Start with care level, not the building. Assisted living in St. Thomas is meant for a parent who needs a hand with daily tasks, medications, bathing, meals, dressing, while still keeping their own routine. If your parent is largely independent and mainly wants company and less housekeeping, look at Independent Living instead. If needs are complex and around the clock, retirement-style assisted living may not be enough, and publicly funded long-term care through Ontario Health atHome is the right conversation.
In our experience, the honest first question is whether to move at all. For a parent with steady, predictable needs and a home that still works for them, Home Care arranged through Ontario Health atHome can bridge the gap and delay a move. We usually recommend assisted living when the support is daily, when safety or medications have become a worry, or when isolation is wearing your parent down. The trade-off is real: a move means leaving a familiar home, and that adjustment is hard even when it's the right call.
A few local notes. Retirement homes in Ontario, which is how assisted living is licensed here, are overseen by the Retirement Homes Regulatory Authority (RHRA); it's worth confirming a residence's licence. Options in St. Thomas cluster near the centre of town and toward the hospital, which helps if your parent still drives less or relies on nearby bus routes and family visits. Because this is a smaller market, the right suite at the right care level isn't always open the day you need it, so start touring before you're in a crisis.
Prioritize, in this order: the care level your parent actually needs today and likely soon, a budget you can sustain, a location that keeps visits easy, and current availability. Tour more than one, bring your parent when you can, and ask each home to show exactly what their care package includes and what costs extra.