Legal · Attribution

Licences & Data Attribution

Everything the Planning Constraints Checker renders comes from someone else’s published data. This page lists every source, the licence it is used under, and the attribution we owe back. The constraint-layer table is generated from the same source register the tool itself reads, so a layer cannot be added to the product without appearing here.

Summary

We screen against 131 constraint layers from 30 publishers (a further 2 are registered and not currently called — each is named below), plus the ownership, parcel, school and mapping sources listed further down. Most of it is published under the Open Government Licence v3.0, which permits commercial use provided the source is attributed. 10 sets of terms are not the Open Government Licence, and each is described in full below:

  • James Hutton Institute Open Data LicenceThe James Hutton Institute
  • CC BY 4.0European Commission, Joint Research Centre (PVGIS)
  • Terms not yet established — layer not calledDepartment for Transport / HS2 Ltd
  • Open data (per source authority)PlanIt (planit.org.uk) and the originating planning authorities; PlanIt — area watches and committee sweeps
  • Varied / Derived — terms not yet confirmedWelsh Government / Llywodraeth Cymru — Coal Tip Safety programme
  • HM Land Registry CCOD/OCOD licence (bespoke — not the Open Government Licence)HM Land Registry — corporate & overseas ownership (CCOD / OCOD)
  • Open Database Licence (ODbL) 1.0OpenStreetMap contributors — Nominatim geocoder; OpenStreetMap contributors — screen basemaps (OpenFreeMap, OSM tiles)
  • Environment Agency open data — the service states Fees: NONEEnvironment Agency — LIDAR Composite hillshade (basemap)
  • Terms not established by usEsri — World Imagery (satellite basemap)
  • Council copyright — quoted, not republishedLocal planning authorities — appraisal and policy documents

Results are advisory — for a regulated decision, verify with the local planning authority or the data publisher.

Constraint layers

Generated from the source register at build time — one entry per publisher and licence, with the layers we call under it and the nations each covers. For the same register read the other way round — one row per layer, with its tier, its coverage and how it refreshes — see every layer we check.

Natural Resources Wales / Cyfoeth Naturiol Cymru

17 layers · Wales
Licence
OGL v3.0
Attribution
© Natural Resources Wales and database right 2026. Contains public sector information licensed under the Open Government Licence v3.0. Contains Ordnance Survey data © Crown copyright and database right 2026.
Layers
National Park (Wales) · Area of Outstanding Natural Beauty (Wales) · Site of Special Scientific Interest (Wales) · Special Area of Conservation (Wales) · Special Protection Area (Wales) · Ramsar Site (Wales) · National Nature Reserve (Wales) · Local Nature Reserve (Wales) · Ancient Woodland (Wales) · Heritage Coast (Wales) · Flood Map for Planning — Rivers and Sea (Wales) · Flood Map for Planning — Surface Water (Wales) · TAN15 Defended Zone (Wales) · Historic Flood Map (Wales) · Statutory Main River (Wales) · Groundwater Source Protection Zone (Wales) · Phosphate-Sensitive SAC Catchment (Wales)

planning.data.gov.uk (MHCLG) and English local planning authorities

15 layers · England
Licence
OGL v3.0
Attribution
© Crown copyright and database right 2026. Contains public sector information licensed under the Open Government Licence v3.0.

Scottish Environment Protection Agency (SEPA)

11 layers · Scotland
Licence
OGL v3.0
Attribution
© SEPA 2026. This SEPA product is licensed under the Open Government Licence v3.0.

Historic England, via planning.data.gov.uk (MHCLG)

9 layers · England
Licence
OGL v3.0
Attribution
© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on the date of this screening. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

Environment Agency

9 layers · England
Licence
OGL v3.0
Attribution
© Environment Agency copyright and/or database right 2026. All rights reserved. Contains public sector information licensed under the Open Government Licence v3.0.

Cadw (Welsh Government / Llywodraeth Cymru)

9 layers · Wales
Licence
OGL v3.0
Attribution
© Crown copyright and database right 2026 Cadw, Welsh Government (Llywodraeth Cymru). Contains public sector information licensed under the Open Government Licence v3.0.
Layers
Listed Building (Wales) · Conservation Area (Wales) · Scheduled Monument (Wales) · Scheduled Monument Constraint Area (Wales) · World Heritage Site (Wales) · World Heritage Site Essential Setting (Wales) · Registered Park or Garden (Wales) · Registered Historic Landscape (Wales) · Protected Wreck Site (Wales)

Historic Environment Scotland

9 layers · Scotland
Licence
OGL v3.0
Attribution
Contains Historic Environment Scotland and Ordnance Survey data © Historic Environment Scotland – Scottish Charity No. SC045925 © Crown copyright and database right 2026. Contains public sector information licensed under the Open Government Licence v3.0.

