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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.
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Is the 45ยบ rule of extension size actually enforced? Looking at lots of the ones out my back window I can't see how they pass.