Coal mining risk areas and the referral requirement
Coalfield councils will not validate an application in a Development High Risk Area without a Coal Mining Risk Assessment. The free check, the report contents, mine entry zones and Coal Authority permits.
If your site sits in a Development High Risk Area, the council will expect a Coal Mining Risk Assessment with the planning application, and it will refuse to validate the submission without one. Many local planning authorities in England carry coalfield legacy, and in those districts the requirement appears on the local validation checklist rather than in national legislation. That is why self-builders keep meeting it as a surprise at the registration stage.
The check that tells you whether it applies takes about two minutes and costs nothing.
Where the requirement comes from
Two things combine. The National Planning Policy Framework expects development to be safe and to remain stable, and puts the responsibility for securing safe development on the applicant. Local plans in coalfield districts then translate that into a policy on land instability, and the validation checklist turns the policy into a document requirement.
Alongside that, the Coal Authority is a statutory consultee for applications in a Development High Risk Area under the consultation provisions of the Town and Country Planning (Development Management Procedure) (England) Order 2015. Its response carries weight, and an objection on land stability grounds is not one officers work around.
The area boundaries are drawn from records of shallow workings, recorded mine entries, historic surface hazards and other coal related features. They are not a guess about geology. They mark places where the Coal Authority holds records showing a credible risk.
Checking whether your site is in a high risk area
Use the Coal Authority's own map viewer before you commission anything. It shows Development High Risk Area boundaries against an address search, and it tells you which of the coal legacy features are recorded nearby.
Three outcomes are possible.
The site is outside a Development High Risk Area, in which case no assessment is normally required, though a coalfield district may still ask a screening question on the application form.
The site is inside a Development High Risk Area, in which case a Coal Mining Risk Assessment is required for most development, with limited exemptions for minor works that some authorities set out in their checklist.
The site is inside and also within the zone of influence of a recorded mine entry, in which case the assessment will almost certainly recommend intrusive site investigation before you get a decision.
Order the coal mining report early. The desk records it contains drive everything that follows, and waiting until the architect has finished the drawings wastes the opportunity to move a building away from a shaft.
What a Coal Mining Risk Assessment contains
The document is a desk study with an interpretive conclusion. A competent version covers a defined list.
- The site setting and the proposed development, including foundation type and any basement or piling.
- Recorded and probable shallow coal workings, with seam names, depths and the likely method of working.
- Recorded mine entries, shafts and adits, with their positions and the accuracy of those positions.
- Coal outcrops within and near the site, since outcrop workings are often the shallowest and least recorded.
- Mine gas potential, including carbon dioxide and methane migration pathways.
- Spoil heaps, historic surface features, opencast backfill and any recorded surface hazards.
- Past and present surface stability issues in the surrounding area.
- A conclusion stating whether intrusive investigation is needed, and if so what form it should take.
The conclusion is the part the Coal Authority reads first. An assessment that recites the records and then stops without an interpretation gets a holding objection.
Authors matter. Coalfield councils expect the assessment to be prepared by someone with relevant ground engineering experience, and the Coal Authority's responses regularly comment on the competence of the author. This is not a document PlanScope produces, and it is not one to draft from a template. Where you do need the wider ground evidence written up, a geotechnical assessment drafted in advance gives your engineer a structure to work from, and for specialist technical reports, qualified professional input may be required.
Mine entries and the zone of influence
A recorded shaft brings a zone of influence around it, and the standard working assumption in coalfield practice is a radius based on the shaft depth and the ground conditions, with a default figure applied where better information is absent. Building inside that zone is possible but expensive, because it means locating the entry accurately, capping it to a modern standard and agreeing the works with the Coal Authority.
The bigger problem is positional accuracy. Many recorded entries are plotted from nineteenth century abandonment plans, so the true position can differ from the record by a considerable margin. That is why site investigation to locate a shaft is a separate exercise from investigating the ground.
Illustrative example: a self-builder buys a plot for a single dwelling in a former mining village. The coal mining report shows one recorded shaft near the rear boundary. Relocating the house eight metres forward, within the same plot, moved the footprint clear of the assumed zone of influence and removed the need for a treatment scheme. The change cost a redrawn site plan.
Permits before anyone drills
Any intrusive activity that enters coal seams, coal mine workings or Coal Authority property needs a permit from the Coal Authority under the Coal Industry Act 1994. That covers boreholes, probe drilling, piling into workings, shaft treatment and grouting.
The permit is separate from planning permission and separate from the Building Regulations. Applying for it takes time, so build it into the programme rather than discovering it when the rig is booked. Drilling without a permit is an offence, and it is also the fastest way to find yourself liable for a subsidence claim you could have avoided.
Where this sits in the ground evidence
Coal risk is one strand of a wider ground picture, and the strands are best commissioned together.
| Question | Document | Standard or regime |
|---|---|---|
| Is there coal legacy risk | Coal Mining Risk Assessment | Coal Authority guidance and the local validation list |
| Is the land contaminated | Phase 1 desk study, then Phase 2 | BS 10175:2011, by suitably qualified people |
| Will the ground carry the building | Ground investigation and geotechnical report | BS 5930 and Eurocode 7 |
| Is there gas risk | Ground gas monitoring | CIRIA C665 and BS 8485 |
One site investigation can answer all four if it is scoped that way. Two separate visits, one for contamination and one for coal, is the classic small site mistake, and the second visit costs nearly as much as the first.
Where the council asks for contamination work as well, a contaminated land assessment has to be prepared in accordance with BS 10175 by suitably qualified and experienced people, so treat any AI-assisted draft as the starting point that specialist works from.
This is general guidance rather than legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
Enter your postcode on PlanScope to see which supporting documents your site is likely to need alongside the ground investigation. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
How do I know if my site is in a coal mining risk area?
Use the Coal Authority's map viewer, which shows Development High Risk Area boundaries against an address search and lists the recorded coal legacy features nearby. The check is free and takes a couple of minutes. If the site falls inside the boundary, most coalfield councils require a Coal Mining Risk Assessment before they will validate an application.
What goes into a Coal Mining Risk Assessment?
The site setting and proposed foundations, recorded and probable shallow workings with seam depths, recorded mine entries and their positional accuracy, coal outcrops, mine gas potential, spoil heaps and historic surface features, and a conclusion on whether intrusive investigation is needed. The interpretive conclusion matters most, because a records recital without it attracts an objection.
Is the Coal Authority a statutory consultee?
Yes, for applications in a Development High Risk Area, under the consultation provisions of the Development Management Procedure Order 2015. Its response carries real weight with case officers, and an objection on land stability grounds is rarely worked around. Engaging early, before the layout is fixed, produces better outcomes than responding to an objection later.
Do I need a permit to drill boreholes on a coalfield site?
Yes, where the work enters coal seams, coal mine workings or Coal Authority property. A permit under the Coal Industry Act 1994 covers boreholes, probe drilling, piling into workings, shaft treatment and grouting. It is separate from planning permission and takes time to obtain, so allow for it in the site investigation programme.
Can I build near a recorded mine shaft?
Sometimes, but it is expensive. A recorded entry carries a zone of influence around it, and building inside that zone means locating the shaft accurately, treating and capping it to a modern standard, and agreeing the works with the Coal Authority. Moving the footprint clear of the zone is usually the less costly answer.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.