Agree with iguana, there is major recontruction required to get this house right. I think it is a fab estate, my dream place to live but i have to say I was very dissapointed when I went to view this house for the following reasons;
upside down house - not practical for modern family living, especially with a growing family,
ground floor garage in not worth converting into living space cos it does not have proper head height, standard is 8ft, this is closer to 6ft
house built into a hill so first floor becomes ground floor to the rear of the property, its more of a 1.5 storey than 2 storey house
the size of the front windows would cost you a fortune to replace and the need replacing, they are not your standard size or space, could imagine they cost the price of a nice new kitchen
not a fan of sharing living rooms on the same floor as bedrooms
if that house was to function properly you would need to have the ground floor dedicated to a kitchen come breakfast room that opens out onto the rear south facing garden, you would need a utility room, kids den/study and wc, to do this you would need to raise the height of the ceiling in the garage and bring the building forward to the front to increae its sq. ft but not sure if this would still allow you to access the garden from ground level which would be a must for family living.
Its all possible its just that it could cost you a huge amount to do it, if you look under the dlrcoco.ie webiste under planning applications you can see what other neighbours did to convert/extend their houses, its all there along with floor plans etc
you can’t go wrong with the location, its second to none, its whether you can afford the house and renovations, probably worth getting a few professionals in to see whats possible,
best of luck!