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AsphaltPavingIndex

Best Site Drainage Contractors in Toronto & the GTA

Last updated: By The Pavement Desk

7 site drainage contractors across Toronto and the GTA, compiled August 2026.

41 Google reviews · median 4.98 · new catch basin, fully installed, municipal unit price typically $6,800 per catch basin (CAD), per City of Toronto · field season Apr–Nov

Ranked on the score out of 100

The 7 firms listed here score between 36 and 73, with a middle figure of 53. 5 of them publish something on their own website that this score reads, and 4 have enough stored reviews for a theme to show up.

Placement cannot be bought. How this order is calculated is set out in full, including what the score cannot tell you.

4 of the 5 rated firms here sit at exactly 5.0, on a median of 7 reviews, so depth of record separates them rather than the star.

A firm is on this page because its Google listing or its own website puts it in this trade. Whether it takes commercial and institutional work, residential driveways or both is not something AsphaltPavingIndex verifies, and a public review record leans residential even for firms whose main business is lots. Ask on the first call.

AsphaltPavingIndex lists 7 site drainage contractors across Toronto and the GTA, with a median 4.98★ Google rating over 41 reviews. New catch basin, fully installed, municipal unit price benchmarks at $6,800 per catch basin (CAD) according to City of Toronto (Broadview Avenue Extension, Municipal Class Environmental Assessment, preliminary cost estimate).

What does site drainage work cost on a commercial site in Toronto?

City of Toronto (Broadview Avenue Extension, Municipal Class Environmental Assessment, preliminary cost estimate) puts new catch basin, fully installed, municipal unit price at $6,800 per catch basin (CAD), and precast concrete catch basin structure (600x600, OPSD 705.010), supply and place only at $900 per catch basin (CAD) (Region of Peel (Arterial A2 and Coleraine Drive Functional Cost Estimate, City of Brampton, September 2022)). Those are Greater Toronto figures quoted before 13% HST, and a small scope can still land on a mobilization minimum rather than a unit rate.

All 7 site drainage line items, each with its source named

Frequently asked questions

What unit rates should a site drainage work bid show in Toronto and the GTA?

According to City of Toronto (Broadview Avenue Extension, Municipal Class Environmental Assessment, preliminary cost estimate), new catch basin, fully installed, municipal unit price runs $6,800 per catch basin (CAD), and precast concrete catch basin structure (600x600, OPSD 705.010), supply and place only runs $900 per catch basin (CAD) (Region of Peel (Arterial A2 and Coleraine Drive Functional Cost Estimate, City of Brampton, September 2022)). AsphaltPavingIndex's site drainage cost guide lists every line item with its source, and sets out which side of the property line needs a municipal permit.

Who approves drainage work on a lot in the GTA?

The municipality does, wherever the work meets its system. Rebuilding a catch basin inside the lot is private work, but a new connection to the storm sewer, or any change to how much water leaves the site and where, needs municipal approval and sometimes a stormwater review. Ponding is often a grading problem rather than a structure problem, so ask for shot elevations and a proposed drainage plan rather than a quoted count of basins, and make the bidder say what happens if the existing pipe is found collapsed.

How deep is the site drainage work bidder pool in the GTA?

7 site drainage contractors are ranked here, 5 of them with three or more Google reviews and a 4.98 star average across those.

What should you read next?

6 of the 7 site drainage contractors listed here also work in at least one other trade, most often parking lot paving (4 of them), so one tender can often cover both.