Itemise and breakdown is actually better if the items should to be itemised. At least you will be assured that you will not face a hefty bill for a variation order halfway through the renovation.
I took a quick look at your contractor quote, the itemized breakdowns are reasonable but he/she is overcharging you for certain items such as
- Washing machine base, market rate is $120 - $150 only
- Overlay Bathroom wall tiles, $4400 to overlay is very expensive, that would probably be the price charged when you lay new wall tiles on a hacked wall
- Kitchen Cabinet price ranging from 130 - 150 psf, market rate (with internal white pvc) only 120-130
Not much comments on the remaining items as I don't have such heavy customisation in my quotes received.
But to be honest you did also include quite a lot of carpentry in your kitchen and living room
1 set of kitchen cabinet, 1 set of 17ft ushape cabinet (how do you even fit so much carpentry into a bto kitchen?), 1 full height cabinet, 1 island cabinet
2 sets of Vanity and 2 sets of storage in the toilets (BTW the contractor copy and pasted wrongly by attributing all 4 carpentry to your MBR toilet)
The amount of carpentry quoted would have been enough for a 5 room BTO so really quite surprising to see it all squeezed into a 3 room.
Unless you are not considering to upgrade to a 4rm/5rm in the future, I would suggest to go easy on the carpentry and just go for the bare necessities.