House extensions in Thamesmead

Covering Thamesmead and nearby

We cover Thamesmead and the postcode districts DA17, DA18, IG11, SE2, SE18, SE28. We also work in nearby Abbey Wood (1 mile), Plumstead (2 miles), Barking (3 miles), Welling (3 miles), Becontree (3 miles). Dartford, in Kent, is roughly 6 miles from Thamesmead and also on our list.

• Abbey Wood
• Plumstead
• Barking
• Welling
• Becontree

Guide prices for Thamesmead

Use these Thamesmead guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.

Do extensions in Thamesmead need planning permission?

In England a single-storey rear extension can usually go up to 3 m beyond the original rear wall of a semi-detached or terraced house, or 4 m on a detached house, without a planning application, provided it is no more than 4 m high, keeps eaves to 3 m within 2 m of a boundary and, with other buildings, covers no more than half the land around the original house. The larger home extension prior approval scheme raises those depths to 6 m and 8 m, with neighbours notified and a 42-day decision.

In England a single-storey side return infill is often permitted development if it stays within the height limits and is no wider than half the width of the original house. Conservation areas, listed buildings and flats always need an application, and the boundary wall usually brings in the Party Wall Act.

In a conservation area, national park, National Landscape, the Broads or a World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.

If the work involves a shared wall, building on the boundary, or digging foundations within 3 m (sometimes 6 m) of a neighbour's building, the Party Wall etc. Act 1996 applies and notice must be served before work starts: two months for work to a party wall, one month for new walls on the boundary and for excavations.

Applications are decided by the local planning authority (your district, borough or unitary council).

Which extension suits a Thamesmead home?

Across London, terraced houses with narrow side returns and tight access are the norm, which shapes everything from party wall notices to how materials reach the back garden.

Start by comparing side return extensions, kitchen extensions and glass box extensions: between them they cover most of the layouts we see requested for houses like these.