You say you are moving pipes “along the wall”, so as the other responders say, you need to determine if the wall is common property (ie, a boundary, shown in dark lines on the strata plan), or an internal wall, which means the wall is all your own property. Also, do those pipes only supply water to your Unit, or are they supplying other Units too? If they supply more than one lot in the plan, then they are common property. Finally, only pipes inside the boundary wall count as common property. So possibly you could connect to the internal wall pipes at a convenient spot, and run new pipes along the wall (inside the new cupboards perhaps), and pipes in the “volume” of the Unit, and not inside a common property wall, then belong to the owner.
The issue is about who is responsible in the future if a new pipe leaks? The renovation by-law transfers responsibility to repair and maintain a common property item from the owners corporation to the owner, from then on. In the future, people may forget about the renovation, and when a plumber turns up to fix a burst pipe, the renovation by-law (if someone remembers to check it) will mean that the owner gets charged, instead of the OC for fixing the replaced pipes.