# French Drain Installation Toronto | From $85 CAD per Foot URL: https://foundationwaterproofingtoronto.ca/french-drain-installation-toronto/ verified Surface Water Control # French Drain Installation Toronto: Yard Drainage and Downspout Tie-Ins Last updated: September 16, 2026 ![Foundation Waterproofing Toronto crew laying perforated drainage tubing in a gravel trench across a Toronto back yard](/images/maps/two-crew-members-in-branded-shirts-laying-perforat.webp) engineering Perforated pipe in gravel, graded to discharge PER LINEAR FOOT **Foundation Waterproofing Toronto** [/ →](/) provides basement waterproofing, foundation crack repair, sump pump and backwater valve installation, and interior and exterior weeping tile systems throughout Toronto, ON, backed by 25+ years of experience under Ontario Building Code Part 9. French Drain Installation Toronto lays perforated pipe in a gravel trench to collect surface and yard water and carry it away from the foundation, integrating downspout drainage and grading correction so hydrostatic pressure never builds against the basement wall in the first place. It is the exterior surface water half of foundation waterproofing, priced by the linear foot in CAD, and on many GTA lots it reduces the size of the drainage system the basement needs. payments Scope CAD cost anchor French drain installation runs $85 to $175 CAD per linear foot. A typical residential run of 40 to 80 feet lands between $3,400 and $14,000 CAD depending on depth, discharge distance, and reinstatement. Downspout disconnection and grading correction start at $400 CAD. The in-home inspection is free. - check\_circle 25+ years experience - check\_circle OBC Part 9 compliant - check\_circle Free in-home inspection - check\_circle written workmanship warranty calendar\_month Book Free In-Home Inspection [/contact/ →](/contact/) call Call (647) 254-5110 [tel:+16472545110 →](tel:+16472545110) assignment ## Diagnostic Inspection Request Free in-home inspection with a written diagnostic, anywhere in the Toronto GTA. **Thanks, we have your request.** A Toronto dispatcher will call you to confirm the inspection slot. - workspace\_premium 25+ Years Experience - bolt Same-Day GTA Emergency Response - verified\_user Written Workmanship Warranty - gavel OBC Part 9 Compliant - savings Up to $3,400 CAD Subsidy Filed ## How a French Drain Relieves Hydrostatic Pressure Foundation Waterproofing Toronto has installed French drains and yard drainage across Toronto and the GTA for more than 25 years, as the surface water management half of a foundation waterproofing strategy. A French drain is **perforated Big O corrugated drainage tubing** laid in a trench of **clear drainage gravel aggregate**, wrapped in non-woven geotextile fabric, and graded so water flows to a discharge point. Water in the surrounding soil enters the stone, finds the perforations, and leaves along the pipe instead of sitting in the ground. For a foundation, that matters because of what saturated soil does. Water held in clay next to a basement wall builds hydrostatic pressure, and that pressure is what pushes water through the cove joint and the cracks. Improving soil drainage before the water reaches the wall is **hydrostatic relief** delivered at the cheapest point in the system, and it is far cheaper than the foundation repair that years of saturated clay eventually cause. ## Downspouts and Grading: The Cheapest Load to Remove Before any interior or exterior basement system, we look at how much water is being delivered to the foundation by the property itself. A single downspout on a modest Toronto roof discharges thousands of litres during a heavy storm. Dumped at the base of the wall, all of that goes into the soil at the one place you least want it. A **downspout disconnect** with a proper extension or a tie-in to a drain run removes that load for a few hundred dollars, and the City of Toronto already requires downspouts to be disconnected from the sewer system on most properties. **Yard re-grading** does the same for sheet flow. The standard is **positive slope away from foundation**, roughly 150 mm of fall over the first 1.8 metres. Settled backfill from an old excavation, a neighbour’s raised grade, or twenty years of garden bed topping up will all quietly reverse that slope. On the narrow side yards between semi-detached houses in East York and the older bungalows of Scarborough [/service-areas/scarborough/ →](/service-areas/scarborough/) , reversed grade is the most common surface water fault we