Article 4 Directions Explained — What They Are and How They Affect Your Project

Under normal planning law, the General Permitted Development Order (GPDO) grants 'Permitted Development rights' — the right to carry out certain types of development without applying for planning permission. The GPDO grants these rights nationally, subject to specific size, height, and use conditions.

• An Article 4 Direction is a power available to local planning authorities under Article 4 of the GPDO. It allows them to withdraw specified Permitted Development rights from properties within a defined area. Once an Article 4 Direction is in place:
• •The development described in the Direction is no longer Permitted Development within that area
• •A full planning application must be made for that type of development
• •The planning authority can refuse permission

Article 4 Directions do not prohibit development — they require it to go through the planning application process, where it can be assessed on its merits.

**Who can make an Article 4 Direction?** Local planning authorities. In London, this means the relevant London Borough Council. Some directions are made by the Secretary of State but this is rare.

**How long do Article 4 Directions last?** Indefinitely, unless the local authority cancels them. Most Article 4 Directions in London have been in place for decades.

Article 4 Directions are used in two main contexts in London:

**1. Conservation Areas** The most widespread use of Article 4 Directions in London is to protect the character of Conservation Areas. In most London Conservation Areas, Article 4 Directions remove some or all Permitted Development rights for householders. This typically means that works which would be Permitted Development elsewhere — including certain types of extensions, loft conversions with dormers, replacement windows, and changes to roofmaterials — require planning permission within the Conservation Area.

• Notable London Conservation Areas with extensive Article 4 Directions:
• •Islington (most Conservation Areas)
• •Hackney (many Conservation Areas)
• •Southwark (multiple Conservation Areas)
• •Hammersmith & Fulham (most Conservation Areas)
• •Richmond (multiple Conservation Areas)
• •Wandsworth (multiple Conservation Areas)
• •Westminster (extensive Conservation Areas)
• •Kensington & Chelsea (most Conservation Areas)

**2. HMO Article 4 Directions** The second major use of Article 4 Directions in London is to control the proliferation of Houses in Multiple Occupation (HMOs). Under the GPDO, converting a property from a single dwelling (Use Class C3) to a small HMO (Use Class C4 — up to 6 occupants) is Permitted Development and does not require planning permission. Where a local authority introduces an HMO Article 4 Direction, this change of use requires a planning application.

• London boroughs with HMO Article 4 Directions (partial list):
• •Southwark
• •Lambeth
• •Newham
• •Lewisham
• •Brent
• •Ealing
• •Enfield

HMO Article 4 Directions are typically applied to specific wards or areas rather than an entire borough.

For householders considering an extension, loft conversion, or other improvement works, an Article 4 Direction in a Conservation Area typically removes some or all of the following Permitted Development rights:

**Rear extensions**: some Conservation Area Article 4 Directions require planning permission for rear extensions that would otherwise be Permitted Development (Class A/B GPDO). The planning application will be assessed against the impact on the character of the Conservation Area — particularly visible from within the Conservation Area, from neighbouring properties, or from public spaces.

**Roof alterations including loft conversions**: Conservation Area Article 4 Directions very commonly remove the right to make alterations to the roof (Class C/B GPDO), which in practice means dormer loft conversions require planning permission. Velux rooflights on the front slope require permission; rear Velux rooflights are sometimes still Permitted Development even in Conservation Areas.

**Changes to windows and doors**: Article 4 Directions routinely require planning permission for replacing windows (particularly changing from timber sash to uPVC) in Conservation Areas. This is because window specification is a major factor in the character of a Victorian street.

**Cladding and external materials**: changes to the external materials of a property in a Conservation Area often require planning permission under Article 4.

• **Practical implications**:
• •Planning applications in Conservation Areas take 8–13 weeks
• •Planning fees apply (£258 for householder applications in England 2024)
• •Refusals are more common than in non-designated areas — design quality and material choice matter more
• •A pre-application discussion with the Conservation Officer is strongly recommended before submitting a formal application

Where an HMO Article 4 Direction is in place, converting a property from a single dwelling to an HMO of up to 6 occupants (Use Class C4) requires planning permission.

• **What the planning authority assesses**:
• •The proportion of HMOs already in the relevant area (some councils refuse if HMO density exceeds 10–20% of dwellings in a radius)
• •Parking impact
• •Impact on amenity of neighbouring residents
• •Compliance with HMO design and amenity standards

**Refusal risk**: in areas where Article 4 Directions have been put in place, councils are typically motivated by a desire to prevent further HMO growth. This means planning applications for HMO conversion in these areas have a higher refusal rate than in other areas.

**Large HMOs (7+ occupants, Use Class Sui Generis)**: these always require planning permission regardless of whether an Article 4 Direction is in place, because the change of use from C3 or C4 to Sui Generis is never Permitted Development.

**Step 1: Check your local authority's planning portal** Most London Borough websites have an 'interactive map' or 'planning constraints' tool that shows designated areas including Conservation Areas and Article 4 Directions. Search your borough council's website for 'Article 4 Direction' or 'Conservation Area Map'.

**Step 2: Use the Planning Portal** The national Planning Portal (planningportal.co.uk) allows you to view designation information for a property address.

**Step 3: Submit a pre-application enquiry** If you are unsure whether an Article 4 Direction applies to your property and what it covers, submit a pre-application enquiry to the local planning authority. Most councils provide written pre-application advice within 4–6 weeks (fees typically £50–£300 depending on the application type).

**Step 4: Speak to a planning consultant or your contractor** A design-and-build contractor familiar with London's planning landscape can advise on whether Article 4 is likely to affect your project and how to approach the planning process.

**The key message**: always check before starting works. Carrying out works that require planning permission (due to an Article 4 Direction) without a planning application is an enforcement risk — and could affect your ability to sell the property.