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Markham · updated August 2026

Basement Waterproofing Companies in Markham: the standings

18 basement waterproofing companies 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.

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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
    Direct Basement Waterproofing
    ★★★★★ 5 · 311 reviews · Brampton · (647) 492-5893
  4. 4
    Dryshield Basement Waterproofing Toronto
    ★★★★★ 4.9 · 292 reviews · North York · (800) 277-5411
  5. 5
    Direct Basement Waterproofing Mississauga
    ★★★★★ 5 · 133 reviews · Brampton · (647) 693-2053
  6. 6
    Aquatech Basement Waterproofing Scarborough
    ★★★★★ 5 · 108 reviews · Scarborough · (647) 591-5551
  7. 7
    Stay Dry Waterproofing
    ★★★★★ 4.9 · 111 reviews · North York · (416) 782-9379
  8. 8
    Basement Systems Toronto
    ★★★★★ 4.8 · 114 reviews · Ajax · (647) 692-4333
  9. 9
    Direct Basement Waterproofing Pickering
    ★★★★★ 5 · 57 reviews · Ajax · (647) 584-0571
  10. 10
    Direct Waterproofing Inc
    ★★★★★ 5 · 54 reviews · Markham · (647) 956-7249
  11. 11
    Basement Waterproofing Pickering
    ★★★★★ 5 · 49 reviews · Ajax · (289) 670-9460
  12. 12
    Sign Waterproofing
    ★★★★★ 4.9 · 41 reviews · Markham · (647) 568-1718
  13. 13
    RCC Waterproofing Markham
    ★★★★★ 4.9 · 39 reviews · Markham · (905) 918-5044
  14. 14
    Waterproofing PD | Basement Waterproofing Richmond Hill
    ★★★★★ 5 · 34 reviews · Richmond Hill · (416) 333-8222
  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
    ACCL Wet Basement, Foundation Crack Repair and Waterproofing
    ★★★★★ 5 · 7 reviews · Markham · (866) 701-8484
  18. 18
    Basement Waterproofing North York
    ★★★★★ 5 · 4 reviews · North York · (647) 691-9286
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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