How Much Does Basement Waterproofing Cost in Ottawa?

Published price ranges for Ottawa

These figures come from HomeStars’ Ottawa basement waterproofing page. They are published ranges for context and are not Aelia quotes. We checked them in October 2026.

• Interior drainage system: about $3,000 to $10,000 for a full perimeter system in an average-sized basement
• Sump pump installation or replacement: about $500 to $2,000, depending on the pump and whether a backup is included
• Exterior waterproofing: about $10,000 to $30,000, depending on foundation size and excavation depth
• Crack injection: about $300 to $800 per crack, depending on length, depth and material
• Labour: about $50 to $150 per hour, depending on the job

Find the source of the water first

Waterproofing is not one product. Water can enter through a crack, at the joint where the floor meets the wall, through the wall itself, or from poor drainage around the house. A drainage fix usually costs far less than excavating the outside of the foundation, so an inspection before a quote matters.

The main options

• Crack injection seals a specific leaking crack from the inside.
• Interior drainage collects water at the base of the wall and directs it to a sump pump.
• A sump pump removes collected water. A backup protects you if the power fails.
• Exterior waterproofing excavates around the foundation to seal and drain it from the outside. It costs the most and is used when the problem is on the outside wall.
• Grading and downspouts move rain water away from the house and are often part of the solution.

What moves the price

• Size of the basement and the length of wall to be treated
• Interior or exterior method
• Excavation depth and access around the house
• Whether the finished basement walls and floors must be opened up
• Pump type and a battery or water-powered backup
• Foundation repairs that are needed at the same time

Before you finish a basement

Ottawa basements deal with freeze and thaw cycles and spring melt. Fix leaks first, then insulate and finish. Finishing over a damp wall hides the problem and can lead to mould. If you are planning to finish the space, read our guide on how long a basement renovation takes.

How to compare quotes

Ask each contractor to put in writing:

• Where they believe the water is coming from
• Which method they recommend and why
• Whether a backup pump is included
• What is included for excavation, backfill and cleanup
• The warranty and what it covers

Get your basement assessed

Aelia Construction and Design offers free assessments across Ottawa, Kanata, Barrhaven, Nepean and Orleans, and can handle waterproofing, foundation repairs and finishing as one project.