Slinfold's Article 4 direction — the village where extensions have no permitted development rights

If your house is in Slinfold Conservation Area, you have no permitted development rights for an extension. Not reduced ones. None.

This has been the case since 19 December 1997, and it catches people out regularly, because it is not something a general guide to permitted development will ever tell you.

What an Article 4 direction is

Permitted development rights are national. They are granted by legislation and they apply everywhere by default.

An Article 4 direction is a local planning authority removing some of those rights in a defined area. The development itself is not banned — you simply have to apply for planning permission for something that would otherwise not have needed it. Councils use them where the cumulative effect of small unremarkable changes would erode the character of somewhere they consider worth protecting.

What Slinfold’s direction removes

The Slinfold direction removes Part 1 Class A — the right covering the enlargement, improvement or other alteration of a dwellinghouse.

That is the extension right. All of it. A modest single storey rear extension that would be permitted development anywhere else in the district needs a full householder planning application in Slinfold.

Note this stacks on top of the conservation area restrictions rather than replacing them. Slinfold is one of the district’s 39 conservation areas, so it is also article 2(3) land — meaning no permitted development loft conversions, no cladding, and so on. The Article 4 direction removes what conservation area status left behind.

The other Article 4 directions that affect homes in Horsham District

There are 53 Article 4 records for Horsham District, but the overwhelming majority are rural and have nothing to do with houses — agricultural and forestry development on named farms, caravan sites, fences, some dating back to 1962.

Only three touch householders:

Area	What it removes	In force from
Slinfold Conservation Area	Class A — extensions, improvement or alteration of a house	19 December 1997
11, 13, 15 and 19 Denne Road, Horsham	Class A (extensions), Class B (roof alterations and dormers), Class G (chimneys and flues), and Part 2 Class C (exterior painting)	9 March 2001
Amberley Conservation Area	Part 2 Class C (exterior painting) and Part 11 Class C (demolition of gates, fences and walls)	26 September 1997

The Denne Road direction is unusually tight — four individually named properties where even repainting the outside of the house needs permission.

There is a fourth record, covering 106 New Street in Horsham, but it is recorded as never confirmed, so it is not in force. Article 4 directions have to be confirmed to take effect, and an unconfirmed one has no legal weight.

What it means for your project

Budget for a planning application from the start. A householder application is currently £548, with a statutory eight week determination period from validation. Add one to two weeks for validation itself.

Expect the design to be scrutinised. In a conservation area with an Article 4 direction, the council has gone out of its way to say it wants control over what happens. Materials, proportions, roof form and visibility from the street will all matter. Slinfold’s conservation area has an adopted character statement — read it before designing anything, because it is essentially the brief.

You cannot get around it with a lawful development certificate. A certificate confirms that work is lawful without permission. Where the Article 4 direction has removed the right, there is nothing to certify.

Do not rely on what a neighbour did. Work carried out before December 1997 was done under different rules. Work carried out since may have had permission you did not see, or may be unauthorised.

Check before you design, not after

Article 4 boundaries follow the conservation area boundary, and conservation area boundaries follow historic plot patterns rather than roads. The only reliable check is the council’s mapping tool against your actual address.

If it turns out you are inside it, the sensible next step is pre-application advice. Horsham District Council charges £105 for written advice on extensions and alterations with a 28-day response. On a project where the council has explicitly reserved the right to say no, finding out what they will accept before you pay for detailed drawings is worth considerably more than it costs.

What to do next

If you are in Slinfold, Denne Road or Amberley — or you are not sure — the answer changes your programme by about three months and your budget by the application fee plus the drawings to support it. Better to know now.

Tell us the address and we will tell you what applies.