Home extensions in Harringay
We design and build house extensions for homes in Harringay and the surrounding Greater London area, with guide prices adjusted for the region.
- Postcode districtsN4, N8, N15, N16, N17, N22
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Which extension suits a Harringay home?
London's housing is dominated by Victorian and Edwardian terraces, many with a rear outrigger and a side return, and 1930s semis in the outer boroughs. Conservation areas are common, so the planning check comes first.
Start by comparing kitchen extensions, glass box extensions and wraparound extensions: between them they cover most of the layouts we see requested for houses like these.
Areas we cover around Harringay
Our survey diary covers Harringay, including N4, N8, N15, N16, N17, N22. We also work in nearby Wood Green (1 mile), Stamford Hill (1 mile), Muswell Hill (2 miles), Tottenham (2 miles), Highbury (2 miles). Just over the Essex border, Waltham Abbey is about 8 miles away.
Harringay extension prices at a glance
We publish guide prices so you can budget before anyone visits. For Harringay they are adjusted by ×1.3, the factor we use across London.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Side return extensions | 11 m² | £34,000 – £43,000 |
Planning and building control in Harringay
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).
Extension types and starting prices
- Single-storey rear extensions · from £27,000
- Side extensions · from £28,500
- Conservatory replacement extensions · from £26,000
- Double-storey extensions · from £49,000
- Kitchen extensions · from £35,000
- Building regulations for extensions · from £1,150
- Utility and boot room extensions · from £18,000
- Extension plans and drawings · from £1,550
- Bedroom extensions · from £33,500
- Planning permission for extensions · from £450
- Glass box extensions · from £39,000
- Annexe extensions · from £71,500
- Wraparound extensions · from £46,500
- Porch extensions · from £5,200
- Orangery extensions · from £39,000
- Flat roof extensions · from £27,000
- Timber frame extensions · from £27,000
- Side return extensions · from £23,000
- Pitched roof extensions · from £28,500
- Bungalow extensions · from £34,000
- Extensions over a garage · from £31,000
- Home office extensions · from £20,500
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in Harringay
How much does an extension cost in Harringay?
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 I need planning permission for an extension in Harringay?
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.
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.
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 Harringay
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.