NatureScot

8 layers · Scotland
Licence
OGL v3.0
Attribution
© NatureScot. Contains public sector information licensed under the Open Government Licence v3.0. Contains Ordnance Survey data © Crown copyright and database right 2026.

Natural England, via planning.data.gov.uk (MHCLG)

7 layers · England
Licence
OGL v3.0
Attribution
© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.

Welsh Government / Llywodraeth Cymru (DataMapWales)

6 layers · Wales
Licence
OGL v3.0
Attribution
© Crown copyright and database right 2026 Welsh Government (Llywodraeth Cymru). Contains public sector information licensed under the Open Government Licence v3.0.
Layers
Predictive Agricultural Land Classification (Wales) · Local Authority (Wales) · Air Quality Management Area (Wales) · Road Noise (Wales) · Rail Noise (Wales) · Industrial Noise (Wales)

The Improvement Service (Spatial Hub) and Scottish local authorities

6 layers · Scotland
Licence
OGL v3.0
Attribution
© The Improvement Service and Scottish local authorities. Published under a UK Open Government Licence (OGL) v3.0. This dataset was amalgamated, optimised and published by the Improvement Service Spatial Hub using data provided by Scottish Local Authorities.

Office for National Statistics, via planning.data.gov.uk (MHCLG)

4 layers · England
Licence
OGL v3.0
Attribution
Source: Office for National Statistics licensed under the Open Government Licence v3.0. Contains OS data © Crown copyright and database right 2026.

Scottish Government

4 layers · Scotland
Licence
OGL v3.0
Attribution
© Scottish Government, contains Ordnance Survey data © Crown copyright and database right 2026. Available under the terms of the Open Government Licence v3.0.

Department for Environment, Food & Rural Affairs (Defra)

2 layers · England
Licence
OGL v3.0
Attribution
© Department for Environment, Food & Rural Affairs copyright and/or database right 2023
Layers
Road Noise · Rail Noise

The James Hutton Institute

2 layers · Scotland
Attribution
Land Capability for Agriculture copyright and database right The James Hutton Institute 2025. Used with the permission of The James Hutton Institute. All rights reserved. Any public sector information contained in these data is licensed under the Open Government Licence v.2.0.

Natural England — designated sites

1 layer · England
Licence
OGL v3.0
Attribution
© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.

Ordnance Survey OpenData, via planning.data.gov.uk (MHCLG)

1 layer · England
Licence
OGL v3.0
Attribution
Contains Ordnance Survey data © Crown copyright and database right 2026. Your use of OS OpenData is subject to the terms at https://os.uk/opendata/licence.

Historic England — National Heritage List for England

1 layer · England
Licence
OGL v3.0
Attribution
© Crown copyright 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. Released under the Open Government Licence v3.0.

Mining Remediation Authority (formerly the Coal Authority)

1 layer · England, Wales and Scotland
Licence
OGL v3.0
Attribution
© Mining Remediation Authority 2026. Contains public sector information licensed under the Open Government Licence v3.0.

Natural England — Ancient Woodland Inventory

1 layer · England
Licence
OGL v3.0
Attribution
© Natural England 2026; © Crown copyright and database rights 2026 Ordnance Survey AC0000851168. © 2015 Getmapping plc and Bluesky International Ltd; © Woodland Trust; © Forestry Commission; contains, or is based on, information supplied by the Forestry Commission. © Crown copyright and database right 2026 Ordnance Survey 100021242; © and database right Crown copyright and Landmark Information Group Ltd, all rights reserved 2026; © Ancient Tree Hunt.

Natural England — SSSI Impact Risk Zones

1 layer · England
Licence
OGL v3.0
Attribution
© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.

Natural England — nutrient neutrality catchments

1 layer · England
Licence
OGL v3.0
Attribution
© Natural England copyright and/or database right 2023. All rights reserved. Contains data supplied by or derived from Natural England, Ordnance Survey, Environment Agency, Somerset County Council, East Riding of Yorkshire Council, Borough Council of King's Lynn and West Norfolk, Breckland Council, Broadland & South Norfolk Council, North Norfolk District Council, Norwich City Council, Great Yarmouth Borough Council and The Broads Authority.

