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Markham · updated August 2026

Waterproofing Contractors in Markham: the standings

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

Featured slot — open

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

  1. 1
    Groundworks Foundation Repair Toronto
    ★★★★★ 4.9 · 1,728 reviews · Markham · (365) 363-9900
  2. 2
    Aquatech Basement Waterproofing Toronto
    ★★★★★ 5 · 863 reviews · Etobicoke · (416) 300-2191
  3. 3
    RCC Waterproofing Toronto
    ★★★★★ 4.8 · 791 reviews · North York · (416) 747-1920
  4. 4
    Act Fast Waterproofing Corp.
    ★★★★★ 5 · 142 reviews · Scarborough · (647) 993-3466
  5. 5
    Aquatech Basement Waterproofing Scarborough
    ★★★★★ 5 · 108 reviews · Scarborough · (647) 591-5551
  6. 6
    Stay Dry Waterproofing
    ★★★★★ 4.9 · 111 reviews · North York · (416) 782-9379
  7. 7
    Basement Systems Toronto
    ★★★★★ 4.8 · 114 reviews · Ajax · (647) 692-4333
  8. 8
    Agc Pro Construction
    ★★★★★ 4.9 · 59 reviews · Markham · (647) 890-4991
  9. 9
    Direct Waterproofing Inc
    ★★★★★ 5 · 54 reviews · Markham · (647) 956-7249
  10. 10
    Sign Waterproofing
    ★★★★★ 4.9 · 41 reviews · Markham · (647) 568-1718
  11. 11
    RCC Waterproofing Markham
    ★★★★★ 4.9 · 39 reviews · Markham · (905) 918-5044
  12. 12
    Waterproofing PD | Basement Waterproofing Richmond Hill
    ★★★★★ 5 · 34 reviews · Richmond Hill · (416) 333-8222
  13. 13
    Pristine Roofing & Masonry
    ★★★★★ 5 · 32 reviews · Markham · (905) 758-9445
  14. 14
    Toronto Waterproofing Inc
    ★★★★★ 4.8 · 34 reviews · Markham · (647) 781-2921
  15. 15
    Basement Waterproofing Markham
    ★★★★★ 5 · 21 reviews · Markham · (289) 800-7170
  16. 16
    Direct Basement Waterproofing Stouffville
    ★★★★★ 5 · 13 reviews · Pickering · (647) 560-9455
  17. 17
    SuperdryRoofingandMasonry
    ★★★★☆ 4.4 · 19 reviews · Markham · (437) 696-6350
  18. 18
    ACCL Wet Basement, Foundation Crack Repair and Waterproofing
    ★★★★★ 5 · 7 reviews · Markham · (866) 701-8484
  19. 19
    GEO Waterproofing Unclaimed
    ★★★★★ 4.8 · 4 reviews · Markham · (647) 720-7533
How the standings work. Rank = Google rating × review volume, observed for the Markham area in August 2026. No submissions, no fees, no exceptions — a business moves up by earning reviews, not by paying us. Refreshed monthly.

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