House extensions in Plymouth
Planning an extension in Plymouth? Compare extension types, see guide prices adjusted for Plymouth and book a free site visit.
- Postcode districtsPL1, PL2, PL3, PL4, PL5, PL9
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
Where we work near Plymouth
Postcode districts we cover around Plymouth include PL1, PL2, PL3, PL4, PL5, PL9. Neighbouring towns we cover include Paignton (26 miles), Newton Abbot (26 miles), Torquay (28 miles), Exeter (36 miles), Exmouth (37 miles). For homes towards Cornwall, Launceston is around 21 miles away.
What extensions cost in Plymouth
Prices on this page use our South West England factor of ×1.02, 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) |
|---|---|---|
| Single-storey rear extensions | 20 m² | £41,500 – £53,500 |
| Kitchen extensions | 20 m² | £42,500 – £54,500 |
| Wraparound extensions | 25 m² | £58,500 – £74,000 |
| Orangery extensions | 16 m² | £45,500 – £57,500 |
| Double-storey extensions | 32 m² | £58,500 – £77,000 |
| Side return extensions | 11 m² | £26,500 – £34,000 |
| Conservatory replacement extensions | 14 m² | £30,500 – £39,500 |
Choosing the right extension in Plymouth
South West homes range from terraced streets in the cities to stone cottages and bungalows in the countryside, and conservation areas are common in historic centres.
For many houses here, annexe extensions, orangery extensions or single-storey rear extensions gives the most useful space for the budget.
Planning and building control in Plymouth
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).
Every extension type in Plymouth
- Conservatory replacement extensions · from £20,000
- Orangery extensions · from £30,500
- Flat roof extensions · from £21,000
- Single-storey rear extensions · from £21,000
- Annexe extensions · from £56,000
- Extension plans and drawings · from £1,200
- Bedroom extensions · from £26,500
- Building regulations for extensions · from £900
- Wraparound extensions · from £36,500
- Pitched roof extensions · from £22,500
- Utility and boot room extensions · from £14,000
- Timber frame extensions · from £21,000
- Porch extensions · from £4,050
- Bungalow extensions · from £26,500
- Home office extensions · from £16,000
- Double-storey extensions · from £38,500
- Planning permission for extensions · from £350
- Kitchen extensions · from £27,500
- Side extensions · from £22,000
- Side return extensions · from £18,000
- Glass box extensions · from £30,500
- Extensions over a garage · from £24,000
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
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
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Plymouth
How much does an extension cost in Plymouth?
Using our South West England factor (×1.02), a standard-spec single-storey extension of 20 m² is a guide £41,500 to £53,500 including VAT, and a 32 m² two-storey extension £58,500 to £77,000. Your written price follows the survey.
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.
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.
How long does an extension take in Plymouth?
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.
Book a free site visit in Plymouth
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.