I usually build the most expensive house that I can on each level based…

I usually build the most expensive house that I can on each level based on workers and material that I have at the start of that level. I sell that house to raise cash for effeciency training and materials and even new house blueprints if available on that level and for empty lots that come up for sale. It seems to work pretty good. It is also a good strategy for causal mode.