Allowable extension width...half of downstairs width or upstairs?

September 3, 2020 by Sarah Tadros in forum Planning Forum

#798 Sarah Tadros, 3 September 2020, 00:16

We want to make a 4m wide single storey extension to the side of our house without needing planning permission. We are an "end of terrace" which has a passageway between us and nextdoor (which we also own this property, if that makes any difference), and the upstairs of our house goes over the full width of the passageway, joining onto nextdoor upstairs only. The passageway itself belongs to both properties.
We are allowed to build out to half the width of the property, but it is unclear where we have to take these measurements from...our downstairs wall adjoining the passageway, our upstairs wall adjoining nextdoor, or half way between? Desperately hoping it would go from the upstairs measurement as otherwise would be far too narrow. Does anyone know for sure?
Many thanks

#799 Damian, 3 September 2020, 07:11

Out of interest, how wide is this passageway?

#801 Sarah Tadros, 3 September 2020, 14:21

It is approx 1.3m which makes quite a bit of difference when the downstairs is pretty narrow. But thankfully our architect found a regulation that states the width is calculated from the widest elevation of the house..which would be upstairs. Hoping to now have the certificate of lawful development was the planning department which had raised this issue

#802 Damian, 3 September 2020, 18:07

Handy if you need that additional 650mm width.

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