| Business | Phone |
| Atkins Architect 10 Commerce Valley Dr E #401, Thornhill L3T 7N7 | (416) 324-3333 |
| Harvey T Beecroft Inc 34 Doncaster Ave, Thornhill L3T 4S1 | (905) 889-2669 |
| Khazra Architect Inc 105 Glen Cameron Rd, Thornhill L3T 1N8 | (905) 709-6599 |
| Lubelski, Leon 1 Promenade Cir, Thornhill L4J 4P8 | (905) 882-6518 |
| Morgulis, A 67 Sprucewood Dr, Thornhill L3T 2P9 | (905) 764-1707 |
| Slopack, Marlene 60 Kings College Rd, Thornhill L3T 5J8 | (905) 886-5048 |
| Sullivan & Pacek Inc 155 Bay Thorn Dr, Thornhill L3T 3V2 | (905) 889-0612 |
| Haim Riback Architect 2 Pinevale Road, Thornhill L3T 1J6 | (905) 882-7459 |