find. These two items together are often the first thing we quote, because on many lots they reduce the basement scope from a system to a repair. ## Which Yard Drainage Scope Does Your Toronto Lot Need? | Scope | Cost in Toronto (2026 pricing) | What it removes | | --- | --- | --- | | Downspout disconnect and grading | $400 to $1,800 CAD | Roof discharge and reversed slope, the cheapest load to take off the foundation | | Single-run French drain | $3,400 to $7,000 CAD | One wet area intercepted on its uphill side and routed to a legal outlet | | Perimeter yard drainage | $7,000 to $14,000 CAD | Sheet flow around the whole lot, with catch basins at low points and downspout tie-ins | | Drain plus dry well | $5,000 to $16,000 CAD | Sites with no storm connection or daylight outlet, sized for the catchment | ## How We Compare | What you get | Typical provider | Foundation Waterproofing Toronto | | --- | --- | --- | | Pricing | Quoted only after a site visit | $85 to $175 CAD per linear foot published on this page (2026 pricing) | | Bedding stone | Pea gravel, often with fines | Clear washed stone that keeps its voids open | | Filter | Unwrapped pipe or no cloth | Non-woven geotextile fabric wrapped over the stone bed | | Fall | Laid by eye | Designed gradient confirmed with a laser level | | Discharge | Wherever the trench ends | Storm connection, daylight outlet, or sized dry well, never the sanitary sewer | | Warranty | Unstated or verbal | Written workmanship warranty issued at completion | ## Designing the Run: Route, Depth, Fall and Discharge When a French drain does not work, the cause is usually the design, not the installation. **Route.** The pipe has to intercept water where it travels, which is usually the uphill side of the wet area, not the wet area itself. On the ravine-edge lots of North York and the sloped back yards of Etobicoke [/service-areas/etobicoke/ →](/service-areas/etobicoke/) , that often means a run across the top of the yard rather than along the house. **Depth.** Typically 450 to 900 mm. Deep enough to sit below the water you are collecting, shallow enough that the discharge point can still be lower than the pipe. **Fall.** Continuous gradient to the outlet, confirmed with a laser level. A flat section becomes a silt trap and the run behind it backs up. **Discharge.** This is the constraint that decides everything else. A storm connection where one exists and is permitted, a daylight outlet at a low point on the lot, or a **dry well discharge** chamber sized for the catchment. Where none of those is available on a flat lot, the run can end in an exterior sump basin with its own sump pump [/sump-pump-installation-toronto/ →](/sump-pump-installation-toronto/) that lifts the water to a safe outlet at grade. Never the sanitary sewer. **Catch basins.** At low points and at downspout tie-ins, with removable baskets so leaf debris is caught where you can reach it instead of inside the pipe. Before any trench is cut, utility locates are requested through Ontario One Call, because gas, hydro, and cable lines cross most Toronto back yards at shallow depth. ## Why Do Cheap French Drains Fail? The failed drains we are called to replace almost all trace back to three shortcuts. Pea gravel instead of clear washed stone. Pea gravel contains fines that migrate into the voids and choke the drain within a few seasons. No filter cloth. Without non-woven geotextile fabric separating stone from soil, silt moves into the stone bed and eventually into the perforations. No designed fall. A pipe laid by eye across an undulating yard will have low spots, and low spots hold water and sediment. The material cost difference between doing it properly and doing it cheaply is small. The labour is identical. The lifespan difference is measured in decades. ## When Your Basement Needs More Than a Yard Drain The Foundation Waterproofing Toronto crew turns down yard drainage work regularly, because a French drain only solves water that arrives from the surface. If basement water appears during the spring thaw regardless of rainfall, the water table under the slab is the driver, and a yard drain at 600 mm depth will never reach it. Interior weeping tile [/interior-weeping-tile-toronto/ →](/interior-weeping-tile-toronto/) is the correct scope. If water is entering through a single crack that leaks during every rain, the crack injection [/foundation-crack-repair-toronto/ →](/foundation-crack-repair-toronto/) at $500 to $1,200 CAD is the proportionate fix. If the yard drains freely and the grade already runs away from the house, there is nothing for a drain to collect. The free in-home inspection covers the lot as well as the basement, and the written diagnostic ranks what to do in what order, with the CAD number against each. Often the first line on that list is the cheapest one, which is why surface water work is quoted ahead of any larger foundation waterproofing Toronto [/ →](/) system. Diagnosis ## 5 Signs Your Toronto Yard Needs a French Drain A French drain solves water that arrives at the surface. These five conditions are the ones that make it the right first spend, often before any basement work at all. 1. 