I feel that most important things people have to consider are:
1. how much does the house worth?
If the house will worth around 300k and if you know nothing about how to build a house, I would say you won't save nothing on it.
If the house will worth around at least 500k and even you don't know anything of building a house and hire a company to do it for you, it is possible that you can save some money. If the house will worth around 800k to 1000k, it is more possible that you can save a lot.
2. you own opportunity cost
Calculate your own earnings if don't build by yourself, in other words, calculate your own opportunity cost.
3. Why most people choose to buy directly instead of building by themselves (or hiring others to build)?
Think about it! Spending $60 , people can buy a pair of shoes, but if one choose to make a pair of similar shoes by themselves, it may cost them more.....(main reason is minimum wage in Canada: $8/per hour!)
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总之,如果你没有
Builder 小陈的实力,望三思而行。切记古训: 土木之工,不得妄动!