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ST3 Masonry is a Quincy stone and concrete business whose customers name Shawn. In a September 2025 Google review, a customer said he made a trip up from Boston to build a dry stack retaining wall at their grandmother's house on Sawyer Lake in NH and was finished in a few hours. A January 2023 customer said Shawn put together a quote and repaired a stone wall in front of their property after a truck struck it, and a September 2022 reviewer had a retaining wall and a patio built. An April 2023 Angi customer said their neighbors were impressed enough to hire him for the same project. An August 2024 Angi review is a complaint about a pool deck: the customer said the concrete pour was not leveled, so water stands after rain, that he did not clean up, that the finish work took 3 weeks and several calls and texts, and that walkway concrete cracked by his heavy machinery was never fixed as promised. Google shows 5★ from 3 ratings; Angi and HomeAdvisor each show 4.3★ from 4 ratings and list stone wall repair, pavers and concrete work.
Did a dry stack retaining wall in the water of my elderly grandmother’s house on sawyer lake gillmington nh worked fast and made a trip up from Boston wall came out perfect and he was finished in a few hours
Shawn is definitely a hard worker, however, he does not have reliable staff. I had pool deck concrete replaced. My pool deck is worst I.e standing water noted after rain because concrete pour was not leveled, overall, poor work quality. He did not clean up after himself. The finish work took 3 weeks to complete after I had to call and text multiple times. The concrete on my walkway to the pool is cracked up from his heavy machinery which he promised to fix but not. I am very disappointed in the work.
They are great, they always keep me in the loop, l have some updates on the project all the time.
We couldnâ t have been more pleased with the result of our project. Shawn was professional and the same with his team. They are hardworking and have made sure that the job was done to the point where it exceeded our expectations! Our neighbors were so impressed with our project that they hired him to do the same thing for them.
Shawn repaired a stone wall in front of my property that was damaged when struck by a truck. Shawn was very helpful in putting together a quote for repair and performing the repair. He did a great job. I would highly recommend him.
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2 changes recorded — last scanned Sep 17, 2026.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from ST3 masonry. Use it to sanity-check bids, then get the real number in writing.
A 12 × 20 patio is 240 sq ft; a 4-ft walkway is 4 sq ft for every foot of length.
Estimated range
$4,500 – $9,000
Typical masonry project around $6,750
Step and staircase rebuilds5.0
Basement waterproofing5.0
Retaining walls5.0
Renovates century-old structures5.0
Wood and block retaining walls4.9