Extensions in Enfield: design, planning and build
Looking to extend your home in Enfield? Start here: extension types, guide prices for Enfield, the planning rules that apply and how a project runs.
- Postcode districtsEN1, EN2, EN3, N9, N14, N21
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Choosing the right extension in Enfield
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, side return extensions or kitchen extensions gives the most useful space for the budget.
Planning and building control in Enfield
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 two-storey rear extension is permitted development only if it projects no more than 3 m from the original rear wall, sits at least 7 m from the rear boundary, matches the roof pitch and uses obscure, non-opening side windows upstairs. Most two-storey extensions therefore go through a householder planning application, which costs £548 from 1 April 2026 and normally takes about 8 weeks.
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).
Enfield extension prices at a glance
Use these Enfield guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
Areas we cover around Enfield
Across EN1, EN2, EN3, N9, N14, N21, we can visit, measure and advise. Neighbouring towns we cover include Ponders End (2 miles), Edmonton (2 miles), Palmers Green (3 miles), Enfield Lock (3 miles), East Barnet (3 miles). Just over the Hertfordshire border, Cheshunt is about 4 miles away.
Every extension type in Enfield
- Extensions over a garage · from £31,000
- Flat roof extensions · from £27,000
- Conservatory replacement extensions · from £26,000
- Bungalow extensions · from £34,000
- Annexe extensions · from £71,500
- Timber frame extensions · from £27,000
- Orangery extensions · from £39,000
- Wraparound extensions · from £46,500
- Side extensions · from £28,500
- Pitched roof extensions · from £28,500
- Bedroom extensions · from £33,500
- Single-storey rear extensions · from £27,000
- Planning permission for extensions · from £450
- Double-storey extensions · from £49,000
- Side return extensions · from £23,000
- Kitchen extensions · from £35,000
- Building regulations for extensions · from £1,150
- Glass box extensions · from £39,000
- Utility and boot room extensions · from £18,000
- Home office extensions · from £20,500
- Porch extensions · from £5,200
- Extension plans and drawings · from £1,550
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
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 Enfield
How much does an extension cost in Enfield?
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 Enfield?
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.
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Enfield, and the guide-price tool gives a range for your own size and finish in about a minute.
How long does an extension take in Enfield?
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.
Book a free site visit in Enfield
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.