What an Article 4 Direction does
An Article 4 Direction is a legal instrument made by a local planning authority under Article 4 of the Town and Country Planning (General Permitted Development) Order 2015. It withdraws specified permitted development rights in a defined geographic area — usually a conservation area, a terrace of historic interest, or an estate with consistent architectural character. Once an Article 4 is in place, works that would otherwise be PD (rear extensions, roof lights, painting brickwork, replacing windows, satellite dishes, hardstandings) require a full planning application. Importantly, the council cannot charge a planning fee for works that would have been permitted development — but you still need the application, and refusal is a real possibility.
Hackney, Islington and Camden — heavy Article 4 coverage
Inner London boroughs use Article 4 aggressively to protect Victorian and Georgian terrace character. Hackney has Article 4 Directions covering most of De Beauvoir Town, large parts of Stoke Newington, and the Clapton Square area — removing rights for front extensions, painting, window replacement, and roof alterations. Islington has Article 4s across Barnsbury, Canonbury, Highbury New Park, and most of its 40 conservation areas, with particularly tight controls on roof extensions and front elevation changes. Camden uses Article 4 across the entirety of its conservation areas (Hampstead, Belsize, Primrose Hill, Fitzrovia) to control basement excavations, front railings, sash windows, and chimney removals. Westminster and Kensington and Chelsea have near-universal coverage of their boroughs.
How to check if your property is in an Article 4 zone
Every London borough publishes an interactive planning constraints map. Start with the borough's own GIS portal — Hackney calls it 'Map Hackney', Islington uses 'My Neighbourhood', Camden has 'Camden Map'. Search your postcode and toggle the Article 4 layer. The map will show the polygon and link to the underlying Direction document, which specifies exactly which rights have been removed. Alternatively, the planning portal at gov.uk lets you search by address and lists all designations including Article 4. For absolute certainty, request a formal planning history search from the council (typically £80–£150) or order a CON29 from the local authority during conveyancing — Article 4 status is disclosed in the standard local search.
Article 4 versus conservation area — the distinction
These two designations are often confused but they are legally distinct. A conservation area is a heritage designation under the Planning (Listed Buildings and Conservation Areas) Act 1990 that triggers additional planning controls automatically — for example, demolition control and stricter design tests. An Article 4 Direction is a separate instrument that withdraws specific PD rights. Many conservation areas in London also have an Article 4 overlaid on top, but not all. A property can be in a conservation area without an Article 4, or have an Article 4 without being in a conservation area (rare in London but possible — some estate-character Article 4s in Greenwich and Lewisham fall outside formal conservation areas).
Compensation rights — usually theoretical
If an Article 4 Direction is made and your application for works that would have been PD is then refused, you can claim compensation for the loss of those rights — but only if you make the application within 12 months of the Direction coming into force, and only for the depreciation in the value of your interest in the land. In practice, councils announce Article 4s with 12 months' notice precisely to extinguish compensation rights, and almost no London Article 4 in the last decade has resulted in a successful compensation claim. Treat any compensation provisions as effectively unavailable.
Working with an Article 4 constraint
Article 4 does not mean refusal — it means scrutiny. Good design that respects the character the Direction was made to protect is routinely approved. For a rear extension in a Hackney Article 4 zone, that means matching brickwork (London Stock, not modern reds), sash windows on the new elevation, and a roof form that defers to the original. Pre-application advice is almost always worth the £200–£400 fee because the conservation officer will tell you what they will and won't accept before you commit to drawings. Skipping pre-app in an Article 4 area is the single most expensive mistake London homeowners make.
