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M.D. Sullivan's website describes the company as a custom builder specializing in bath and kitchen remodels, additions, replacement windows, porches and decks, finish work and siding. A 2019 customer said Mark built their deck, handling everything from coordinating permits to the final finishing touches. That 2019 reviewer wrote that his quote was spot on, that he always arrived when he said he would, and that he left the job site tidy at the end of the day. A 2021 customer said Mark had done numerous projects on their house, from general repairs to building a new back deck, each in a timely manner and on budget. That 2021 reviewer added that he stayed in constant communication about each project. A 2019 customer described water-damaged cedar shakes on an unusual house; they went with long boards and made some changes, and said the job was done timely and on budget. A 2018 customer who described themselves as a former contractor praised the materials and design of their deck and said the project was completed on schedule and within budget.
“DA Sullivan will close Newton Place to through traffic for work related to the library project.”
Mark has done numerous projects on my house from general repairs to building a new back deck. Each job was done in a timely manner and on budget. He's in constant communication about the project so as theirs no surprises. Mark's knowledge and experience is bar none.
We had Mark build our deck this year and he did an outstanding job. From coordinating permits to the final finishing touches, he delivered a quality job. His quote was spot on, his communication was excellent, and his use of materials was very efficient. He always arrived when he said he would and left the job site tidy at the end of the day. I would hire him again in the future and recommend him highly.
We had a mess with water damaged cedar shakes and a very unique house. We went with long boards and made some changes and Mark did a great job and made our house look fabulous. It was done timely and on budget. Every detail was discussed. U would highly recommend.
As a former contractor I can appreciate a quality product, the materials and design of my deck were excellent. Business was performed in a professional and courteous manner with minimal disruption to daily life. The project was completed on schedule and within budget. Thank you M.D.Sullivan!
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2 changes recorded — last scanned Sep 22, 2026.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from M.D. Sullivan. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$23,000 – $35,000
Typical remodeling project around $29,000
Historic structural work3.2
