What Article 4 restricts in Camden, how it affects extensions, lofts and HMOs, and how to plan around it.
Yes — Article 4 removes permitted development for HMO conversions (C3 to C4) across the borough, plus restrictions on basement extensions in 12 conservation areas.
Article 4 removes specific Permitted Development rights — typically the right to convert a single dwelling (C3) to an HMO (C4), or office (B1) to residential (C3), without full planning permission. The right is removed only where the Direction applies.
Yes. Article 4 in most London boroughs targets HMO conversions and office-to-residential, not householder extensions. Standard rear extensions and loft conversions remain available under Permitted Development unless your property is in a conservation area or is listed.
Check the planning portal at Camden Council or call us — we look up the Article 4 status for your specific address before quoting.
If Article 4 applies and you build without planning, you face enforcement action: a retrospective application, a stop notice, or in serious cases an enforcement notice requiring reversal. Always check before starting.



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Every Camden postcode district we draw in, the stock that dominates it and the authority that validates a scheme inside an Article 4 area there. Camden fees below are the statutory England rates for 2026, not scheme inside an Article 4 area estimates.
| Postcode | Area | Dominant stock | What it means for a scheme inside an Article 4 area |
|---|---|---|---|
| EC1N | Hatton Garden | Victorian and Edwardian terraces | Hatton Garden sits wholly inside EC1N, so Camden Council validates every scheme inside an Article 4 area submitted from an EC1N address. |
| N19 | Archway / Tufnell Park | Victorian terraces, post-war flats | A scheme inside an Article 4 area in Archway / Tufnell Park may land with Islington Council or Camden Council — N19 crosses the boundary, and the N19 policies map decides it street by street. |
| NW2 | Cricklewood / Neasden | Edwardian villas and terraces | NW2 straddles a boundary: Cricklewood / Neasden addresses fall to Brent Council or Barnet Council or Camden Council, so confirm which authority validates the scheme inside an Article 4 area before submitting NW2 drawings. |
| NW8 | St John's Wood | Victorian villas, mansion blocks | NW8 straddles a boundary: St John's Wood addresses fall to Westminster City Council or Camden Council, so confirm which authority validates the scheme inside an Article 4 area before submitting NW8 drawings. |
| WC2B | Covent Garden / Holborn | Victorian and Edwardian terraces | WC2B straddles a boundary: Covent Garden / Holborn addresses fall to Westminster City Council or Camden Council, so confirm which authority validates the scheme inside an Article 4 area before submitting WC2B drawings. |
| N1C | King's Cross | Modern apartments, converted warehouses | A scheme inside an Article 4 area at an N1C address in King's Cross is determined by Camden Council under its own Local Plan policies for King's Cross. |
| N6 | Highgate | Georgian villas, Victorian and Edwardian semis | N6 straddles a boundary: Highgate addresses fall to Camden Council or Haringey Council, so confirm which authority validates the scheme inside an Article 4 area before submitting N6 drawings. |
| NW1 | Camden Town / Regent's Park | Victorian terraces, mansion blocks | NW1 straddles a boundary: Camden Town / Regent's Park addresses fall to Camden Council or Westminster City Council, so confirm which authority validates the scheme inside an Article 4 area before submitting NW1 drawings. |
Roof pitch, wall build-up and plot depth change every few Camden streets, and each one changes what a scheme inside an Article 4 area can achieve at that address.
Conservation areas covering Camden: Camden Council runs 40, and Hampstead, Primrose Hill, Bloomsbury are the ones Camden owners meet most. A scheme inside an Article 4 area inside a Camden conservation area loses permitted development, so the Camden submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Primrose Hill a scheme inside an Article 4 area is judged on the street elevation first.
Article 4 and your Camden scheme inside an Article 4 area: Article 4 removes permitted development for HMO conversions (C3 to C4) across the borough, plus restrictions on basement extensions in 12 conservation areas. At a N1C address that matters twice over, because Camden Council applies the direction unevenly across Camden — we read the Camden policies map for the exact N1C address before quoting scheme inside an Article 4 areas.
Camden below-ground policy: Camden's basement policy (Policy A5) restricts single-storey basements to 50% of garden area; double-storey basements generally refused outside commercial zones. Any scheme inside an Article 4 area in Camden that goes below existing foundations triggers two months notice under section 6 of the Party Wall etc. Act 1996, and Camden Council will want the N1C ground and groundwater position set out.
The building fabric around Camden: Victorian and Edwardian terraces, Georgian townhouses in Bloomsbury and Hampstead, post-war mansion blocks, modern developments in King's Cross. Creative, affluent in Hampstead and Primrose Hill; dense mixed-use around Camden Town and Kings Cross; academic character in Bloomsbury. A scheme inside an Article 4 area in Camden is scoped against that stock first.
Sources for this Camden scheme inside an Article 4 area page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.

Camden's Article 4 does two jobs: it removes HMO conversion rights across the borough, and it separately restricts basement work in twelve named conservation areas.
| Measure | Camden | Context |
|---|---|---|
| Article 4 areas on the register | 21 | individually mapped areas, live entries only |
| Enforcement notices issued | 188 | 6th highest of 33; London issued 3,554 |
| Planning contravention notices | 119 | formal requests for information about a suspected breach |
| Breach of condition notices | 24 | served over the same three years |
| Temporary stop notices | 2 | served over the same three years |
Sources: MHCLG District Planning Application Statistics (PS1/PS2) and the MHCLG Planning Data Platform registers, covering 2023 Q2 to 2026 Q1. Contains public sector information licensed under the Open Government Licence v3.0.
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