When you buy your housue, you have to examine actual spot, design, estimation,finance, contract, construction work starting, completion, inspection, legal transfer, after maintenance, fire insurance and so on thoroughly. It is important to avoid all risks, because it is a final shopping once in a lifetime. You have to pay attention to the earthquake-resisting capacity and each provisions of constract documents. Most important thing is that you make arragements with details tightly. If you can negotiate logicaly, you may be able to build the highly efficient house economically. It is not so good to let the house agent discount simply.