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Best Foundation Repair Companies in St. Thomas, ON (2026)

28 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in St. Thomas: DrainCam Plumbing, CR Score 62/100; 4.9★ from 329 Google reviews; open 24/7.

  2. 3

    Best for emergencies (open 24/7): RCC Waterproofing London, posts 24/7 hours; ranked #3 of 28.

  3. 12

    Most-reviewed: Advanced Basement Systems, 172 Google reviews at 4.9★, the most of 28 ranked after DrainCam Plumbing; ranked #12.

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

28 St. Thomas foundation repair companies are ranked here by CR Score, from ten published factors. 11 are open 24/7, 19 open Saturdays and 14 open Sundays, based on posted hours. The median Google rating is 4.8★ across 28 rated businesses.

Top 10 foundation repair companies in St. Thomas at a glance

Top 10 foundation repair companies in St. Thomas at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1DrainCam Plumbing624.9★ (329)London, 1 km away24/7Overall
2Foundation Brothers604.9★ (160)Norfolk County, 54 km awaySat · Sun · Evenings—
3RCC Waterproofing London594.5★ (20)London, 24 km away24/7Emergencies
4PMD Excavation Construction585.0★ (46)St. Thomas24/7—
5Nature's Foundation575.0★ (12)St. Thomas24/7—
6ROYAL RESTORATION EPOXY FLOORS & CONCRETE RESURFACING575.0★ (143)London, 21 km awaySat · Sun · Evenings—
7Best Plumbing and Drainage Contractors574.8★ (85)London, 18 km away24/7—
8Orange-Con564.4★ (7)St. ThomasSat · Evenings—
9Basement Waterproofing Solutions565.0★ (6)Lambton Shores, 37 km away24/7—
10Jumbo Plumbing555.0★ (35)London, 25 km away24/7—

The 28 best foundation repair companies in St. Thomas, ranked

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

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  1. Ranked #1 in St. Thomas

    #1 DrainCam Plumbing

    Based in London, 1 km away

    62/100CR Score

    Ranked #1 because of its Google rating and review volume: 4.9★ from 329 Google reviews, the most in St. Thomas.

    • 4.9★ from 329 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    85 Chester St, St Thomas, ON N5R 1V7
    View profile for DrainCam Plumbing(226) 564-3775

  2. #2 Foundation Brothers

    Based in Norfolk County, 54 km away

    60/100CR Score

    Ranked #2 because of its Google rating and trade focus: 4.9★ from 160 Google reviews, listed on Google as “Waterproofing service”.

    • 4.9★ from 160 Google reviews
    Hours
    Mon–Sun 7 AM–7 PM
    Address
    265927 Maple Dell Rd, Otterville, ON N0J 1R0
    View profile for Foundation Brothers(226) 228-4095

  8. #8 Orange-Con

    Based in St. Thomas

    56/100CR Score

    Ranked #8 because of its Google rating and trade focus: 4.4★ from 7 Google reviews, listed on Google as “Waterproofing service”.

    • 4.4★ from 7 Google reviews
    Hours
    Mon–Fri 7 AM–7 PM · Sat 7 AM–5 PM · Sun closed
    Address
    46254 New Sarum Line, St Thomas, ON N5P 3S7
    View profile for Orange-Con(519) 639-2880

  10. #10 Jumbo Plumbing

    Based in London, 25 km away

    55/100CR Score

    Ranked #10 because of its Google rating and review volume: 5.0★ from 35 Google reviews.

    • 5.0★ from 35 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    510 William St unit 3, London, ON N6B 3E6
    View profile for Jumbo Plumbing(519) 805-2623

  17. #17 DryBasements.com Ltd

    Based in Woodstock, 52 km away

    53/100CR Score

    Ranked #17 because of its Google rating and trade focus: 4.6★ from 44 Google reviews, listed on Google as “Waterproofing service”.

    • 4.6★ from 44 Google reviews
    Hours
    Mon–Fri 8 AM–4 PM · Sat–Sun closed
    Address
    139 Winniett St, Woodstock, ON N4S 5Z8
    View profile for DryBasements.com Ltd(519) 473-0561

  25. #25 RVM Trucking

    Based in Norfolk County, 56 km away

    47/100CR Score

    Ranked #25 because of its Google rating and review volume: 4.7★ from 23 Google reviews.

