Wraparound extensions in Seaham
If you live in Seaham and want more space without moving, a wraparound extension is one of the most practical ways to get it. We handle the drawings, approvals and the build.
- Guide price in SeahamFrom £32,500 inc VAT
- PlanningUsually a householder application
- Build time14–20 weeks on site
- Postcode districtsSR7
What is included
- Foundations, drainage and any manhole relocation
- Party wall notice support (England and Wales)
- Structural design for the corner and openings
- Roof with glazing along the side return
- Full internal finish or kitchen-ready shell
Guide prices for Seaham
These guide figures apply our North East England adjustment (×0.91) to national rates. They include VAT at 20% and cover the build itself; design and council fees are listed separately.
Typical rates in Seaham: £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.
Extensions in and around Seaham
We cover Seaham and the postcode districts SR7. The same team covers Peterlee (5 miles), Chester-le-Street (9 miles), Durham (10 miles), Hartlepool (12 miles), all within easy reach.
Just over the Tyne and Wear border, Houghton-le-Spring is about 5 miles away. Across the North East, houses often have rear yards or modest gardens, so compact, well-lit single-storey extensions make the biggest difference.
Planning and approvals in Seaham
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).
The planning position for a specific Seaham address depends on its history and any designations, which is why we check it at the first visit.
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).
Our process, step by step
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
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
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
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Wraparound extension questions answered
Who do I contract with for a wraparound extension in Seaham?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
Will my neighbours in Seaham be involved?
If a planning application or prior approval is needed, the council notifies neighbours. If the work is on or near a shared boundary, party wall notices may also be needed.
Can I see a price before committing to anything?
Yes. The guide prices on this page are adjusted for Seaham, and the guide-price tool gives a range for your own size. After the survey you get a written price before anything is agreed.
Is a wraparound better than a side return alone?
It adds far more space, but costs more and needs planning permission more often. Our comparison guide sets the two side by side.
Will I need to move a drain?
Often. Side returns frequently contain a manhole or a shared drain. Building near or over a public sewer needs the water company’s consent in England and Wales, which we arrange.
Book a free site visit in Seaham
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.