Approximately 8 million properties across England, Scotland, and Wales (roughly one in five homes) sit within the Coal Authority's defined coalfield areas, where historical mining activity could affect ground stability and property safety. HouseCheckup's £24.99 property reports include mining risk assessment data, flagging whether a property is in a mining-affected area and the level of risk. That is information that would otherwise only emerge through a specific Coal Mining Search costing £40-55 during the conveyancing process.
Understanding Coal Mining Risk
Coal has been mined in the UK for centuries, leaving a legacy of underground workings, shafts, and geological disturbance beneath millions of properties. The main risks to property from coal mining are:
1. Ground Subsidence
When underground mine workings collapse or settle over time, the ground above can sink or shift. This manifests as:
- Structural cracking in buildings
- Uneven or sloping floors
- Damage to drains and underground services
- Garden depressions or sudden sinkholes
Most coal mining subsidence in the UK has already occurred (within 20-30 years of mining), but some risks persist, particularly from shallow workings and unrecorded mines.
2. Mine Entries (Shafts and Adits)
The Coal Authority has recorded over 100,000 mine entries (vertical shafts and horizontal adits) across the UK. Many more remain unrecorded. Risks include:
- Shaft collapse: Old shaft caps deteriorating, creating sudden voids
- Proximity to buildings: Properties built unknowingly close to or over mine entries
- Methane emission: Mine gas escaping through poorly sealed shafts
3. Mine Gas
Disused mines can produce methane, carbon dioxide, and other gases that migrate through the ground and accumulate in buildings. While serious incidents are rare, mine gas is a recognised risk in certain areas and may require monitoring or ventilation measures.
4. Mine Water
As mines are abandoned, they fill with water. Rising mine water can cause:
- Flooding of basements and ground floors
- Ground instability as water saturates supporting pillars
- Contamination of groundwater
- Settlement as water levels change
The Coal Mining Search (CON29M)
A coal mining search is ordered as part of conveyancing for any property within the Coal Authority's defined coalfield area. It reveals:
| Information Provided | What It Means |
|---|---|
| Past underground mining | Depth and extent of historical workings beneath the property |
| Mine entries within influence | Recorded shafts or adits near the property |
| Coal mining subsidence claims | Whether claims have been made (and their outcome) |
| Mine gas reports | Known gas emission areas |
| Surface hazards | Opencast mining, spoil heaps, settlement |
| Future mining | Whether mining licences exist for the area |
| Coal mining ground stability | Whether the Coal Authority has assessed stability |
Which Areas Are Affected?
Major coalfield areas in the UK include:
- North East England: Northumberland, County Durham, Tyne and Wear
- Yorkshire: South and West Yorkshire (Barnsley, Wakefield, Doncaster)
- East Midlands: Nottinghamshire, Derbyshire, Leicestershire
- West Midlands: Parts of Staffordshire, Warwickshire
- North West: Lancashire, Greater Manchester, Cumbria
- South Wales: The Valleys (Rhondda, Merthyr, Swansea Valley)
- Scotland: Central belt (Fife, Lanarkshire, Ayrshire, Lothians)
- Kent: Small coalfield in East Kent
You can check whether a specific property is in a coalfield area using the Coal Authority's free interactive map at gov.uk/guidance/coal-mining-information.
Subsidence Claims and the Coal Authority
If your property suffers damage from coal mining subsidence, you may be able to claim against the Coal Authority under the Coal Mining Subsidence Act 1991. Key points:
- Claims cover damage to property and land caused by coal mining subsidence
- The Coal Authority assesses claims and arranges repairs (or provides compensation)
- There's no time limit on making a claim for subsidence from pre-nationalisation mining
- Claims don't go through your household insurance; they're made directly to the Coal Authority
Between 2010-2023, the Coal Authority received approximately 1,500-2,500 subsidence claims per year, paying out millions in compensation.
How Mining Risk Affects Property Value
The impact on property value depends on the specific risk:
- General coalfield area (no specific risk): Minimal impact on value
- Previous subsidence claim (resolved): 0-5% discount
- Mine entry within influence distance: 5-15% discount depending on proximity and treatment
- Active subsidence risk: 15-30% discount or unmortgageable
- Untreated shaft on property: Potentially unmortgageable until treated
Mortgage Lender Attitudes
Most lenders are comfortable lending in mining areas provided:
- The coal mining search doesn't reveal active risks
- Any previous subsidence has been resolved
- Mine entries are at a safe distance and have been treated/capped
- The property is structurally sound (confirmed by valuation/survey)
For properties with mine entries within 20 metres, some lenders require a Coal Authority stabilisation report or structural engineer's assessment before they'll lend.
What to Do If Mining Risk Is Identified
- Understand the specific risk. Is it historical workings at depth, a mine entry, or active ground movement?
- Check treatment status. Has the Coal Authority already stabilised the area or capped nearby shafts?
- Commission a structural survey. A Level 3 Building Survey with mining-specific expertise can assess whether the property has been affected
- Contact the Coal Authority. They provide free reports on specific properties and can advise on risk levels
- Check insurance availability. Standard household insurance covers mining subsidence in most cases (unlike other types of subsidence which may be excluded in high-risk areas)
- Negotiate the price. Documented mining risk is a legitimate reason to negotiate a lower purchase price
Living in a Mining Area: Practical Advice
If you already own or are buying in a former mining area:
- Monitor for signs of movement: cracks, sticking doors, uneven floors. Report promptly to the Coal Authority if you suspect mining-related damage.
- Be cautious with extensions. Building over or near mine workings requires careful foundation design. Always check before building.
- Maintain drainage. Leaking drains can exacerbate ground movement in mining-affected areas
- Keep records. Document any cracks or movement with photos and dates. This helps if you need to make a subsidence claim.
Check Mining Risk Before You Buy
A HouseCheckup report for £24.99 (Complete tier) identifies whether a property is in a Coal Authority coalfield area and flags associated mining risks: the same data that forms the basis of a formal Coal Mining Search (£40-55). Combined with flood risk, subsidence (from all causes), environmental data, and planning information, it's comprehensive property intelligence, human-checked and emailed to you. Don't wait 2-8 weeks for conveyancing searches to reveal mining issues. Check the fundamentals before you commit time and money.
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