Sorry to hear of your plight - its very unfortunate how things have turned out for you both.
I think that the issue of the house not being finished internally will affect your potential return, but that is separate to the matter of restrictive conditions.
I think there has been comment passed on AAM and Archiseek before about the unsuitability of conditions like the one you are bound by.
Such conditions were intended to restrict permissions in rural/scenic locations but they have come under serious scrutiny.
The advice of which I am aware is a report by the Law Society’s Reform Committee on the Bórd Pleanála website.
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I hope this is of some help, but really you'll be throwing yourself on the mercy of the local authority.
The condition has been imposed by the planning process, thus seems it will have to be removed by the planning process.
I don't know the mechanism whereby to approach the Planners or what mechanism they might use to remedy the matter if they wanted to.
Starting a dialogue with the Planners as early as possible seems to be one way forward - or you could talk to a solicitor, but that'll cost you money just for the talking.
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.