The body corporate under a Building Format Plan (BFP) formally Building Unit Plan (BUP) is responsible for the maintenance outside an owner’s lot, being the boundary of the said lot. This would include the balcony railings, roofing structures, and roof and balcony membranes that provide protection for the lots below or the common areas — supporting framework, like foundations or load-bearing walls and walls that divide the lots or common property. Windows and doors on the boundary of the said lot are also body corporate responsibility including garage doors and fittings.
With utilities, if this is in a shared wall, the body corporate would be responsible for a utility that is shared, which would include pipes, like waste and supply pipes, electrical cabling and gas lines, telephone and intercom. A contractor that is proficient in body corporate can identify this more accurately.
The body corporate under a Standard Format Plan (SFP) formerly Group Titles Plan (GTP) is only responsible for the common property, the external walls and roof and the land are all owners’ responsibility to maintain, it is only the common driveway and shared areas that form body corporate responsibility to maintain.
I have attached both BFP and SFP plans for your ease of reference;
Building Format Plan (BFP)
The bold line around the lot forms the Body Corporate and the fine lines – balcony doors and windows and the floor of the courtyards/balcony are owners.
Standard Format Plan (SFP)
Lots are the block of land and all within are owners to maintain.