EN4 · Cockfosters & East Barnet
EN4 is Cockfosters and East Barnet, spanning Barnet and Enfield. Metro-land semis and larger plots dominate; outside Article 4 conservation areas, rear extensions and lofts often proceed under permitted development. Enfield's borough-wide small-HMO direction and Barnet's conservation Article 4s mean the address-level council check is decisive.
Location data: postcodes.io · Constraints: planning.data.gov.uk (borough-level) · Open Government Licence
Constraint context · Barnet
Real · planning.data.gov.ukBarnet has 16 designated conservation areas and 48 Article 4 areas. A district is too coarse to say which apply to your house — postcode districts span many streets and EN4 crosses 3 boroughs. Enter a full postcode below for the point-level check, or read the full borough picture on the Barnet planning guide.
Is EN4 in a conservation area?
Partly — and which part matters. A postcode district is never uniformly designated: EN4 contains 2 conservation areas within 1km of its centre, and whether your own property sits inside one decides whether permitted development survives. The centre point of EN4 itself does not fall inside one — but many of its streets will.
| Monken Hadley | Nearby |
| TRENT PARK | Nearby |
Conservation areas whose official geometry lies within 1km of the centre of EN4. Source: planning.data.gov.uk · Open Government Licence. Proximity to the district centre is not a statement about your own address — run the address check for that.
Does an Article 4 direction apply in EN4?
Yes — EN4 has 4 Article 4 directions mapped within 1km of its centre. An Article 4 direction withdraws specific permitted-development rights on the streets it covers, which is the most common reason a project that looks like permitted development turns out to need a full application. The centre point of EN4 falls inside Article 4 Small Houses in Multiple Occupation (HMO) Area 1.
| Article 4 Small Houses in Multiple Occupation (HMO) Area 1 | At the centre |
| Article 4(2) for Monken Hadley CA Area 15 | Nearby |
| Borough wide | Nearby |
| Trent Park | Nearby |
Article 4 directions whose official geometry lies within 1km of the centre of EN4. Source: planning.data.gov.uk · Open Government Licence. The national dataset omits some property-specific directions — the council register is always definitive.
Every designation in the borough: Barnet planning guide →
Do you need planning permission in EN4?
Three routes exist, and which one you are on is decided by your address, not your postcode district:
| Permitted development — no application. The work stays inside the GPDO limits and no designation removes them. A Lawful Development Certificate is cheap proof for a future buyer. | No permission |
| Prior approval — the larger single-storey rear extension route, with neighbour consultation. Not available on designated land. | 42 days |
| Full householder application — required once a designation removes your permitted-development right, or the scheme exceeds the limits. | 8 weeks |
EN4 contains mapped conservation-area or Article 4 geometry, so a meaningful share of its streets will have lost some permitted-development rights — which pushes those properties onto the full-application route. Whether yours is one of them is an address-level question, not a district-level one.
What does planning permission cost in EN4?
| Householder planning application | £548 (from 1 April 2026) |
| Lawful Development Certificate — proposed works | £274 (half the application fee) |
| Lawful Development Certificate — existing works | £548 (the full application fee) |
| Listed building consent | No fee |
| Resubmission after a refusal | Free once, within 12 months of the decision |
National statutory figures for England — councils do not set them, so they are the same in every borough. Planning fees re-index every 1 April; confirm the current amount on the Planning Portal fee calculator before you apply. These are the council's fees only — drawings, surveys and any specialist reports are separate.
How long does it take?
| Householder application — statutory target | 8 weeks |
| Householder application — in practice | 8–12 weeks |
| Prior approval (larger home extension) | 42 days |
| Lawful Development Certificate | 8 weeks |
| Householder appeal — deadline to lodge | 12 weeks from the decision date |
| Householder appeal — typical decision | Around 18 weeks |
What if it's refused?
A refusal is a decision notice with reasons attached, and those reasons are a roadmap. Most homeowners in Barnet — as anywhere in England — are better served by amending the scheme and using the free resubmission than by appealing: you get one further application on the same site within 12 months without paying again.
| Who can appeal | The applicant only — not neighbours |
| Fee to appeal | None — you bear your own costs |
| Procedure | Written representations for most householder appeals |
| Success rate | Roughly a third — about 36% of householder appeals allowed in 2025/26 |
Appeals go to the Planning Inspectorate, an independent national body. How to read a refusal and choose your route →
Planning permission by project in Barnet
Generous interwar plots make rear and wrap-around extensions feasible; the Article 4 conservation areas (HGS, Mill Hill, Totteridge) need a full application.
Rear extension in Barnet →Workable on the Edwardian terraces of Finchley and Golders Green; the Article 4 conservation areas need a full application.
Side return extension in Barnet →The interwar semis convert readily under PD; in HGS, Mill Hill, Totteridge and the other Article 4 areas a full application is needed.
Loft conversion in Barnet →Less common than in inner London; a full application with structural and ground-condition evidence is expected, more so in the Article 4 conservation areas.
Basement extension in Barnet →Large suburban gardens suit substantial garden rooms under PD; in the Article 4 conservation areas, outbuilding PD rights can be removed — check the direction.
Garden room in Barnet →Pinpoint your street
More of Barnet
Hampstead Garden Suburb and the Article 4 suburbs; a large outer-London extension market.
Borough page →Planning Permission Checker provides planning and cost intelligence for early feasibility only. It is not legal, planning, valuation, architectural, structural, or surveying advice. All estimates are indicative and must be verified by qualified professionals before purchase, design, planning submission, or construction.
Cost estimates are indicative only — not a quotation. Final price depends on survey, specification, structure, access, party wall matters, VAT, professional fees, and contractor availability.
Planning outcomes are not guaranteed. Local planning authorities make final decisions.