OK - to be very clear: the distance from the original rear wall of the dwelling (the rear wall of the outrigger), to the rear most point of the rear-most proposed extension is 3m.
Oh right. In that case, one more complication might be that through demolishing the original outrigger to then rebuild and extend it, the council may well take the measurement from the rearmost wall you are not demolishing as in effect you are building a 6m extension (albeit you refer to part of the extension as a re-build).
Not sure you will get much more useful advice on here, you may be at the point of having to decide whether to seek the Council's view (i.e. apply for an LDC), or wing it.
Oh right. In that case, one more complication might be that through demolishing the original outrigger to then rebuild and extend it, the council may well take the measurement from the rearmost wall you are not demolishing as in effect you are building a 6m extension (albeit you refer to part of the extension as a re-build).
Not sure you will get much more useful advice on here, you may be at the point of having to decide whether to seek the Council's view (i.e. apply for an LDC), or wing it.
With full planning I would be willing to place a bet that they would not allow the 3m extension that is infilling the gap. At least they would not allow it unless I lowered the whole thing to fence height (around 2m) and then dug down. I had a look through old planning applications and they were pretty much rejecting all rear extensions on terraced houses due to amenity of neighbours.
PD extensions are more about changes in size and volume than retention of actual fabric.
Sure if you demolish the extensions then put in an application they will count it as 6m, but assuming that wont happen it would count as changes to the existing fabric plus an extension. Whether you rebuilt large parts of it or not doesn't really seem to be stipulated in the PD order.
Although that existing outrigger doesn't look original, although it may well be older than 1948 and therefore okay, but I'd expect the LPA to query it and ask for proof (historic maps maybe?)
lt8 - It isn't written anywhere in the PD rules regarding the "Gap" it's come from precedent and it would probably apply everywhere (single storey / 2 storey / side / rear etc.)
I.E. If you have a side wrap around extension and want to put a rear extension immediately next to it, if the extension "reads" as one then even if it is separated by a few millimetres, it's likely to be judged as one big extension (especially so If it has clearly been built to function as one large extension). Tony's last post puts it across well.
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