Nailer,
8 months is reasonable with a busy contractor, plus it is better to take time and get some degree of quality rather than a rushed job where quality is most definitely compromised.
That sounds like a very good price for a complete build in Dublin. A mate recently had a two storey extension to a 3-bed semi done in Dublin for €200k+
Roadrunner,
I presume you mean 251 sq meter ?
I would say you are under budget if you plan to use a main contractor.
You should at least be working off 100/sq ft, but everything is relative to many different factors, initial site work, the quality of materials and finishes you put in.
For example,
internal doors developer quality €40 or solid wood €350+ each
Windows pvc (€8-10k) or scandinavian wood windows/ alu clad windows (€20k+)
Budget Kitchen up to €5k or luxury job at €30k+
Any difficult site conditions, slope, rock, soft ground, trees ...
Stone facing, hardwood cladding, hardwood internal joinery, eco type heating systems etc.
I hope to be detailing my own self build in the south east on a blog shortly on
[broken link removed]
AndyH