Home extensions in Hanworth
Every type of house extension in Hanworth, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsTW2, TW12, TW13, TW14
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Hanworth and surrounding towns
Our survey diary covers Hanworth, including TW2, TW12, TW13, TW14. Nearby, we also take on projects in Hampton (2 miles), Feltham (2 miles), Hounslow (3 miles), Isleworth (3 miles), Heston (3 miles). Just over the Surrey border, West Molesey is about 2 miles away.
What works best for Hanworth houses?
Across London, terraced houses with narrow side returns and tight access are the norm, which shapes everything from party wall notices to how materials reach the back garden.
Depending on the plot, wraparound extensions and kitchen extensions are often the strongest options, with glass box extensions worth considering where there is room.
What extensions cost in Hanworth
Use these Hanworth 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) |
|---|---|---|
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
Planning rules in Hanworth
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).
Extension types and starting prices
- Planning permission for extensions · from £450
- Extensions over a garage · from £31,000
- Building regulations for extensions · from £1,150
- Pitched roof extensions · from £28,500
- Wraparound extensions · from £46,500
- Bungalow extensions · from £34,000
- Orangery extensions · from £39,000
- Glass box extensions · from £39,000
- Single-storey rear extensions · from £27,000
- Double-storey extensions · from £49,000
- Bedroom extensions · from £33,500
- Kitchen extensions · from £35,000
- Side extensions · from £28,500
- Annexe extensions · from £71,500
- Conservatory replacement extensions · from £26,000
- Timber frame extensions · from £27,000
- Home office extensions · from £20,500
- Porch extensions · from £5,200
- Extension plans and drawings · from £1,550
- Flat roof extensions · from £27,000
- Utility and boot room extensions · from £18,000
- Side return extensions · from £23,000
Free site visit
We visit your Hanworth home, measure up, talk through what you want and check the planning position.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Hanworth
How much does an extension cost in Hanworth?
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 cover all of Hanworth?
Yes, including the surrounding parts of Greater London. Site visits are free and there is no obligation.
Do I need planning permission for an extension in Hanworth?
Not always. It depends on the size, position and your property's history. Many single-storey rear extensions in England are permitted development or can use prior approval.
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 Hanworth
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.