House extensions in Newton Aycliffe
We design and build house extensions for homes in Newton Aycliffe and the surrounding County Durham area, with guide prices adjusted for the region.
- Postcode districtsDL5
- Price regionNorth East England (×0.91)
- Planning rulesEngland
- Site visitFree, no obligation
Planning and building control in Newton Aycliffe
In England a single-storey rear extension can usually go up to 3 m beyond the original rear wall of a semi-detached or terraced house, or 4 m on a detached house, without a planning application, provided it is no more than 4 m high, keeps eaves to 3 m within 2 m of a boundary and, with other buildings, covers no more than half the land around the original house. The larger home extension prior approval scheme raises those depths to 6 m and 8 m, with neighbours notified and a 42-day decision.
In England a two-storey rear extension is permitted development only if it projects no more than 3 m from the original rear wall, sits at least 7 m from the rear boundary, matches the roof pitch and uses obscure, non-opening side windows upstairs. Most two-storey extensions therefore go through a householder planning application, which costs £548 from 1 April 2026 and normally takes about 8 weeks.
In a conservation area, national park, National Landscape, the Broads or a World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.
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).
Where we work near Newton Aycliffe
We cover Newton Aycliffe and the postcode districts DL5. The same team covers Bishop Auckland (5 miles), Darlington (7 miles), Stockton-on-Tees (11 miles), Durham (11 miles), Billingham (11 miles), all within easy reach. Middlesbrough, in North Yorkshire, is roughly 14 miles from Newton Aycliffe and also on our list.
Popular extension prices in Newton Aycliffe
Every figure below is a guide for Newton Aycliffe, adjusted for North East England build costs (×0.91) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Single-storey rear extensions | 20 m² | £37,000 – £47,500 |
| Wraparound extensions | 25 m² | £52,000 – £66,000 |
| Extensions over a garage | 12 m² | £22,500 – £29,500 |
| Conservatory replacement extensions | 14 m² | £27,000 – £35,500 |
| Double-storey extensions | 32 m² | £52,000 – £68,500 |
| Side return extensions | 11 m² | £24,000 – £30,500 |
| Kitchen extensions | 20 m² | £38,000 – £48,500 |
Which extension suits a Newton Aycliffe home?
The North East has many brick terraces, colliery-era housing and post-war semis, with rear extensions and kitchen extensions the most common requests.
For many houses here, single-storey rear extensions, utility and boot room extensions or double-storey extensions gives the most useful space for the budget.
All extension types we build in Newton Aycliffe
- Wraparound extensions · from £32,500
- Bedroom extensions · from £23,500
- Single-storey rear extensions · from £19,000
- Glass box extensions · from £27,000
- Extension plans and drawings · from £1,050
- Home office extensions · from £14,500
- Porch extensions · from £3,600
- Timber frame extensions · from £19,000
- Side extensions · from £20,000
- Extensions over a garage · from £21,500
- Flat roof extensions · from £19,000
- Double-storey extensions · from £34,500
- Bungalow extensions · from £23,500
- Side return extensions · from £16,000
- Building regulations for extensions · from £800
- Annexe extensions · from £50,000
- Conservatory replacement extensions · from £18,000
- Orangery extensions · from £27,000
- Kitchen extensions · from £24,500
- Pitched roof extensions · from £20,000
- Utility and boot room extensions · from £12,500
- Planning permission for extensions · from £300
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
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Questions about extensions in Newton Aycliffe
How much does an extension cost in Newton Aycliffe?
Using our North East England factor (×0.91), a standard-spec single-storey extension of 20 m² is a guide £37,000 to £47,500 including VAT, and a 32 m² two-storey extension £52,000 to £68,500. Your written price follows the survey.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Who do I contract with?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Newton Aycliffe, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Newton Aycliffe
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.