Generally speaking, in the case of a private residential home, internal home structural renovation changes do not require the services of an architect, nor approvals by external bodies, unless these impact on windows, doors and rooflines – i.e. on any external element. You can reposition a vanity, bath, shower, or toilet, move a toilet from a separate compartment into an adjoining bathroom, or remove a bath with a shower over and replace it with a shower unit, add a laundry, etc., all without needing approval. However, for strata properties, the addition or moving of wet areas or extra plumbed fittings, will in most cases require approval by the Strata body.
Just as with other elements, it is possible to achieve very individual as well as practical effects architecturally. Consider things such as:
A bathroom renovation where the existing room is, say, being split in half, creating two areas, is a reasonable shift away from the original bathroom layout. If for example, you wish to remove a common wall between an existing separate toilet and adjoining bathroom, a structural engineer would need to provide a certificate and advise the exact type of supports (if any) which are required.
Additional structural works to a kitchen renovation including plumbing or electrical will add cost, but also time to the renovation timeline.