Extensions in Highbury: design, planning and build
More space without moving: we plan and build extensions across Highbury, with one team for the drawings, the council and the build.
- Postcode districtsN1C, N1, N4, N5, N7, N16
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Highbury extension prices at a glance
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 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
Covering Highbury and nearby
Our survey diary covers Highbury, including N1C, N1, N4, N5, N7, N16. Neighbouring towns we cover include Holloway (1 mile), Stamford Hill (2 miles), Camden Town (2 miles), Chalk Farm (2 miles), Harringay (2 miles). Just over the Essex border, Waltham Abbey is about 10 miles away.
Choosing the right extension in Highbury
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.
For many houses here, glass box extensions, kitchen extensions or wraparound extensions gives the most useful space for the budget.
Planning and building control in Highbury
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).
Extension types and starting prices
- Utility and boot room extensions · from £18,000
- Conservatory replacement extensions · from £26,000
- Side extensions · from £28,500
- Side return extensions · from £23,000
- Porch extensions · from £5,200
- Annexe extensions · from £71,500
- Orangery extensions · from £39,000
- Flat roof extensions · from £27,000
- Single-storey rear extensions · from £27,000
- Extension plans and drawings · from £1,550
- Home office extensions · from £20,500
- Pitched roof extensions · from £28,500
- Bedroom extensions · from £33,500
- Double-storey extensions · from £49,000
- Bungalow extensions · from £34,000
- Timber frame extensions · from £27,000
- Building regulations for extensions · from £1,150
- Glass box extensions · from £39,000
- Planning permission for extensions · from £450
- Extensions over a garage · from £31,000
- Wraparound extensions · from £46,500
- Kitchen extensions · from £35,000
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
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
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 Highbury
How much does an extension cost in Highbury?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Highbury, and the guide-price tool gives a range for your own size and finish in about a minute.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Do you cover all of Highbury?
Yes, including the surrounding parts of Greater London. Site visits are free and there is no obligation.
Book a free site visit in Highbury
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.