Extensions in Redruth: design, planning and build
Every type of house extension in Redruth, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsTR15, TR16
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
Redruth and surrounding towns
Site visits are available across Redruth (TR15, TR16). Neighbouring towns we cover include Camborne (4 miles), Truro (8 miles), Falmouth (9 miles), Newquay (14 miles), Penzance (16 miles). For homes towards Devon, Plymouth is around 49 miles away.
What works best for Redruth houses?
In the South West, local stone, render and brick vary from town to town, so matching materials is a big part of designing an extension that looks right.
For many houses here, annexe extensions, orangery extensions or pitched roof extensions gives the most useful space for the budget.
Redruth extension prices at a glance
We publish guide prices so you can budget before anyone visits. For Redruth they are adjusted by ×1.02, the factor we use across South West England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Orangery extensions | 16 m² | £45,500 – £57,500 |
| Single-storey rear extensions | 20 m² | £41,500 – £53,500 |
| Extensions over a garage | 12 m² | £25,500 – £33,500 |
| Wraparound extensions | 25 m² | £58,500 – £74,000 |
| Side return extensions | 11 m² | £26,500 – £34,000 |
Approvals for an extension in Redruth
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.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Applications are decided by the local planning authority (your district, borough or unitary council).
Choose an extension type
- Bungalow extensions · from £26,500
- Planning permission for extensions · from £350
- Double-storey extensions · from £38,500
- Orangery extensions · from £30,500
- Building regulations for extensions · from £900
- Timber frame extensions · from £21,000
- Kitchen extensions · from £27,500
- Utility and boot room extensions · from £14,000
- Annexe extensions · from £56,000
- Extensions over a garage · from £24,000
- Glass box extensions · from £30,500
- Single-storey rear extensions · from £21,000
- Wraparound extensions · from £36,500
- Side extensions · from £22,000
- Home office extensions · from £16,000
- Conservatory replacement extensions · from £20,000
- Porch extensions · from £4,050
- Pitched roof extensions · from £22,500
- Side return extensions · from £18,000
- Extension plans and drawings · from £1,200
- Flat roof extensions · from £21,000
- Bedroom extensions · from £26,500
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 produce the drawings and structural design, and manage the approvals so they are in place before work starts.
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
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in Redruth
How much does an extension cost in Redruth?
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.
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.
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.
Do you cover all of Redruth?
Yes, including the surrounding parts of Cornwall. Site visits are free and there is no obligation.
Book a free site visit in Redruth
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.