Extensions in Northwich: design, planning and build
We design and build house extensions for homes in Northwich and the surrounding Cheshire area, with guide prices adjusted for the region.
- Postcode districtsCW8, CW9
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Site visitFree, no obligation
Northwich and surrounding towns
Postcode districts we cover around Northwich include CW8, CW9. We also work in nearby Winsford (5 miles), Warrington (10 miles), Runcorn (10 miles), Widnes (11 miles), Crewe (12 miles). For homes towards Greater Manchester, Altrincham is around 11 miles away.
What works best for Northwich 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.
For many houses here, side return extensions, single-storey rear extensions or double-storey extensions gives the most useful space for the budget.
Approvals for an extension in Northwich
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 extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house. Two-storey side extensions, and any side extension on designated land such as a conservation area, need a householder planning application.
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).
Guide prices for Northwich
We publish guide prices so you can budget before anyone visits. For Northwich they are adjusted by ×0.95, the factor we use across North West England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Orangery extensions | 16 m² | £42,500 – £53,500 |
| Extensions over a garage | 12 m² | £23,500 – £31,000 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
| Double-storey extensions | 32 m² | £54,500 – £71,500 |
| Single-storey rear extensions | 20 m² | £38,500 – £49,500 |
| Wraparound extensions | 25 m² | £54,500 – £69,000 |
All extension types we build in Northwich
- Pitched roof extensions · from £21,000
- Home office extensions · from £15,000
- Utility and boot room extensions · from £13,000
- Single-storey rear extensions · from £19,500
- Building regulations for extensions · from £850
- Flat roof extensions · from £19,500
- Wraparound extensions · from £34,000
- Timber frame extensions · from £19,500
- Bungalow extensions · from £24,500
- Side return extensions · from £17,000
- Extensions over a garage · from £22,500
- Side extensions · from £20,500
- Extension plans and drawings · from £1,100
- Conservatory replacement extensions · from £19,000
- Kitchen extensions · from £25,500
- Porch extensions · from £3,800
- Double-storey extensions · from £36,000
- Glass box extensions · from £28,500
- Bedroom extensions · from £24,500
- Annexe extensions · from £52,000
- Orangery extensions · from £28,500
- Planning permission for extensions · from £300
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
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Northwich
How much does an extension cost in Northwich?
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.
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Northwich, and the guide-price tool gives a range for your own size and finish in about a minute.
Do you cover all of Northwich?
Yes, including the surrounding parts of Cheshire. Site visits are free and there is no obligation.
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 Northwich
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.