Conservation, heritage and protected sites in planning

Planning constraints are not all the same. A listed building, a National Landscape, a Special Protection Area and a Tree Preservation Order can all affect development, but they do so through very different legislation, policy tests and consent regimes.

This section brings those subjects together without pretending they are interchangeable. For planning purposes it is usually easiest to think about them in three groups: heritage assets, protected landscapes, and nature and protected sites. A single site can of course sit within several of these at once.

If you are looking at a particular property, start by checking the development plan and policies map, the council’s own constraint mapping and, for many national environmental designations, the DEFRA MAGIC Map. Do not assume that a designation automatically prevents development: the important question is what legal or policy test that particular designation triggers.

Heritage assets and the historic environment

Heritage planning is concerned with the significance of buildings, monuments, places and landscapes and with the effect development would have on that significance. Our guide to heritage significance and harm explains the August 2026 NPPF framework, including positive effects, no effect, harm, substantial harm and total loss, public benefits and the separate statutory duties that apply to listed buildings and conservation areas.

The principal heritage subjects currently covered by Planning Geek are:

• Listed buildings – what statutory listing covers, curtilage structures and the relationship with Listed Building Consent
• Conservation areas – designation, section 72, relevant demolition, trees and permitted development
• Non-designated heritage assets and locally listed buildings – local heritage value without a separate statutory consent regime
• Setting of a heritage asset – why setting has no fixed distance or automatic buffer
• Archaeology and planning – HERs, desk-based assessment, field evaluation, scheduled archaeology and non-designated archaeological interest
• Ridge and furrow planning – surviving field earthworks, historic landscape significance and how NPPF HE5, HE7 and HE10 apply
• Registered parks and gardens – nationally designated designed landscapes, their significance and setting
• Registered battlefields – nationally important battlefields, archaeology, landscape and setting
• Protected wreck sites – designated underwater heritage, licensing and planning considerations
• World Heritage Sites – Outstanding Universal Value, setting, buffer zones, EIA and the dedicated NPPF HE8 policy
• Scheduled monuments – nationally important archaeological sites, their setting and planning protection
• Scheduled Monument Consent – the separate consent regime for works to scheduled monuments

Heritage controls can overlap. A listed building may also sit inside a conservation area and a World Heritage Site, for example. The correct assessment must identify each relevant protection rather than assuming one heritage label covers everything.

Protected landscapes

England’s nationally protected landscapes are principally National Parks, National Landscapes (the statutory Areas of Outstanding Natural Beauty or AONBs), and the Broads.

National Landscapes and National Parks receive the highest status of protection in relation to landscape and scenic beauty under current national planning policy. The Broads has equivalent planning-policy protection but its statutory framework is different and includes the additional purpose of protecting navigation interests.

The statutory duties were strengthened in December 2023. Relevant authorities now have active duties to seek to further the statutory purposes of National Parks and National Landscapes when exercising relevant functions. Development outside a designated boundary can also matter where it would affect the setting of a protected landscape. The current NPPF deals with these issues through policy N4.

These designations do not impose a blanket ban on development. They do, however, affect the weight given to landscape conservation, the approach to major development, design and siting, and sometimes the availability of permitted development rights.

Where landscape effects need more detailed evidence, see our guides to Landscape Character Assessment, Landscape and Visual Impact Assessment (LVIA) and EIA screening and scoping.

Nature conservation and protected sites

Ecological designations use a different legal framework from heritage and landscape protection. Particularly important are Special Protection Areas (SPAs), Special Areas of Conservation (SACs) and Sites of Special Scientific Interest (SSSIs).

SPAs and SACs are protected through the Conservation of Habitats and Species Regulations 2017 as amended. Where a plan or project may have a likely significant effect, alone or in combination with other plans or projects, the competent authority may need to undertake a Habitats Regulations Assessment (HRA). The legal process is not simply a question of how close a proposal is to a site boundary: recreational pressure, nutrient pollution, air pollution, water scarcity, other water effects and functionally linked land can all be relevant.

Ramsar sites, wetlands of international importance, are especially important following changes that came into force in England on 21st May 2026. They are now brought directly into key parts of the Habitats Regulations regime for plans and projects wholly in England, so older policy-only explanations must be read with care.

A Suitable Alternative Natural Greenspace (SANG) is different again: it is mitigation designed to divert recreational pressure away from a protected habitats site. It is not itself a standard national buffer around every SPA.

For trees, see our guides to trees and planning, Tree Preservation Orders and ancient woodland, ancient trees and veteran trees. Wider ecological planning issues also include Biodiversity Net Gain, protected species and the practical question of when ecological surveys can be carried out. If the ecological constraints are not yet clear, our guide to Preliminary Ecological Appraisal (PEA) and EcIA explains the usual starting point.

Permitted development and protected land

A designation does not necessarily mean that all permitted development rights disappear. Different parts of the GPDO use different restrictions and definitions. National Parks, National Landscapes, conservation areas and World Heritage Sites, for example, are among the categories included within Article 2(3) land, while the Broads also has specific treatment in the Order.

For the most common protected-place questions, see our dedicated guides to permitted development in a conservation area, permitted development affecting a listed building, permitted development in a National Landscape (AONB) and permitted development in a National Park.

Other environmental protections work differently. An SSSI is not automatically Article 2(3) land merely because it is an SSSI, and the Habitats Regulations can affect whether development authorised through a planning permission or permitted-development route can lawfully proceed. Always check the particular class and the separate environmental regime rather than relying on the broad label “protected land”.

Finding the designation affecting your site

Start with the local authority’s policies map and online planning constraints map. National designations can often be checked through MAGIC, while Historic England’s National Heritage List for England identifies nationally designated heritage assets. Local lists, conservation areas, Article 4 Directions and TPOs are normally maintained by the local planning authority.

The existence of a designation is only the start of the planning analysis. You then need to identify the development-plan policy, any statutory duty, the relevant national policy and guidance, and any separate consent or assessment regime. That is why the pages in this section are deliberately separated by designation rather than reduced to a single generic “conservation” test.

Conservation, Heritage & Protected Sites

Page Updated: 29th August 2026