By Borough
Side Return Extension Drawings by London Council
Borough-by-borough guidance on side return extension drawings — local conservation areas, Article 4 directions and validation quirks for each council.
Southwark
London Borough of SouthwarkWaltham Forest
London Borough of Waltham ForestHackney
London Borough of HackneyHaringey
London Borough of HaringeyGreenwich
Royal Borough of GreenwichLewisham
London Borough of LewishamSutton
London Borough of SuttonNewham
London Borough of NewhamBexley
London Borough of BexleyBarking & Dagenham
London Borough of Barking and Dagenham
London Borough of SouthwarkWaltham Forest
London Borough of Waltham ForestHackney
London Borough of HackneyHaringey
London Borough of HaringeyGreenwich
Royal Borough of GreenwichLewisham
London Borough of LewishamSutton
London Borough of SuttonNewham
London Borough of NewhamBexley
London Borough of BexleyBarking & Dagenham
London Borough of Barking and Dagenham
Side Return Extension Drawings guides that apply in every borough
These are the same in all 33 councils, so they are worth reading once rather than borough by borough.