In former coal-mining areas of England, Scotland, and Wales, an extension, outbuilding, or ADU can raise questions about mine entries, shallow workings, coal seams, mine gas, water, or ground movement. The Mining Remediation Authority’s map is a screening route. It does not decide whether an individual project needs a technical assessment or permit.
Use the right record for the proposed work
Check the Authority’s coal-mining map for the property and proposed footprint. If the home is in a development high-risk area, follow the Authority’s homeowner guidance and ask the local planning authority or building-control body whether a development-specific Coal Mining Risk Assessment (CMRA) is required. A CMRA is prepared by a qualified professional and considers the development and site information. A conveyancing CON29M report is for property-purchase information; the Authority says it should not be used to prepare a CMRA.
The Authority does not approve the householder’s proposal or conduct the owner’s investigation and remediation. A consultant’s technical report, a CMRA requested for development, and a conveyancing report serve different purposes. Confirm which one the decision-maker needs before ordering a report.
Check whether work needs a separate Authority permit
Planning permission and building-regulations approval are separate from a Mining Remediation Authority permit. The Authority says a permit is required before work that could disturb or enter coal seams or affect historic workings or mine entries. Foundations, drainage, or other ground works may intersect Authority property. Removing coal can also require an incidental coal agreement. Describe the exact excavation and proposed location to the Authority and confirm the current permit and agreement requirements before starting.
Keep the map result, report purpose, professional findings, local authority request, and any permit or agreement together. A map result is not a finding that the ground is safe, and a report does not replace a permit where one is required. This page does not determine whether a particular ADU needs an assessment, permit, or remediation. Other ground-stability products are described in Great Britain ground-stability map checks.