I cant recommend a tiler but doors can be bought in different sizes.Try Chadwicks in Midleton , they have a better choice than the Coop and are certainly cheaper than the "forest something shop" in between them at the river side. These ready made doors (pine wood) can be cut/planed down to fit the required size. Not more than about two centimeters per side, they might fall apart if cutting off more than that, better take one size smaler.
The shop at the river side (" Forest something " at Willow Bank, I have forgotten the name) will make doors for you on demand.They have a fully equiped workshop.