Skip to content
ContractorsRanked

Best Plumbers in Cornwall, ON (2026)

22 plumbers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Cornwall: Walker ClimateCare, CR Score 89/100; 4.8★ from 1,508 Google reviews; open 24/7.

  2. 3

    Best for emergencies (open 24/7): AMS Plumbing and HVAC, posts 24/7 hours; ranked #3 of 22.

  3. 2

    Most-reviewed: The Water Heater Guy, 120 Google reviews at 5.0★, the most of 22 ranked after Walker ClimateCare; ranked #2.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

22 Cornwall plumbers are ranked here by CR Score, from 8 published factors. 4 are open 24/7, 8 open Saturdays and 7 open Sundays, based on posted hours. The median Google rating is 4.8★ across 22 rated businesses.

Top 10 plumbers in Cornwall at a glance

Top 10 plumbers in Cornwall at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Walker ClimateCare894.8★ (1,508)Cornwall24/7Overall
2The Water Heater Guy895.0★ (120)CornwallSat · SunMost reviews
3AMS Plumbing and HVAC854.8★ (39)Massena, 16 km away24/7Emergencies
4Little Digger835.0★ (22)CornwallSat · Sun—
5Superior Plumbing & Heating of Cornwall834.3★ (74)Cornwall24/7—
6Iron Fort Construction & Renovation804.3★ (59)Cornwall24/7—
7Legault Plumbing805.0★ (4)CornwallSat · Sun—
8Image Renovations Cornwall795.0★ (8)CornwallSat—
9Aurele St-Jean Plumbing774.6★ (54)Cornwall——
10E W Pryer Plumbing Ltd775.0★ (17)Cornwall——

The 22 best plumbers in Cornwall, ranked

Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.

  1. Ranked #1 in Cornwall

    #1 Walker ClimateCare

    Based in Cornwall

    89/100CR Score

    Ranked #1 because of its Google rating and review volume: 4.8★ from 1,508 Google reviews, the most Google reviews on this list (1,508).

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.8★ from 1,508 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1714 Vincent Massey Dr, Cornwall, ON K6H 5R6
    View profile for Walker ClimateCare(613) 416-7233

  2. #2 The Water Heater Guy

    Based in Cornwall

    89/100CR Score

    Ranked #2 because of its Google rating and trade focus: 5.0★ from 120 Google reviews, listed on Google as “Plumber”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 5.0★ from 120 Google reviews
    Hours
    Mon–Sun 8 AM–5 PM
    Address
    6286 County Rd 27, Summerstown, ON K0C 2E0
    View profile for The Water Heater Guy(613) 362-7466

  4. #4 Little Digger

    Based in Cornwall

    83/100CR Score

    Ranked #4 because of its Google rating and trade focus: 5.0★ from 22 Google reviews, listed on Google as “Plumber”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 5.0★ from 22 Google reviews
    Hours
    Mon–Sun 8 AM–6 PM
    Address
    301 Balmoral Ave, Cornwall, ON K6H 3G6
    View profile for Little Digger(613) 870-0390

  7. #7 Legault Plumbing

    Based in Cornwall

    80/100CR Score

    Ranked #7 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Plumber”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 5.0★ from 4 Google reviews
    Hours
    Mon–Sun 7 AM–5 PM
    View profile for Legault Plumbing(613) 362-8287

  9. #9 Aurele St-Jean Plumbing

    Based in Cornwall

    77/100CR Score

    Ranked #9 because of its Google rating and trade focus: 4.6★ from 54 Google reviews, listed on Google as “Plumber”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.6★ from 54 Google reviews
    Hours
    Mon–Thu 8 AM–5 PM · Fri 8 AM–4 PM · Sat–Sun closed
    Address
    1005 Tenth St E #3, Cornwall, ON K6H 7S3
    View profile for Aurele St-Jean Plumbing(613) 932-3434

  10. #10 E W Pryer Plumbing Ltd

    Based in Cornwall

    77/100CR Score

    Ranked #10 because of its Google rating and trade focus: 5.0★ from 17 Google reviews, listed on Google as “Plumber”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 5.0★ from 17 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun closed
    Address
    5701 Richmond Dr, Long Sault, ON K0C 1P0
    View profile for E W Pryer Plumbing Ltd(613) 360-2483

  11. #11 Lupien Jean Plumbing

    Based in Cornwall

    75/100CR Score

    Ranked #11 because of its Google rating and trade focus: 4.8★ from 17 Google reviews, listed on Google as “Plumber”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.8★ from 17 Google reviews
    Hours
    Mon–Fri 7:30 AM–5 PM · Sat–Sun closed
    Address
    1752 Brookdale Ave, Cornwall, ON K6J 4R3
    View profile for Lupien Jean Plumbing(613) 938-5700

  12. #12 Cotnam Plumbing Inc.

