Wraparound extensions for homes in Washington
Our design and build teams take on wraparound extensions in Washington, from the first measured survey through planning and building control to the finished room.
- Guide price in WashingtonFrom £32,500 inc VAT
- PlanningUsually a householder application
- Build time14–20 weeks on site
- Postcode districtsDH4, NE9, NE10, NE37, NE38
Local to Washington
Site visits are available across Washington (DH4, NE9, NE10, NE37, NE38, SR4). The same team covers Felling (4 miles), Houghton-le-Spring (5 miles), Hebburn (5 miles), Sunderland (5 miles), all within easy reach.
For homes towards County Durham, Chester-le-Street is around 4 miles away. The North East has many brick terraces, colliery-era housing and post-war semis, with rear extensions and kitchen extensions the most common requests.
How much does a wraparound extension cost in Washington?
For Washington we adjust our national guide rates by ×0.91, the factor we use for North East England. Figures include VAT; your written quote after the survey replaces them.
Typical rates in Washington: £1,820 to £3,370 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| Compact L-shape 18 m² | £32,500 – £39,500 | £37,500 – £48,000 | £47,500 – £61,000 |
| Medium L-shape 25 m² | £45,500 – £55,000 | £52,000 – £66,000 | £65,500 – £84,500 |
| Large L-shape 32 m² | £58,000 – £70,000 | £66,500 – £84,500 | £84,000 – £108,000 |
Want a range for your exact size? The guide-price tool takes about a minute.
Included in a typical project
- Structural design for the corner and openings
- Householder planning application
- Party wall notice support (England and Wales)
- Roof with glazing along the side return
- Survey, design and 3D layout options
Planning and approvals in Washington
In England a wraparound extension is assessed as both a side and a rear extension, and the combination usually falls outside permitted development, so most need a householder planning application (£548 from 1 April 2026).
Before any drawing is finalised we check whether the house is listed, in a conservation area or subject to an Article 4 direction.
Building over or within 3 m of a public sewer needs the water company's consent, usually through a build-over agreement, before the foundations go in.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Applications are decided by the local planning authority (your district, borough or unitary council).
From first visit to completion
Site visits are free and there is no obligation. Where drawings are needed, the design stage is priced in writing before it starts.
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Wraparound extension questions answered
How long does a wraparound extension take to build in Washington?
On site, typically 14 to 20 weeks once approvals are in place. Before that, allow 8–16 weeks design and approvals.
Do I need building regulations approval in Washington?
Yes. Almost every extension needs it, whatever the planning route. We prepare the drawings and book the inspections.
Do you cover all of Washington?
Yes. We cover Washington and the surrounding parts of Tyne and Wear. Site visits are free and there is no obligation.
Do wraparound extensions need planning permission?
Usually, yes. In England the side element counts as a side extension and the rear element as a rear extension, and the combination normally falls outside permitted development. A householder application costs £548 in England from 1 April 2026.
How much does a wraparound extension cost?
Our guide range is about £1,820 to £3,370 per m² including VAT. A 25 m² standard-spec wraparound typically lands around £52,000 to £66,000 in Washington before design and council fees.
Book a free site visit in Washington
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.