Wow - that's very high.
We are coming towards the end of a self build in the West also (Co. Galway) . It's about 2,700 sq ft, storey and a half in the front and 2 storey in the back. Solar panels, hollow core, underfloor heating up and downstairs, top spec for all insulation , condenser boiler , walnut floors & doors, walnut & glass stairs , hig-gloss contemporary kitchen, top spec tiles, footpaths, big garage with floored upstairs etc etc.
All in, fully finished, on a direct labour basis, we will bring it in close to 200-220k. Now, that's a very good cost because, even though none of them are in the trades, my husband and his brother/dad did a lot of donkey work such as installing the solar panels themselves, doing all the dry lining & insulation themselves, clearing the site, painting etc etc. What they saved on this kind of work meant that we didn't need to budget on things like kitchen or flooring.
However, when we were getting quotes from contractors 2 years ago (i.e. near the height of the boom) max quotes that we got for a builders finish , which is what it sounds like you'll be getting, were around 280k for this house. I can't see how they could be charging so much more for a builders finsih for a similarly sized house in the West of Ireland, in the current climate. I would have expected that the contractors would be more competitive in their quotes these days as the labour costs have dropped substantially, even if materials haven't.
Hope that helps.