416-879-4593 cornerstone@live.ca

At Cornerstone Waterproofing Inc., we take great pride in building trustworthy, communicative relationships with our customers, often resulting in great reviews and referrals!

This is what some of our satisfied customers have to say via Homestars:

“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.”

“Saverio and his crew just finished lowering and underpinning our basement – they were excellent. Saverio started on time, finished early and came in on budget. He was on site every day and had was very responsive to any question I had. The whole team was tidy, efficient and well organized. I would recommend Cornerstone to anyone.”

“Our contractor, Saverio from Cornerstone Waterproofing was amazing. His crew (Kyle, Kyle and Charlie) were polite, clean and accomodating. I can highly recommend them without hesitation. Saverio will go above and beyond what is asked of him. “

“Saverio was probably one of the best contractors that I’ve hired because he was so conscientious and holds himself and crew to high standards.”


Satisfaction Guaranteed!
All waterproofing work is backed by a 25-year warranty.

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


"CORNERSTONE WATERPROOFING delivers 110%, Grade AA work!"

“The finished product was beyond our expectations.”

"Top quality workmanship & peace of mind -- that's what Saverio & his crew deliver!"