Planning and building regulation drawings in Wallington (SM6)

The plots are the story. Gardens are deep and well planted, and the houses are spaced out, so rear extensions and loft conversions are common projects, generous plots allow deeper single-storey rear extensions, and some houses have room for a side extension. No conservation area is recorded against Wallington's avenues, although Sutton's borough list includes a Wallington (Woodcote) conservation area, so we confirm whether your address lies inside it. No local Article 4 direction narrows permitted development rights further, which leaves Sutton's standard limits on depth, height and roof form as the working rules.

What the council looks at instead is how an addition sits in a settled street. Sutton wants side and front-facing work judged against the pattern of the avenue, so a two-storey side extension that closes the gap between two houses can erode the spacious grain that gives these roads their character. Matching the original brick, render, tile-hanging and roof tiles matters because a new wing should read as part of the original house.

Neighbours matter too. Larger schemes still have to answer for overshadowing, overlooking and the party wall with the house next door, and mature trees are common here, so a tree preservation order or established planting near the footprint should be checked before groundworks begin.

Hackbridge, the other part of SM6, sits on the River Wandle. A former mill and industrial hamlet, it gained interwar terraces and semis and, in 2002, the BedZED eco-development, with newer riverside infill since. Senga Road, Longfield Avenue, Elm Road, New Road, Orchard Avenue, Helios Road and Sandmartin Way are among its streets. With such a mixed grain, an extension is assessed against its immediate neighbours and should match their materials and roof form, and a house close to the Wandle should have its Environment Agency flood-zone position and drainage checked before a ground-floor extension is designed.

Planning in Wallington: what to know before you apply

Sutton applies its householder design guidance to Wallington, and for houses outside any conservation area the usual permitted development limits govern extension depth, height and roof form. Where a project goes beyond those limits it needs a householder application, which is decided on its effect on the street, the original house and the neighbours. Side and front-facing additions are judged against the settled pattern of the avenue, and a two-storey side extension against the gaps between houses. Flats have no householder permitted development rights, and if an address falls inside a conservation area then roof enlargements, side extensions and rear extensions of more than one storey are not permitted development either. Each application needs scaled drawings, a location plan and the correct ownership certificate or notice.

Applications are decided by London Borough of Sutton — its planning pages.