How to find planning constraints for any property in England, Wales or Scotland
A step-by-step guide to checking planning constraints before buying land, extending a home or starting a development, with the official sources for each nation and what to ask the council.
Checking a specific site?
Check a site free: your council, whether you are in a conservation area, and a basic flood check. The £9.99 site report covers everything else we can check.
Postcode, address or grid reference. England, Wales and Scotland. Free check, then the site report is £9.99, one-off.
If you are buying a property, extending your home, developing land or simply curious about what restrictions apply to a site, the first job is to check the planning constraints. This guide explains what they are, why they matter, and how to find them in England, Wales or Scotland.
What are planning constraints?
Planning constraints are designations, policies and environmental factors that restrict or influence what you can do with a piece of land. They come from local planning authorities, national government, and heritage and environmental bodies, and they can affect everything from whether you can extend a house to whether a site is suitable for development at all.
Common examples include:
- Conservation areas: areas of special architectural or historic interest where development is more tightly controlled
- Listed buildings: buildings of special interest that cannot be altered without listed building consent
- Flood zones and flood maps: areas at risk of flooding from rivers or the sea. England uses Flood Zones 1, 2 and 3, Wales uses the TAN15 Flood Map for Planning, and Scotland uses SEPA's high, medium and low flood likelihood
- Green belt: land around towns and cities in England where development is tightly restricted to prevent sprawl. Wales has no green belt
- Tree preservation orders (TPOs): individual trees or groups that cannot be cut down without the council's consent
- Sites of Special Scientific Interest (SSSIs): areas protected for their wildlife, geology or other natural features
- Article 4 directions: orders that remove permitted development rights in a defined area
Why do planning constraints matter?
Constraints do not necessarily prevent development, but they shape what is possible. A conservation area means your design needs to suit local character. A flood zone means you may need a flood risk assessment. Green belt means the presumption is against development unless it fits an exception or very special circumstances apply.
For buyers, knowing the constraints early helps you judge the real value and potential of a property. For owners with plans, it helps you ask the right questions before you pay for drawings. For developers and architects, it sets the scope of what can be proposed and the level of scrutiny an application will get.
Finding constraints late can mean delay, extra cost or outright refusal.
Method 1: Check the site with Planning Constraints
Check a site free shows which council covers the address, whether it is in a conservation area, and a basic flood check. The £9.99 site report (one-off) adds the rest: listed buildings, Article 4 directions, trees, green belt, SSSIs and more, with the source for each. It covers everything we can check within 500 m of your pin, for 30 days. The report link never expires.
At an English address the site checker runs up to 54 checks, against 34 in Wales and 53 in Scotland. Each nation is checked against its own publishers, such as planning.data.gov.uk, Historic England and the Environment Agency in England.
- Open the site checker
- Search for a postcode or address, or click the map
- Review the free result and what it says it couldn't check
- Open the site report for the detailed findings, boundaries and source records
We show what we found, what came back clear, and where a source couldn't be checked. Some councils don't publish every dataset, so ask the council where it matters. The report is a screening tool. It is not an official local authority search or professional advice.
Method 2: Check your local planning authority's website
Every local planning authority publishes a constraints map or policies map as part of its local plan. Quality varies. Search for "[your council name] policies map" or "[your council name] planning constraints map". Some councils use dedicated mapping platforms, while others publish static PDFs.
The advantage of the council's map is that it may include local constraints, such as Article 4 directions and locally listed buildings, that national datasets do not always capture.
Method 3: Order a search
If you are buying, your solicitor will order a local authority search (CON29) after your offer is accepted. The council gives an official written response on which constraints apply to the property. It is the most authoritative route, but cost and turnaround vary by council and provider, and it arrives after you have committed. Use it to confirm, not to find out for the first time. Planning Constraints is not a CON29 or an LLC1.
Method 4: Check individual sources directly
You can also go straight to the official sources, which are free:
- England: conservation areas, green belt, TPOs, Article 4 directions: planning.data.gov.uk is the national platform for data that councils publish, with coverage that varies by council
- England: listed buildings and scheduled monuments: the National Heritage List for England from Historic England
- England: flood zones: the Environment Agency's Flood Map for Planning
- England: ancient woodland, SSSIs and National Landscapes: Natural England's MAGIC map
- Wales: DataMapWales and Natural Resources Wales for flood and environmental data, and Cadw for listed buildings and scheduled monuments
- Scotland: SEPA for flood maps, Historic Environment Scotland for heritage, NatureScot for natural heritage, and each council's local development plan
This is free but slow, because you check each source separately.
What to do once you know the constraints
What happens next depends on your situation:
- Buying a property: factor the constraints into your offer and your plans. A house in a conservation area has restricted permitted development. A site in a flood zone may cost more to insure.
- Planning an extension or alteration: check whether you need planning permission. Permitted development rights are reduced in conservation areas and removed by Article 4 directions, and listed buildings need listed building consent. A pre-application enquiry or a lawful development certificate gives you certainty from the council.
- Developing a site: commission specialist reports as needed, such as a heritage statement, flood risk assessment or ecological survey, and discuss the constraints with the council at a pre-application meeting.
Summary
Checking planning constraints early gives you better questions to ask. Check a site free, then open the £9.99 site report for the findings and their sources, and confirm anything important with the council.
Can you extend? Check permitted development and the rules on your street, starting with whether your property is in a conservation area.
Can you extend? Check permitted development and the rules on your street.
Check a site free for your council, whether you are in a conservation area, and a basic flood check. The site report (£9.99, one-off) adds everything else we can check within 500 m of your pin, for 30 days, with the source for each finding.
We show what we found, what came back clear, and where a source couldn’t be checked. Some councils don’t publish every dataset, so ask the council where it matters. Planning Constraints is a screening tool, not an official local authority search or professional advice.