York house extensions
Planning an extension in York? Compare extension types, see guide prices adjusted for York and book a free site visit.
- Postcode districtsYO1, YO10, YO23, YO24, YO30, YO31
- Price regionYorkshire and the Humber (×0.94)
- Planning rulesEngland
- Site visitFree, no obligation
Areas we cover around York
We cover York and the postcode districts YO1, YO10, YO23, YO24, YO30, YO31. Nearby, we also take on projects in Selby (12 miles), Harrogate (19 miles), Ripon (24 miles), Northallerton (31 miles), Scarborough (35 miles). Goole, in East Riding of Yorkshire, is roughly 19 miles from York and also on our list.
York extension prices at a glance
Use these York 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) |
|---|---|---|
| Single-storey rear extensions | 20 m² | £38,500 – £49,000 |
| Orangery extensions | 16 m² | £42,000 – £53,000 |
| Double-storey extensions | 32 m² | £54,000 – £71,000 |
| Kitchen extensions | 20 m² | £39,000 – £50,000 |
| Conservatory replacement extensions | 14 m² | £28,000 – £36,500 |
What works best for York houses?
Yorkshire and the Humber combines stone-built terraces in the Pennine towns with brick semis and newer estates elsewhere, so materials and roof details need matching with care.
Depending on the plot, side return extensions and single-storey rear extensions are often the strongest options, with pitched roof extensions worth considering where there is room.
Planning and building control in York
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.
If the work involves a shared wall, building on the boundary, or digging foundations within 3 m (sometimes 6 m) of a neighbour's building, the Party Wall etc. Act 1996 applies and notice must be served before work starts: two months for work to a party wall, one month for new walls on the boundary and for excavations.
Applications are decided by the local planning authority (your district, borough or unitary council).
Choose an extension type
- Pitched roof extensions · from £20,500
- Glass box extensions · from £28,000
- Extension plans and drawings · from £1,100
- Orangery extensions · from £28,000
- Kitchen extensions · from £25,000
- Building regulations for extensions · from £800
- Flat roof extensions · from £19,500
- Annexe extensions · from £51,500
- Home office extensions · from £15,000
- Porch extensions · from £3,750
- Utility and boot room extensions · from £13,000
- Side return extensions · from £16,500
- Bungalow extensions · from £24,500
- Side extensions · from £20,500
- Conservatory replacement extensions · from £18,500
- Single-storey rear extensions · from £19,500
- Planning permission for extensions · from £300
- Double-storey extensions · from £35,500
- Extensions over a garage · from £22,500
- Wraparound extensions · from £33,500
- Bedroom extensions · from £24,000
- Timber frame extensions · from £19,500
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 draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in York
How much does an extension cost in York?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for York, and the guide-price tool gives a range for your own size and finish in about a minute.
How long does an extension take in York?
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.
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 York
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.