Newton Aycliffe, County Durham
Semi-detached rear extension in Newton Aycliffe
Single or two-storey extensions for semi-detached houses, with side access and one party wall. If you live in Newton Aycliffe and want to know what a semi-detached rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Newton Aycliffe sits in County Durham, with postcode districts including DL4 and DL5. Where a Newton Aycliffe semi already has a small lean-to at the back, we usually replace it rather than extend it.
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 Newton Aycliffe?
A semi-detached rear extension in Newton Aycliffe 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 |
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 Newton Aycliffe?
Here is how the rules in England apply to a semi-detached rear extension in Newton Aycliffe.
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.
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. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.
What are homes in Newton Aycliffe like to extend?
Terraces and semis are typical around Newton Aycliffe. On terraces a single-storey rear extension across the back yard is usually the practical choice; semis often have room for more.
How a semi-detached rear extension in Newton Aycliffe comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
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 Newton Aycliffe
Close by, we work in Bishop Auckland, about 4.9 miles away, and Spennymoor, about 5.7 miles away.
- Semi-detached rear extension in Bishop Auckland
- Semi-detached rear extension in Spennymoor
- Semi-detached rear extension in Darlington
- Semi-detached rear extension in Stockton-on-Tees
- Semi-detached rear extension in Durham
Other work in Newton Aycliffe:
FAQ
Semi-detached rear extension questions in Newton Aycliffe
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.
What postcode areas do you cover around Newton Aycliffe?
Including DL4 and DL5, and the surrounding County Durham area.
Single or two-storey on a semi?
Two-storey if you need bedrooms, single-storey if you need a bigger kitchen. Planning risk is lower for single-storey.
Do I need planning permission for a rear extension in Newton Aycliffe?
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 you match the brick or stone on my Newton Aycliffe house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Do you handle building control in Newton Aycliffe?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.