JT
James Theriault
Theriault Waterproofing Solutions · Basement waterproofing specialist
Trovo Vetted
MA Licensed
Insured
15+
Years experience
350+
Basements waterproofed
5/5
Trovo reference score
About James
James Theriault has spent 15 years solving Boston's most stubborn basement water problems. He founded Theriault Waterproofing Solutions after recognizing that most homeowners were being oversold on solutions they didn't need. James takes a diagnostic-first approach — inspecting thoroughly before recommending anything, and is known for honest assessments that save homeowners money.
He specializes in interior drainage systems, sump pump installation, exterior waterproofing, and foundation crack repair. His work comes with a transferable lifetime warranty.
Specialties
Interior drainage systemsSump pump installation & backupExterior waterproofingFoundation crack injectionFrench drainsWindow well drainage
Trovo vetting
In-person interview with Trovo team
MA HIC License #203891 verified active
Liability and workers' comp insurance confirmed
5 past customer references called — all positive
Ongoing Trovo performance monitoring
Service area
All of Greater Boston, North Shore, South Shore
Typical project range
$5,000 – $30,000
depending on scope and materials
depending on scope and materials
In their words
"I've been waterproofing Boston basements for 22 years. There's nothing your fieldstone foundation can throw at me I haven't seen."
— James Theriault, Founder
How they work
1
Free site visit, written estimate
Detailed scope, line-item pricing, materials list. No verbal "ballparks."
2
Transparent payment schedule
1/3 upfront, 1/3 at rough completion, 1/3 on final walkthrough. No surprises.
3
Daily updates while on site
Photo updates and a same-day response policy on questions.
4
Workmanship warranty
Two-year written warranty on labor. Manufacturer warranty on materials.
From past customers (verified by Trovo)
"Our 1908 fieldstone basement had been leaking for 40 years. James fixed it in two weeks and gave us a transferable lifetime warranty."
— Eleanor S. · Somerville Victorian · 2024
"Honest, fair price, came back to check the work after the first big rain — unprompted."
— Michael R. · Watertown · 2024
"James's crew respected our home. Drop cloths everywhere, vacuumed the dust they made, removed every scrap."
— Kavita N. · Belmont 1930s · 2023
Trovo personally calls 5+ past customers before any contractor joins our roster. These are excerpts from those calls, used with permission.
Recent work
Sample work in their specialty area. Once you're matched, you'll see project-specific photos in your portal.