To start of with:
Solicitors Fees - searches, land registry etc
Architect Fees - overseeing, plans, retention, BER cert etc
County Council contributions and retention fees if necessary
Valuation fee - for bank
Contingency - VERY imporant. Make sure you have one and stick to budget as much as possible. Source things yourself and liaise daily with your builder/architect/project manager.
ESB set up fees
Best of luck. Feel free to pm if you want any more info.