Foundation Waterproofing & Custom Window Well Covers
Interior basement waterproofing for homes across Mississauga and the West GTA. Crack injection, Delta membrane and drainage tile, sump pumps and made-to-measure window well covers.
Book a Free InspectionOur Services
We fix leaky basements from the inside, and keep water out of your window wells.
Custom Window Well Covers
A lot of basement leaks start at the window well. Our covers are built to fit yours and keep the water out.
- Keeps out rain, snow, leaves and animals
- Made to measure for your window well
- Lets the light in
- Removable in an emergency
- Made in Canada
Areas We Serve
Proudly serving Mississauga and the West GTA.
- Mississauga
- Oakville
- Burlington
- Milton
- Georgetown
- Brampton
- Etobicoke
- West Toronto
What Our Customers Say
Rated 4.5 out of 5 on Google
I'm impressed with the company. I called to ask about a check valve missing from my sump pump that the previous owner had installed by Crown Seal. Wayne and Randy came out and helped me out. They were friendly and did the job for a reasonable sum. Big thumbs up!
Within 2 hours of calling, Wayne turned up and gave us a reasonable quote. 2 days later, Randy fixed the crack in our basement and slight water leak. Randy was fantastic! ...
Wayne is fantastic, quickly troubleshoots the issue, fast quote and fast repair. Highly recommend!
About Us
Crownseal Inc. is a family owned and operated business that has been keeping basements dry in Southern Ontario since 1988. Waterproofing is all we do. We use top of the line products and back our work with a 25-year transferable warranty.
Learn more about usWhy Choose Crownseal
Family Owned Since 1988
Basement waterproofing is all we do, and we've been doing it for over 35 years.
25-Year Transferable Warranty
We stand behind our work. If you sell your home, the warranty goes with it.
Free Inspections
We come out, find where the water is getting in and tell you straight what it needs.
Got a Leak? Let's Fix It.
Call us at 905-564-3575 or send us a message. Inspections are free.
Book a Free Inspection