Kirkby house extensions
Planning an extension in Kirkby? Compare extension types, see guide prices adjusted for Kirkby and book a free site visit.
- Postcode districtsL9, L10, L11, L31, L32, L33
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Site visitFree, no obligation
Kirkby extension prices at a glance
We publish guide prices so you can budget before anyone visits. For Kirkby they are adjusted by ×0.95, the factor we use across North West England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Kitchen extensions | 20 m² | £39,500 – £50,500 |
| Extensions over a garage | 12 m² | £23,500 – £31,000 |
| Side return extensions | 11 m² | £25,000 – £31,500 |
| Orangery extensions | 16 m² | £42,500 – £53,500 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
Planning rules in Kirkby
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).
Kirkby and surrounding towns
Postcode districts we cover around Kirkby include L9, L10, L11, L31, L32, L33. We also work in nearby Maghull (3 miles), Litherland (4 miles), Prescot (5 miles), Bootle (5 miles), Huyton (5 miles). For homes towards Lancashire, Ormskirk is around 6 miles away.
Which extension suits a Kirkby home?
Across the North West, terraced houses with small rear yards suit compact rear and side return extensions, while suburban semis have room for more.
Start by comparing single-storey rear extensions, kitchen extensions and double-storey extensions: between them they cover most of the layouts we see requested for houses like these.
Every extension type in Kirkby
- Timber frame extensions · from £19,500
- Bungalow extensions · from £24,500
- Wraparound extensions · from £34,000
- Annexe extensions · from £52,000
- Flat roof extensions · from £19,500
- Side return extensions · from £17,000
- Planning permission for extensions · from £300
- Conservatory replacement extensions · from £19,000
- Pitched roof extensions · from £21,000
- Glass box extensions · from £28,500
- Double-storey extensions · from £36,000
- Bedroom extensions · from £24,500
- Kitchen extensions · from £25,500
- Single-storey rear extensions · from £19,500
- Building regulations for extensions · from £850
- Side extensions · from £20,500
- Orangery extensions · from £28,500
- Utility and boot room extensions · from £13,000
- Extension plans and drawings · from £1,100
- Porch extensions · from £3,800
- Extensions over a garage · from £22,500
- Home office extensions · from £15,000
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Kirkby
How much does an extension cost in Kirkby?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Kirkby, and the guide-price tool gives a range for your own size and finish in about a minute.
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 Kirkby?
Yes, including the surrounding parts of Merseyside. Site visits are free and there is no obligation.
Book a free site visit in Kirkby
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.