For a timber frame, I am going to say €85,000 for the frame (includes insulation/doors etc, €20,000 for brick (nixer), €24,000 for good wooden windows, electrics €10,000, heating system €15,000 etc, estimating/guessing on the basis of what you use, put in your house, heating system chosen, whether you use brick or plaster etc, around €220,000ish not including kitchen units, flooring, etc. This is just going from what we are doing, building a timber frame house @ 3,200sqft, I deducted a bit off on your price and we are on our way over €330,000 but we have our aga, oak floors, good heating system, glass wall, just a few never have to do again treats along the way but that is when it starts to add up, when you try and fill the house!!
The key is to haggle, try and get the VAT back anyway you can, nixer work, contacts (most important), favours if you have a trade, otherwise the price will take off without you even noticing.