send to multiple people. Marks your guy!
Mark did a great job repairing our chimney that was damaged over the winter. He was very flexible with my schedule and did great work. I would highly reccommend.
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1 change recorded — last scanned Sep 6, 2026.
Failing furnace flue system replaced5.0
Roof survived a major storm intact5.0
Roofing and siding5.0
Roof done in two days4.3
High-value repeat customer4.4