Annfield Plain, County Durham
Single-storey rear extension in Annfield Plain
Single-storey rear extension in Annfield Plain: ground-floor space across the back of the house, usually for a kitchen, dining or family room. We measure the house, show you what the rules allow, price it in writing and build it.
Annfield Plain is covered from our County Durham round, including DH9. A single-storey rear extension in Annfield Plain is mostly built from the garden side, so the house stays usable for most of the job.
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 single-storey rear extension cost in Annfield Plain?
A single-storey rear extension in Annfield Plain is priced at £1,710–£2,790 per square metre including VAT as a guide, before kitchen fit-out and fees. 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a single-storey rear extension in Annfield Plain?
Whether your single-storey rear extension in Annfield Plain needs a planning application depends on its size, your house and any local restrictions.
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
If 3 or 4 metres is not enough, England's prior approval route allows 6 metres on a terraced or semi-detached house and 8 metres on a detached house for a single-storey rear extension. Neighbours are consulted, the council decides within 42 days, and the fee is £249, rising to £310 from 8 December 2026.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Annfield Plain like to extend?
Terraces and semis are typical around Annfield Plain. On terraces a single-storey rear extension across the back yard is usually the practical choice; semis often have room for more.
How a single-storey rear extension in Annfield Plain 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.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Single-storey rear extensions near Annfield Plain
Neighbouring places we cover include Stanley (1.7 miles) and Consett (3.7 miles).
- Single-storey rear extension in Stanley
- Single-storey rear extension in Consett
- Single-storey rear extension in Chester-le-Street
- Single-storey rear extension in Whickham
- Single-storey rear extension in Blaydon-on-Tyne
Other work in Annfield Plain:
FAQ
Single-storey rear extension questions in Annfield Plain
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.
Do I need planning permission for a rear extension in Annfield Plain?
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.
Do I need a structural engineer?
Yes for the beam over the new opening and usually for the foundations. Their calculations go to building control with the drawings.
Is the site visit in Annfield Plain free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
What postcode areas do you cover around Annfield Plain?
Including DH9, and the surrounding County Durham area.
Can you match the brick or stone on my Annfield Plain house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.