Outline applications are something I have little experience of.
However in general the parameters are set by the outline and filled in by an approval.
http://www.irishstatutebook.ie/2001/en/si/0600.html
Years ago the outline PP could contain relatively little information and simply get the principle of say a single dwelling x no. bedroom showing the entrance and the drainage.
Previously:
http://www.irishstatutebook.ie/2001/en/si/0600.html
Plans and particulars to accompany application for outline permission.
24. Notwithstanding article 22(2)(d), an outline application shall, in addition to the requirements of article 22(2), be accompanied only by such plans and particulars as are necessary to enable the planning authority to make a decision in relation to the siting, layout or other proposals for development in respect of which a decision is sought.
Currently:
http://www.environ.ie/en/Legislation/DevelopmentandHousing/Planning/FileDownLoad,1487,en.pdf
Plans and particulars to accompany application for outline permission.
24.
Notwithstanding article 22(2)(d), an outline application shall, in addition to the requirements of article 22(2), be accompanied only by such plans and particulars as are necessary to enable the planning authority to make a decision in relation to the siting, layout or other proposals for development in respect of which a decision is sought.
Going for permission is not the same as getting approval on foot of an outline and your friend should take professional advice on whether this constrains the planners to grante him the 8.8M ridge height.
Its also called "permission consequent on the grant of outline permission (stating the reference number on the register of the relevant outline permission)."
I think there may be some case law on this and you should check to see what is the relevant position.
ONQ.
[broken link removed]
All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.