Greenford house extensions
We design and build house extensions for homes in Greenford and the surrounding Greater London area, with guide prices adjusted for the region.
- Postcode districtsUB1, UB4, UB5, UB6, W7, W13
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Covering Greenford and nearby
Postcode districts we cover around Greenford include UB1, UB4, UB5, UB6, W7, W13. Nearby, we also take on projects in Northolt (1 mile), Southall (2 miles), South Ruislip (3 miles), Wembley (3 miles), Hayes (Hillingdon) (3 miles). Just over the Hertfordshire border, Bushey is about 8 miles away.
Approvals for an extension in Greenford
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).
What works best for Greenford houses?
In London, space is at a premium and gardens are often short, so side returns, wraparounds and carefully planned rear extensions tend to make the most of every metre.
For many houses here, kitchen extensions, glass box extensions or wraparound extensions gives the most useful space for the budget.
Popular extension prices in Greenford
Every figure below is a guide for Greenford, adjusted for London build costs (×1.3) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
All extension types we build in Greenford
- Bungalow extensions · from £34,000
- Side extensions · from £28,500
- Home office extensions · from £20,500
- Utility and boot room extensions · from £18,000
- Conservatory replacement extensions · from £26,000
- Extension plans and drawings · from £1,550
- Building regulations for extensions · from £1,150
- Double-storey extensions · from £49,000
- Wraparound extensions · from £46,500
- Side return extensions · from £23,000
- Extensions over a garage · from £31,000
- Annexe extensions · from £71,500
- Single-storey rear extensions · from £27,000
- Planning permission for extensions · from £450
- Timber frame extensions · from £27,000
- Pitched roof extensions · from £28,500
- Kitchen extensions · from £35,000
- Flat roof extensions · from £27,000
- Porch extensions · from £5,200
- Glass box extensions · from £39,000
- Bedroom extensions · from £33,500
- Orangery extensions · from £39,000
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
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 Greenford
How much does an extension cost in Greenford?
Using our London factor (×1.3), a standard-spec single-storey extension of 20 m² is a guide £53,000 to £68,000 including VAT, and a 32 m² two-storey extension £74,500 to £98,000. 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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Greenford, 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 Greenford?
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.
Book a free site visit in Greenford
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.