House extensions in Holloway
Planning an extension in Holloway? Compare extension types, see guide prices adjusted for Holloway and book a free site visit.
- Postcode districtsN1C, N5, N6, N7, N19, NW5
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Guide prices for Holloway
We publish guide prices so you can budget before anyone visits. For Holloway they are adjusted by ×1.3, the factor we use across London.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
Planning rules in Holloway
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).
Holloway and surrounding towns
We cover Holloway and the postcode districts N1C, N5, N6, N7, N19, NW5. The same team covers Highbury (1 mile), Camden Town (1 mile), Chalk Farm (1 mile), Harringay (2 miles), Stamford Hill (2 miles), all within easy reach. For homes towards Hertfordshire, Borehamwood is around 10 miles away.
What works best for Holloway 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.
For many houses here, glass box extensions, kitchen extensions or side return extensions gives the most useful space for the budget.
Every extension type in Holloway
- Single-storey rear extensions · from £27,000
- Flat roof extensions · from £27,000
- Porch extensions · from £5,200
- Annexe extensions · from £71,500
- Double-storey extensions · from £49,000
- Building regulations for extensions · from £1,150
- Bedroom extensions · from £33,500
- Wraparound extensions · from £46,500
- Extensions over a garage · from £31,000
- Orangery extensions · from £39,000
- Extension plans and drawings · from £1,550
- Glass box extensions · from £39,000
- Utility and boot room extensions · from £18,000
- Pitched roof extensions · from £28,500
- Kitchen extensions · from £35,000
- Side return extensions · from £23,000
- Conservatory replacement extensions · from £26,000
- Home office extensions · from £20,500
- Timber frame extensions · from £27,000
- Planning permission for extensions · from £450
- Bungalow extensions · from £34,000
- Side extensions · from £28,500
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 produce the drawings and structural design, and manage the approvals so they are in place before work starts.
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 Holloway
How much does an extension cost in Holloway?
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.
Do I need planning permission for an extension in Holloway?
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.
Do you cover all of Holloway?
Yes, including the surrounding parts of Greater London. Site visits are free and there is no obligation.
Book a free site visit in Holloway
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.