Planning Constraints to Check Before You Buy Land or a Building

Check the designations that need extra consent or make planning permission harder: listed buildings, conservation areas, Article 4 directions, tree preservation orders, green belt, flood zones, nature sites such as SSSIs, scheduled monuments and National Landscapes. Each is set by a different body, and each changes what you can build, alter or demolish.

Works to demolish a listed building, or to alter or extend it in a way that affects its special character, need listed building consent, and doing them without consent is a criminal offence. Protection covers the whole building, inside and out, and can extend to objects fixed to it and to older structures within its curtilage, in place since before 1 July 1948.

• Grade I: buildings of exceptional special interest.
• Grade II*: particularly important buildings of more than special interest.
• Grade II: buildings of special interest, warranting every effort to preserve them.

The offence can lead to a fine, imprisonment or both. Ask the seller for the consents behind past alterations, and read the official list entry, which can state that some parts or features are not included. A map point or outline for a listed building does not show the legal extent of what is protected.

Councils designate conservation areas: parts of their area of special architectural or historic interest whose character or appearance it is desirable to preserve or enhance. Inside one, permitted development rights are narrower and demolishing a building generally needs planning permission. An Article 4 direction goes further, withdrawing named permitted development rights across a defined area.

• Conservation areas are article 2(3) land, with National Parks, Areas of Outstanding Natural Beauty, the Broads and World Heritage Sites, where permitted development is more restricted.
• Demolishing an unlisted building in a conservation area without permission is an offence, with exceptions for very small buildings.
• An Article 4 direction can be made by the council or the Secretary of State, and it lists the rights it removes. Read it before planning any change that would normally not need an application.

Check for tree preservation orders and conservation areas. A tree preservation order makes it an offence to cut down, top, lop, uproot, wilfully damage or wilfully destroy a protected tree without the council's written consent, and cutting roots counts too. In a conservation area, most work on trees needs six weeks' notice to the council.

Confirmed orders are recorded in the local land charges register as a charge on the land, so a local search should reveal them, and councils keep copies for public inspection. On a development site, protected trees can limit where you can build, so commission a tree survey early.

Green belt is land that national policy keeps open. Under the 2026 National Planning Policy Framework, inappropriate development in the green belt should not be approved except in very special circumstances, and harm to the green belt, including to its openness, is given substantial weight against a proposal.

Policy GB7 lists development that is not inappropriate, including:

• buildings for agriculture, horticulture or forestry;
• extending, altering or replacing a permanent, lawful building within proportionate limits;
• limited infilling in villages, and limited affordable housing for local needs;
• redeveloping previously developed land without substantial harm to openness;
• development on grey belt land that meets four conditions, including an evidenced unmet need and a sustainable location.

Yes. Under the 2026 National Planning Policy Framework, every development proposal in flood zones 2, 3a or 3b needs a site-specific flood risk assessment, and the sequential test steers new development to the areas at lowest risk of flooding from any source. Zone 1 sites of one hectare or more also need an assessment.

Flood zones ignore defences, so read them with the Environment Agency's likelihood maps. Our guide on checking flood risk for a property explains both.

The strongest are Sites of Special Scientific Interest, habitats sites, irreplaceable habitats such as ancient woodland, scheduled monuments and National Landscapes. Each carries its own consent regime or a strong national policy against harmful development, and the owner of the land takes on duties that come with it.

Sites of Special Scientific Interest

Natural England notifies land as an SSSI for its wildlife, geology or landform. Owners and occupiers need its written consent before any operation on the site's list, and doing one without consent can bring an unlimited fine. All SSSIs in England are on the land charges register, and Natural England must be told of a sale within 28 days.

Habitats Sites and Ancient Woodland

Habitats sites include Special Areas of Conservation, Special Protection Areas and Ramsar sites. The 2026 NPPF says development affecting one should be refused unless tests such as an appropriate assessment are met, and that the loss or deterioration of irreplaceable habitats, including ancient woodland, should be refused unless there are wholly exceptional reasons.

Scheduled Monuments

It is an offence to carry out works that demolish, damage, remove, repair, alter or add to a scheduled monument, or to flood or tip on land containing one, without scheduled monument consent from the Secretary of State.

National Landscapes

Areas of Outstanding Natural Beauty have been called National Landscapes since 22 November 2023, but the legal designation is still AONB. The 2026 NPPF treats them, with National Parks and the Broads, as Protected Landscapes, where major development should be refused other than in exceptional circumstances.

No. The national Planning Data platform (planning.data.gov.uk) only holds what has been published to it. National bodies supply listed buildings, SSSIs and similar designations, but Article 4 directions, tree preservation orders and green belt come from each council, conservation areas mostly from councils with some from Historic England, and not every council has published every dataset.

• The platform describes its conservation area dataset as a work in progress that is currently incomplete, mixing some council data with data from Historic England and other sources.
• The service is sometimes unavailable: it was not answering when Bozmaps made its EV example runs on 9 November 2026.
• HM Land Registry's local land charges search, which records conservation areas, listed buildings and tree preservation orders, does not yet hold every council's data either.

So when a check finds nothing, ask whether the council has published that dataset at all. If it has not, use the council's own planning map, its local plan and your solicitor's local authority search.

Maps screen a site; they do not replace searches or advice. Before exchange, your solicitor's local authority search and the local land charges register confirm designations, orders and planning history. A planning consultant can judge what consent is realistic, and a surveyor or heritage specialist can assess the building itself.

• the council's planning history for the site and its neighbours;
• the local plan policies map, which shows allocations and local designations the national data may not hold;
• the official list entry for any listed building, and the consents for past works;
• Natural England's MAGIC map or designated sites system for an SSSI's boundary and list of operations.

The Bozmaps planning constraints check looks for 23 national datasets on a site and within a search distance, 250 m unless you set another. It reads designations from the Planning Data platform and flood zones from the Environment Agency's current Flood Map for Planning, and gives the straight-line distance to each.

• None or not published: when a council-published dataset has nothing nearby, the check asks the platform whether that council has published the dataset anywhere. If it has not, the report says so instead of reporting none.
• It stops rather than guesses: if the platform cannot say which council covers the site, the check stops, because it could not tell none found from not published.
• What you get: a map, a table of what is on the site and nearby, and a report naming every source and date.
• Limits: England only; a postcode gives a point or circle, not the legal boundary; a screening, not a local search or legal advice.

It runs on the Bozmaps engine, so on this site we run it for you: request a site report. The live property risk check also flags seven designations at one address, including conservation areas, Article 4 directions and listed buildings within 25 m, and marks any the council has not published.