Extensions in Alnwick: design, planning and build
Planning an extension in Alnwick? Compare extension types, see guide prices adjusted for Alnwick and book a free site visit.
- Postcode districtsNE66
- Price regionNorth East England (×0.91)
- Planning rulesEngland
- Site visitFree, no obligation
Where we work near Alnwick
Site visits are available across Alnwick (NE66). Nearby, we also take on projects in Morpeth (17 miles), Ashington (19 miles), Bedlington (21 miles), Blyth (23 miles), Cramlington (24 miles). For homes towards Tyne and Wear, Whitley Bay is around 29 miles away.
Which extension suits a Alnwick 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.
Depending on the plot, utility and boot room extensions and kitchen extensions are often the strongest options, with double-storey extensions worth considering where there is room.
What extensions cost in Alnwick
We publish guide prices so you can budget before anyone visits. For Alnwick they are adjusted by ×0.91, the factor we use across North East England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Wraparound extensions | 25 m² | £52,000 – £66,000 |
| Orangery extensions | 16 m² | £40,500 – £51,000 |
| Double-storey extensions | 32 m² | £52,000 – £68,500 |
| Single-storey rear extensions | 20 m² | £37,000 – £47,500 |
| Side return extensions | 11 m² | £24,000 – £30,500 |
| Conservatory replacement extensions | 14 m² | £27,000 – £35,500 |
| Kitchen extensions | 20 m² | £38,000 – £48,500 |
Do extensions in Alnwick need planning permission?
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 single-storey side extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house. Two-storey side extensions, and any side extension on designated land such as a conservation area, need a householder planning application.
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).
All extension types we build in Alnwick
- Extensions over a garage · from £21,500
- Orangery extensions · from £27,000
- Side return extensions · from £16,000
- Bedroom extensions · from £23,500
- Home office extensions · from £14,500
- Timber frame extensions · from £19,000
- Conservatory replacement extensions · from £18,000
- Side extensions · from £20,000
- Kitchen extensions · from £24,500
- Extension plans and drawings · from £1,050
- Building regulations for extensions · from £800
- Annexe extensions · from £50,000
- Planning permission for extensions · from £300
- Porch extensions · from £3,600
- Double-storey extensions · from £34,500
- Wraparound extensions · from £32,500
- Utility and boot room extensions · from £12,500
- Bungalow extensions · from £23,500
- Pitched roof extensions · from £20,000
- Single-storey rear extensions · from £19,000
- Flat roof extensions · from £19,000
- Glass box extensions · from £27,000
Free site visit
We visit your Alnwick home, measure up, talk through what you want and check the planning position.
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 Alnwick
How much does an extension cost in Alnwick?
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.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
Do I need planning permission for an extension in Alnwick?
Not always. It depends on the size, position and your property's history. Many single-storey rear extensions in England are permitted development or can use prior approval.
Do you cover all of Alnwick?
Yes, including the surrounding parts of Northumberland. Site visits are free and there is no obligation.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Book a free site visit in Alnwick
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.