Side return extensions in Thamesmead

Covering Thamesmead

We work in Thamesmead (SE2, SE28) and the places around it, including Barking, Welling and Becontree.

Homes in London

London projects often mean working on period terraces with neighbours on both sides, tight access through the house and conservation area controls, so careful planning and party wall work matter as much as the build.

What goes into a side return extension?

Side returns are small in area but heavy in detail: party walls, a glazed roof, and steelwork to take out the original back wall. We design the roof for light and drainage, agree the party wall process early, and keep the work tidy because access is often through the house.

Party wall notices and surveyor liaison
Drainage and new gully positions
Underfloor heating ready screed if wanted

What will a side return extension cost?

Use these ranges to budget for side return extensions; the survey turns them into a fixed price for the agreed specification.

Side return extensions	Guide price incl. VAT
Standard specification	£3,350 to £3,700 per m²
Good specification	£3,700 to £4,150 per m²
High specification	£4,150 to £4,550 per m²

Planning and building rules in Thamesmead

English projects need planning clearance from the local council, building regulations sign-off from building control, and party wall notices where the work is on or near a shared boundary. We prepare and manage all three.

In England a single-storey rear extension can often go ahead under permitted development: up to 3 m deep on an attached house or 4 m on a detached one, no higher than 4 m, with eaves no higher than 3 m within 2 m of a boundary. Deeper extensions, up to 6 m or 8 m, need prior approval from the council first.

What can change the price or programme?

Glazed roofs need careful detailing against the neighbour’s wall.
Many terraces sit in conservation areas, where side extensions need planning permission.

From first call to completion

Start with a conversation. A short call or the online form is enough for us to understand what you want to build.
We visit and measure. A surveyor checks the house, the boundaries and the ground, and discusses what is realistic.
Drawings, approvals, written quote. We prepare the design, apply for the approvals it needs, and give you a fixed price in writing.
Construction and completion. One site lead co-ordinates every trade through to the building control certificate.

Questions about a side return extension in Thamesmead

How much does a side return extension cost?

Usually about £3,350 to £4,550 per square metre including VAT, which works out at around £35,000 to £55,000 for a typical side return before the kitchen.

Will I need a party wall agreement?

Most likely, because the new wall usually sits on or near the boundary. We serve the notices and work with your neighbour’s surveyor if one is appointed.

How do I get a price for side return extensions in Thamesmead?

Use the guide price tool for a ballpark figure, then book a visit for a fixed written price for the agreed specification.

Side return extensions near Thamesmead

Learn more about side return extensions, or see every project we cover in Thamesmead.