416-879-4593 cornerstone@live.ca

Foundation repair and basement waterproofing experts in the Greater Toronto Area

Cornerstone Waterproofing Inc. is a fully licensed and insured company that specializes in foundation repair, underpinning and waterproofing.

Family owned and operated, we take great pride our work and stand behind everything we do to ensure a satisfying and pleasurable relationship with our customers. We strive to build solid connections with homeowners, that has resulted in hundreds of positive referrals and references.

Cornerstone Waterproofing Inc. has waterproofed hundreds of homes, stabilized foundations, lowered basements, installed basement walk-outs, fixed cracks and crumbles, and so much more.

As waterproofing, underpinning and foundation repair specialists, we help make houses safer and more livable. We guarantee our work and back up all of our waterproofing with a 20 year transferable warranty!

We’d love to hear from you and offer an absolutely FREE, no-obligation written estimate before any work is done.

What We Do

Interior & Exterior Waterproofing | Underpinning (Basement Lowering) |
Entrances & Walk-Outs
| Structural Foundation Repair | Concrete Floors & Drains

What People Are Saying

“I have worked with many contractors for many years and there are not enough superlatives to describe the quality, attention and absolute fairness Saverio LoMonaco brings to his company.”

We were referred to Saverio from Cornerstone “Waterproofing by our architect and we are so happy that we were. From our first meeting with Saverio we knew that he was honest, reliable, professional, knowledgeable and competent.”

Read more testimonials and reviews on Homestars here >

Featured Projects

The Anatomy of the Underpin via http://brettfeeley.com/