    • 4.7★ from 23 Google reviews
    Hours
    Mon–Sat 7 AM–5 PM · Sun closed
    Address
    793140 Hanmer Line, Norwich, ON N0J 1P0
    View profile for RVM Trucking(519) 468-2744

All 28 foundation repair companies

#1 to #25 are shown in full above. Here are #26 to #28, in CR Score order; each links to its profile.

foundation repair companies in St. Thomas, ranks 26 to 28
RankBusinessCR ScoreGoogle ratingDistance
26Mobile Mix Concrete453.1★ (9)25 km
27Co-Fo Concrete Forming Construction Ltd455.0★ (3)25 km
28A.P. Hurley Construction & Emergency Services444.3★ (8)55 km

Also serving St. Thomas

12 more foundation repair companies within 64 km that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.

Unranked foundation repair companies serving St. Thomas
BusinessGoogle ratingDistance
A1 Waterproofing13 km
Concrete St Thomas1.0★ (1)In St. Thomas
Dpa Contracting Ltd5.0★ (2)22 km
Elite Masonry Restoration4.3★ (18)In St. Thomas
Foundation Brothers5.0★ (2)38 km
Gilbert Contracting & Renovations Ltd4.7★ (13)In St. Thomas
Maxx Contracting Brick Chimney Repairs Waterproofing5.0★ (1)38 km
O'Reilly Built5.0★ (13)In St. Thomas
Ritchie's Insulation & General Contracting4.5★ (26)In St. Thomas
Rock It Contracting4.9★ (8)In St. Thomas
Stopleak Basement Waterproofing26 km
We Seal That40 km

How much do foundation repair companies cost in St. Thomas?

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

How much do foundation repair companies cost in St. Thomas?
JobLowTypicalHighBasisChecked
Foundation repairCA$3,130CA$7,270CA$11,430Per project: typical range of customer-reported repairs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026)October 2026

How we ranked St. Thomas foundation repair companies

We scored 28 St. Thomas foundation repair companies 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn St. Thomas data
Reputation25%Google star rating, adjusted for how many reviews back itMeasured
Credentials15%Active state license, bond and workers’ comp on fileNot yet collected
Review volume10%Number of Google reviews, compared with the most-reviewed business on the listMeasured
Recency5%Share of reviews from the last 12 monthsNot yet collected
Availability5%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%How clearly the business does this trade (its Google category and name)Measured
Proximity5%Based in the city scores highest, less the farther away it isMeasured
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)Measured
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodicallyMeasured
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there areMeasured

Foundation repair companies in St. Thomas: frequently asked questions

Who is the best foundation repair company in St. Thomas?

By CR Score, the highest-ranked foundation repair company in St. Thomas, ON is DrainCam Plumbing with a CR Score of 62/100. It has 4.9★ from 329 Google reviews. It is open 24/7. Foundation Brothers (#2) and RCC Waterproofing London (#3) follow. We ranked 28 foundation repair companies on ten factors, last updated October 22, 2026.

How many foundation repair companies are there in St. Thomas?

ContractorsRanked ranks 28 foundation repair companies serving St. Thomas, ON. 3 of them are based in St. Thomas; the rest serve it from nearby towns. Another 12 within 64 km are listed but not ranked yet. Counts are as of October 2026.

Which foundation repair companies in St. Thomas are open 24/7?

11 ranked foundation repair companies in St. Thomas post 24/7 hours. The highest-ranked are DrainCam Plumbing (#1), RCC Waterproofing London (#3) and PMD Excavation Construction (#4). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which foundation repair companies in St. Thomas work on weekends?

19 of 28 ranked foundation repair companies post Saturday hours and 14 post Sunday hours. The highest-ranked open Saturdays are DrainCam Plumbing (#1), Foundation Brothers (#2) and RCC Waterproofing London (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does foundation repair cost in St. Thomas?

Foundation repair typically costs CA$3,130 to CA$11,430, with CA$7,270 typical (Per project: typical range of customer-reported repairs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026)). This is a national range, not adjusted for St. Thomas. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do St. Thomas foundation repair companies have?

The median Google rating among 28 rated foundation repair companies in St. Thomas is 4.8★, with a median of 22 reviews. DrainCam Plumbing has the most, 329 reviews, and ranks #1. We adjust ratings for review count, so a few five-star reviews cannot top the list.

How does ContractorsRanked rank foundation repair companies?

Each foundation repair company gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.

Do foundation repair companies outside St. Thomas count in this ranking?

Yes, if they are within 64 km of the St. Thomas city centre, our service radius for foundation repair companies. 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 St. Thomas

  1. October 2026: CR Scores recalculated for 28 foundation repair companies serving St. Thomas.

More foundation repair companies and St. Thomas pages

Other trades in St. Thomas