| Business | Phone |
| Gibson Surveying Inc 68 High St, London N6C 4J9 | (519) 438-7794 |
| Holstead & Redmond Ltd 649 Colborne St, London N6A 3Z2 | (519) 672-4551 |
| Callon Dietz Inc 41 Adelaide St N #1, London N6B 3P4 | (519) 673-0220 |
| Farncomb Kirkpatrick Stirling 571 Wharncliffe Rd S #1, London N6J 2N6 | (519) 680-2422 |