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Thornbury · updated July 2026

Basement Waterproofing Companies in Thornbury: the standings

19 basement waterproofing companies serving Thornbury, ranked by Google rating and review count. The bar shows each one's review volume against the leader. Nobody can pay to move up.

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One labelled spot above these standings, reserved for a claimed Thornbury business. It never changes the ranking below. Claim your listing to take it.

  1. 1
    Systèmes Sous-sol Québec
    ★★★★★ 4.8 · 1,143 reviews · Thornbury · (514) 800-6406
  2. 2
    RCC Waterproofing Toronto
    ★★★★★ 4.8 · 791 reviews · (416) 747-1920
  3. 3
    Direct Basement Waterproofing
    ★★★★★ 5 · 311 reviews · (647) 492-5893
  4. 4
    Foundation Brothers
    ★★★★★ 4.9 · 170 reviews · (226) 228-4095
  5. 5
    City Wide Group
    ★★★★★ 4.8 · 187 reviews · (416) 283-5500
  6. 6
    Aquamaster Basement Waterproofing Etobicoke
    ★★★★★ 5 · 141 reviews · (416) 901-4562
  7. 7
    Aquamaster Basement Waterproofing Barrie
    ★★★★★ 4.9 · 105 reviews · Barrie · (705) 881-8141
  8. 8
    Basement Systems Toronto
    ★★★★★ 4.8 · 114 reviews · (647) 692-4333
  9. 9
    Perimeter Water Solutions Corp.
    ★★★★★ 5 · 46 reviews · Alliston · (519) 217-7968
  10. 10
    Wet Basement Resolutions
    ★★★★★ 4.7 · 38 reviews · Wasaga Beach · (647) 234-7244
  11. 11
    Quality Age Build Inc- Underpinning, Garden and Laneway Suite Foundation
    ★★★★★ 5 · 24 reviews · (647) 287-1107
  12. 12
    Hayden's Finishing Solutions
    ★★★★★ 5 · 17 reviews · Thornbury · (705) 441-4365
  13. 13
    Evenflow Canada Inc.
    ★★★★★ 5 · 17 reviews · Thornbury · (844) 379-4848
  14. 14
    Simcoe Basement Waterproofing
    ★★★★★ 5 · 13 reviews · Barrie · (705) 230-0057
  15. 15
    Ontario Wet Basement Solutions Inc.
    ★★★★☆ 4.3 · 19 reviews · Barrie · (844) 533-4949
  16. 16
    Bay-Mount Service
    ★★★★★ 4.5 · 16 reviews · Thornbury · (519) 599-2024
  17. 17
    Longarm Contracting
    ★★★★★ 4.7 · 14 reviews · Stayner · (705) 441-4631
  18. 18
    Dryshield Basement Waterproofing Collingwood
    ★★★★★ 5 · 9 reviews · Collingwood · (249) 660-8065
  19. 19
    City Wide Group
    ★★★★★ 4.5 · 11 reviews · (519) 501-1442
How the standings work. Rank = Google rating × review volume, observed for the Thornbury area in July 2026. No submissions, no fees, no exceptions — a business moves up by earning reviews, not by paying us. Refreshed monthly.

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