Toronto Basement Waterproofing—Permanent, Compliant & Guaranteed
Licensed, WSIB-cleared teams installing to Ontario's 2024 Building Code. We handle permits/inspections and capture the City's Basement Flooding Subsidy (up to $3,400).
Stop the leaks—keep the proof. DrySpace designs and installs code-compliant sump systems, interior/exterior drains, crack repairs and backwater valves. We obtain permits, schedule inspections (~2 business days), and ensure your sump discharge and downspouts meet Toronto rules—so claims and resale go smoothly.
Quick Cost Estimator
Get instant estimates including City of Toronto subsidy eligibility
City of Toronto Subsidy Eligibility
Subject to City approval and inspection requirements
Construction Cost Range
Market reference pricing - final quote after site visit
Permit & Compliance Notes
What You Get With DrySpace
Dry Basement—Permanently
Interior drains, vapor barriers, sump/battery backup, plus exterior membranes when needed.
Compliance Handled
Backwater valve permit + full-port (normally open) device, inspections, final closure.
City Subsidy Captured
We manage documentation to maximize up to $3,400 (BWV $1,250 cap, sump $1,750 cap, drain sever/cap $400 cap).
Excavation Done Safely
Locates via Ontario One Call; trenches follow OHSA and IHSA guidance.
WSIB-Cleared Crews
We provide clearance certificates and verify subcontractors.
24/7 Emergency Response
Average response time under 60 minutes for flooding emergencies in Toronto.
Common Basement Problems We Solve
Identify your basement issue below. We have the right solution for every water problem.
Interior drainage system with sump pump
Water Pooling on Floor
Waterproof membrane and vapor barrier
Wet Basement Walls
Interior perimeter drain system
Cove Joint Leaks
Cove joint sealing and drainage
Wet Floor/Wall Joint
Professional crack injection
Foundation Cracks
Structural repair and waterproofing
Structural Cracks
Foundation stabilization and sealing
Step Cracks
Freeze-thaw damage repair
Winter Freeze Cracks
Moisture control and sealing
Efflorescence (White Deposits)
Concrete repair and waterproofing
Spalling Concrete
Mold remediation and prevention
Mold Growth
Professional mold removal
Black Mold
See Your Problem?
Don't wait for water damage to get worse. We offer 24/7 emergency response and free inspections.
Free Professional Inspection
Our comprehensive inspection identifies all water entry points and provides solutions
Professional Leak Detection
Advanced moisture detection equipment
Drainage Assessment
Checking existing drainage systems
Window Well Inspection
Evaluating window well drainage
Sump Pump Testing
Testing existing sump pump operation
Cost & Timelines
Waterproofing cost depends on method (interior vs exterior), linear footage, access/depth, and add-ons (battery backup, window-well drains). To set expectations, we show City subsidy math and market-context ranges (not a quote).
Market Reference Pricing
- • Interior drain: $75-$120/lin ft (typical Toronto range)
- • Exterior waterproofing: $120-$200+/lin ft (market reference)
- • Sump system installed: $1,800-$3,500+ typical
- • Battery backup add-on: $1,000-$1,700
Toronto Subsidy—Don't Leave Money on the Table
The City offers up to $3,400 per property for backwater valves, sump pumps, and foundation drain sever/cap. We prepare permits, schedule inspections, and submit your documentation.
Project Timelines
Permit (house class): ~10 business days service standard when submission is complete
Inspections: within ~2 business days after request; final closes the permit
Installation: 2-5 days typical (interior); 3-7 days (exterior with excavation)
Example: 120 ft Interior + Sump + BWV
City Subsidy Applied:
*Example only. Actual costs vary by site conditions. Subsidy requires permit/inspection.
Our 6-Step Process
From inspection to warranty, we handle every detail including permits, inspections, and subsidy paperwork
Free Inspection & Diagnostics
Moisture mapping, drain test, camera inspection as needed. We identify the root cause and best solution.
Plan & Compliance
Choose interior/exterior approach; confirm locates/permits; prepare subsidy paperwork.
