Basement waterproofing in Hamilton, Ontario
Basement and bathroom waterproofing that actually stops water — membrane systems, drainage and sealing done right the first time.
Overseen by Johnpaul Guminkiriza, founder
PMI Member · B.Sc. Civil Engineering · MBA, Construction Management · 10+ years in project management. About the founder
Water problems don't fix themselves, and they rarely stay small. Jopie Construction Group handles basement and bathroom waterproofing across Hamilton and the surrounding area — proper membrane systems and drainage, not a bucket of sealant sprayed on a symptom.
What's included
Basement waterproofing
Interior and exterior approaches to keep Hamilton basements dry.
Foundation crack repair
Sealing and repairing cracks before they become active leaks.
Window well drainage
Fixing a common source of basement water intrusion in older Hamilton homes.
Bathroom & shower membrane waterproofing
Schluter-Kerdi and equivalent systems under every wet-area tile job.
Sump pump coordination
Making sure drainage has somewhere to go, not just somewhere to collect.
Exterior grading advice
Simple grading fixes that stop water from heading toward your foundation in the first place.
How much does basement waterproofing cost in Hamilton?
Cost depends almost entirely on whether the fix is interior or exterior and how far the water has already travelled. Interior systems are less disruptive and cheaper; exterior excavation is the more thorough fix for a chronic problem. We do not quote until we have found the source of the water.
| Scope | Typical range (CAD) | What moves the price |
|---|---|---|
| Foundation crack injection (per crack) | $600 – $1,500 | Length, access, whether the crack is active |
| Window well drainage repair (each) | $800 – $2,500 | Depth, drain connection |
| Interior weeping tile and sump system | $4,500 – $12,000 | Linear feet, sump pit and pump, slab breakout |
| Exterior excavation, membrane and weeping tile | $15,000 – $35,000 | Depth, access, linear feet, landscaping restoration |
Planning ranges in CAD for Hamilton-area projects in 2026; HST is extra. These are a starting point, not a quote — every job is priced in writing after a walkthrough. See the Hamilton renovation cost guide for how project types compare.
How long does it take?
Crack repairs and window wells take a day or two. Interior systems take 3–6 days. Exterior excavation and membrane work typically takes one to two weeks, weather permitting.
How we work
Assessment
We find where water is actually getting in, not just where it's showing up.
Plan the fix
Membrane, drainage or grading — whatever actually solves the source, in writing.
Waterproof
Proper membrane and sealing systems installed and inspected.
Finish or hand off
Ready for finishing — we can carry straight into basement finishing if that's next.
What can go wrong with waterproofing — and how we prevent it
- Treating the symptom instead of the source. Sealant on a wall will not fix bad grading or a failed window well. We find where water actually gets in first.
- Exterior digging surprises. Utilities, fences and tight side yards complicate excavation. We confirm locates and access before quoting.
- A sump system with nowhere for water to go. We make sure drainage has a proper discharge, not just a place to collect.
- Finishing over a damp basement. Moisture behind new walls grows mould. We waterproof before framing and finishing.
Why Jopie
Waterproofing is invisible when it's done right, which is exactly why it's tempting to cut corners on. We don't — because the cost of doing it twice is always higher than doing it properly once.
What a client says
They are dependable, reliable, produce top notch work. I was not disappointed when I used them, use them you will not regret.
Ready to finish the space? Waterproofing flows straight into basement finishing, and every bathroom shower gets its own membrane — see bathroom renovation.
FAQ
How do I know if my basement needs waterproofing?
Signs include musty smells, visible dampness or staining on walls/floors, efflorescence (white mineral deposits), or water after heavy rain. A walkthrough can usually identify the source.
How much does basement waterproofing cost?
Crack injection typically runs $600 to $1,500 per crack, interior weeping tile and sump systems $4,500 to $12,000, and exterior excavation with membrane $15,000 to $35,000. We quote in writing after finding the actual source of the water.
Can you waterproof and finish my basement in one project?
Yes — waterproofing first, then straight into framing, drywall and finishing as one coordinated project. See our basement renovation page.
Do you waterproof bathrooms too?
Yes — every wet-area tile job we do starts with proper membrane waterproofing underneath, not just on top.
Based in Hamilton, serving the communities around it
- Hamilton · home base
- Ancaster
- Dundas
- Stoney Creek
- Waterdown
- Binbrook
- Flamborough
- Burlington
- Oakville
- Grimsby
Outside this area? Call us — there's a good chance we cover it.
Other services
Ready to start? Let's quote your project.
Tell us about your project and we'll reply within one business day with a clear written quote — or book a free, no-obligation consultation to talk it through.