| Business | Phone |
| A & A Plumbing & Mech Svc 35 Romfield Dr, Markham | (905) 471-7772 |
| George Griffiths & Sons Ltd 300 Steelcase Rd W #25, Markham L3R 2W2 | (905) 475-6518 |
| Ready Rooter Plumbing & Drain 151 Esna Park Dr, Markham L3R 3B1 | (905) 415-5113 |
| Battaglia Mechanical Svc 210 Don Park Rd, Markham L3R 2V2 | (905) 415-2136 |
| Universal 85 Ferrier St, Markham L3R 2Y9 | (905) 943-9119 |
| Universal Building & Property 4116 Highway 7, Markham L3R 1L6 | (905) 513-9925 |
| V A Reid & Sons Plumbing Ltd 78 Main St S, Markham L3P 1L4 | (905) 294-3615 |
| Van-Horne Plumbing & Heating 24 Wentworth Crt, Markham L3R 7N7 | (905) 470-6442 |
| Bruce Clark & Son Plumbing 81 Reginald Cres, Markham L3P 3T8 | (905) 472-4845 |
| Caldwell Plumbing 20 Fred Varley Dr, Markham L3R 1S4 | (905) 474-0061 |
| Complete Plumbing Ltd 42 Foundry Cres, Markham L3P 6W4 | (905) 472-2724 |
| Gage Plumbing & Drain 16 Captain Rolph Blvd, Markham L3P 2P6 | (905) 294-6235 |
| A. Smith Plumbing Drain and Heating 2600 John St, Markham L3R 4H9 | (888) 401-1342 |