Does a By-Law have to be registered before work starts?

Hi,

Recently our Owners Corporation (in NSW) approved a by-law for a major renovation for one unit, including bathrooms (tiling and  waterproofing) larger openings in external walls for bigger windows and doors etc.

When does the by-law have to be registered ?

Before the work starts ?

This would make sense, as if they were to cause a problem during construction, but before the by-law was registered, they may try and say the responsibility for fixing it lies with the Owners Corporation.

Any pointers to legislation etc would be greatly appreciated.

Thank you