MSARCH

Best contractors in St Thomas, Ontario

MSARCH tracks 53 vetted contractors in St Thomas, Ontario, averaging 4.6★ on Google. That includes 20 electricians, 17 plumbers and 16 HVAC contractors.

The most-reviewed is G.W.B Heating & Cooling with 698 Google reviews. Every listing below is ranked by Google rating weighted for review volume.

  • 53Contractors
  • 4.6★Avg rating
  • 5,015Reviews

Updated July 2026 · Ranked by Google rating, review volume and recent-review sentiment

HVAC & Heating (16)Electricians (20)Plumbers (17)

Nearby cities

Aylmer 11London 97Ingersoll 24Tillsonburg 28Strathroy 24Woodstock 43

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How many contractors are in St Thomas?

MSARCH lists 53 HVAC, electrical and plumbing contractors in St Thomas, Ontario, with an average Google rating of 4.6 out of 5.

What is the highest-rated contractor in St Thomas?

G.W.B Heating & Cooling is among the highest rated in St Thomas, with 5.0★ from 698 Google reviews.

How are these contractors ranked?

MSARCH ranks St Thomas contractors by their Google star rating, weighted by review count so a company with hundreds of reviews outranks one with only a few. All data is sourced from Google Maps.