If this is in a housing development (as opposed to a once-off self build) the bank usually just require a letter from a valuer stating the stage of construction and the present value of the property, this costs €50 - €65. You probably got a valuer to carry out a valuation when applying for your mortgage so they can do this interim valuation for you also.
After sending this into the bank (assuming they have all other documents i.e insurances & request from solicitor), it should only take 3-4 days before they release the cheque to your solicitor.