In considering this, one has to distinguish between the expiration and termination of a lease agreement.
Where a lease agreement was concluded for a specific period, for instance, six months, the agreement would terminate or lapse on the last date of the six months, where the landlord has not renewed the agreement. If the tenant continues residing in the property and the landlord has not given the tenant written notice to vacate the property, the lease agreement would endure on a month-to-month basis.
Typically, a lease agreement would have a specific clause to address any events of default. The general process applying in such an instance is that the landlord must send a notice to the tenant to remedy the default within a specific period, which will be stated in the lease agreement.
Where the lease agreement is silent on the period of remedy to be provided, section 14(2) of the CPA states that a period of 20 business days must be afforded to the tenant to remedy the breach. If the tenant fails to remedy the breach and the landlord elects to cancel the lease agreement, notice must be given to such effect.