Thanks to all friends here that have PM-ed me and gave me advice.
Actually we are still considering, whether to get a contractor to do all, or we ownself find different sub-con for our renovation, no hurry to move in anyway.
Pros: price should be cheaper than above quotation by around $3-4k?
Cons: we dont know where to get our permit for renovation
Ours is an EA of 138 sq thou.. i just cannot stand the quotation for toilet and PD door, the price of hacking 1 master toilet alone and doing it up is $5400, abit too much in my opinion