Hi SS
I'm also in the middle of doing a 1/72 building but mine is a garage with a 2 storey house next to it .
I'm using cardboard for the main structure and also balsa wood as for scale for a 1 storey house I would go about 7 cm high that should be high enough.
For brick work you should be able to use platicard or balsawood and cut small bricks from that, for the roof tiles try using cereal cartons there about the rightwidth.
Ron