Department for Environment, Food & Rural Affairs (Defra), via planning.data.gov.uk (MHCLG)

1 layer · England
Licence
OGL v3.0
Attribution
© Crown copyright and database rights 2026 licenced under Defra's Public Sector Mapping Agreement with Ordnance Survey (licence No. 100022861).

European Commission, Joint Research Centre (PVGIS)

1 layer · England
Licence
CC BY 4.0
Attribution
European Commission, Joint Research Centre (PVGIS)
Layers
Solar Yield (PVGIS)

Department for Transport / HS2 Ltd

0 layers · England
Attribution
© Department for Transport and HS2 Ltd. Licence terms not yet established; this layer is registered but not queried.
Layers
Registered but not currently called: HS2 Safeguarded Area. These appear here so the list stays a complete account of the register; nothing is queried from them today.

PlanIt (planit.org.uk) and the originating planning authorities

1 layer · England, Wales, Scotland and Northern Ireland
Attribution
Planning application data via PlanIt (planit.org.uk), aggregated from the registers of the originating local planning authorities. © the originating planning authority.
Layers
Planning Application History

RCAHMW (Royal Commission on the Ancient and Historical Monuments of Wales)

1 layer · Wales
Licence
OGL v3.0
Attribution
This site data is from the Inventory of Historic Battlefields in Wales, produced by the Royal Commission on the Ancient and Historical Monuments of Wales (RCAHMW). © Crown Database Right: RCAHMW, licensed under the Open Government Licence 3.0.
Layers
Historic Battlefield (Wales)

Welsh Government / Llywodraeth Cymru — Coal Tip Safety programme

0 layers · Wales
Attribution
© Welsh Government (Llywodraeth Cymru) — Coal Tip Safety programme.
Layers
Registered but not currently called: Disused Coal Tip (Wales). These appear here so the list stays a complete account of the register; nothing is queried from them today.

NatureScot and the James Hutton Institute

1 layer · Scotland
Licence
OGL v3.0
Attribution
© NatureScot and the James Hutton Institute. Contains public sector information licensed under the Open Government Licence v3.0.

National Records of Scotland

1 layer · Scotland
Licence
OGL v3.0
Attribution
© National Records of Scotland, contains Ordnance Survey data © Crown copyright and database right 2026. Available under the terms of the Open Government Licence v3.0.

Ownership, parcels, schools and mapping

Sources that are not constraint layers, and so are not in the register above. Each was checked against our own data reference, named on the entry.

HM Land Registry — corporate & overseas ownership (CCOD / OCOD)

Source

Corporate and overseas ownership of registered title in England and Wales. It appears on free, public pages — the ownership overview, the per-district ownership pages, the company pages and the parcel context on the map — and inside paid reports. Shown at postcode-district level: proprietor name, country of incorporation, proprietorship category and title counts. The data month is displayed wherever ownership appears.

Attribution
Information produced by HM Land Registry. © Crown copyright 2026
Note
Free to licence, with no tiers and no expiry — but not open data. Its conditions flow down to you through our Terms: no redistribution as a standalone dataset, no direct marketing to registered proprietors, no sub-licensing onward. We never publish property addresses (licence §3.2, a Royal Mail / Ordnance Survey restriction on non-PSGA holders). This is a screening indicator, not proof of ownership and not an official copy of the register. There is no equivalent for Scotland: the register there is kept by Registers of Scotland.
Checked
Data reference §1

HM Land Registry — INSPIRE Index Polygons

Source

Registered freehold title boundaries for England and Wales, drawn as the parcel layer on the map and used to snap a site boundary. We host our own copy and serve it through our own API.

Attribution
Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. © Crown copyright and database rights 2026 Ordnance Survey AC0000851063
Note
Genuinely open, and unrelated to the ownership licence above. Attribution is dual — the Ordnance Survey line is required as well as HM Land Registry’s, because the polygons are derived from OS mapping. HM Land Registry publishes new files on the first Sunday of each month; the copy we currently serve was built on 3 July 2026 and our automated monthly rebuild has not yet completed a publish, so treat the parcel layer as that vintage rather than as this month’s. Title boundaries are indicative and are not a legal property boundary; leasehold parcels and unregistered land are not included.
Checked
Data reference §2

Department for Education — Get Information about Schools (GIAS)

Source

School locations, phase, type, Ofsted rating and capacity, used to list the nearest primary and secondary schools by straight-line distance. We host our own copy, refreshed from the GIAS establishment download.

