How much do contractors charge for french drain install in Calgary?

French drain installation in Calgary typically runs $3,000–$12,000+ for a residential project, with most homeowners spending in the $4,000–$7,000 range for a standard perimeter or yard drainage solution. The wide range reflects how dramatically scope, access, and soil conditions affect the job.

What Drives the Cost

Calgary's expansive clay soils are the single biggest factor in your pricing. Clay doesn't drain — it holds water against your foundation and swells when wet, which is exactly why French drains are so common here. Digging through heavy clay takes more time and equipment than sandy or loamy soils, and proper gravel bedding becomes even more critical. Expect contractors to use a minimum 4-inch perforated pipe wrapped in filter fabric, with clean crushed gravel surround — cutting corners on materials in Calgary clay is a recipe for a clogged system within a few years.

Typical price ranges by scope:

• Simple yard drainage (single trench, 20–40 ft): $1,500–$3,500
• Foundation perimeter drain (exterior, partial): $4,000–$8,000
• Full exterior perimeter drain (all four sides, with discharge to storm or sump): $8,000–$20,000+
• Interior weeping tile system (inside basement perimeter): $5,000–$15,000 depending on basement size

Exterior full-perimeter work is significantly more expensive because it involves excavating down to your footing depth — in Calgary, that means digging 4+ feet to get below the frost line, and often 6–8 feet to reach the footing. That's serious excavation work.

Calgary-Specific Considerations

Most residential French drain projects in Calgary don't require a building permit on their own, but if the work connects to your municipal storm sewer or involves your foundation drainage system, you'll want to confirm with the City of Calgary (311 or calgary.ca/development). If you're adding or replacing a sump pump pit as part of the project, a plumbing permit may be required.

Also worth noting: Calgary's chinook freeze-thaw cycles are brutal on drainage systems. Discharge points and outlet pipes need to be designed so they don't freeze solid in winter, which can back up the entire system. A good Calgary contractor will account for this in the design.

DIY vs. Hiring a Pro

Surface-level yard drainage trenches are within reach of a motivated DIYer with a rented trencher ($200–$400/day) — materials for a basic system run $500–$1,500. However, anything touching your foundation, connecting to municipal storm infrastructure, or requiring significant excavation should be handled by an experienced drainage contractor. Foundation drainage mistakes in Calgary's clay can lead to water infiltration, heaving, and structural damage that costs far more to fix than the original job.

When getting quotes, ask contractors to specify:

• Pipe diameter and type (4" minimum, SDR35 or equivalent)


• Gravel specification (clean crushed, not pit run)


• Filter fabric (geotextile sock on pipe AND fabric lining the trench)


• Where water discharges (sump pit, storm sewer, daylight outlet)


• Whether they'll compact and restore the disturbed area

Browse drainage and excavation contractors in our directory at Calgary Construction Network to get a few local quotes — prices can vary significantly between contractors, so comparing two or three estimates is well worth the time.