226 plumbers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Oshawa: Vaillancourt Plumbing & Drains, CR Score 66/100; 4.9★ from 1,375 Google reviews; open 24/7.
Best for emergencies (open 24/7): Reliance Heating, Air Conditioning & Plumbing, posts 24/7 hours; ranked #2 of 226.
Most-reviewed: Enercare, 8,942 Google reviews at 4.9★, the most of 226 ranked; ranked #11.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
226 Oshawa plumbers are ranked here by CR Score, from ten published factors. 134 are open 24/7, 176 open Saturdays and 152 open Sundays, based on posted hours. The median Google rating is 4.9★ across 226 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Vaillancourt Plumbing & Drains | 66 | 4.9★ (1,375) | Oshawa | 24/7 | Overall |
| 2 | Reliance Heating, Air Conditioning & Plumbing | 63 | 4.8★ (6,966) | Oshawa | 24/7 | Emergencies |
| 3 | PR Plumbing | 63 | 4.8★ (401) | Oshawa | 24/7 | — |
| 4 | Sewer Squad Plumbing | 63 | 4.9★ (1,700) | Ajax, 17 km away | 24/7 | — |
| 5 | 2 Bro's Plumbing | 63 | 4.9★ (393) | Ajax, 5 km away | 24/7 | — |
| 6 | Fast Lane Plumbing | 63 | 4.9★ (195) | Oshawa | 24/7 | — |
| 7 | Precision Plumbing & Drain Service | 62 | 4.9★ (134) | Oshawa | 24/7 | — |
| 8 | DSM Plumbing & Water Systems | 62 | 4.9★ (409) | Oshawa | Sat · Sun · Evenings | — |
| 9 | Call the Plumbing Doctor Inc. & Call the Foundation Doctor Inc. | 62 | 4.8★ (182) | Oshawa | 24/7 | — |
| 10 | Forward Mechanical Plumbing and Gas | 62 | 4.9★ (111) | Oshawa | 24/7 | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and trade focus: 4.9★ from 1,375 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #2 because of its Google rating and review volume: 4.8★ from 6,966 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #3 because of its Google rating and trade focus: 4.8★ from 401 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ajax, 17 km away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 1,700 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ajax, 5 km away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 393 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #6 because of its Google rating and trade focus: 4.9★ from 195 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #7 because of its Google rating and trade focus: 4.9★ from 134 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #8 because of its Google rating and trade focus: 4.9★ from 409 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #9 because of its Google rating and trade focus: 4.8★ from 182 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #10 because of its Google rating and trade focus: 4.9★ from 111 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #11 because of its Google rating and review volume: 4.9★ from 8,942 Google reviews, the most in Oshawa.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #12 because of its Google rating and trade focus: 4.9★ from 98 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #13 because of its Google rating and trade focus: 4.8★ from 114 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ajax, 5 km away
Ranked #14 because of its Google rating and trade focus: 4.8★ from 181 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #15 because of its Google rating and trade focus: 5.0★ from 50 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #16 because of its Google rating and trade focus: 5.0★ from 43 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #17 because of its Google rating and trade focus: 5.0★ from 44 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ajax, 11 km away
Ranked #18 because of its Google rating and trade focus: 4.7★ from 333 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #19 because of its Google rating and trade focus: 5.0★ from 35 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #20 because of its Google rating and trade focus: 4.8★ from 34 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #21 because of its Google rating and trade focus: 4.8★ from 30 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #22 because of its Google rating and trade focus: 5.0★ from 112 Google reviews, listed on Google as “Plumber”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Oshawa
Ranked #23 because of its Google rating and trade focus: 4.3★ from 147 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #24 because of its Google rating and trade focus: 5.0★ from 16 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
Ranked #25 because of its Google rating and trade focus: 5.0★ from 16 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 226 ranked plumbers here; the rest are on their profiles.
20 more plumbers within 40 km that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| A-Pex Plumbing & Heating | 5.0★ (1) | In Oshawa |
| CDN Plumbing | 5.0★ (2) | In Oshawa |
| Drain King Plumbers Oshawa-Whitby | 5.0★ (4) | In Oshawa |
| Electric Water Heater Svc | In Oshawa | |
| Everest Drain & Plumbing: Oshawa's Local Plumber | 5.0★ (2) | In Oshawa |
| Fix Plumbing | 4.9★ (73) | 15 km |
| Flow Right Plumbing | In Oshawa | |
| Goodman W D Plumbing Limited | 5.0★ (1) | In Oshawa |
| King Street Plumbing Services Inc. | 5.0★ (1) | In Oshawa |
| Latcham Plumbing ltd. | 5.0★ (2) | In Oshawa |
| Lundy Plumbing & Heating | 5.0★ (2) | In Oshawa |
| MAAS Trust Concrete Inc | Construction Company in Whitby & Mississauga | Licensed Master Electrician & Plumber | 5.0★ (2) | In Oshawa |
| Markhoor Homes | 5.0★ (1) | In Oshawa |
| Mr. Rooter Plumbing of Scarborough ON | 4.7★ (479) | 34 km |
| New Solutions Concrete And Drain In | In Oshawa | |
| Orbit Mechanical | In Oshawa | |
| Peter F Goodman Plumbing Ltd | In Oshawa | |
| Phil's Contracting / Building & Renovations | 3.0★ (2) | In Oshawa |
| Stacks Heating and Air | 4.8★ (138) | In Oshawa |
| Wrench it Up Plumbing | 4.8★ (356) | 36 km |
US national ranges converted to CAD, not adjusted for Oshawa. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Water heater replacement | CA$1,240 | CA$1,890 | CA$2,570 | Per unit, installed (unit plus labor); typical range of customer-reported jobs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
We scored 226 Oshawa plumbers on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Oshawa data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |