Cannot seem to find it on Google
http://www.bailii.org/ie/cases/IESC/1999/
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Could you point to the case? Sometimes these cases are awkward to find in full
Also anything you might have or could point to regarding a case called Horne vs Freeney.
Ir that latter regard the honourable Judge might want to re-read some seminal work which suggests the permission is a matter that is whole and indivisable.
"In Horne v Freeney(1982/60MCA) the court took the view that planning permission is indivisible, that it authorises the carrying out of the totality of the works for which approval has been granted and not some of them only, and that a developer cannot at his election implement a part only of the approved plans as no approval is given for the part as distinct from the whole. This is of course is perfectlly logical and results in complete transparency as to what is the 'permitted development'. " - anon
Ergo if you do vary something you have specified in your permission you could be in breach of the permission.
This applies to interstitial materials involved in the contruction as much as to materials visually apparent from the public domain.
During the last two decades, certainly in the Dublin region permissions became increasingly more specific in relation to colours, brickwork and fenestration
While I accept the "De Minimis" argument in principle, MY principle is that too much information in planning drawings which form the basis of compliant works are a shackle that can be done without.
The logical inference of including something in a drawing is that it is intended to be built that way, and while I accept a court may EVENTUALLY find in favour of the De Minimis argument, it could be a very expensive vindication, whereas an act of omission of unnecessary information deals with the matter simply.
Normally the issue would not have arisen even five years ago, but nowadays clients are far more technically savvy in relation to particular forms of insulation, and theire selection of materials may not be solely informed by their u-value, but also their method of construction, longevity in use, fall off in performance, off-gassing, carbon footprint, cradle to cradle history, etc.
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