Verified record
S.G. Contracting is a Waltham home-renovation shop run by a contractor reviewers know as Jonathan, Jon, or Johnathan. The company says it's been in business 9 years and lists bathroom remodels, painting, and siding among what it offers. Its five reviews on file, all from 2020 and 2021, average a perfect 5.0 on HomeAdvisor. In a 2021 review, a homeowner wrote that Jonathan was "very professional, reliable and most importantly transparent in communications about timelines" on a home renovation project. In a 2020 review, another customer said "I never had any problems getting in touch with Jonathan," contrasting it with other contractors who fail to call back. The company's profile also references a vinyl siding installation among the work customers described. The written record here is short and dated — five reviews, the newest from August 2021 — so there isn't recent volume to weigh; it's worth asking directly about current availability and any recent work. For a bathroom remodel, a paint job, or siding work in the Waltham area, this looks like a solid call based on what's on file — just confirm the scope and get a firm estimate before booking.
Such an Amazing team! Johnathan was very professional and helpful through the entire process. They completed the job in two days and left my home so spotless. I will hire them for my future projects.
We couldn’t be happier with Johnatan and his work. He is very professional, reliable and most importantly transparent in communications about timelines. He has done an amazing job with both big and small projects and we will definitely hire him again. Highly recommended!
Very Profesional. Jonathan can answer all your questions. Always response all my calls. Very Honest person. Very recommendedâ ¦
Jon and his team were a pleasure to work with on our home renovation project. Jon was great about answering any questions we had along the way and proposing different ideas for how to approach different parts of the renovation. He and his team do top-notch work, so we'd highly recommend them to anyone considering a renovation or construction project.
Did great work. Excellent customer service. I can't believe how often contractors just fail to call you back, but I never had any problems getting in touch with Jonathan. Would strongly recommend.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from S.G. Contracting. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$4,000 – $11,000
Typical exterior project around $7,500
Specializes in
Also offers
Languages
1 change recorded — last scanned Sep 6, 2026.
Renovates century-old structures5.0
Owner on every job4.5
Pool leak two contractors could not find4.5
Basement flood repair completed while owners traveled3.0
Multi-trade condo work4.1