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Professional Installation
Sequential work: sump pit, interior drain or exterior membrane, backwater valve if applicable. WSIB-cleared crews.
Code & City Checks
Book inspections; ensure sump discharge ≥2 m from foundation; verify downspouts disconnected.
Restore & Clean
Replace concrete, restore finishes, complete site cleanup. Your home returned to better-than-before condition.
Final Close-Out
Final inspection booked; provide WSIB Clearance certificate and complete photo documentation.
Digital Documentation
Every step photographed and documented
Certified Teams
WSIB-cleared, licensed professionals
Premium Materials
Commercial-grade products only
Dedicated PM
Single point of contact throughout
Permits & Inspections: Handled
Toronto requires a stand-alone drain permit for backwater valves and accepts only full-port (normally open) devices. Inspections are typically within ~2 business days and we book the final to close your permit.
Professional Waterproofing Systems
Advanced materials and proven techniques for permanent basement protection
Complete System Diagram
Our comprehensive waterproofing approach combines interior drainage, sump pumps, and exterior protection
Dimpled Membrane System
Advanced drainage membrane creates an air gap and channels water away from foundation
Membrane Texture Detail
High-density polyethylene membrane with dimpled design for maximum drainage
Waterproofing Membrane Application
Rubberized asphalt membrane provides seamless waterproof barrier
New Foundation Protection
Complete exterior waterproofing for new construction or major renovations
Dampproofing Application
Foundation coating to resist moisture penetration
Perforated Drain System
Weeping tile collects and diverts groundwater to sump pit
Foundation Insulation
Combined waterproofing with R-10 styrofoam insulation
Installation Process
Phase 1: Excavation
Safe excavation to foundation base
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Phase 2: Membrane
Waterproof membrane application
Phase 3: Sump System
Professional sump pump installation
Toronto Waterproofing Rules (Plain English)
We navigate all City of Toronto and Ontario Building Code requirements so you don't have to worry about compliance
Backwater Valve Permit
Required for houses; full-port (normally open) valves only; online portal available for faster processing.
Subsidy Program
Maximum $3,400 with caps per item; requires permit/inspection and compliant discharge to qualify.
Sump Discharge Rules
Must discharge to permeable surface ≥2 m from wall; NOT to sanitary/combined sewer per By-law 681.
Downspout Disconnection
Mandatory city-wide requirement to reduce flooding risk; exemptions possible in specific circumstances.
Excavation Safety
Ontario One Call locates required (free, 5 business days notice); OHSA trenching rules apply.
2024 Building Code
Ontario's 2024 OBC (O. Reg. 163/24) in force since January 1, 2025. We ensure full compliance.
We Dig By The Book
We request Ontario One Call locates (it's free and required by law) and follow OHSA trenching rules to protect your property and our crews.
Complete Waterproofing Services
From crack injection to full exterior excavation, we offer every solution needed to keep your basement dry
Interior Waterproofing
Drain channel, sump pump, vapor barrier system. Minimal disruption, maximum protection.
From $75/lin ft
Exterior Waterproofing
Membrane, drainage board, new weeping tile. The gold standard for permanent protection.
From $120/lin ft
Sump Pump Systems
Primary + battery backup. Discharge ≥2m from foundation per City rules. Subsidy eligible.
From $1,800
Backwater Valves
Full-port (normally open) only. Permit + inspection included. Prevents sewer backup.
From $800
Foundation Crack Injection
Epoxy or polyurethane injection. Fast, effective repair for active leaks and structural cracks.
From $300/crack
Window-Well Drains & Grading
Proper drainage and grading to direct water away from foundation. Essential for complete protection.
Custom pricing
24/7 Emergency Service
Flooding doesn't wait. Neither do we. Average response under 60 minutes.
Lifetime Transferable Warranty
Our work is guaranteed for life and transfers to new homeowners.
Full Subsidy Management
We handle all paperwork to secure your City of Toronto subsidy.
