House extensions in Wealdstone
We design and build house extensions for homes in Wealdstone and the surrounding Greater London area, with guide prices adjusted for the region.
- Postcode districtsHA1, HA3, HA7
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Approvals for an extension in Wealdstone
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 return infill is often permitted development if it stays within the height limits and is no wider than half the width of the original house. Conservation areas, listed buildings and flats always need an application, and the boundary wall usually brings in the Party Wall Act.
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).
What extensions cost in Wealdstone
We publish guide prices so you can budget before anyone visits. For Wealdstone they are adjusted by ×1.3, the factor we use across London.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Side return extensions | 11 m² | £34,000 – £43,000 |
Where we work near Wealdstone
Site visits are available across Wealdstone (HA1, HA3, HA7). Neighbouring towns we cover include Harrow (1 mile), Pinner (2 miles), Wembley (4 miles), Northolt (4 miles), Ruislip (4 miles). Just over the Hertfordshire border, Bushey is about 3 miles away.
Choosing the right extension in Wealdstone
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, wraparound extensions, glass box extensions or kitchen extensions gives the most useful space for the budget.
Choose an extension type
- Single-storey rear extensions · from £27,000
- Home office extensions · from £20,500
- Bedroom extensions · from £33,500
- Timber frame extensions · from £27,000
- Building regulations for extensions · from £1,150
- Utility and boot room extensions · from £18,000
- Extension plans and drawings · from £1,550
- Side return extensions · from £23,000
- Side extensions · from £28,500
- Pitched roof extensions · from £28,500
- Flat roof extensions · from £27,000
- Double-storey extensions · from £49,000
- Conservatory replacement extensions · from £26,000
- Extensions over a garage · from £31,000
- Glass box extensions · from £39,000
- Bungalow extensions · from £34,000
- Orangery extensions · from £39,000
- Kitchen extensions · from £35,000
- Planning permission for extensions · from £450
- Annexe extensions · from £71,500
- Porch extensions · from £5,200
- Wraparound extensions · from £46,500
Free site visit
We visit your Wealdstone home, measure up, talk through what you want and check the planning position.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
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 Wealdstone
How much does an extension cost in Wealdstone?
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.
Do I need planning permission for an extension in Wealdstone?
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.
Do you cover all of Wealdstone?
Yes, including the surrounding parts of Greater London. Site visits are free and there is no obligation.
Book a free site visit in Wealdstone
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.