    Based in Cornwall

    75/100CR Score

    Ranked #12 because of its Google rating and trade focus: 5.0★ from 8 Google reviews, listed on Google as “Plumber”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 5.0★ from 8 Google reviews
    Hours
    Mon–Fri 8 AM–4 PM · Sat–Sun closed
    Address
    17508 Headline Rd, Long Sault, ON K6H 7V4
    View profile for Cotnam Plumbing Inc.(613) 930-3523

  15. #15 Casey Mechanical Inc

    Based in Cornwall

    73/100CR Score

    Ranked #15 because of its Google rating and review volume: 4.9★ from 111 Google reviews, 111 Google reviews.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.9★ from 111 Google reviews
    Hours
    Mon–Thu 8 AM–4 PM · Fri 8 AM–1 PM · Sat–Sun closed
    Address
    920 Carleton St, Cornwall, ON K6H 6B9
    View profile for Casey Mechanical Inc(613) 938-1210

  16. #16 EverFlow Plumbing Inc

    Based in Cornwall

    73/100CR Score

    Ranked #16 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Plumber”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 5.0★ from 5 Google reviews
    Hours
    Mon–Fri 7 AM–5 PM · Sat–Sun closed
    View profile for EverFlow Plumbing Inc(888) 539-3569

  19. #19 Noble

    Based in Cornwall

    71/100CR Score

    Ranked #19 because of its Google rating and review volume: 4.7★ from 38 Google reviews, 38 Google reviews.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.7★ from 38 Google reviews
    Hours
    Mon–Fri 7 AM–5 PM · Sat–Sun closed
    Address
    2905 Copeland St, Cornwall, ON K6H 6L8
    View profile for Noble(613) 933-5600

  21. #21 Marleau HVAC Services Ltd

    Based in Cornwall

    67/100CR Score

    Ranked #21 because of its Google rating and trade focus: 4.2★ from 5 Google reviews, listed on Google as “Air conditioning contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.2★ from 5 Google reviews
    Hours
    Mon–Fri 8 AM–4 PM · Sat–Sun closed
    Address
    18077 Tyotown Rd, South Glengarry, ON K6H 7S7
    View profile for Marleau HVAC Services Ltd(613) 932-7548

Also serving Cornwall

17 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.

Unranked plumbers serving Cornwall
BusinessGoogle ratingDistance
ACE Plumbing & Heating4.0★ (1)In Cornwall
Bradford Plumbing & Heating39 km
Cornwall Sewer Inspection1.0★ (1)In Cornwall
Crack Pro Foundation Repair4.7★ (39)In Cornwall
Drain Service & PlumbingIn Cornwall
E V Grandmaison3.0★ (1)In Cornwall
Gates PlumbingIn Cornwall
Kimble Excavation (formally Orval Kimble Excavating)5.0★ (1)17 km
Laperriere MechanicalIn Cornwall
Lapierre Plumbing & HeatingIn Cornwall
Marc Viau Mechanical4.4★ (25)In Cornwall
Oscar Ladouceur & Son Ltd5.0★ (3)In Cornwall
Rj Rowell Plumbing & Heating11 km
Superior Plumbing & Heating3.0★ (1)16 km
The House of Fine Design Inc.In Cornwall
The Water Heater Guy5.0★ (2)In Cornwall
Upstate Heating & Plumbing40 km

How much do plumbers cost in Cornwall?

US national ranges converted to CAD, not adjusted for Cornwall. Each row names its basis and the month we checked it.

How much do plumbers cost in Cornwall?
JobLowTypicalHighBasisChecked
Water heater replacementCA$1,240CA$1,890CA$2,570Per 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

How we ranked Cornwall plumbers

We scored 22 Cornwall 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Cornwall data
Reputation35%Bayesian-adjusted Google star ratingMeasured
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2Not yet collected
Review volume10%log10(reviews + 1) against the list maximumMeasured
Recency10%Share of reviews from the last 12 monthsNot yet collected
Availability10%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5Measured
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radiusMeasured
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)Measured

Plumbers in Cornwall: frequently asked questions

Who is the best plumber in Cornwall?

By CR Score, the highest-ranked plumber in Cornwall, ON is Walker ClimateCare with a CR Score of 89/100. It has 4.8★ from 1,508 Google reviews. It is open 24/7. The Water Heater Guy (#2) and AMS Plumbing and HVAC (#3) follow. We ranked 22 plumbers on 8 factors, last updated October 22, 2026.

How many plumbers are there in Cornwall?

ContractorsRanked ranks 22 plumbers serving Cornwall, ON. 17 of them are based in Cornwall; the rest serve it from nearby towns. Another 17 within 40 km are listed but not ranked yet. Counts are as of October 2026.

Which plumbers in Cornwall are open 24/7?

4 ranked plumbers in Cornwall post 24/7 hours. The highest-ranked are Walker ClimateCare (#1), AMS Plumbing and HVAC (#3) and Superior Plumbing & Heating of Cornwall (#5). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which plumbers in Cornwall work on weekends?

8 of 22 ranked plumbers post Saturday hours and 7 post Sunday hours. The highest-ranked open Saturdays are Walker ClimateCare (#1), The Water Heater Guy (#2) and AMS Plumbing and HVAC (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does water heater replacement cost in Cornwall?

Water heater replacement typically costs CA$1,240 to CA$2,570, with CA$1,890 typical (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)). This is a national range, not adjusted for Cornwall. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Cornwall plumbers have?

The median Google rating among 22 rated plumbers in Cornwall is 4.8★, with a median of 18 reviews. Walker ClimateCare has the most, 1,508 reviews, and ranks #1. We adjust ratings for review count, so a few five-star reviews cannot top the list.

How does ContractorsRanked rank plumbers?

Each plumber gets a 0–100 CR Score from 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.

Do plumbers outside Cornwall count in this ranking?

Yes, if they are within 40 km of the Cornwall city centre, our service radius for plumbers. Each listing shows where the business is based and how far away it is. Proximity is 5% of the CR Score, so a nearby business gets a small edge.

Update log for Cornwall

  1. October 2026: CR Scores recalculated for 22 plumbers serving Cornwall.
  2. October 2026: 1 duplicate listing merged.

More plumbers and Cornwall pages