Foundation Repair in London
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Foundation Repair Services in London
London’s clay-rich soils and wide residential footprint mean wet basements often follow multi-day rains rather than single cloudbursts. Many streets built in the 1960s–1980s are due for perimeter drain renewal.
Browse vetted contractors below and compare written scopes—drainage design, discharge details, and warranty terms usually matter more than the lowest headline price.
Regional guide
London is part of our Southwestern Ontario coverage area. The hub summarizes wider soil, drainage, and housing patterns contractors see across the region—not only this city.
Open Southwestern Ontario hubWhy London Homes Need Professional Waterproofing
Lake-effect snow and spring melts keep soils saturated longer than in drier parts of the province. Homeowners sometimes mistake window condensation for foundation leaks—verification matters before major spends.
Soil & geology
Clay deposits from glacial Lake Whittlesey and related lakeplain sediments dominate much of the city, with sandier pockets near the Thames and its tributaries.
Drainage & grading
Reverse grades toward ranch-style and back-split homes show up after driveway repaving or new landscaping. Sump discharge must terminate where it cannot recirculate against the foundation.
Typical local housing stock
Ranch, raised ranch, and two-storey plans repeat across neighbourhoods; walkout basements along ravine streets need careful stairwell and doorwell detailing.
Common Waterproofing Services
Interior Waterproofing
Interior solutions manage water that enters your basement, directing it safely to a sump pump for removal. This includes drainage channels, sump pump systems, vapor barriers, and interior sealants. Often the most cost-effective solution for existing homes.
Exterior Waterproofing
Exterior waterproofing prevents water from reaching your foundation in the first place. This comprehensive approach includes excavation, membrane application, drainage boards, and new weeping tiles. The gold standard for lasting protection.
Foundation Crack Repair
Cracks in your foundation are common entry points for water. Professional crack injection using epoxy or polyurethane materials seals cracks permanently and can restore structural integrity. Early repair prevents costly damage.
Sump Pump Systems
A reliable sump pump is essential for any interior drainage system. Modern systems include battery backup for power outages, high-efficiency pumps, and smart monitoring. Regular maintenance ensures your system works when you need it most.
Signs You Need Waterproofing
Don't wait until you have a flooded basement to address water issues. Early warning signs include:
- Musty odors in your basement, especially after rain
- Visible water stains or tide marks on walls or floors
- White, chalky deposits (efflorescence) on concrete surfaces
- Peeling paint or wallpaper in basement areas
- Cracks in foundation walls or floors
- Condensation on basement windows or cold surfaces
- Mold or mildew growth on surfaces or stored items
- Increased humidity levels that feel damp and uncomfortable
Choosing a Waterproofing Contractor
Selecting the right contractor is crucial for a successful waterproofing project. Look for companies that offer free estimates, provide written warranties, carry proper insurance and WSIB coverage, and have verifiable references from local customers. Be wary of contractors who demand large deposits or use high-pressure sales tactics.
All contractors in our directory have been vetted for professionalism and quality. We recommend getting at least three quotes to compare pricing and proposed solutions. Remember that the cheapest option isn't always the best value—consider the scope of work, materials used, and warranty coverage.
Frequently Asked Questions About Foundation Repair in London
How much does basement waterproofing cost?
Costs vary based on the scope of work. Interior drainage systems typically range from $3,000 to $10,000, while comprehensive exterior waterproofing can cost $15,000 to $30,000 or more. Crack repairs are more affordable at $300-$800 per crack. Get multiple quotes to compare options and pricing.
How long does waterproofing installation take?
Interior waterproofing projects typically take 2-5 days depending on basement size. Exterior waterproofing requires excavation and may take 1-2 weeks. Weather conditions can affect exterior work timelines. Your contractor will provide a specific timeline during the estimate.
Is there a best time of year for waterproofing?
Interior waterproofing can be done year-round. Exterior work is best done in spring through fall when ground isn't frozen. However, addressing water problems before the wet season (spring in Ontario) is always recommended. Don't wait until you have an emergency.
What warranty should I expect?
Reputable companies offer warranties ranging from 10 years to lifetime transferable coverage. Ensure warranties are in writing and clearly state what's covered. Transferable warranties add value if you sell your home. Verify the company has the stability to honor long-term warranties.
Helpful Resources
Consumer protection and what to know before you hire for home repairs or renovations.
Learn about new home warranty coverage for water penetration issues in Ontario.
Natural Resources Canada resources on improving home energy efficiency and moisture control.
Canada Mortgage and Housing Corporation resources on mould and moisture in housing.
Resources & guides
Practical articles on waterproofing, foundations, and moisture—written for Ontario homeowners.