Drainage Service in Markham

Drainage work covers grading and regrading a lot so water moves away from the foundation, installing or replacing weeping tile, adding catch basins and downspout extensions, fixing window well drains, and tying into municipal storm sewers where needed. In Markham, where clay-heavy soil and older subdivisions with flat lot grading are common, a lot of the calls contractors get are for wet basements, ponding water in the backyard, or a driveway that sheets water toward the garage instead of away from it. Some jobs are small (extending a downspout, adding a splash pad), others involve excavation around the whole foundation to install new membrane and drainage tile.

When you're comparing the 6 businesses listed in this category, ask whether they diagnose the source of the water before quoting a fix. A contractor who shows up, looks at the grading, checks where downspouts discharge, and maybe runs a camera through existing drain tile is doing this properly. One who just quotes "we'll dig it up and replace it" without looking at the actual water path is guessing. Also ask about permits for any work tying into the municipal system, and whether they warranty the work against future backups.

Our scoring weighs things like how clearly a company explains its process, how it handles warranty and follow-up calls, and what past customers say about whether the problem actually went away. See the full breakdown of how we score and rank contractors on our methodology page, or jump straight to the ranked guide to Markham renovation contractors for the complete list across all trades.