Originally when I was looking at the house, I had some normal structural questions, of which most sales agents couldn't answer nor back up with any proof. So, I really liked the house, location, price, etc...but I didn't want to rush into things.
The water leakage was probably the biggest as I had heard so many stories. They did some concrete injections(mix of silicone and some other nasty shit into the concrete), they recommended the roof needed to be resealed but I did that myself.
There was a contractor which I used before that dropped a few names that I phoned. A few of them came, gave estimates and that is that.
My wife found a guy on the net. Simply went to some blog and asked
"Does anyone know a good contractor in the Zhongli area?"
I don't recommend going through any renovators, designers, etc that are recommended by the sales agent, do the math, they want their cut. Find it independently. Another good place, I know this sounds greasy, but is B&Q. They have a list of contractors a mile long, you don't have to buy anything from them, just ask at the info counter.
**Don't solely rely on someone's 'friend'...protect yourself and get a few people to come and give you estimates on the job. I found their prices and recommendations pretty similar.
Private inspectors can be dodgy as well. That's why get a few to come and get an estimate.Sift through the BS.