A lapsed building permit describes the process of a permit that has ‘run out of time’. The Certifier should have provided a Form 57 to advise that the permit was going to run out. How a lapsed permit is handled depends on a variety of factors. It may be possible to extend the existing permit or a new application may be required.
You should stop construction and contact the original certifier to find out what options you have to reinstate or renew the existing permit or if a whole new application will be required.
The length of time a permit can last varies depending on what is being built. The maximum time is 2 years but not all permits will last this long. How long the permit is valid for will be on the original building approval documentation.
As with most things in Certification it will depend on what you are constructing and how long your Certifier can offer. Think about your construction timeline and possible delays and try to ensure the renewed permit will cover the time you need.