Extending your home in Billingham
We design and build house extensions for homes in Billingham and the surrounding County Durham area, with guide prices adjusted for the region.
- Postcode districtsTS18, TS19, TS20, TS22, TS23
- Price regionNorth East England (×0.91)
- Planning rulesEngland
- Site visitFree, no obligation
Billingham extension prices at a glance
Prices on this page use our North East England factor of ×0.91, include VAT at 20% and cover the build; your written price follows a survey and agreed drawings.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Extensions over a garage | 12 m² | £22,500 – £29,500 |
| Conservatory replacement extensions | 14 m² | £27,000 – £35,500 |
| Kitchen extensions | 20 m² | £38,000 – £48,500 |
| Double-storey extensions | 32 m² | £52,000 – £68,500 |
| Side return extensions | 11 m² | £24,000 – £30,500 |
| Wraparound extensions | 25 m² | £52,000 – £66,000 |
Do extensions in Billingham 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.
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 works best for Billingham houses?
The North East has many brick terraces, colliery-era housing and post-war semis, with rear extensions and kitchen extensions the most common requests.
The types we would usually look at first for a home in Billingham are kitchen extensions, single-storey rear extensions and double-storey extensions, depending on the garden and how the house is laid out.
Areas we cover around Billingham
Across TS18, TS19, TS20, TS22, TS23, we can visit, measure and advise. Nearby, we also take on projects in Stockton-on-Tees (2 miles), Thornaby-on-Tees (4 miles), Yarm (6 miles), Hartlepool (7 miles), Darlington (11 miles). Just over the North Yorkshire border, Middlesbrough is about 2 miles away.
All extension types we build in Billingham
- Side return extensions · from £16,000
- Double-storey extensions · from £34,500
- Glass box extensions · from £27,000
- Bungalow extensions · from £23,500
- Extensions over a garage · from £21,500
- Side extensions · from £20,000
- Orangery extensions · from £27,000
- Utility and boot room extensions · from £12,500
- Wraparound extensions · from £32,500
- Porch extensions · from £3,600
- Bedroom extensions · from £23,500
- Annexe extensions · from £50,000
- Home office extensions · from £14,500
- Kitchen extensions · from £24,500
- Timber frame extensions · from £19,000
- Pitched roof extensions · from £20,000
- Extension plans and drawings · from £1,050
- Flat roof extensions · from £19,000
- Conservatory replacement extensions · from £18,000
- Single-storey rear extensions · from £19,000
- Building regulations for extensions · from £800
- Planning permission for extensions · from £300
Free site visit
We visit your Billingham 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
With the design and specification agreed, you get a fixed written price and a start date.
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 Billingham
How much does an extension cost in Billingham?
Using our North East England factor (×0.91), a standard-spec single-storey extension of 20 m² is a guide £37,000 to £47,500 including VAT, and a 32 m² two-storey extension £52,000 to £68,500. Your written price follows the survey.
How long does an extension take in Billingham?
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.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
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 Billingham
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.