Owner-led every site visit since 2009. See our Ottawa work →
Drainage work in Ottawa ranges from $400 for a downspout redirect or surface regrade to $10,000+ for a full property drainage system. The right scope depends on the cause: clogged downspouts, lot grade, broken weeping tile, or a missing French drain.
Three scope levels. Final quote after a free on-site visit.
$400-$1,200
$1,200-$4,000
$4,000-$10,000+
For detailed examples, see our drainage price list or try our interlock cost calculator. Drainage work is done by the same Interlock Experts crew that builds the interlock on top of it.
Our Ottawa drainage process starts with an on-site grade and water-flow assessment. We map where the water is coming from (downspouts, lot grade, neighbour grading, hidden seepage), identify the cheapest fix that actually solves it, and quote scope-based — no upselling you to a French drain when a downspout extension would do the job.
Downspouts, lot grade, neighbour grading or a broken weeping tile. We trace the source on the site visit and quote the cheapest fix that actually solves it.
Same family-owned crew runs every project. Headcount stays at 11 so the lead installer is on-site 80% of every install.
Local crew that knows Ottawa soils, frost line, and municipal requirements. Quick callbacks if anything ever needs attention.
Same-day reply on phone and email every business day. The other 14 took 48.
Spot fixes from $400 and weeping tile at $25 per linear foot, plus HST. No French drain when a downspout extension does the job.
Both certificates available before any project starts.
Takes 30 seconds.
About 20 minutes, no obligation.
Itemized. No surprises.
No pressure, no follow-up calls.
You do not lift a finger.
We work around your schedule.
Plywood paths, drop cloths, careful crew.
Full sweep, every day.
Still have questions? Browse the FAQ section below ↓
Reliable crew, hardworking and very efficient. Highly recommend them
The team was very reliable. I loved working with them. I would highly recommend them again.
Great attention to details, did an amazing job on my properties. Thank you.
Ottawa, ON, May 2025. Existing porch interlock stones…
Ottawa, ON
View project
About 55 linear feet of tan block retaining wall capped…
Stittsville, Ottawa
View projectRecent job: Faircrest Heights, June 2024. Persistent pooling along the side of the house. 22 ft French drain installed with gravel bed and discharge to lawn. $2,400 total. 2 days on-site. Two seasons of dry foundation since.
Pooling water is the symptom. The cause might be a downspout 30 feet away, a settled neighbour grade, or a broken weeping tile. We diagnose first, quote the cheapest fix that actually solves it, and skip the upsell.
Kanata. Drainage solutions across Kanata Lakes, Bridlewood, and Morgan's Grant. Clay soils mean slow surface drainage — French drains and proper regrading solve most Kanata water problems.
Barrhaven. Builder-grade drainage often leaves water pooling in side yards across Half Moon Bay, Stonebridge, and Longfields. Downspout extensions and surface regrading are common fixes.
Orleans. Drainage work across Avalon, Fallingbrook, and Chapel Hill. Older Orleans homes often need weeping tile repair plus exterior grading.
Nepean. Drainage across Centrepointe, Tanglewood, and Crestview. Mature tree roots disrupt natural drainage paths — we route around root systems with French drains.
Stittsville. Rural-edge drainage for Jackson Trails and Crossing Bridge Estates. Septic and well placement awareness is part of the work.
Gloucester. Drainage solutions across Beacon Hill, Blackburn Hamlet, and Hunt Club. Salt-route exposure means proper discharge routing matters more here.
Manotick. Estate drainage across Mahogany, Manotick Estates, and Long Island. Larger lots and Rideau-adjacent properties need bigger systems — typical full-system $6,000-$12,000.
Riverside South. Builder-grade drainage often needs help on Honey Gables and Quinn's Pointe new builds. Side-yard regrading and downspout extension are the common fixes.
Centretown. Tight-lot drainage across the Golden Triangle and Sandy Hill. Heritage downpours and shared property lines — solutions need to be precise and neighbour-aware.
Westboro. Heritage home drainage across Westboro Beach and Highland Park. Older weeping tile often needs repair or replacement during foundation work.
Alta Vista. Drainage across Pleasant Park, Faircrest Heights, and Hawthorne Meadows. Mature trees and natural slopes are the recurring drainage issues.
The Glebe. Heritage drainage solutions across Lansdowne, Patterson Creek, and Brown's Inlet. Tight lots and original century-home drainage often need a full rebuild.
Spot fixes (downspout redirects, single regrade): $400-$1,200. Section drainage with French drain or weeping tile: $1,200-$4,000. Full property drainage systems: $4,000-$10,000+. Final quote after on-site assessment.
Signs include pooling water 24+ hours after rain, settled pavers near downspouts, dark soil near the foundation, mossy grass strips, basement seepage, or interlock that keeps sinking in the same spots.
No. About 30% of drainage problems are actually downspout-routing issues — a French drain would be overkill. We diagnose before quoting so you do not pay for more than the problem requires.
Yes. We can install surface channels and trench drains into existing interlock without a full rebuild. Below-grade French drains usually require lifting a section of pavers.
Most exterior drainage work does not. Connections to municipal storm sewers do. We confirm with the City of Ottawa during the on-site visit.
Spot fixes: 1 day. Section drainage: 2-3 days. Full system: 4-5+ days. Weather-sensitive — heavy rain can pause work.
Yes. We routinely combine drainage rework with interlock driveway, patio, and walkway installs. Coordinated trenching means lower total cost.
We handle the exterior side: weeping tile, grading, downspout routing. Interior basement waterproofing is a separate trade and we will refer you if that is what is needed.
Yes. We provide drainage solutions across Ottawa including Kanata, Barrhaven, Orleans, Nepean, Stittsville, Gloucester, Manotick, Riverside South, Centretown, Westboro, Alta Vista, and The Glebe.
Porch interlock removed for base regrade
Compacted base ready for re-lay
Reinstalled interlock with polymeric sand joints
Tan block retaining wall with charcoal caps
Step-pyramid landing in tan split-face block
Interlock repair in Ottawa — sunken pavers, lifting joints, settled driveway and patio repair. Releveling, resanding, paver replacement, polymeric sand. Written quote in 24 hours.
Learn more
Retaining wall repair in Ottawa from $400 for spot repairs, rebuilds from $30/sq ft plus HST. Re-set leaning walls, rebuild bulged sections, fix drainage and base. Written quote in 24 hours.
Learn more
Interlock driveways in Ottawa from $18/sq ft plus HST. Frost-proof base, Techo-Bloc, Permacon & Unilock pavers, polymeric sand. Written quote in 24 hours.
Learn more
Interlock patios in Ottawa — backyard patios, fire pit areas, seating walls. Premium pavers, proper drainage. Written quote in 24 hours.
Learn more