National Park against conservation area for householder rights
A conservation area and a National Park strip the same householder rights under the GPDO. The real difference is who decides and against which statutory duty.
On the national park conservation area permitted development difference, the answer surprises most people: for householder rights there is almost no difference at all. Both are article 2(3) land under the General Permitted Development Order 2015, and the Order applies exactly the same restrictions to each. No side extensions, no two-storey rear extensions, no roof enlargements, tighter outbuilding limits and no cladding. What changes between a National Park and a conservation area is who decides the application you now have to make, and the policy they decide it against.
What article 2(3) land covers
Article 2(3) of the Order defines designated land as land within a conservation area, a National Landscape (the term now used for areas of outstanding natural beauty), an area specified for the purposes of section 41(3) of the Wildlife and Countryside Act 1981, the Broads, a National Park, or a World Heritage Site.
Six categories, one label. Wherever the Order says "article 2(3) land", every one of those six is caught in the same words, so a terraced house in a city conservation area and a farmhouse in a National Park lose the same rights.
Designations overlap more often than people expect. A village conservation area inside a National Park inside a World Heritage Site is not unusual, and the restrictions do not stack: the rights are already gone once.
The restrictions are identical
Class A, which covers extensions and alterations to a house, is where most of the loss sits.
| Right | Outside designated land | On article 2(3) land |
|---|---|---|
| Side extension beyond a side wall of the original house | Permitted within limits | Not permitted |
| Rear extension of more than one storey | Permitted within limits | Not permitted |
| Larger rear extension under the prior approval scheme | Available | Not available |
| Cladding in stone, render, timber, tiles or plastic | Permitted | Not permitted |
| Roof enlargement or dormer under Class B | Permitted within volume limits | Not permitted |
| Outbuildings more than 20 m from the house | Permitted within limits | Limited to 10 m² in total |
Flues and chimneys under Class G lose the ability to sit on a principal or side elevation fronting a highway, and satellite antennas under Class H carry extra limits. Solar installations under Part 14 are restricted on walls fronting a highway in a conservation area.
Our note on article 2(3) land and permitted development in protected areas goes through the full list, and the particular problem of side extensions under Class A in a conservation area comes up constantly because the right is gone even where the extension cannot be seen from anywhere public.
Where the designations actually differ
Three things change, and all of them affect the application rather than the right.
The first is the determining authority. In a National Park, the National Park Authority is the local planning authority for most purposes, so the application goes to the park rather than the district council. In a conservation area the district, borough or unitary council decides. That changes the validation list, the fee route, the officer, the design guidance and the committee.
The second is the statutory duty that frames the decision. A National Park authority must pursue the statutory purposes of conserving and enhancing natural beauty, wildlife and cultural heritage, and promoting public understanding and enjoyment, with conservation taking priority where the two conflict. For a National Landscape, decision makers are under a duty to seek to further its purpose of conserving and enhancing natural beauty, a duty strengthened by the Levelling-up and Regeneration Act 2023. In a conservation area the duty is to pay special attention to preserving or enhancing character and appearance, under section 72 of the Planning (Listed Buildings and Conservation Areas) Act 1990.
Those are different tests, and they produce different arguments. A rear extension in a city conservation area is argued on the terrace, the roofscape and views from the street. The same extension in a National Park is argued on landform, long views, dark skies, materials sourced locally and the contribution the building makes to a settlement pattern.
The third is the published guidance. National Park authorities tend to produce detailed design guides on materials, fenestration, boundary treatment and, increasingly, external lighting. District councils produce householder design guides keyed to suburban forms. Read whichever applies before the first sketch, as the differences in approach set out in permitted development in a National Park and conservation area householder permitted development show.
Article 4 directions sit on top
Designation removes a fixed list of rights. An Article 4 direction removes whatever the authority chooses to specify, and it can apply inside or outside designated land.
In practice the two combine. A conservation area with an Article 4 direction may also lose front door and window replacement, roof covering changes, painting of brickwork, removal of boundary walls and front garden hard surfacing. A National Park may use directions to control, for example, agricultural prior approvals or specific changes of use in a defined area.
Directions are local, they vary street by street, and they are the reason two apparently identical houses have different rights. The authority must keep a register, so ask for the direction itself rather than relying on a map layer.
The Broads and World Heritage Sites
The Broads has its own authority with functions comparable to a National Park, and it is named separately in article 2(3). Its flood, navigation and landform issues make it distinctive in substance even though the removed rights are the same.
World Heritage Site inscription brings the same loss of householder rights plus a policy context focused on the Outstanding Universal Value of the site and its setting, assessed with reference to the management plan. Inscription is not a statutory designation in the way listing is, and it carries real weight as a material consideration.
What is still permitted
Quite a lot, and it is worth knowing before assuming an application is needed.
Single-storey rear extensions within the standard depth, height and eaves limits remain permitted. Porches within the limits in Class D remain permitted. Outbuildings remain permitted within 20 metres of the house, subject to the single-storey, height and curtilage rules. Hard surfacing under Class F remains permitted, with the permeability requirement for front gardens over 5 m². Insulation, internal works and repairs that do not materially affect external appearance are not development at all.
Nothing in this applies if the house is listed. Listed building consent is a separate regime, and alterations to a listed house, including internal ones, need consent whether or not the works are permitted development.
Checking what applies to your plot
Do it in this order. Ask the local planning authority, or the National Park authority if you are in one, for a written confirmation of the designations affecting the address and any Article 4 direction in force. Check the national planning data service for conservation area and designation boundaries, remembering that boundaries follow curtilages and can split a garden.
Then, if the works are borderline, apply for a Lawful Development Certificate. It is the only formal way to confirm that works are lawful, and a short supporting planning statement setting out the class relied on and each condition met is what makes that application quick.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. Enter your postcode on PlanScope to see which documents an application on designated land would need.
Frequently asked questions
Are permitted development rights different in a National Park and a conservation area?
The rights removed are identical, because both fall within the definition of article 2(3) land in the General Permitted Development Order 2015. Side extensions, two-storey rear extensions, roof enlargements and cladding go in both. What differs is the determining authority, the statutory duty applied and the published design guidance.
What does article 2(3) land include?
A conservation area, a National Landscape (formerly an area of outstanding natural beauty), an area specified under section 41(3) of the Wildlife and Countryside Act 1981, the Broads, a National Park and a World Heritage Site. Designations frequently overlap, and the rights are removed once rather than cumulatively.
Can I still build a rear extension on designated land?
Yes, a single-storey rear extension within the standard depth, height and eaves limits of Class A remains permitted. What is lost is the larger rear extension prior approval route and anything of more than one storey. A side extension beyond a side wall of the original house is not permitted at all.
Does an Article 4 direction change this?
It can remove further rights on top of the designation, and it applies inside or outside designated land. Common targets are door and window replacement, roof coverings, painting brickwork and front garden hard surfacing. Directions vary street by street, so ask the authority for the direction itself rather than relying on a map.
Who decides my application in a National Park?
The National Park authority acts as the local planning authority for most planning purposes, so the application goes there rather than to the district council. That changes the validation list, the officer, the design guidance and the committee, and the decision is framed by the park's statutory purposes.
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.