Note
England only — GIAS is an English register, and we say so rather than rendering an empty layer in Wales or Scotland. Straight-line distance only: not catchment and not admissions data, both of which are set by each school and local authority and change annually.
Checked
Data reference §3

Companies House

Source

Company status, incorporation date, registered-office locality and filing history, shown on company pages and in ownership alerts.

Note
Companies House publishes its public data under the Open Government Licence, and that is how we record it — but the terms-of-use page we checked returned a 404, so we hold no primary evidence of it. We would rather say that than imply a licence we have not read.
Checked
Data reference §3.10

PlanIt — area watches and committee sweeps

Source

Planning applications from the originating local planning authorities, aggregated by PlanIt. Used both for the planning-history layer in a survey (listed in the layer table above) and for the daily area-watch and committee sweeps.

Note
Proxied, never mirrored: nothing from PlanIt is stored beyond an application reference and the display-safe fields inside an alert. PlanIt does not publish a numeric rate limit, so the daily sweep is deliberately small and stops entirely on a 429.
Checked
Data reference §3.7, §3.8

OpenStreetMap contributors — Nominatim geocoder

Source

The address search box. Anything that is not a postcode is geocoded by OpenStreetMap’s Nominatim service, filtered to Great Britain.

Attribution
© OpenStreetMap contributors
Note
OpenStreetMap data is licensed under the ODbL, which requires the credit above wherever the results are shown. Postcodes are resolved by postcodes.io (ONS/OS-derived, Open Government Licence v3.0) instead.
Checked
Data reference §3 (Nominatim/OSM), §3.13 (postcodes.io)

Ordnance Survey — OS Maps API (Open Zoomstack)

Source

The house basemap, and the only basemap printed into a report figure or an exported plan.

Attribution
Contains OS data © Crown copyright and database right 2026
Note
The OpenData plan covers zoom levels 7 to 16; above that the tiles are Premium data and we do not request them. Ordnance Survey data also sits inside many of the layers above, redistributed by the publisher under their own licence.
Checked
Data reference §3.28

OpenStreetMap contributors — screen basemaps (OpenFreeMap, OSM tiles)

Source

The Liberty, Bright, Positron and OpenStreetMap basemap options in the map view.

Attribution
© OpenStreetMap contributors
Note
On-screen options. The OpenStreetMap Foundation’s tile policy carries no service guarantee for commercial use, which is why these are choices a user makes rather than something the product depends on, and why report figures are drawn on Ordnance Survey tiles instead.
Checked
src/components/map/basemaps.ts

Environment Agency — LIDAR Composite hillshade (basemap)

Source

The terrain-shaded basemap option, proxied from the EA’s WMS.

Attribution
Contains Environment Agency information © Environment Agency and/or database right
Note
England only — the composite stops at the border, and we do not request tiles beyond it.
Checked
Data reference §3

Esri — World Imagery (satellite basemap)

Source

The satellite basemap option, on screen only.

Attribution
Esri, Maxar, Earthstar Geographics
Note
We have not established the terms on which this imagery may be used, so it is offered as an on-screen aid only and is never printed into a report or an exported plan. If you need aerial imagery in a deliverable, licence it directly from Esri or another supplier.
Checked
src/components/map/basemaps.ts — recorded there as terms not established

Doogal (ONS Postcode Directory / OS Code-Point Open derived)

Source

Postcode district names, centroids and population figures, used to build the per-district area pages.

Attribution
Contains OS data © Crown copyright and database right 2026. Contains public sector information licensed under the Open Government Licence v3.0
Note
District centroids and population figures are indicative and aggregated — they say nothing about an individual address. Screen a specific site with the free checker instead.
Checked
scripts/build-postcode-districts.mjs

Local planning authorities — appraisal and policy documents

Source

Conservation area appraisals, management plans and similar documents, summarised by an AI digest with short quotes so a claim can be checked against the source.

Note
We store the digest and short verification quotes, never the document. Every digest links back to the council’s own copy, which is the authoritative text.
Checked
Data reference §3

Layer table generated from the source register · other entries last reviewed 2026-08-26

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