Hi albob,
I AM an engineer and I can tell you straight, there's not much for us to be checking at the end of a job!!! Usually 5 visits are made to form an "opinion on compliance", which is the document he should furnish you with, with visits being made at foundation, ground floor, 1st floor, eaves level and roof level. After the roof is on, it's all cosmetic to us really!
Check if this guy is a member of The Institution of Engineers of Ireland. Anyone signing off on a house should be Chartered with the title "CEng" and "chartered engineer" after their name. If he's not, then whatever he gives you is not worth the paper it's written on.