Article 2(3) land: which designations remove rights
Five designations make a site article 2(3) land under the GPDO. Side extensions and rear dormers go, single storey rear extensions and rooflights stay.
Article 2(3) land is a defined term in the Town and Country Planning (General Permitted Development) (England) Order 2015, and it covers five categories: land within a conservation area, a National Landscape (formerly an area of outstanding natural beauty), an area specified by the Secretary of State under section 41(3) of the Wildlife and Countryside Act 1981, which in practice means the Broads, a National Park, and a World Heritage Site.
If your property sits in any one of those, a specific set of householder permitted development rights is cut back. Not removed altogether, which is the common misconception, and not the same thing as an Article 4 direction, which is a separate mechanism a council makes itself.
What article 2(3) land covers
The five categories are listed in article 2(3) of the Order, and the restrictions that follow are written into the individual classes in Schedule 2 rather than into article 2(3) itself. So you look up the designation once, then read each class with its article 2(3) exclusions.
Worth being precise about two things. A listed building is not article 2(3) land. Listing restricts what you can do through the separate listed building consent regime, and it does not by itself remove permitted development rights, though a condition on a previous permission may have done. And a site of special scientific interest is not article 2(3) land either, although Part 1 rights are restricted on SSSI land by other provisions.
Conservation areas and National Landscapes
These two produce most of the cases, and the restrictions are the same.
Under Class A, which covers extensions:
- Cladding of any part of the exterior with stone, artificial stone, pebble dash, render, timber, plastic or tiles is not permitted
- The enlarged part must not extend beyond a wall forming a side elevation of the original house
- The enlarged part must not have more than one storey and extend beyond the rear wall
So on article 2(3) land you cannot build a side extension under Class A at all, and a rear extension is limited to single storey. A two-storey rear extension needs planning permission.
Under Class E, which covers outbuildings:
- No outbuilding is permitted to the side of the house
- The total area covered by buildings more than 20 metres from any wall of the house must not exceed 10m²
Under Class G, a chimney, flue or soil vent pipe must not be installed on a wall or roof slope which fronts a highway and forms either the principal elevation or a side elevation. Under Class H, antennas face similar restrictions on elevations fronting a highway.
Class B, which permits roof enlargements including rear dormers, is not available on article 2(3) land at all. That is the restriction householders most often discover late, because a rear dormer on a loft conversion is otherwise one of the most generous rights in Part 1.
National Parks and the Broads
The same Class A, B, E, G and H restrictions apply. National Parks carry additional provisions in the Order, and the national park authority is the local planning authority, which in practice means a more detailed approach to design and materials than a district council might take.
The Broads is included through the section 41(3) route rather than being named as a National Park, and the effect is the same.
World Heritage Sites
Land within a World Heritage Site is article 2(3) land. A buffer zone around a World Heritage Site is not, unless it happens also to be within a conservation area or another listed category, which it often is.
That distinction matters when checking a property on the edge of an inscribed area, and it is a reason to look at the actual boundary rather than at a general constraints note.
Which Class A rights are lost and which survive
Set out plainly, because the surviving rights are more useful than people assume.
| Right | Article 2(3) land |
|---|---|
| Single storey rear extension within the depth limits | Available |
| Two storey or multi-storey rear extension | Not available |
| Side extension under Class A | Not available |
| Rear dormer or roof enlargement under Class B | Not available |
| Rooflights under Class C | Available, subject to the 150mm and side window conditions |
| Outbuilding to the rear within the limits | Available |
| Outbuilding to the side | Not available |
| Hard surfacing under Class F | Available, with permeability requirement at the front |
| Porch under Class D | Available |
| Cladding under Class A | Not available |
The single storey rear extension is the workhorse. Depth limits under Class A still apply, as do the height limits and the 50 per cent curtilage rule, and the prior approval procedure for larger single storey rear extensions is not available on article 2(3) land.
Heights are measured from the ground, and the detail of that measurement catches people, as the note on measuring height under Part 1 explains. Painting and other external alterations have their own position under Part 2, covered in the note on external alterations under Part 2.
Checking the designation reliably
Three sources, in order of reliability.
The national planning data service publishes conservation area, National Park, National Landscape and World Heritage Site boundaries as datasets, and it is the best starting point because the geometry is published rather than drawn on a web map. Conservation area boundaries are supplied by councils, and not every authority has digitised every area, so an absence from the dataset is not proof of absence on the ground.
The council's own interactive map is the next source, and it is the one the case officer will use. Where the two disagree, the council's adopted designation document and its appraisal map are the authority.
The designation document itself is the final answer. A conservation area is designated by a resolution with a map, and that map governs.
Where a site sits on a boundary
Conservation area boundaries frequently run along the back of a plot, through a garden, or down the middle of a road. The designation applies to land, so part of a curtilage can be inside and part outside.
Practical consequences. An outbuilding in the part of the garden outside the conservation area is not restricted by the Class E article 2(3) limits, while one inside is. An extension to the house is restricted if the house is within the area. And a boundary that is ambiguous on the map, because the line is drawn at the scale of a street, needs resolving before anything is built.
Where it matters, apply for a lawful development certificate under section 192 of the Town and Country Planning Act 1990 for the proposed works. It is the only formal route to confirm that works are lawful, and on a boundary case it is money well spent. A short Planning Statement setting out the measurements, the designation position and the relevant class and condition makes that application considerably easier to determine.
An illustrative case
A Victorian terrace within a conservation area, with a loft conversion planned. The owner expects a rear dormer under Class B. Class B is unavailable on article 2(3) land, so the realistic options are rooflights under Class C, which are available, or a planning application for the dormer.
The owner also wants a single storey rear extension of 3 metres and a garden room at the bottom of the plot. Both are available, the extension under Class A within the single storey limits and the garden room under Class E provided it is not to the side and, if more than 20 metres from the house, does not exceed 10m². The example is illustrative.
Finally, check whether an Article 4 direction is also in force, because the two mechanisms overlap in many conservation areas and an Article 4 direction can remove the rights that article 2(3) leaves intact. The note on how a council makes an Article 4 direction sets out how to find one.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.
Frequently asked questions
What is article 2(3) land?
A defined term in the GPDO 2015 covering five categories: land in a conservation area, a National Landscape, an area specified under section 41(3) of the Wildlife and Countryside Act 1981 which in practice means the Broads, a National Park, and a World Heritage Site. The restrictions themselves sit within the individual classes of Schedule 2.
Does listing make a property article 2(3) land?
No. Listed building status restricts works through the separate listed building consent regime, and it does not by itself remove permitted development rights. Many listed buildings are also in conservation areas, which is what triggers the article 2(3) restrictions, and a condition on an earlier permission may have removed rights independently.
Can I build a rear dormer in a conservation area?
Not under permitted development. Class B, which covers enlargements to the roof including rear dormers, is unavailable on article 2(3) land. Rooflights under Class C remain available subject to the 150 millimetre protrusion limit and the obscure glazing condition for side-facing windows, so a planning application is needed for a dormer.
Is a World Heritage Site buffer zone article 2(3) land?
Not in itself. Only land within the inscribed World Heritage Site falls within the definition. A buffer zone is often also within a conservation area or another listed category, in which case the restrictions apply through that route, which is a reason to check the actual boundaries rather than a general constraints note.
What if a conservation area boundary runs through my garden?
The designation applies to land, so part of a curtilage can be inside and part outside, with different rights in each. An outbuilding in the part outside is not subject to the article 2(3) limits for Class E. Where the mapped line is ambiguous, a lawful development certificate is the only formal way to settle it.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.