This is a variable situation, it depends on the documentation and what has been originally negotiated.
At times, there’s an option to renew, sometimes there’s not.
There’s always a commencement date and then lease terms. For example, the commencement date occurs on 14 September and is a three-year lease, with no option to renew.
If you are considering leasing a property, and it does not have an option to renew, prior to signing, you could negotiate and ask for a renewal option to be included.