French Drain Installation, Replacement and Excavation Services
Protect Your Home with Our French Drain Services
Water pooling near your foundation? Dampness in your basement? Musty odors after rain? These are signs your property needs professional french drain installation. Whether you need exterior french drain installation or complete drainage system replacement, acting now prevents thousands in future foundation damage.
With over 15 years of expertise, Excavation Chanthier installs and replaces french drains throughout Greater Montreal, Laval, South Shore, North Shore, and Lanaudière. Our RBQ-certified operators (#5644-4649-01) deliver quality work that meets municipal standards.
French Drain Installation
Protect your foundation with an exterior French drain installed around your property’s perimeter. We excavate down to the footings (6-8 feet deep), apply waterproofing membrane to foundation walls, install 4″ perforated PVC pipes surrounded by ¾” crushed stone, and restore your property completely.
What’s included:
- Excavation around foundation perimeter to footing level
- Foundation wall cleaning and waterproofing membrane (Delta-MS or elastomeric)
- Perforated drainage pipes with geotextile fabric
- Crushed stone backfill for optimal water flow
- Connection to drainage outlet or municipal system
- Complete landscape restoration
Best for preventing water infiltration, protecting foundation walls, and managing groundwater around your property.
French Drain Replacement
Drainage system over 40 years old? Clay pipes deteriorating? Ferrous ochre clogging your drains? We replace failing French drain systems with modern materials that last 25-40 years.
Replacement service includes:
- Complete removal of old deteriorated drainage pipes
- New 4″ perforated PVC system installation
- Updated waterproofing membrane if needed
- Modern materials resistant to root intrusion and corrosion
- Full system testing and inspection
We handle exterior French drain replacement throughout Greater Montreal.
WHY CHOOSE EXCAVATION CHANTHIER
RBQ-certified expertise (#5863-7802-01) Licensed contractors who follow Quebec building codes and municipal regulations. Your french drain work meets all safety standards.
Modern excavation equipment Case 145 and 235 excavators for precise work. We dig to the required depth while protecting your property.
Complete waterproofing solutions More than french drain installation. We offer Delta-MS membrane application, crack repair, and proper drainage connections.
Quality materials Premium 4″ perforated PVC pipes, ¾” crushed stone, durable geotextile fabric, and professional waterproofing membranes. Materials that last decades.
Complete property restoration Careful backfilling, compaction, and grading. Your lawn, driveway, and landscaping restored to original condition.
Transparent pricing Clear itemized quotes with no hidden fees. You know exactly what’s included in your french drain cost.
Greater Montreal coverage Serving Montreal, Laval, Longueuil, Brossard, North Shore, and Lanaudière. We understand local soil conditions and municipal requirements.
Ready to protect your foundation? Request your free quote or call us to discuss your drainage needs.
« Quality service in French Drain installation, replacement and excavation»
HOW MUCH DOES A FRENCH DRAIN REALLY COST?
French Drain Cost Guide – Montreal 2025
This is THE #1 concern – and for good reason. French drain costs in Montreal vary dramatically, and most homeowners are shocked when quotes come in 25-50% higher than expected.
USE OUR REAL-TIME CALCULATOR FOR YOUR EXACT PRICE
The calculator provides baseline estimates of $100-350 per linear foot, but 68% of projects exceed initial budget by 15-25% due to hidden variables, so you have to be careful.
2025 MONTREAL PRICING BREAKDOWN
Base Costs:
- New Installation: $100-350 per linear foot
- Replacement: $125-400 per linear foot (25-30% more expensive)
Typical 100-foot Project Total: $15,000 without any options and special factors like:
- Soil type
- Property accessibility
- Underground obstacles
- Foundation layout
- Time of year
REGIONAL PRICE VARIATIONS
Montreal borough and surrounding city costs vary significantly:
Anglophone Areas:
- Westmount: +10-15% (high-end finishes, client expectations)
- West Island (DDO, Pointe-Claire, Beaconsfield): Base to +5%
- Laval: -5 to -10% (more accessible terrain)
- Vaudreuil-Dorion: -8 to -12% (local labor, easier access)
WHAT’S INCLUDED IN THE TOTAL PRICE
The cost breaks down into components: Excavation (30-40%), Materials (25-30%), Labor (30-35%), Equipment (5-10%), and Contractor margins (15-25%)
Standard installation includes:
- Complete excavation around foundation to footing level
- Old drain removal (if replacement)
- New BNQ-certified perforated pipe
- 0-¾” clean gravel (24″ coverage)
- Geotextile membrane wrapping
- Foundation waterproofing membrane (highly recommended)
- Backfilling and site restoration
- Permits: $300-800 (free in our case)
- Taxes: +14.975%
BEST TIME TO SAVE MONEY
November offers 15-20% savings with excellent contractor availability and 1-week timelines, while December-March adds 30-50% for emergency pricing.