Complete Project Gallery
Real waterproofing projects showcasing our complete range of solutions across Toronto
Exterior Waterproofing Installation
Complete exterior membrane installation with drainage
Interior Waterproofing System
Complete interior drain system with sump pump
Sump Pump Installation
Triple-safe sump system with battery backup
Foundation Crack Repair
Professional crack injection and repair
Backwater Valve Installation
City-compliant backwater valve with permit
Basement Leak Inspection
Professional moisture detection and assessment
Waterproofing Membrane Application
Rubberized membrane with dimpled protection
Window Well Installation
Window well with proper drainage system
Foundation Insulation & Waterproofing
Combined waterproofing with styrofoam insulation
Mold Remediation
Professional mold removal and prevention
Efflorescence Treatment
White mineral deposit removal and prevention
Complete System Diagram
Full waterproofing system with all components
Common Problems We Solve
Water Pooling
Wet Walls
Efflorescence
Mold Growth
What Toronto Homeowners Say
Real reviews from verified customers across the GTA. Every project backed by our lifetime warranty.
Interior Waterproofing + Sump + BWV
Sarah Thompson
North York
"DrySpace handled our basement flooding emergency within an hour. They secured the full $3,400 city subsidy for us and managed all permits. Our basement has been bone dry through 3 major storms since."
Exterior Waterproofing
Michael Chen
Scarborough
"Professional team that knows Toronto building codes inside out. Inspection was scheduled within 2 days as promised. The exterior waterproofing has completely transformed our home's foundation protection."
Backwater Valve Installation
Jennifer Martinez
Etobicoke
"The backwater valve installation was completed in one day with full permit approval. DrySpace handled everything including the subsidy application. Saved us $1,250!"
Sump Pump + Battery Backup
David Kumar
Toronto
"WSIB-cleared crew, proper permits, city inspections - these guys do everything by the book. The battery backup sump system has given us complete peace of mind."
Emergency + Full System
Lisa Anderson
Mississauga
"Emergency response in 45 minutes during the July flooding. They pumped out our basement and installed a complete waterproofing system. Insurance claim went smoothly with their documentation."
Crack Injection
Robert Wilson
Vaughan
"Foundation crack injection stopped a 5-year leak in just 4 hours. Lifetime warranty and professional service. They even helped with downspout disconnection to meet city requirements."
Excellence in Waterproofing
Lifetime Transferable Warranty
Fully Licensed & Permitted
Industry Experience
Frequently Asked Questions
Get answers to common questions about basement waterproofing, permits, and subsidies in Toronto
Do you handle the City's subsidy?
Yes. We manage the application and required inspections for Backwater Valve, Sump Pump, and Foundation Drain Sever/Cap (caps $1,250 / $1,750 / $400; $3,400 max).
Do I need a permit for a backwater valve?
Yes—Toronto issues a stand-alone drain permit; full-port (normally open) valves only.
Where can my sump discharge?
To a permeable surface ≥2 m from your foundation; NOT to a sanitary/combined sewer.
Will insurance cover a sewer backup?
Not automatically—sewer-backup (and overland) coverage is usually optional. Ask your insurer.
How fast are inspections?
Toronto targets within ~2 business days after request; we also schedule final to close the permit.
Do you call locates before exterior digs?
Yes—Ontario One Call locates are free and required by law; we arrange them.
What's included in your lifetime warranty?
Our lifetime warranty covers all waterproofing work, materials, and labor. If water enters through our protected areas, we fix it free—no questions asked.
How long does installation take?
Interior waterproofing typically takes 2-5 days. Exterior excavation projects run 3-7 days. We provide a detailed timeline during your inspection.
Can I stay home during the work?
Yes, for most interior projects. We use dust barriers and maintain a clean workspace. For major excavations, we'll discuss any temporary accommodations needed.
Do you offer financing?
Yes, we offer flexible financing options with approved credit. Combined with the City subsidy, most homeowners can protect their basement with minimal upfront cost.
Have More Questions?
Our waterproofing experts are ready to answer your specific questions and provide a free inspection.