Property in question is 3br + study, 2 bath and 2 car. I'd like to convert the study to a bedroom. It's approximately 2.75m x 3.3m but doesn't have a built in. The house also only has 1 living area, however I'm not too concerned about this as the study would likely be used as a bedroom anyway and I'm not losing any living space. Option 1 - No cost Do nothing and just call it a bedroom. Option 2 - Minor cost (Under $5k) The master bedroom next door has a built in robe. I can partly demolish the shared wall and rob part of that built in and seal off the robbed part of the master bedroom. Option 3 - Add a small BIR So I guess my questions are: 1. How do I get it valued as a 4 bedroom, instead of a 3 + 1? 2. Is there any effect in halving the size of the BIR of the master bedroom? Tenants or value wise? 3. Will the room be too small then? Any ideas?