| Business | Phone |
| A M Candaras & Assoc 8400 Jane St, Concord L4K 4L8 | (905) 738-0043 |
| Amelin Engineering Co 91 Fernstaff Crt #2, Concord L4K 3L9 | (905) 669-6998 |
| Ander Engineering Ltd 200 Connie Cres #200, Concord L4K 1M1 | (905) 669-3700 |
| Axiomatic Product Development 201 Millway Ave #11, Concord L4K 5K8 | (905) 760-1721 |
| Greenland Consulting 7880 Keele St, Concord L4K 4G7 | (905) 738-1818 |
| Ian Dunlop & Assoc Ltd 17 Cherry Hills Rd, Concord L4K 1M2 | (905) 660-1877 |
| Keewatin-Aski Ltd 2900 Langstaff Rd #21, Concord L4K 4R9 | (905) 669-9765 |
| M & E Engineering Ltd 8555 Jane St, Concord L4K 5N9 | (905) 761-7778 |
| M & T 2001 Ltd 270 Pennsylvania Ave, Concord L4K 3Z7 | (905) 761-7770 |
| R Sneddon & Assoc Inc 2180 Steeles Ave W #220, Concord L4K 2Z5 | (905) 738-1406 |
| Simpson Engineering 16 Spinnaker Way, Concord L4K 2T8 | (905) 738-0891 |
| Building Sciences Inc 221 Rayette Rd #1, Concord L4K 2G1 | (905) 760-0869 |
| Emc Group Ltd Engineers Plan 7577 Keele St, Concord L4K 4X3 | (905) 738-3939 |