Basement waterproofing in Ontario
Water on the floor after a storm, damp walls and a musty smell, cracks that seep in spring, or a sump pump that keeps running: tell us what you see. We will arrange an on-site inspection of where the water is coming in and a clear written plan — no package prices, no sales script.
Cities we cover
Local pages for Toronto, Ottawa, Mississauga, Brampton and more, with ground conditions, groundwater, flood history and official contacts for each city.
Toronto
Toronto basement waterproofing questions often come down to lakebed clays, combined sewers and the July 8, 201
Ottawa
Ottawa basement waterproofing questions often come down to sensitive Leda clay and the 2017 and 2019 Ottawa Ri
Mississauga
Mississauga basement waterproofing questions often come down to Credit River valley and the July 2013 storm. T
Brampton
Brampton basement waterproofing questions often come down to newer subdivisions on clay till and Etobicoke Cre
Hamilton
Hamilton basement waterproofing questions often come down to the escarpment, clay soils and the Protective Plu
London
London basement waterproofing questions often come down to Thames River flood history and clay till. Typical w
Markham
Markham basement waterproofing questions often come down to Rouge River watershed and clay till. Typical work
Vaughan
Vaughan basement waterproofing questions often come down to Oak Ridges Moraine soils and Humber River tributar
Kitchener
Kitchener basement waterproofing questions often come down to Waterloo Moraine sands and the Grand River. Typi
Windsor
Windsor basement waterproofing questions often come down to flat lakebed clay and the 2016 and 2017 floods. Ty
Oshawa
Oshawa basement waterproofing questions often come down to Lake Iroquois shoreline soils and older neighbourho
Barrie
Barrie basement waterproofing questions often come down to sandy soils, Kempenfelt Bay and snowbelt weather. T
Basement waterproofing services
From crack repair to full drainage systems — what we help with below grade.
Interior basement waterproofing
Interior weeping tile along the footing, wall membranes and a sump to carry water away.
Exterior foundation waterproofing
Excavation, membrane and new weeping tile on the outside of the foundation wall.
Sump pumps & backwater valves
New sump pits, replacement pumps and backup, plus backwater valves to stop sewer backup.
Foundation crack injection
Sealing leaking cracks in poured walls and repairing joints in block foundations.
Weeping tile & yard drainage
Weeping tile replacement, downspout disconnection, grading and window-well drainage.
Basement dehumidification & damp control
Dehumidifiers, vapour control and moisture management for damp, musty basements.
Basement waterproofing across Ontario
A basement sits in the ground, so rain, snowmelt and groundwater press against it every season. Water finds cracks, the joint between wall and floor, window wells and tie holes first. Ontario Basement Waterproofing focuses on finding where the water is coming in and fixing it at the source — in Toronto, Ottawa, Mississauga, Brampton and throughout Ontario.
Some homes need a crack sealed or a downspout redirected; others need interior drain tile and a sump pump, or exterior excavation and a membrane. The inspection decides, not a sales script.
Straight answers on cost
Costs depend on the size of the basement, the cause of the water, access and the system chosen, and we explain them after the inspection. Our cost guide lists the factors that drive the price.
How we work
- Send the form with your city, property type and what you are seeing.
- We get back to you to talk it through and arrange an on-site inspection.
- You receive a written scope and estimate to approve before work starts.
- Waterproofing and drainage work to the agreed scope, with photos and notes for your records or insurer.
Quick answers
How do I get help?
Send the request form with your city, property type and what you are seeing. It is open 24/7.
Do you inspect before quoting?
Yes. The source of the water decides the fix, so every basement is inspected on site before a written estimate is given.
Are prices listed?
No. Estimates follow an on-site assessment.
Where do you cover?
See the areas pages for cities across Canada/Ontario.
Water in the basement now?
Keep electrics away from standing water, move belongings up, check the sump pump if it is safe, take photos, then send us the form.
Request an inspection