floor plan

We have $25,000 to open up this floor plan for weatherboard in Albion. Will source stuff second-hand where possible and do a lot of work ourselves but due to measly budget can't move existing plumbing except to add second toilet to central bathroom. GOALS: Make room for second toilet...

I am wondering where can I find a property's building plan? I am not sure if building plan is the right term for it. Basically I am after something like a floor plan which at a minimum tells me how all rooms are laid and preferably gives me room dimensions. I bought some plans from...