Article 4 Direction Areas UK 2026
Where you cannot convert a C3 dwelling-house to a C4 HMO without planning permission. Live count from planning.data.gov.uk.
1,000 live polygons across 12 UK cities — last refreshed 28 May 2026.
What is an Article 4 direction?
An Article 4 direction is a tool councils use to remove Permitted Development Rights — including the rights granted under Use Class Order Schedule 1 to convert a C3 dwellinghouse to a C4 small HMO (3–6 sharers).
In a designated Article 4 area, this means you must apply for planning permission to operate even a small HMO. Refusal is common in HMO-saturated wards. For BTL investors, an Article 4 polygon almost always blocks the C3-to-C4 strategy and forces single-let yields.
City-by-city Article 4 polygon count
Sourced from planning.data.gov.uk article-4-direction-area dataset, ingested quarterly. The total polygon count differs from the unique designation count — many councils file multiple polygons per ward.
| Rank | City / Local Authority | Polygons | HMO-explicit? |
|---|---|---|---|
| 1 | Liverpool | 201 | ✓ explicit HMO designation |
| 2 | Lancaster | 7 | ✓ explicit HMO designation |
| 3 | Cambridge | 7 | policy-area only |
| 4 | Hull | 5 | ✓ explicit HMO designation |
| 5 | Sheffield | 4 | ✓ explicit HMO designation |
| 6 | London | 3 | policy-area only |
| 7 | Manchester | 3 | ✓ explicit HMO designation |
| 8 | Brighton | 2 | ✓ explicit HMO designation |
| 9 | Reading | 1 | ✓ explicit HMO designation |
| 10 | Leicester | 1 | policy-area only |
| 11 | Nottingham | 1 | ✓ explicit HMO designation |
| 12 | Southampton | 1 | ✓ explicit HMO designation |
How investors should use this
- Before offering on any house in a target city, check whether the postcode falls inside an Article 4 polygon. Dwelfy overlays these on every property listing automatically —see a sample analysis.
- If you're buying for HMO conversion, an Article 4 polygon means a planning application is required before you can let to 3+ sharers. Refusal rates in HMO-saturated wards (e.g. Nottingham NG7, Bristol BS1, Leeds LS6) are well over 50%.
- If you already operate an HMO and the area becomes Article 4 after you started letting, you have a Lawful Development Certificate route — but only if you can evidence the use predates the designation by 4+ years.
What this report is, in one line
A live, citable count of UK Article 4 polygon designations broken down by city. Updated quarterly from the official planning.data.gov.uk dataset. Free to use; please credit Dwelfy if you republish.
See Article 4 status on every property listing
Dwelfy overlays Article 4 polygons on every UK property page, cross-referenced with HMO yields, mortgage-impact warnings and a Pass / Hold / Avoid investment verdict.
See a sample property analysis →