Hi ONQ. What about if the extension is at the back of the house, but there was a side extension added a long time ago (possibly soon after the house was built circa 1960).
Tx
Hi Firefly,
Sorry for taking so long to come back - lot on just now.
"Extensions" to the side can be exempted if they comprise solely of the conversion of a Garage to the side of the house.
Garages and carports can be built to the side of the house.
Thus there seems to be a causal chain that can be followed but a straight extension - nope, not as far as I know.
What Superman has referred to may be deemed to be free from enforcement action IF there was never any action taken before AND the time is elapsed.
The 1994 Regulations set this at 5 years following a High Court Action in relation to a planning advertisement hoarding.
The current Planning and Development Act is as per Superman's comments for developments undertaken without benefit of permission - 7 years.
This rises to twelve years for developments undertaken on foot of a permission but not built in compliance with it.
Pre-'63 developments are generally considered exempt.
Works carried out prior to the 13th December 1989 are deemed to have Bye-Law Approval.
However an unauthorised side extension "shielding" development to the rear of it may not in itself comply with the requirements of being part of the "front" of the house, but its a question for the local authority.
You can asked a general question of them in the form of a Section 5 Declaration which may shed some light on the matter - costs €80 and takes four weeks IIRC.
ONQ
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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.