01 ### Standing water in the yard days after rain Water that sits for more than a day means the soil is saturated and has nowhere to drain, and that saturated soil is pressing against your foundation the whole time. 2. 02 ### A low corner that stays soft Perpetually spongy ground near the house is a sign the water table is high at that point, and it is where a drain run should start. 3. 03 ### Downspouts discharging at the wall A single downspout can deliver thousands of litres per storm to one square metre of soil. Tying it into a drain run removes that load entirely. 4. 04 ### The ground slopes back toward the house Negative grade from a neighbouring property or a settled backfill trench sends surface water straight to the foundation, which no interior system can prevent. 5. 05 ### Basement seepage that tracks heavy rain exactly When basement water follows rainfall closely rather than seasonal thaw, surface water is likely the driver, which puts exterior drainage ahead of interior in the sequence. Our framework ## How Our Toronto French Drain Installation Works, 5 Steps Most residential runs are completed in two to four days, weather depending, and the design work happens before anything is dug. 1. 1 map ### Map the water We walk the lot during or after rain where possible, identify the high and low points, check downspout discharge, and establish where water is entering and pooling. 2. 2 description ### Design the run and discharge Pipe route, depth, fall, catch basin locations, and the discharge point are set before excavation, because a drain with no legal outlet is just a buried trench. 3. 3 construction ### Trench and bed The trench is cut to the designed fall, lined with geotextile filter cloth, and perforated pipe is bedded in clear washed stone. 4. 4 build ### Connect and backfill Catch basins and downspouts are tied in, the cloth is wrapped over the stone, and backfill is placed and compacted. 5. 5 verified ### Grade and test The surface is regraded to positive slope, fall is confirmed with a laser level, the run is flushed and tested, and the warranty is issued. Published CAD Pricing ## How Much Does a French Drain Cost in Toronto? French drains are priced by the linear foot, with depth, soil, discharge distance, and reinstatement driving where in the range you land. These are the published CAD bands, and the free inspection confirms the run length your lot actually needs. ### Downspout and Grading Correction $400 to $1,800 CAD The cheapest surface water work: extend or relocate downspouts and re-establish positive slope away from the wall. - check Downspout disconnect and extension - check Positive slope re-graded - check Often reduces the system scope you need Most requested ### Short Run French Drain $3,400 to $7,000 CAD 40 to 50 linear feet along one side of the house or across a low corner of the yard. - check Perforated pipe in clear stone - check Geotextile filter cloth - check Discharge to a safe outlet ### Full Perimeter Yard Drainage $7,000 to $14,000 CAD 80 to 100 linear feet wrapping the wet side of the property, usually with catch basins. - check Catch basins at low points - check Downspouts tied into the run - check Laser-checked fall across the whole line ### Drain With Dry Well Discharge $5,000 to $16,000 CAD Where there is no storm connection or grade-level outlet, the run terminates in a buried dry well chamber. - check Sized dry well chamber - check Overflow detailing - check Full reinstatement of the surface above Where the drain replaces or reduces the need for a basement drainage system, the written diagnostic says so and shows both numbers side by side. Straight answers ## What Toronto Homeowners Ask Before Installing a French Drain ### Will a French drain fix my wet basement on its own? Sometimes, and that is worth checking first. Where basement water tracks rainfall and the yard holds water, reducing