Before submitting a planning application, you need to know whether your site is near any statutory designated ecological sites. Getting this wrong can mean refused applications, costly delays, and even legal consequences.
This guide explains what designated sites are, why they matter for planning, and exactly how to check whether any are near your development.
What Are Statutory Designated Sites?
Statutory designated sites are areas of land or water that are legally protected because of their ecological, geological, or scientific importance. In the UK, the main types are:
International designations:
- SAC (Special Area of Conservation) - designated under the Habitats Directive for specific habitats and species
- SPA (Special Protection Area) - designated under the Birds Directive for rare and migratory birds
- Ramsar sites - internationally important wetlands
National designations:
- SSSI (Site of Special Scientific Interest) - the foundation of nature conservation in the UK, designated for flora, fauna, or geological features
- NNR (National Nature Reserve) - sites of national importance managed for nature conservation
Local designations:
- LNR (Local Nature Reserve) - sites important for local wildlife and community access
Other important designations:
- Ancient Woodland - land continuously wooded since at least 1600 AD, classified as irreplaceable habitat under the NPPF
- National Landscapes (formerly AONBs) - areas of outstanding natural beauty
Why Do Designated Sites Matter for Planning?
The National Planning Policy Framework (NPPF) gives designated sites specific protection in the planning system:
European sites (SAC, SPA, Ramsar): The highest level of protection. Any development likely to have a significant effect on a European site requires a Habitats Regulations Assessment (HRA). This can apply even when the development is several kilometres away, depending on the potential impact pathway (e.g. water pollution, air quality, recreational pressure).
SSSIs: Development proposals that would damage a SSSI should not be approved unless the benefits clearly outweigh the impacts (NPPF paragraph 186). Natural England must be consulted on any proposal likely to affect a SSSI.
SSSI Impact Risk Zones (IRZs): Natural England has defined Impact Risk Zones around every SSSI in England. These zones specify which types of development require consultation with NE based on the features the SSSI is designated for. For example, a residential development of 100+ units within 2km of a SSSI designated for bats may trigger a consultation requirement.
Ancient Woodland: The NPPF states that development resulting in the loss or deterioration of irreplaceable habitats such as Ancient Woodland should be refused unless there are wholly exceptional reasons. Natural England recommends a minimum 50m buffer between development and Ancient Woodland.
How to Check: Three Methods
Method 1: MAGIC Map (Free, Manual)
Go to magic.defra.gov.uk and navigate to your site location. Enable the relevant layers:
- Toggle on Designations > Statutory to see SSSIs, SACs, SPAs, Ramsar, NNRs
- Toggle on Designations > Local to see LNRs
- Toggle on Habitats > Ancient Woodland Inventory for Ancient Woodland
- Toggle on Habitats > Priority Habitat Inventory for Priority Habitats
- Toggle on SSSI Impact Risk Zones to check consultation requirements
Use the measurement tool to check distances from your site boundary to nearby designations.
Pros: Free, official source, authoritative data Cons: Slow interface, layers are buried in nested menus, England-focused, one site at a time
Method 2: Natural England Open Data Geoportal (Free, Technical)
Go to naturalengland-defra.opendata.arcgis.com for the raw GIS data. You can download designation boundaries as shapefiles or query them via ArcGIS REST API.
Pros: Direct access to authoritative datasets, programmable Cons: Requires GIS knowledge, not user-friendly for non-technical users
Method 3: EcoCheck (Instant)
Enter your grid reference, postcode, or coordinates into EcoCheck with your chosen buffer radius (500m to 5km). Results include every SSSI, SAC, SPA, Ramsar, NNR, LNR, Ancient Woodland, Priority Habitat, and GCN Risk Zone within the buffer - plus SSSI condition assessments and protected species records from NBN Atlas.
Works for England, Scotland, and Wales in a single search.
Pros: All data sources in one search, results in seconds, includes species records Cons: Subscription required after free trial
What to Do If Designated Sites Are Found
If your search identifies designated sites near your development:
Within the site boundary: You almost certainly need an ecological assessment. Development directly affecting a SSSI, SAC, or Ancient Woodland faces significant constraints and may not be permitted.
Adjacent to the site: Potential for indirect impacts (noise, light, dust, drainage, disturbance). A Preliminary Ecological Appraisal should assess whether impacts are likely and recommend mitigation.
Within the search buffer but not adjacent: Check whether SSSI Impact Risk Zones are triggered for your development type and scale. European sites (SAC/SPA) may require HRA screening even at considerable distances.
Ancient Woodland nearby: Check whether a 50m buffer would overlap with your development footprint. Consider whether construction phase impacts (root damage, changes to hydrology, increased public access) could affect the woodland.
In all cases, commission a PEA from a qualified ecologist. The ecologist will assess the specific impacts of your proposals and advise on survey requirements, mitigation, and whether consultation with Natural England or NatureScot is needed.
Scotland and Wales
If your site is in Scotland, designated site data is available through NatureScot Sitelink (sitelink.nature.scot). MAGIC Map's Scottish coverage is incomplete.
If your site is in Wales, use DataMapWales (datamap.gov.wales) for NRW designation data.
EcoCheck queries all three countries' data sources automatically, so you get a complete picture regardless of which side of the border your site falls on.
Don't Wait for the LPA to Ask
The most common mistake developers make is submitting a planning application without ecological information, then being asked by the LPA to provide it retrospectively. This causes delays of weeks or months.
Check for designated sites and ecological constraints early - ideally before you finalise your development design. If you know there's a SSSI 500m away and bat records within 1km, you can factor survey costs and timelines into your project plan from the start.
A quick search on EcoCheck takes seconds and gives you the full constraints picture before you spend money on architects or planning consultants.
Patrick O'Connor is a Freelance Ecologist at Kinterra Consulting and the developer of EcoCheck - an instant ecological desktop assessment tool for any GB location. Try it free for 3 days at ecocheck.co.