In general, it is a good idea to start shopping for a new mortgage between four and six months before your current mortgage term expires.
We currently reach out to all of our existing clients six months before their mortgage maturity date to talk over any future plans and life changes, we can then lock in a new mortgage rate for up to four months while we figure out the best solution.
Most lenders will wait and send out your renewal letter very close to the expiry date of your current mortgage term, they know this will not give you enough time to research and apply for a new mortgage through a different lender.