House extensions in Mirfield
We design and build house extensions for homes in Mirfield and the surrounding West Yorkshire area, with guide prices adjusted for the region.
- Postcode districtsWF14
- Price regionYorkshire and the Humber (×0.94)
- Planning rulesEngland
- Site visitFree, no obligation
Approvals for an extension in Mirfield
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).
Popular extension prices in Mirfield
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) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £28,000 – £36,500 |
| Orangery extensions | 16 m² | £42,000 – £53,000 |
| Kitchen extensions | 20 m² | £39,000 – £50,000 |
| Extensions over a garage | 12 m² | £23,500 – £30,500 |
| Side return extensions | 11 m² | £24,500 – £31,500 |
| Double-storey extensions | 32 m² | £54,000 – £71,000 |
| Wraparound extensions | 25 m² | £54,000 – £68,500 |
Where we work near Mirfield
Site visits are available across Mirfield (WF14). We also work in nearby Liversedge (2 miles), Heckmondwike (2 miles), Dewsbury (3 miles), Batley (3 miles), Cleckheaton (4 miles). Darton, in South Yorkshire, is roughly 9 miles from Mirfield and also on our list.
What works best for Mirfield 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.
Depending on the plot, double-storey extensions and side return extensions are often the strongest options, with single-storey rear extensions worth considering where there is room.
Choose an extension type
- Wraparound extensions · from £33,500
- Side extensions · from £20,500
- Timber frame extensions · from £19,500
- Bedroom extensions · from £24,000
- Conservatory replacement extensions · from £18,500
- Side return extensions · from £16,500
- Kitchen extensions · from £25,000
- Annexe extensions · from £51,500
- Orangery extensions · from £28,000
- Double-storey extensions · from £35,500
- Flat roof extensions · from £19,500
- Building regulations for extensions · from £800
- Single-storey rear extensions · from £19,500
- Extensions over a garage · from £22,500
- Extension plans and drawings · from £1,100
- Porch extensions · from £3,750
- Pitched roof extensions · from £20,500
- Utility and boot room extensions · from £13,000
- Home office extensions · from £15,000
- Planning permission for extensions · from £300
- Glass box extensions · from £28,000
- Bungalow extensions · from £24,500
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
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 Mirfield
How much does an extension cost in Mirfield?
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.
How long does an extension take in Mirfield?
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 Mirfield
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.