there are a lot of things to consider…but perhaps one good one that is important at the beginning is the foundation and slab.
Foundations are pretty straight forward, just set up metal/forms and pour. slabs here are different than NA at least in that they -should- reinforce the shit out of them. i used to think it was a scam by the rebar guys, but now we have a good family friend in the business and i get it more. Usually the ground is dug down to hard pan (clay) and then filled with appropriate rock sizes (gravel). here its not, though dirt here is hard naturally due to no top soil left, and often times they will use shitty soil mixed with crap to fill under houses. gravel from the pits would be better, but might be hard if you are in the mountains. there are diggers that can help you, but its illegal and some areas really do watch for illegal rock mining.
anyway, the reason for gravel is it wont settle as much and create air pockets under your slab (slab=floor concrete, the big flat surface area on your home). here they will use dirt often because its easily…this equals lazy/cheap. but then we come round to why there is so much damn rebar in our floors! not just earthquakes which rebar is needed for, but because the soil under the house may be so crappy and have pockets in it, without the rebar the floors would crack far more when the ground shuffles.
building a home here is a nightmare if you don’t know what to watch for. finding workers that even know how to do something right is hard, never mind do something well and honest.
expect to pay $2000/day for average workers slightly above laborer level.
$100,000 could do a small one if you do most yourself. it all depends on what style/materials and how big. 10x10m for foundation, slab and outer wall posts with rebar/concrete (no bricks) will be about $300,000 here. then there is brick, plumbing, electrical, windows/doors, roof etc.
Flat concrete roof try to avoid for $, they have a lot of rebar in them too and cost a lot to make, but they are nice to go up on. metal roof is far cheper.
Buy stress pills.