Williamson Buick Pontiac Cadillac GMC
| Sales Department | Monday - Thursday | 8:00am - 8:00pm |
| Friday | 8:00am - 6:00pm | |
| Saturday | 8:00am - 4:00pm | |
| Service and Parts Department | Monday - Friday | 7:30am - 5:30pm |
| Tuesday | 7:30am - 8:00pm | |
| Saturday | Closed | |
| Collision Centre | Monday - Friday | 8:00am - 5:00pm |
| Tuesday | 8:00am - 8:00pm | |
| Saturday | Closed |
Williamson Chevrolet
| Sales Department | Monday - Thursday | 8:00am - 8:00pm |
| Friday | 8:00am - 6:00pm | |
| Saturday | 8:00am - 4:00pm | |
| Accounting | Monday - Friday | 8:00am - 5:00pm |
| Saturday | Closed | |
| Reconditioning Centre | Monday - Friday | 8:00am - 4:30pm |
| Saturday | Closed |
Williamson Leasing
| Sales Department | Monday - Thursday | 8:00am - 5:00pm |
| Friday | 8:00am - 6:00pm | |
| Saturday | Closed | |
| Accounting | Monday - Friday | 8:00am - 5:00pm |
| Saturday | Closed |