Standing water on a parking lot after a storm

After rain, water standing on a lot is a drainage problem before it is an asphalt problem. Seven of the 376 companies in this index fall under site drainage, the category with the smallest number of entries among its nine categories. Public municipal records contain the price: the City of Toronto's own cost estimate puts a fully installed catch basin at $6,800.

Among the 376 companies in the index, 7 are listed under the site drainage category. No other category on the site comes close to having so few entries. Excavation and grading accounts for 66 companies, parking lot paving for 92, asphalt paving for 181, and even concrete curbs and sidewalks, the specialist category with the next smallest number, accounts for 10. A property manager searching for a paving contractor in the GTA will find hundreds of records to sort through. A property manager searching for drainage work will find seven.

That gap should be read carefully, not as a shortage. Categories on this site come from what each company advertises, and crews that handle drainage on commercial lots often classify themselves under paving or excavation. Four of the seven drainage records also list parking lot paving, and two of the remaining three list asphalt repair and line marking together. Only one of the seven lists site drainage as its only category. The specialism mostly appears within broader businesses, so the standalone count stays low.

The seven are widely dispersed. They appear in Burlington, Thornhill, Forest Hill, Islington-City Centre West, Whitby and Willowdale, which has two of them. No cluster exists, which differs from the index overall, where Vaughan alone contains 32 companies and Islington-City Centre West contains 27.

Review totals across the seven span from 1 to 12. All seven have ratings of 4.9 or higher, which seems conclusive but is not, because a rating drawn from two or three reviews tells you almost nothing. For the 352 rated companies in the index, the mean rating is 4.46 and the median review count is 15, so the drainage group falls below the site's typical sample size rather than above its typical quality. The records contain nothing specific to drainage work: no completed job data, no years in business, no equipment, no licence status. From the category, a buyer learns who to call, but not what happens after the call.

The larger group is listed one category over. Excavation and grading contains 66 companies, and reshaping a surface so water runs to a basin instead of pooling short of it is work that trade handles. If a buyer treats the drainage count as the whole available market, they are reading the wrong column, even though the seven specialists are the only records on the site where drainage is named as a service rather than merely implied.

The sequence that saves money here is to rule out the cheap answer first. POM Plumbing, based in Etobicoke and serving the GTA, advertises catch basin cleaning at $450 to $600 per basin for residential basins that are easy to access, $700 to $900 for larger or heavily clogged systems, and $1,000 to $1,800 per service visit for commercial or industrial properties with multiple basins. The last figure is quoted per visit rather than per basin, so a property with several basins already benefits by bundling them into one trip.

Whether a basin is blocked or has failed, the result is the same puddle. Their invoices are not the same. According to the catch basin cost guide, no dollar figure for structural repair, such as raising a sunken frame back to grade, appears in any of its sources separate from full replacement or routine cleaning. Therefore, the buyer must require itemization: ask any bid to state whether it covers cleaning, a component swap, or a full rebuild, because those three scopes sit at very different points on the published range.

The answer falls between two actual Ontario municipal cost estimates, which are far apart because they include different components. A fully installed catch basin, including excavation, bedding and connection, is priced at $6,800 each in the City of Toronto's preliminary cost estimate for the Broadview Avenue Extension. The Region of Peel's 2022 functional cost estimate for an arterial road in Brampton prices only the precast catch basin structure itself at $900 each; frames and grates are billed separately at $150 each.

The connecting pipe is a separate line item. The Region of Peel estimates catch basin lead pipe at $60.00 per linear metre for 150 mm PVC and $75.00 per linear metre for 250 mm PVC, so reconnecting a basin far from the storm main costs much more than reconnecting one beside it. Under the same estimate, a twin inlet catch basin structure costs $1,900 where a single low point needs double capacity, compared with $900 for the standard single-inlet 600x600 unit.

The Peel components add up to a total far below the City of Toronto's $6,800 fully installed figure; the gap is the labour and site work that Toronto includes in its number. That gap is also the single largest variable in a catch basin bid. A basin priced for a component swap and a basin priced for a full rebuild are responses to different questions, and only an itemized bid reveals which kind was received.

When water has sat for several seasons, the issue is no longer drainage. The Paving Company lists an asphalt overlay at $3 to $7 per square foot, but that price presumes the base below is structurally intact; if the granular base has failed or the subgrade has been weakened by water, the presumption does not hold. At that stage, you should recommend full-depth reconstruction, which is estimated and priced under separate criteria, and the asphalt resurfacing cost guide explains where that dividing line falls.

Reconstruction brings excavation contractors into the job, and the published figures vary widely. The Region of Peel's Brampton arterial estimate sets earth excavation at $27.50 per cubic metre, and the City of Toronto's Broadview Avenue Extension estimate sets earthworks removal and disposal at $120.00 per cubic metre. Most of that difference comes from hauling distance and site access, so planners should treat the full span as the useful range instead of either single point. The excavation and grading cost guide lists both benchmarks and the removal-scope question that goes with them.

Storm connections usually run along the property line, so drainage work often crosses it. Excavation, removal or disturbance of soil, pavement, curbing or sidewalks within the public right-of-way in Toronto requires a City of Toronto construction permit. According to the City's own Landscape Construction Permit page, the fee for the permit is $227.26 with no HST, plus restoration costs. The property owner is responsible for restoring the boulevard to the City's satisfaction afterwards.

Below that one is another layer. Under section 142(1) of the Municipal Act, 2001, Ontario municipalities can pass their own by-laws to prohibit and regulate filling, grading or excavation, as stated in the Canadian Bar Association's summary of site alteration by-laws in Ontario. One clear GTA example is the City of Burlington's Site Alteration Bylaw (By-law 064-2014), which requires a permit for any activity that alters land through filling, grading or excavation. Before a machine arrives on site, the written scope must set out which permits the contractor pulls and which the owner must obtain directly.