Wraparound extensions in Harrow

Covering Harrow

Our coverage around Harrow (HA2) also includes Brent (2 miles to the south-east) and Wembley.

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 does a wraparound extension involve?

Because it removes two external walls, a wraparound needs careful structural design and a good plan for the corner where the steels meet. We design, apply for any permissions, build and finish the shell, and can fit the kitchen as part of the same contract.

Party wall process with both neighbours if needed
Glazing, insulation, plastering and electrics
Optional kitchen supply and installation

How much should I budget for a wraparound extension?

What wraparound extensions typically cost. These are guide ranges; the written quote for your house replaces them.

Wraparound extensions	Guide price incl. VAT
Standard specification	£3,400 to £3,800 per m²
Good specification	£3,800 to £4,250 per m²
High specification	£4,250 to £4,700 per m²

Do you need permission for a wraparound extension in Harrow?

Projects in England go through two separate checks. Planning (or confirmation that the work is permitted development) comes from the district, borough or unitary council, and building regulations approval comes from the council’s building control team or a registered building control approver. Where work touches a shared wall or digs near a neighbour’s foundations, the Party Wall etc. Act 1996 applies.

In England a wraparound extension is treated as one extension, and because it covers both the side and the rear it does not normally fit within permitted development. Most need householder planning permission, which usually takes around eight weeks once validated.

What can change the price or programme?

Both neighbours may need party wall notices.
An open-plan space this size needs a heating plan, often underfloor heating.

How does the project run?

Start with a conversation. A short call or the online form is enough for us to understand what you want to build.
Survey at your house. We look at the existing structure, services and access, and agree what the design needs to achieve.
Price and paperwork. The design is priced line by line, and we submit the planning and building control applications.
Build and hand over. Our teams build to the programme, building control inspects, and you get the completion paperwork at the end.

What people ask before starting

How long does a wraparound take?

Around 12 to 18 weeks on site after approvals.

Can we keep part of the kitchen working?

Often, by sequencing the work so the old back wall comes out last. We agree a plan with you before starting.

Can you visit a house in Harrow to quote?

Yes. After a short call we arrange a site visit to measure up and agree what the design needs to do, then send a written price.

Wraparound extensions near Harrow

Learn more about wraparound extensions, or see every project we cover in Harrow.