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Pedro A.
Abacus Builders, led by Mark. Their team is highly experienced and organized, delivering incredible results swiftly. The project management was top-notch, ensuring everything ran smoothly from start to finish. recommend Abacus Builders for any construction needs. They truly stand out in their field!"
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John M.
I can’t say enough good things about Abacus Builders. They are the most reliable, go to builder and developer in South Boston and Greater Boston. They show up, do the work, and do it right. I have worked with them on multiple projects, and every experience has been smooth, professional, and exactly what you expect from a top-tier contractor. Every client I have referred to Abacus have all said the same thing, they were impressed with the quality, the honesty, and the way Abacus goes above and beyond from start to finish. Communication is sharp, timelines are hit, and the craftsmanship is first class. If you want a contractor you don’t have to worry about, Abacus is the one.
Review from Google
michael a.
Mark and Ger and the whole crew at Abacus are the best. I had a leak in the roof and many of my neighbors had told me they were spending $50k-$100k on work to repair a leak, which invariably included all sorts of extra work. Mark came over unscrewed several Epee boards which they built 5 years earlier. The rubber roof had an opening. Mark sent Gareth his trust roofer and partner over and fixed it for $400. Then a plasterer he knew came over and fixed my ceiling for another $400. You cannot make this stuff up!!! Abacus are the only construction firm we will call or recommend for the duration.
Review from Google
Guthrie A.
I hired Abacus Builders to redo the entire exterior of my house—roof, siding, and trim. They were not the cheapest, and they also weren't the most expensive. After seeing how much work they did, the price now feels extremely reasonable. Abacus was easy to work with and easy to communicate with. They answered my questions, and listened to my requests. The subcontractors that they hired were very skillful and friendly. Overall I'm extremely happy with the results, and I plan to hire them for other projects in the future.
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Mike C.
Abacus performed a series exterior carpentry and gutter repair jobs for me. This included replacing sections of posts, beams, siding, trim, and downspouts. It also included work on related mortar and moisture barriers. Throughout the estimation, demo, and construction phases I found that everyone I dealt with was very communicative, flexible, transparent, and constructive. The work was high quality and the crew worked quickly. I plan to work with them again on future projects.
Review from Google
Jennifer M.
Abacus rebuilt our roof deck after the old one had to be torn down to replace the roof. What I liked best was their no nonsense professionalism. I had spoken with a number of other contractors who hedged on this, hedged on that, wouldn't give straight answers. One even came back a week later with an oopsie, we forgot to add x, y, z into the quote and it'll be 8k more. Abacus, came, looked, said this is how to do it, explained everything, found the old permit, got the new one, arrived when expected and communicated throughout. Price was fair, though there were increases from the original quote it was due to a long delay on my end and the arrival of the Eejit Tariff King. There were one or two snafus but that is to be expected with big projects, and they were always remedied right away. e.g. the IS slapped a stop work no permit warning on our door - well there was a permit had the inspector bothered to check -; regardless, the owner Mark answered my email immediately (on a Sunday night no less) and it was taken care of on Monday. Finally, the work product is excellent and I expect we'll enjoy many lovely days and nights up on the deck. I'd hire Abacus again without qualm. (Gerald the project manager is terrific- ask for him!)
Review from Google
May 16, 2026