House extensions in Castleford
Planning an extension in Castleford? Compare extension types, see guide prices adjusted for Castleford and book a free site visit.
- Postcode districtsWF6, WF10
- Price regionYorkshire and the Humber (×0.94)
- Planning rulesEngland
- Site visitFree, no obligation
Planning and building control in Castleford
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).
What works best for Castleford 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.
For many houses here, double-storey extensions, pitched roof extensions or side return extensions gives the most useful space for the budget.
What extensions cost in Castleford
Prices on this page use our Yorkshire and the Humber factor of ×0.94, include VAT at 20% and cover the build; your written price follows a survey and agreed drawings.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Kitchen extensions | 20 m² | £39,000 – £50,000 |
| 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 |
| Side return extensions | 11 m² | £24,500 – £31,500 |
| Orangery extensions | 16 m² | £42,000 – £53,000 |
| Extensions over a garage | 12 m² | £23,500 – £30,500 |
Where we work near Castleford
Postcode districts we cover around Castleford include WF6, WF10. Neighbouring towns we cover include Pontefract (3 miles), Wakefield (6 miles), Leeds (9 miles), Ossett (9 miles), South Elmsall (10 miles). Darton, in South Yorkshire, is roughly 12 miles from Castleford and also on our list.
All extension types we build in Castleford
- Extensions over a garage · from £22,500
- Annexe extensions · from £51,500
- Double-storey extensions · from £35,500
- Single-storey rear extensions · from £19,500
- Wraparound extensions · from £33,500
- Pitched roof extensions · from £20,500
- Orangery extensions · from £28,000
- Timber frame extensions · from £19,500
- Glass box extensions · from £28,000
- Kitchen extensions · from £25,000
- Side extensions · from £20,500
- Side return extensions · from £16,500
- Extension plans and drawings · from £1,100
- Bungalow extensions · from £24,500
- Porch extensions · from £3,750
- Flat roof extensions · from £19,500
- Home office extensions · from £15,000
- Planning permission for extensions · from £300
- Bedroom extensions · from £24,000
- Utility and boot room extensions · from £13,000
- Conservatory replacement extensions · from £18,500
- Building regulations for extensions · from £800
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
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
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in Castleford
How much does an extension cost in Castleford?
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.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Do you cover all of Castleford?
Yes, including the surrounding parts of West Yorkshire. Site visits are free and there is no obligation.
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Castleford, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Castleford
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.