Start with the real measurement. A doorway needs about 32 inches of clear width for most wheelchairs and walkers to pass without scraping knuckles or hardware. Measure the actual opening with the door standing at 90 degrees, not the frame. If you're short by only an inch or two, offset (swing-clear) hinges are the low-cost fix worth trying first. They pull the door out of the opening and can buy you the room you need without touching the wall. We'd start there before committing to full framing work.
The bigger question is what's inside the wall. In older Mississauga homes around Cooksville, Streetsville, and Port Credit, a doorway may sit in a load-bearing wall or hide plumbing and wiring. That's not a DIY job. Widening a structural opening means a proper header, and often a permit. Newer homes in Meadowvale or Churchill Meadows tend to be more predictable, and condo units near Square One come with their own rules, so check with the building before anyone lifts a hammer. Ask any contractor to confirm whether the wall is load-bearing early, because it changes the whole scope.
Prioritize contractors with real accessibility experience, current WSIB coverage and liability insurance, and a clear written warranty on both labour and materials. Ask how they handle winter access and cleanup, since a proper mudded and painted patch takes a few visits to finish well.
Our honest take: for anything more than offset hinges, hire a licensed contractor rather than a handyman. The cost of door widening in Mississauga is higher when you go the professional route, and that's the trade-off, but structural doorway work done wrong is expensive and unsafe to redo. Get the header and permit right the first time. If your budget is tight and you only need a small gain, offset hinges alone are a smart, defensible choice.