So under David Cameron there were quite wide rights granted to allow Permitted Development of single story extensions with some restrictions.
The first question is "are you in a conservation area?"
https://www.wandsworth.gov.uk/planning- ... ion-areas/
The reason that is important is that
Planning authorities also have the power to remove further permitted development rights by issuing what is known as an 'Article 4 Direction'. Article 4 Directions can be made on any land within a planning authority's area, but they are more likely to be imposed in conservation areas. Wandsworth generally doesn't do Article 4 Direction except in conservation areas which do, however, cover a large % of the borough.
So you will need to check the specific conservation area guidance from Wandsworth and it will tell you explicitly what is subject to Article 4.
If it isn't in a conservation area then it is likely that it falls under the stand Permitted Development regime. Which is spelt out in the link below from the planning portal.
https://ecab.planningportal.co.uk/uploa ... nsions.pdf
All of this is obviously subject to actually checking what the situation is.
BTW it is a bit of an old wive's tale to suggest that what next door did is likely to be OK. Planning doesn't really work by precedent.
What next door did could have been done:-
- without regard to planning process and they got away with nobody noticing or caring for 6 years; or
- before the area became a conservation area; or
- before the planning laws were revised; or
- before an Article 4 direction was put in place.
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