Extending your home in Muswell Hill
More space without moving: we plan and build extensions across Muswell Hill, with one team for the drawings, the council and the build.
- Postcode districtsN2, N6, N8, N10, N11, N22
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Muswell Hill and surrounding towns
Our survey diary covers Muswell Hill, including N2, N6, N8, N10, N11, N22. We also work in nearby Wood Green (1 mile), Friern Barnet (2 miles), Harringay (2 miles), Palmers Green (2 miles), Finchley (2 miles). For homes towards Hertfordshire, Potters Bar is around 7 miles away.
Popular extension prices in Muswell Hill
Prices on this page use our London factor of ×1.3, 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) |
|---|---|---|
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
Which extension suits a Muswell Hill home?
In London, space is at a premium and gardens are often short, so side returns, wraparounds and carefully planned rear extensions tend to make the most of every metre.
Start by comparing kitchen extensions, side return extensions and glass box extensions: between them they cover most of the layouts we see requested for houses like these.
Approvals for an extension in Muswell Hill
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.
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 Muswell Hill
- Conservatory replacement extensions · from £26,000
- Kitchen extensions · from £35,000
- Annexe extensions · from £71,500
- Glass box extensions · from £39,000
- Home office extensions · from £20,500
- Building regulations for extensions · from £1,150
- Orangery extensions · from £39,000
- Side extensions · from £28,500
- Single-storey rear extensions · from £27,000
- Extension plans and drawings · from £1,550
- Bedroom extensions · from £33,500
- Porch extensions · from £5,200
- Timber frame extensions · from £27,000
- Planning permission for extensions · from £450
- Utility and boot room extensions · from £18,000
- Pitched roof extensions · from £28,500
- Wraparound extensions · from £46,500
- Double-storey extensions · from £49,000
- Side return extensions · from £23,000
- Flat roof extensions · from £27,000
- Extensions over a garage · from £31,000
- Bungalow extensions · from £34,000
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
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 Muswell Hill
How much does an extension cost in Muswell Hill?
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.
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.
How long does an extension take in Muswell Hill?
Usually 2 to 4 months of design and approvals, then 10 to 16 weeks on site for a single-storey extension or 16 to 24 weeks for two storeys.
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.
Book a free site visit in Muswell Hill
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.