splitting loan into ppor & Ip.

I am in the process of building a PPOR with Ip attached to it. How do I go about splitting the loan up into PPOR & IP so i can tell them apart?
I only have a contract price for the total construction so am unsure on exact cost of IP.
Ip is smaller than PPOR so the sqm $rate would be more as it has a kitchen and bathroom with less living area.
I reliase if all else fails maybe get a QS report when complete, but i will have drawn done on loan by then and will need to have setup loans prior.

Any ideas?
 
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