132 plumbers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Dorchester: Mr. Rooter Plumbing of London ON, CR Score 90/100; 4.8★ from 2,083 Google reviews; open 24/7.
Best for emergencies (open 24/7): Reliance London Heating, Air Conditioning & Plumbing, posts 24/7 hours; ranked #2 of 132.
Most-reviewed: Reliance London Heating, Air Conditioning & Plumbing, 12,217 Google reviews at 4.8★, the most of 132 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
132 Dorchester plumbers are ranked here by CR Score, from 8 published factors. 52 are open 24/7, 69 open Saturdays and 60 open Sundays, based on posted hours. The median Google rating is 4.8★ across 132 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Mr. Rooter Plumbing of London ON | 90 | 4.8★ (2,083) | London, 18 km away | 24/7 | Overall |
| 2 | Reliance London Heating, Air Conditioning & Plumbing | 90 | 4.8★ (12,217) | London, 10 km away | 24/7 | Emergencies, Most reviews |
| 3 | Freeman Mechanical | 89 | 4.9★ (358) | Ingersoll, 16 km away | 24/7 | — |
| 4 | Nas Plumbing Inc. | 89 | 5.0★ (89) | Kitchener, 7 km away | 24/7 | — |
| 5 | Steve Young Plumbing & Heating Ltd | 88 | 4.8★ (83) | Dorchester | 24/7 | — |
| 6 | Elgin County Plumbing | 88 | 5.0★ (301) | St. Thomas, 23 km away | 24/7 | — |
| 7 | London Plumbing | 88 | 4.8★ (332) | London, 16 km away | 24/7 | — |
| 8 | DrainTech Plumbing London | 87 | 4.9★ (56) | London, 7 km away | 24/7 | — |
| 9 | Whittaker Water Plumbing | 87 | 5.0★ (67) | Norfolk County, 11 km away | 24/7 | — |
| 10 | Jumbo Plumbing | 87 | 4.9★ (318) | London, 25 km away | 24/7 | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and availability: 4.8★ from 2,083 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 10 km away
Ranked #2 because of its Google rating and review volume: 4.8★ from 12,217 Google reviews, the most Google reviews on this list (12,217).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Ingersoll, 16 km away
Ranked #3 because of its Google rating and availability: 4.9★ from 358 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Kitchener, 7 km away
Ranked #4 because of its Google rating and availability: 5.0★ from 89 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Dorchester
Ranked #5 because of its Google rating and availability: 4.8★ from 83 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Thomas, 23 km away
Ranked #6 because of its Google rating and availability: 5.0★ from 301 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 16 km away
Ranked #7 because of its Google rating and availability: 4.8★ from 332 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 7 km away
Ranked #8 because of its Google rating and availability: 4.9★ from 56 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Norfolk County, 11 km away
Ranked #9 because of its Google rating and availability: 5.0★ from 67 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 25 km away
Ranked #10 because of its Google rating and availability: 4.9★ from 318 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 26 km away
Ranked #11 because of its Google rating and availability: 4.9★ from 329 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 18 km away
Ranked #12 because of its Google rating and availability: 5.0★ from 59 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 14 km away
Ranked #13 because of its Google rating and availability: 5.0★ from 35 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Thomas, 8 km away
Ranked #14 because of its Google rating and availability: 5.0★ from 42 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 4 km away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 82 Google reviews, listed on Google as “Plumber”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in London, 18 km away
Ranked #16 because of its Google rating and availability: 4.8★ from 85 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 14 km away
Ranked #17 because of its Google rating and availability: 4.6★ from 132 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Thomas, 25 km away
Ranked #18 because of its Google rating and availability: 5.0★ from 78 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Ingersoll, 16 km away
Ranked #19 because of its Google rating and availability: 5.0★ from 28 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 4 km away
Ranked #20 because of its Google rating and availability: 4.6★ from 11 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 11 km away
Ranked #21 because of its Google rating and availability: 4.6★ from 34 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Thomas, 28 km away
Ranked #22 because of its Google rating and availability: 4.9★ from 78 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Norfolk County, 16 km away
Ranked #23 because of its Google rating and availability: 5.0★ from 18 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 14 km away
Ranked #24 because of its Google rating and availability: 4.8★ from 271 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 15 km away
Ranked #25 because of its Google rating and availability: 5.0★ from 28 Google reviews, open 24/7.
Based on 6 of 8 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 132 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 |
|---|---|---|
| Crozier Plumbing of London | 5.0★ (2) | 15 km |
| D & S Plumbing | 4.1★ (36) | 23 km |
| d5 Excavating | 5.0★ (2) | 31 km |
| Drains R Us Plumbing | 5.0★ (1) | 30 km |
| DrainTech Plumbing | 5.0★ (1) | 10 km |
| Duke Maintenance | 5.0★ (2) | 12 km |
| Farrington Plumbing & Heating | 3.0★ (2) | 31 km |
| H+S Plumbing Inc. | 5.0★ (3) | 38 km |
| Jons Pumps & Plumbing | 5.0★ (1) | 33 km |
| Larry's Asphalt Paving Co Ltd | 5.0★ (1) | 13 km |
| MBH Mechanical | 5.0★ (1) | 16 km |
| Mech Tech Marketing Inc | 5.0★ (1) | 14 km |
| Mels Plumbing Inc | 4.9★ (23) | 28 km |
| Metro Boiler Inc. | 5.0★ (1) | 33 km |
| PMD Excavation Construction | 5.0★ (46) | 24 km |
| Premium One Plumbing | 5.0★ (2) | 26 km |
| Sanitary Sewer Cleaning | 5.0★ (2) | 16 km |
| Scott's Home Works | 5.0★ (1) | 28 km |
| The Plumber | 5.0★ (2) | 23 km |
| XR EXCAVATING INC | 5.0★ (2) | 31 km |
US national ranges converted to CAD, not adjusted for Dorchester. 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 132 Dorchester plumbers on 8 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. Unknown factors are left out of the score, 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 Dorchester data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |