Yes, mortgages are available for Self-Build customers, provided you meet all the usual criteria, that is:
For your primary residence, AIB may offer up to 90% loan to value up for First Time Buyers.
For Home Movers up to 80% loan to value is available
You will need to supply particular documents relating to the cost of your Self-Build and the final value, as well as a copy of the planning permission and details of the proposed size of the property. Your AIB Mortgage advisor can give you all the detail on this over the phone or in your local branch.