Seasonal pricing:
- May-June: Base price (2-3 week wait)
- July-August: +10-15% peak pricing (4-6 week wait)
- September-October: -10-15% (BEST VALUE!)
- November: -15-20% end-season deals
- December-March: +30-50% emergency only
AVAILABLE SUBSIDIES & FINANCIAL AID
Montreal RénoPlex Program:
- $54 per linear meter for French drain installation/replacement
- Maximum $20,000 (single-family) or $40,000 (2-5 units)
- Building value must be ≤ $3,476/m²
- Additional: $1,500 for new catch basin and pump system installation
Provincial Rénoclimat Program:
- Still active for energy efficiency improvements
- Foundation insulation may qualify
- Requires pre and post-renovation energy evaluations
IMPORTANT NOTES:
- RénoPlex approval must be obtained BEFORE starting work – renovations already started are not eligible
- RBQ licensed contractor required for work
- 18-month deadline to complete project once approved
- Programs operate on first-come, first-served basis with limited budgets
RED FLAGS – SUSPICIOUS PRICING
Price under $100/ft indicates inadequate materials leading to redo in 5 years, while price over $400/ft without rock presence suggests overcharging.
Warning signs:
- Deposit over 30% (should be max 15%)
- No RBQ license
- Pressure to sign immediately
- Mid-project “discovery” price increases
HOW DO I KNOW WHEN MY FRENCH DRAIN NEEDS REPLACEMENT?
When to Replace Your French Drain – Montreal
This is CRITICAL – many Montreal homeowners ignore early warning signs, leading to foundation damage costing $15,000-$50,000 to repair.
IMMEDIATE ACTION REQUIRED – URGENT WARNING SIGNS
- Water Infiltration in Basement
- Constant dampness, musty smells, water leaks, or mould in the basement indicate the system isn’t working well
- Pooling water after heavy rain
- Water seeping between wall and floor slab
- Efflorescence (white powder) on concrete
- Foundation Damage
- New cracks appearing in foundation walls
- Existing cracks widening
- Bowing or bulging walls
- Rust-colored stains on concrete
- Exterior Drainage Problems
- Water pooling against foundation
- Soggy, spongy soil around perimeter
- Sinking or settling around foundation
- Visible erosion near foundation
- Sump Pump Issues
- Pump running constantly
- Orange-colored slimy sludge in catch basin (FERROUS OCHRE!)
- Sulphur smell like rotten eggs
- Backup during heavy rain
AGE & LIFESPAN CONSIDERATIONS
A properly installed French drain can last between 25 and 40 years, depending on soil, materials, and maintenance.
Critical age brackets:
- Pre-1970 homes: May have clay tile drains (obsolete, needs replacement)
- 1970s-1990s homes: Likely approaching end of lifespan (25-30 years)
- Pre-1955 homes: Basements historically were never intended to be inhabited in Quebec – may not even have French drains!
INSPECTION OPTIONS
Camera Inspection: $150-250 annually recommended
- Shows interior drain condition
- Detects blockages, cracks, collapses
- Reveals ferrous ochre presence
- Essential before buying a home!
Inspection involves excavating access wells to check drain position and backfill materials, then inserting a camera to capture the drainage system state.
HIDDEN DEFECTS (LATENT DEFECTS) – BUYER BEWARE
French drains have become one of the most frequent claims for latent defects – they are rarely properly assessed during pre-purchase inspection.
What qualifies as a hidden defect:
- Seller didn’t disclose known drain problems
- Problem existed at time of sale
- Serious enough to affect property value or safety
- Unknown to buyer at purchase
Seller obligations:
- Must disclose known French drain issues
- Must disclose ferrous ochre presence
- Professional warranties are transferable upon sale of property
IMPORTANT CAVEAT FROM INSPECTION EXPERTS
Many contractors will try to convince homeowners to install a new French drain because that’s what they do – it’s easy to sell. Most basements are damp, but installing a new French drain may not solve the problem.
Get an independent assessment before committing to expensive work!