the surface load can be enough. Where water arrives from a high water table under the slab, a yard drain will not reach it, and the diagnostic will say so plainly. ### Where does the water actually go? To a discharge point: a storm connection where one exists and is legal to use, a grade-level outlet at a lower part of the property, or a buried dry well sized for the catchment. It never goes into the sanitary sewer. ### Will this destroy my lawn? The trench line is open during the work and reinstated afterward. Sod over a trench takes a season to blend. We quote reinstatement as its own line so you can decide whether we restore it or your landscaper does. ### Can I use a shallow surface drain instead? Surface channel drains handle hard-surface runoff well, on a patio or driveway, but they do nothing for saturated soil. A French drain works below grade, which is where the water pressing on your foundation actually is. Why us ## Why Toronto Homeowners Choose Us for French Drain Installation engineering ### 25+ Years of Foundation Waterproofing Experience We design yard drainage as part of a foundation strategy, not as landscaping, which is why our runs target the water actually loading the wall. receipt\_long ### Cheapest Effective Fix First If a $900 CAD downspout and grading correction reduces your problem enough, the diagnostic says that before it recommends a $9,000 CAD run. search ### Designed Fall, Not Guessed Every run is laid to a designed gradient and confirmed with a laser level. A flat drain is a silt trap. tune ### Proper Filter Detailing Clear washed stone wrapped in non-woven geotextile filter cloth, which is what keeps fines out and the perforations open for decades. gpp\_good ### Legal Discharge Every Time Storm connection, grade outlet, or dry well. Never the sanitary sewer, which is both illegal and part of why Toronto basements flood. payments ### Published Per-Foot Pricing $85 to $175 CAD per linear foot on the page so you can estimate your own run before calling. Our work ## French Drain Installation Projects Across the GTA Documentary photos from Toronto basements and foundation trenches. Select any image to enlarge. Customer Feedback ## What Customers Say About Our French Drain Installation Verified project feedback from Toronto and GTA homeowners. Names are shortened for privacy. format\_quote > Our back yard held water for days after every storm and the basement wall was damp along the same side. Sixty feet of French drain with two catch basins for about $7,400 CAD and both problems went away together. Colleen M.Islington format\_quote > They started by moving two downspouts and regrading for under $1,000 CAD, then said to watch it for a season before deciding on the full drain. We never needed the full drain. Andres P.Humber Summit format\_quote > The dry well was the part I did not understand until they explained it. No storm connection on our street, so the run terminates in a buried chamber at the back of the lot. Yard has been dry two springs running. Farrah B.Clairlea Answers ## French Drain Installation FAQs How much does a French drain cost in Toronto? expand\_more French drains in Toronto run $85 to $175 CAD per linear foot (2026 pricing). A 40 to 50 foot run lands between $3,400 and $7,000 CAD, and a full yard perimeter of 80 to 100 feet is typically $7,000 to $14,000 CAD depending on depth and discharge. Downspout and grading correction alone starts at $400 CAD, and the in-home inspection is free. What is the difference between a French drain and weeping tile? expand\_more The construction is similar, perforated pipe in gravel, but the job is different. Weeping tile sits at the footing and drains the foundation. A French drain sits in the yard and intercepts surface and shallow ground water before it ever reaches the foundation. How deep does a French drain need to be? expand\_more Typically 450 to 900 mm depending on the water you are intercepting and the fall available. Deeper is not automatically better. What matters is that the pipe sits below the water you need to collect and has continuous fall to the discharge. Where does a French drain discharge to in Toronto? expand\_more A storm connection where one exists and is permitted, a daylight outlet at a lower point on the property, or a sized dry well chamber. Discharging into the sanitary sewer is not permitted and contributes to the surcharges that flood basements. Will a French drain stop my basement from leaking? expand\_more It removes surface and shallow ground water