Remember to include another few thousand euros for kingspan insulation under the underfloor heating and many plumbers want this layed before they arrive. Your electrician is also going to want a couple of hundred to hook up all the temp stats in all the rooms, chasing and setup on the controller. No mention in the quote for a controller needed to control your 3 zones (downstairs, upstairs, water).e.g .So another couple of hundred there.
I'd get a price without the ufh. If it's allot cheaper, then maybe forget about ufh. The price quoted above looks like peak building boom prices.
Buyer beware, there are always extras bills at the end of the job from many plumbers ( explain at the start that any extras need to be flagged and quoted before the work starts). Good luck.