Will be doing the same thing myself sligo over the course of the next 18 months. Met my architect before christmas to get my planning permission changed from a bungalow to at least storey and half or storey and threequarter. Bloody planners havent a clue
Got the site surveyed. They have allowed 5.5m ridge height and there is a shed in the field beside it with a ridge height of 8.5m at it is at a higher level!
Lots of ideas floating about. One major decision is whether to plump for timber frame or go traditional cavity blockwork with concrete floor slabs.
As for yourself. the major battle will be in getting a good builder. Do you go for someone to organise everything for you or bring in the tradesmen as you need them.(brickie,spark, plumber, joiner, etc) As i work in this trade i will be bringing in guys i know and trust to go a good job. Drawings are relatively easy to knock up, building from them can be another thing!
Other decisions are do you go with the new green alternatives out there for heating/plumbing systems., ie wood pellet boilers, thermal ground heating. There are a few grants knocking about to get a few of these things installed. Another choice is radiators or underfloor heating
Stone masonry facing seems to be the in thing in the west of ireland at the moment. will you be going for that?