The internal design of a house is rarly scrutinised by the planners, but i'm pretty sure that there covered in that they say all developments must comply with building regulations etc etc... so sorry to say, building control are right. Mind you, if your smallest point of a riser is 50-75mm, i think that this is legal, with the only people at present, who do not recognise winders is Homebond. They will not cover a house that has winders in the stairs.
. Check out this web address. Its UK Regs but irish regs are much the same.
Tech doc C 12 does state the winders are best at the bottom of the stairs, be this reg says they should generally not be used... it doesnt say it cant be used.
Hope this helps.