Can I suggest that you ring up and talk to or meet your local planning officer. Bring a map of the house site or an OS Map or even a Google Earth print.
You can install hard paving [the driveway proper] for up to two cars in Dun Laoghaire Rathdown without permission AFAIK and I think its the same in Dublin 12.
You can build a front garden wall up to 1200mm/4ft high without permission and a rear garden wall 2000mm high.
You can install gates up to 2000mm/6 foot eight inches high without permission - watch the height of the wall though - it can only be 1200mm in front of the building line!
The only thing you might need permission for is the vehicular entrance itself if you haven't already got one and the pavement dishing.
Its important that you get your planners advice in case there is something buried in the Development Plan or the regulations that could affect your application.
As for who could do it for you, there are at least three architects posting here [for free, I might add
] and a heck of a lot of them out of work all over Dublin. Take your pick, my friend.
ONQ.
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