EN5 · Barnet & Monken Hadley
EN5 covers High Barnet and the Monken Hadley conservation area — a historic common-edge village with Article 4 directions over many of its houses — and the Wood Street conservation area. Monken Hadley is among the borough's most tightly controlled addresses; check the direction before any external change.
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 EN5 crosses 2 boroughs. Enter a full postcode below for the point-level check, or read the full borough picture on the Barnet planning guide.
Is EN5 in a conservation area?
Partly — and which part matters. A postcode district is never uniformly designated: EN5 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 EN5 itself does not fall inside one — but many of its streets will.
| Monken Hadley | Nearby |
| Wood Street | Nearby |
Conservation areas whose official geometry lies within 1km of the centre of EN5. 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 EN5?
Yes — EN5 has 10 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 EN5 falls inside Article 4 Small Houses in Multiple Occupation (HMO) Area 1.
| Article 4 Agricultural Land Restriction Area 1 | Nearby |
| Article 4 for Monken Hadley CA Area 2 | Nearby |
| Article 4 for Wood Street CA Area 1 | Nearby |
| Article 4 for Wood Street CA Area 2 | Nearby |
| Article 4(2) for Monken Hadley CA Area 10 | Nearby |
| Article 4(2) for Monken Hadley CA Area 11 | Nearby |
| Article 4(2) for Monken Hadley CA Area 4 | Nearby |
| Article 4(2) for Monken Hadley CA Area 5 | Nearby |
| Article 4(2) for Monken Hadley CA Area 8 | Nearby |
| Article 4(2) for Monken Hadley CA Area 9 | Nearby |
Article 4 directions whose official geometry lies within 1km of the centre of EN5. 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 EN5?
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 |
EN5 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 EN5?
| 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.