Newton-le-Willows house extensions
From a small utility to a two-storey addition, we take on house extensions throughout Newton-le-Willows, starting with a free visit and a planning check.
- Postcode districtsWA12
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Site visitFree, no obligation
Covering Newton-le-Willows and nearby
Postcode districts we cover around Newton-le-Willows include WA12. Neighbouring towns we cover include Golborne (2 miles), St Helens (5 miles), Prescot (8 miles), Huyton (10 miles), Halewood (11 miles). Just over the Greater Manchester border, Ashton-in-Makerfield is about 3 miles away.
What extensions cost in Newton-le-Willows
Prices on this page use our North West England factor of ×0.95, 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 | £38,500 – £49,500 |
| Orangery extensions | 16 m² | £42,500 – £53,500 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
| Wraparound extensions | 25 m² | £54,500 – £69,000 |
| Extensions over a garage | 12 m² | £23,500 – £31,000 |
Choosing the right extension in Newton-le-Willows
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.
Start by comparing single-storey rear extensions, double-storey extensions and side return extensions: between them they cover most of the layouts we see requested for houses like these.
Do extensions in Newton-le-Willows 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).
Every extension type in Newton-le-Willows
- Building regulations for extensions · from £850
- Pitched roof extensions · from £21,000
- Home office extensions · from £15,000
- Bedroom extensions · from £24,500
- Utility and boot room extensions · from £13,000
- Side extensions · from £20,500
- Extensions over a garage · from £22,500
- Timber frame extensions · from £19,500
- Side return extensions · from £17,000
- Kitchen extensions · from £25,500
- Conservatory replacement extensions · from £19,000
- Orangery extensions · from £28,500
- Annexe extensions · from £52,000
- Double-storey extensions · from £36,000
- Planning permission for extensions · from £300
- Porch extensions · from £3,800
- Flat roof extensions · from £19,500
- Single-storey rear extensions · from £19,500
- Glass box extensions · from £28,500
- Wraparound extensions · from £34,000
- Extension plans and drawings · from £1,100
- Bungalow extensions · from £24,500
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
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 Newton-le-Willows
How much does an extension cost in Newton-le-Willows?
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.
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Newton-le-Willows, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Newton-le-Willows
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.