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ST3 Masonry is a masonry contractor based in Quincy, Massachusetts, led by Shawn. Reviews describe the business handling retaining walls, stone wall repairs, patios, and concrete work. Across seven reviews on Google, HomeAdvisor, and Angi from 2022 through 2025, most rate the work five stars. In a 2022 review, a customer described a retaining wall and patio build finished quickly and to a high standard. In a 2023 review, a homeowner reported Shawn repairing a stone wall damaged by a truck strike, calling the quote process and the repair itself a great job. A 2023 Angi review credited the business with keeping customers updated throughout a project, and a 2025 Google review described a dry-stack retaining wall finished in a few hours. A 2024 review told a different story: a pool deck concrete pour that wasn't level, leaving standing water after rain, a walkway that cracked from the contractor's equipment, and a three-week wait for finish work after repeated follow-up calls. That reviewer called Shawn a hard worker but said his crew wasn't always reliable. For stone and retaining wall work, the reviewed track record is strong; homeowners considering a concrete pour should ask about crew staffing, leveling, and site cleanup given that one account.
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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1 change recorded — last scanned Sep 17, 2026.
Step and staircase rebuilds5.0
Basement waterproofing5.0
Retaining walls5.0
Renovates century-old structures5.0