Denton house extensions
We design and build house extensions for homes in Denton and the surrounding Greater Manchester area, with guide prices adjusted for the region.
- Postcode districtsM18, M34, M43, OL7, SK5, SK16
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Site visitFree, no obligation
Do extensions in Denton 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).
Where we work near Denton
Our survey diary covers Denton, including M18, M34, M43, OL7, SK5, SK16. We also work in nearby Hyde (2 miles), Dukinfield (2 miles), Droylsden (2 miles), Ashton-under-Lyne (2 miles), Stalybridge (3 miles). Just over the Cheshire border, Wilmslow is about 10 miles away.
What works best for Denton houses?
The North West has a high share of Victorian and Edwardian terraces with rear yards and outriggers, plus large areas of inter-war semis in the suburbs.
Depending on the plot, side return extensions and kitchen extensions are often the strongest options, with single-storey rear extensions worth considering where there is room.
Denton extension prices at a glance
We publish guide prices so you can budget before anyone visits. For Denton they are adjusted by ×0.95, the factor we use across North West England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Wraparound extensions | 25 m² | £54,500 – £69,000 |
| Kitchen extensions | 20 m² | £39,500 – £50,500 |
| Orangery extensions | 16 m² | £42,500 – £53,500 |
| Single-storey rear extensions | 20 m² | £38,500 – £49,500 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
| Extensions over a garage | 12 m² | £23,500 – £31,000 |
Extension types and starting prices
- Annexe extensions · from £52,000
- Bedroom extensions · from £24,500
- Porch extensions · from £3,800
- Conservatory replacement extensions · from £19,000
- Utility and boot room extensions · from £13,000
- Extensions over a garage · from £22,500
- Bungalow extensions · from £24,500
- Wraparound extensions · from £34,000
- Flat roof extensions · from £19,500
- Double-storey extensions · from £36,000
- Glass box extensions · from £28,500
- Orangery extensions · from £28,500
- Home office extensions · from £15,000
- Pitched roof extensions · from £21,000
- Building regulations for extensions · from £850
- Planning permission for extensions · from £300
- Timber frame extensions · from £19,500
- Single-storey rear extensions · from £19,500
- Kitchen extensions · from £25,500
- Extension plans and drawings · from £1,100
- Side return extensions · from £17,000
- Side extensions · from £20,500
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
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 Denton
How much does an extension cost in Denton?
Using our North West England factor (×0.95), a standard-spec single-storey extension of 20 m² is a guide £38,500 to £49,500 including VAT, and a 32 m² two-storey extension £54,500 to £71,500. Your written price follows the survey.
Do I need planning permission for an extension in Denton?
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.
How long does an extension take in Denton?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Denton, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Denton
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.