load. If your basement water follows rainfall and your yard holds water, it can make a significant difference. If water is rising under the slab from a high water table, interior weeping tile is still required. Do French drains clog? expand\_more Improperly built ones do, quickly. Clear washed stone wrapped in non-woven geotextile filter cloth keeps fines out, and catch basins with removable baskets keep leaf debris out of the pipe. Pea gravel with fines and unwrapped pipe are the two reasons drains silt up. Can you tie my downspouts into the French drain? expand\_more Yes, and it is usually the highest-value part of the job. A downspout delivers an enormous volume to one small area. Routing it into a designed drain run rather than onto the lawn beside the foundation removes that load completely. How long does a French drain last? expand\_more A properly built run with clear stone, filter cloth, and correct fall lasts decades. Catch basin baskets need clearing seasonally, which is a five minute job. Do I need a permit for a French drain in Toronto? expand\_more Yard drainage generally does not require a building permit, but connecting to a municipal storm service does require approval, and excavation near the property line has setback considerations. We confirm what applies to your lot before work starts. Can a French drain be installed in winter? expand\_more Once the ground freezes, trenching becomes impractical and expensive. We schedule drainage work between April and November, and if a basement is actively flooding in January we mitigate and install interior drainage, then revisit the yard in spring. Can I install a French drain myself? expand\_more A short, shallow run on a simple lot is a manageable DIY project if you request utility locates through Ontario One Call first, use clear washed stone and non-woven geotextile fabric, and confirm continuous fall to a legal outlet with a level. Most failed drains we are called to replace were built with pea gravel and no measured fall. Runs that tie in downspouts, sit near the property line, or need a storm connection or dry well are worth having designed. Do you install French drains outside the City of Toronto? expand\_more Yes. Foundation Waterproofing Toronto installs French drains and yard drainage across North York, Etobicoke, Scarborough, Vaughan, Mississauga, Brampton, Markham, Richmond Hill, and Oakville, as well as the Toronto core. The free in-home inspection and published per-foot pricing are the same in every area. ### Still have a question about your basement Book a free in-home inspection and we will answer it in writing, with the scope and the CAD price on the same page. Book Free In-Home Inspection [/contact/ →](/contact/) ## Related Services Wet basements rarely have a single cause. These services are the ones most often scoped alongside this work on Toronto homes. construction ### Exterior Weeping Tile Toronto Exterior weeping tile replacement: footing-level excavation, Delta-MS drainage board, and membrane to control water at the source. View details arrow\_forward [Exterior Weeping Tile Toronto →](/exterior-weeping-tile-toronto/) window ### Window Well Drainage Toronto Window well drainage across Toronto and the GTA: vertical gravity drain tied to the foundation weeping tile, clear drainage gravel, window well installation and polycarbonate safety covers, plus grading and downspout diversion around the well to stop basement window leaks. View details arrow\_forward [Window Well Drainage Toronto →](/window-well-drainage-toronto/) water\_damage ### Basement Waterproofing Toronto Interior and exterior basement waterproofing in Toronto and the GTA for homes with hydrostatic pressure, efflorescence, or spring-thaw seepage, with a free inspection and published CAD pricing. View details arrow\_forward [Basement Waterproofing Toronto →](/basement-waterproofing-toronto/) ![](/images/misc/two-crew-members-checking-the-fall-on-a-completed-.webp) Same-Day GTA Emergency Response ## Get a written french drain installation diagnostic for your Toronto home Book the free in-home inspection and we confirm the water source, the scope, and the CAD price in writing before anyone picks up a tool. calendar\_month Book Free In-Home Inspection [/contact/ →](/contact/) call Call (647) 254-5110 [tel:+16472545110 →](tel:+16472545110) - check\_circle Free in-home inspection with a written diagnostic - check\_circle Published CAD pricing before any work starts - check\_circle OBC Part 9 compliant, WSIB registered, $2M insured