Extending your home in Hook
Every type of house extension in Hook, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsKT5, KT6, KT9
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Covering Hook and nearby
Postcode districts we cover around Hook include KT5, KT6, KT9. Nearby, we also take on projects in Chessington (0 miles), Surbiton (2 miles), Worcester Park (3 miles), New Malden (3 miles), Hampton (4 miles). Just over the Surrey border, Esher is about 3 miles away.
Hook extension prices at a glance
We publish guide prices so you can budget before anyone visits. For Hook they are adjusted by ×1.3, the factor we use across London.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
Do extensions in Hook need planning permission?
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).
Which extension suits a Hook home?
London's housing is dominated by Victorian and Edwardian terraces, many with a rear outrigger and a side return, and 1930s semis in the outer boroughs. Conservation areas are common, so the planning check comes first.
For many houses here, glass box extensions, side return extensions or wraparound extensions gives the most useful space for the budget.
All extension types we build in Hook
- Timber frame extensions · from £27,000
- Side return extensions · from £23,000
- Flat roof extensions · from £27,000
- Double-storey extensions · from £49,000
- Bungalow extensions · from £34,000
- Building regulations for extensions · from £1,150
- Side extensions · from £28,500
- Orangery extensions · from £39,000
- Single-storey rear extensions · from £27,000
- Bedroom extensions · from £33,500
- Kitchen extensions · from £35,000
- Conservatory replacement extensions · from £26,000
- Annexe extensions · from £71,500
- Glass box extensions · from £39,000
- Home office extensions · from £20,500
- Wraparound extensions · from £46,500
- Planning permission for extensions · from £450
- Porch extensions · from £5,200
- Pitched roof extensions · from £28,500
- Extensions over a garage · from £31,000
- Utility and boot room extensions · from £18,000
- Extension plans and drawings · from £1,550
Free site visit
We visit your Hook home, measure up, talk through what you want and check the planning position.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
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
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Hook
How much does an extension cost in Hook?
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 I need planning permission for an extension in Hook?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Hook, 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 Hook?
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 Hook
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.