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Verified record
Isg Building Services is a Waltham general carpentry and remodeling outfit run by Iwal Guerrero, who reviewers consistently call by name. The work people hire him for spans bathroom and kitchen remodels, general carpentry and cabinetry, and even furniture repair — a small operation that keeps its hands on the whole job rather than farming pieces out. Bathroom remodels are where the record runs deepest. In a 2023 review, a homeowner described gutting and redesigning an entire shower after a leak into the basement, with plumbing upgraded and mold removed along the way — the same reviewer called the pricing fair. Another 2023 review told a similar story: a full bathroom renovation finished quickly and inside budget, with the homeowner praising Iwal's guidance on materials and fixtures. A 2025 kitchen client separately praised the quality of the finished work and said Iwal stayed open to their own ideas while still offering thoughtful recommendations. One 2025 review stands out for something beyond the craftsmanship: a client living 2,500 miles away had Iwal take over getting permits, coordinating with an insurance adjuster and a civil engineer, and having his crew work a weekend so a business could reopen on schedule. A smaller 2025 review on a furniture repair job was similarly satisfied, if brief. Every review on file is five stars, and Thumbtack shows Isg with 63 projects posted — but the written record itself is short: just five reviews dated between 2023 and 2025. That's not a red flag on its own, but it's worth asking for a couple of recent references directly, especially for a job the scale of a full remodel. This is a solid call for a homeowner planning a bathroom or kitchen remodel who wants someone who'll deal with the paperwork as readily as the tools — just don't skip asking around before signing.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from Isg Building Services Inc. Use it to sanity-check bids, then get the real number in writing.
A typical single-level deck is 12×16 — about 200 sq ft.
Estimated range
$7,750 – $14,500
Typical carpentry project around $11,100
Very happy with the furniture repair.
I had a great experience working with ISG Building Services on my kitchen project. Their quality of work is excellent, and they brought thoughtful recommendations while still being open to my vision. They are clearly experienced and detail-oriented, which gave me a lot of confidence throughout the process. I would definitely recommend ISG to anyone looking for reliable and skilled construction services.
What a pleasure it was working with Iwal. I explained to him that I was 2500 miles away from the store location and let him know the situation. He took over from that point getting permits and working with an insurance adjuster and a civil engineer. I am extremely pleased with the work he did. His crew even worked the weekend to make sure our business was open on Monday morning. I will be hiring Iwal for everything that needs to be done in my location. Great price, excellent work. What else can you want.
We are very happy with how our bathroom renovation turned out! Our shower was leaking into our basement and we had to gut and redesign the whole thing. Iwal is trustworthy, provided fair pricing and was very knowledgeable. He was thoughtful about upgrading our old plumbing and removing mold as part of the process. He also went above and beyond to help us install a new window and utility sink. The project took about 1 month. For the future we would like to make sure there is enough communication to be on the same page when challenges come up, but overall we are super happy with our new luxurious bathroom. Thank you, Iwal and team!
I hired ISG Building Services to renovate my bathroom. Iwal did an exceptional work on our bathroom renovation. Work was done quickly and efficiently inside our budget. He was responsive and knowledgeable when guiding material and fixture selection. I highly recommend ISG Building Services.
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1 change recorded — last scanned Sep 5, 2026.
Takes on repairs others declined5.0
Shed craftsmanship5.0
Works with crooked houses5.0
Rescues stalled projects5.0