Berwick-upon-Tweed, Northumberland
Semi-detached rear extension in Berwick-upon-Tweed
We plan and build rear extensions for semi-detached houses for homeowners in Berwick-upon-Tweed. Single or two-storey extensions for semi-detached houses, with side access and one party wall. Start with a free site visit, then a written price once the design is agreed.
Berwick-upon-Tweed and its postcode districts TD15 are part of our Northumberland coverage. Semi-detached houses are common across Northumberland, and their side access makes rear extensions quicker to build.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a semi-detached rear extension cost in Berwick-upon-Tweed?
Guide prices for a semi-detached rear extension in Berwick-upon-Tweed start from our North East England rate of £1,710–£2,790 per square metre, including VAT. North East prices are among the lowest in our range; former mining ground is the main foundation variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £20,500–£33,500 |
| 4 m wide × 5 m deep (20 m²) | £34,000–£56,000 |
| 4 m wide × 6 m deep (24 m²) | £41,000–£67,000 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a semi-detached rear extension in Berwick-upon-Tweed?
The planning route for a semi-detached rear extension in Berwick-upon-Tweed is set by England's householder rules and your council.
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres within 2 metres of a boundary.
England's rules allow a rear extension of more than one storey without an application only when it is no deeper than 3 metres and at least 7 metres from the boundary opposite the rear wall, and never on designated land. Most two-storey schemes need householder planning permission.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Berwick-upon-Tweed like to extend?
Brick terraces, colliery houses and post-war semis make up much of Berwick-upon-Tweed. Former mining areas often need a coal mining risk check before foundations are designed.
How a semi-detached rear extension in Berwick-upon-Tweed comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Semi-detached rear extensions near Berwick-upon-Tweed
Neighbouring places we cover include Kelso (20.4 miles) and Dunbar (25.4 miles).
- Semi-detached rear extension in Kelso
- Semi-detached rear extension in Dunbar
- Semi-detached rear extension in Galashiels
- Semi-detached rear extension in Selkirk
- Semi-detached rear extension in Tranent
Other work in Berwick-upon-Tweed:
FAQ
Semi-detached rear extension questions in Berwick-upon-Tweed
How much does a semi-detached rear extension cost in Berwick-upon-Tweed?
As a guide, £1,710–£2,790 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £20,500–£33,500 at that rate. Your written price follows the survey.
What postcode areas do you cover around Berwick-upon-Tweed?
Including TD15, and the surrounding Northumberland area.
What if my neighbour has already extended?
That can make a matching depth easier to justify. We measure theirs at the survey.
How long does a rear extension take to build in Berwick-upon-Tweed?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Do I need planning permission for a rear extension in Berwick-upon-Tweed?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.