Skip to content
WaterproofingIndex

Basement waterproofing and drainage in Oshawa

Last updated: By Below-Grade Records Desk

8 below-grade contractors are listed within 5 km of Oshawa, compiled August 2026.

average Google rating 4.9★ · borough / region: Durham · deepest category: Sump Pumps & Backwater Valves (4 listed) · ordered on Google review data, not paid placement

Coverage

Which sump pump and backwater valve installers are listed for Oshawa?

See all 4

4 sump pump and backwater valve installers are listed for Oshawa, averaging 4.9★ over 1,563 Google reviews. Oshawa Plumbing holds the top position at 5★ from 65 reviews. Order comes from review data and record completeness, never payment.

Coverage

Which basement waterproofing contractors are listed for Oshawa?

2 basement waterproofing contractors are listed for Oshawa, averaging 4.7★ over 213 Google reviews. Call the Plumbing Doctor holds the top position at 4.8★ from 193 reviews. Order comes from review data and record completeness, never payment.

Coverage

Which weeping tile and drainage contractors are listed for Oshawa?

1 weeping tile and drainage contractors are listed for Oshawa, averaging 4.8★ over 35 Google reviews. Caldwell Plumbing Oshawa holds the top position at 4.8★ from 35 reviews. Order comes from review data and record completeness, never payment.

Coverage

Which below-grade services are covered in Oshawa?

One row per category WaterproofingIndex covers in Oshawa: how many companies are listed, what they average on Google, and the GTA price range published for that service. The ranked list for each one follows underneath.

WaterproofingIndex dataset, August 2026. Ratings from public Google reviews.
CategoryListed prosAvg Google rating
Sump Pumps & Backwater Valves44.9★
Basement Waterproofing24.7★
Weeping Tile & Drainage14.8★

Coverage

Why are some companies missing from this page?

38 of the 384 companies here publish no street address, only a Google service-area centroid, and 4 of them share one such point. That is not an address, so none of them is placed in Oshawa. Find them in the A-Z index, and ask which areas they cover.

Coverage

Which areas next door are covered?

Below-grade crews work across boundaries, and a company two neighbourhoods away is often on the same street the following week. These Greater Toronto Area areas next to Oshawa have their own lists.

Waterproofing in Oshawa: frequently asked questions

Who works on wet basements in Oshawa?

WaterproofingIndex's August 2026 dataset holds 8 below-grade contractors covering Oshawa, at an average Google rating of 4.9★. Sump Pumps & Backwater Valves is the deepest category here, with 4 listed. Get three itemised quotes before you commit to any of them.

Which below-grade service scores highest in Oshawa?

Sump Pumps & Backwater Valves leads on rating: 4.9★ across 4 rated companies, ahead of every other category WaterproofingIndex covers in this area. The stars come from Google reviewers, and our order weighs how many of them there were.

What should a Oshawa homeowner expect to pay for sump pump and backwater valve work?

Tornado Plumbing & Drains (Toronto) publishes $1,400 to $2,400 per installed system for primary sump pump installed in an existing pit across the GTA, before 13% HST. Depth and access are what move a Oshawa quote inside that range. The sump pumps & backwater valves cost guide on WaterproofingIndex breaks out every line item with its source.