House extensions in Welling
Looking to extend your home in Welling? Start here: extension types, guide prices for Welling, the planning rules that apply and how a project runs.
- Postcode districtsDA6, DA7, DA15, DA16, SE2, SE18
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Welling extension prices at a glance
Use these Welling 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) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
Do extensions in Welling 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 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).
Areas we cover around Welling
Our survey diary covers Welling, including DA6, DA7, DA15, DA16, SE2, SE18. The same team covers Abbey Wood (2 miles), Plumstead (2 miles), Bexley (2 miles), Eltham (3 miles), Thamesmead (3 miles), all within easy reach. Just over the Kent border, Dartford is about 5 miles away.
Which extension suits a Welling home?
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.
The types we would usually look at first for a home in Welling are side return extensions, glass box extensions and kitchen extensions, depending on the garden and how the house is laid out.
Choose an extension type
- Extension plans and drawings · from £1,550
- Home office extensions · from £20,500
- Bedroom extensions · from £33,500
- Pitched roof extensions · from £28,500
- Porch extensions · from £5,200
- Extensions over a garage · from £31,000
- Bungalow extensions · from £34,000
- Timber frame extensions · from £27,000
- Utility and boot room extensions · from £18,000
- Annexe extensions · from £71,500
- Side extensions · from £28,500
- Double-storey extensions · from £49,000
- Conservatory replacement extensions · from £26,000
- Side return extensions · from £23,000
- Glass box extensions · from £39,000
- Building regulations for extensions · from £1,150
- Orangery extensions · from £39,000
- Single-storey rear extensions · from £27,000
- Planning permission for extensions · from £450
- Flat roof extensions · from £27,000
- Kitchen extensions · from £35,000
- Wraparound extensions · from £46,500
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
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
With the design and specification agreed, you get a fixed written price and a start date.
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 Welling
How much does an extension cost in Welling?
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 Welling?
Yes, including the surrounding parts of Greater London. Site visits are free and there is no obligation.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Welling, and the guide-price tool gives a range for your own size and finish in about a minute.
Do I need planning permission for an extension in Welling?
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.
Book a free site visit in Welling
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.