Hi paulus1 and welcome to rootschat,
I got my ( initial) Irish passport, which was around 12 or 13 years ago I think withithout digging out my Irish passport to have a look at the exact date it was issued ,but I haven't renewed it, which I should do - I'll probably have to start from scratch again for a new one submitting all the certs again, if I don't renew my expired one very soon. ( My mother is from N ireland , I was born in Wales)
When I did mine , I found it really pretty straight forward
You just need to follow the instructions on the passport application. All you need to do is prove who you are and prove that your parent is your parent and was born on the island of Ireland ( the Republic or in Northern Ireland )
You will need your full birth cert of course, plus you will need your parent's full birth cert too ( the one who was born in Ireland) , also I submitted my parent's marriage cert too. ( but wouldn't really have needed it if they hadn't married, as I was going through my mother)
You need the certified certificates , and also long birth certificates not short ones ( I only had a short one, so had to apply for my long one from the GRO for my passport application) . I also had to apply for my mother's birth cert from groni as I didn't have her birth cert.
The only problem I had with them believe it or not was my photo for the passport lol - my photos got rejected two times for various reasons , photo was too close or off centre ( and I had these photos taken in my local PO by their staff ,which they have the set up for passport photos ! ) - In the end I ended up doing the photo myself at home ,with our own camera which was accepted without further ado .
The requirements don't seem to have changed since I did mine :
" Additional documents
If you were born abroad to a parent born in Ireland or Northern Ireland - you should also include:
Your Irish-born parent’s birth certificate
Your parents’ civil marriage" quote
which of the requirements on your passport application are you having problems with ?
Very Kind regards
PS I am assuming your Irish father was married to your mother , and/ or, is on your birth cert ? If not, you may have a problem - I don't know what proof they require for those types of circumstances, if the Irish father isn't on the child's/applicant's birth cert.
Or If it's just the case of not being able to find your father's birth cert with the Irish GRO ( as some people slip the net and their births were never registered and so on) . I think they will accept an official baptism record , which I seem to recall reading somewhere on my then passport application.
But all in all , the passport application forms are pretty straight forward if neither of these two circumstances apply to you.