Thanks guys. It is honestly beyond me why they would care. It would be a temporary structure fenced in by a (more ugly) 8 foot brick wall. The only person it will affect is me as I'll lose half my garden!
you garden is much smaller now than the others as in you have excceded your permitted development limits
if the the extensions where on the the deed as off 1947 then you would be ok but they are the same as the other houses in the block so anything since is off your allowance
if you note the origional house from front to back covers just over half the plot say 55% front to back leaving nearly half the total are as garden [about 45%]you now have say about 15% left?? so used up your permitted allowance
It looks as though the site hasn't changed between the earlier and present-day maps.
IMO, you would be OK using one-half the remaining yard area; remember that you can include the small front garden in your calcs, AND the thickness of the yards walls at the front and rear.
At the end of the day, if the council grumbled about it, what evidence have THEY got about what was built and when? - probably no better than yours. Are they going to risk taking enforcement action on a matter such as this, where things may not be so clear-cut?
Don't listen to all the doom-mongers; I would never advocate being too cavalier about planning matters, but it's only a shed after all.
The google image posted at the beginning of this thread does not look very clear to me and a comparison exercise should be undertaken to compare what is actually there and the recent site location plan you have found. Site location plans available on council websites or the OS or from anywhere else are renowned for being inaccurate and not up to date.
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