Extensions in Northallerton: design, planning and build
We design and build house extensions for homes in Northallerton and the surrounding North Yorkshire area, with guide prices adjusted for the region.
- Postcode districtsDL7
- Price regionYorkshire and the Humber (×0.94)
- Planning rulesEngland
- Site visitFree, no obligation
Covering Northallerton and nearby
Site visits are available across Northallerton (DL7). We also work in nearby Ripon (13 miles), Middlesbrough (19 miles), Harrogate (24 miles), Redcar (26 miles), York (31 miles). Just over the County Durham border, Yarm is about 13 miles away.
Approvals for an extension in Northallerton
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 return infill is often permitted development if it stays within the height limits and is no wider than half the width of the original house. Conservation areas, listed buildings and flats always need an application, and the boundary wall usually brings in the Party Wall Act.
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).
What extensions cost in Northallerton
Use these Northallerton guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Kitchen extensions | 20 m² | £39,000 – £50,000 |
| Side return extensions | 11 m² | £24,500 – £31,500 |
| Double-storey extensions | 32 m² | £54,000 – £71,000 |
| Orangery extensions | 16 m² | £42,000 – £53,000 |
| Wraparound extensions | 25 m² | £54,000 – £68,500 |
| Single-storey rear extensions | 20 m² | £38,500 – £49,000 |
| Conservatory replacement extensions | 14 m² | £28,000 – £36,500 |
What works best for Northallerton houses?
Homes across Yorkshire and the Humber range from back-to-back and through terraces to large suburban semis, and extension options vary with them.
Start by comparing single-storey rear extensions, side return extensions and double-storey extensions: between them they cover most of the layouts we see requested for houses like these.
Every extension type in Northallerton
- Planning permission for extensions · from £300
- Single-storey rear extensions · from £19,500
- Pitched roof extensions · from £20,500
- Timber frame extensions · from £19,500
- Conservatory replacement extensions · from £18,500
- Side extensions · from £20,500
- Annexe extensions · from £51,500
- Home office extensions · from £15,000
- Glass box extensions · from £28,000
- Orangery extensions · from £28,000
- Double-storey extensions · from £35,500
- Porch extensions · from £3,750
- Kitchen extensions · from £25,000
- Extensions over a garage · from £22,500
- Bedroom extensions · from £24,000
- Utility and boot room extensions · from £13,000
- Extension plans and drawings · from £1,100
- Wraparound extensions · from £33,500
- Side return extensions · from £16,500
- Flat roof extensions · from £19,500
- Building regulations for extensions · from £800
- Bungalow extensions · from £24,500
Free site visit
We visit your Northallerton home, measure up, talk through what you want and check the planning position.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
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 Northallerton
How much does an extension cost in Northallerton?
Using our Yorkshire and the Humber factor (×0.94), a standard-spec single-storey extension of 20 m² is a guide £38,500 to £49,000 including VAT, and a 32 m² two-storey extension £54,000 to £71,000. Your written price follows the survey.
How long does an extension take in Northallerton?
Usually 2 to 4 months of design and approvals, then 10 to 16 weeks on site for a single-storey extension or 16 to 24 weeks for two storeys.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Northallerton, and the guide-price tool gives a range for your own size and finish in about a minute.
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.
Book a free site visit in Northallerton
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.