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Not really considered for single-storey extensions in a typical street setup like your reference diagram with PD rights contradicting your reference diagram, but giving guidance on extension height. Daylight and sunlight measures are definitely considered for taller or two-storey+ extensions.
You do see extensions that taper down to the boundary wall line, and these are often setout by a 45degree line taken from the nearest habitable ground floor window in elevation, or local authority design guidance.
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Doesn't apply if within permitted development rules, but for planning it does I believe.
When we applied for planning we had to change the design of ours slightly to daylighting angles.
Wouldn't let us go 4m out along the length, so we took a 45 degree corner out, and put a full height window in. -
45 degree rule is used for planning permission. Only relevant to neighbouring habitable rooms tho - not bathrooms kitchens etc.
Permitted development will let you do a 3m rear ex on a terrace - with a max flat roof eaves of 3m I think. But check the booklet for all the rules.
IMO In many ways the PD rights are fucking local character but that ship has sailed and every *persons house is their castle I guess
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EstelleGetty
Acliff
Sheppz
@dbr
Is the 45º rule of extension size actually enforced? Looking at lots of the ones out my back window I can't see how they pass.