Home extensions in Kilburn
Planning an extension in Kilburn? Compare extension types, see guide prices adjusted for Kilburn and book a free site visit.
- Postcode districtsNW2, NW3, NW6, NW8, NW11, W9
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Covering Kilburn and nearby
We cover Kilburn and the postcode districts NW2, NW3, NW6, NW8, NW11, W9. Neighbouring towns we cover include Cricklewood (1 mile), Golders Green (2 miles), Chalk Farm (2 miles), Camden Town (2 miles), Willesden (2 miles). Just over the Hertfordshire border, Borehamwood is about 8 miles away.
What works best for Kilburn houses?
Across London, terraced houses with narrow side returns and tight access are the norm, which shapes everything from party wall notices to how materials reach the back garden.
Start by comparing glass box extensions, wraparound extensions and side return extensions: between them they cover most of the layouts we see requested for houses like these.
Popular extension prices in Kilburn
Every figure below is a guide for Kilburn, adjusted for London build costs (×1.3) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
Planning rules in Kilburn
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).
Choose an extension type
- Flat roof extensions · from £27,000
- Double-storey extensions · from £49,000
- Single-storey rear extensions · from £27,000
- Building regulations for extensions · from £1,150
- Annexe extensions · from £71,500
- Porch extensions · from £5,200
- Planning permission for extensions · from £450
- Side extensions · from £28,500
- Orangery extensions · from £39,000
- Bedroom extensions · from £33,500
- Utility and boot room extensions · from £18,000
- Timber frame extensions · from £27,000
- Conservatory replacement extensions · from £26,000
- Pitched roof extensions · from £28,500
- Side return extensions · from £23,000
- Glass box extensions · from £39,000
- Home office extensions · from £20,500
- Extension plans and drawings · from £1,550
- Extensions over a garage · from £31,000
- Kitchen extensions · from £35,000
- Wraparound extensions · from £46,500
- Bungalow extensions · from £34,000
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
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
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Questions about extensions in Kilburn
How much does an extension cost in Kilburn?
Using our London factor (×1.3), a standard-spec single-storey extension of 20 m² is a guide £53,000 to £68,000 including VAT, and a 32 m² two-storey extension £74,500 to £98,000. Your written price follows the survey.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Kilburn, 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.
Do I need planning permission for an extension in Kilburn?
Not always. It depends on the size, position and your property's history. Many single-storey rear extensions in England are permitted development or can use prior approval.
Book a free site visit in Kilburn
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.