Coal Mining Search in South Yorkshire: Do You Need One?

South Yorkshire sits on one of the largest and most extensively mined coalfields in England. For centuries, coal extraction shaped the region's landscape, economy, and communities. Although the last deep mines closed decades ago, their legacy remains underground — and it has a direct bearing on how properties in the area are bought and sold.

If you are selling a property in South Yorkshire, there is a very high chance your buyer's solicitor will request a CON29M coal mining search as part of the conveyancing process. This guide explains the scope of the coalfield, which areas are affected, what the search covers, and what the results mean for your sale.

The South Yorkshire coalfield — scope and history

The South Yorkshire coalfield is part of the broader Yorkshire-Nottinghamshire coal measures, which form the largest continuous coalfield in England. The coalfield stretches from Halifax in the northwest to Doncaster in the east, taking in a vast swathe of industrial and residential land across multiple metropolitan boroughs.

At its peak in the mid-twentieth century, the coalfield supported dozens of working collieries. By 1984, the National Coal Board operated approximately 15 collieries in Wakefield, 11 in Rotherham, 10 in Barnsley, and 9 in Doncaster. Many more had already closed by that date, and the decline continued through the 1990s and 2000s until the last deep mines in the region ceased production.

The legacy of this intensive extraction is a complex network of underground tunnels, shafts, and voids beneath thousands of residential properties. While most are at sufficient depth to pose no immediate risk, the potential for ground movement, subsidence, and mine gas means that any property transaction in the area must account for this history.

The coalfield also extends into West Yorkshire's eastern fringe, covering towns such as Castleford, Pontefract, Normanton, Featherstone, South Elmsall, and South Kirkby. Sellers in these areas face the same requirements as those in South Yorkshire proper.

Which areas require a CON29M search?

A CON29M coal mining search is required whenever the property being sold falls within a coal mining reporting area as defined by the Mining Remediation Authority (MRA), formerly the Coal Authority. Within South Yorkshire and the surrounding coalfield, the following areas are almost entirely within the reporting zone:

It is critical to understand that reporting area boundaries do not follow neat administrative lines. A property on one side of a street may be within the reporting area while its neighbour is not. The only way to confirm whether your property requires a CON29M search is to check the specific postcode using the MRA's interactive map.

For a broader overview of which areas across the whole of England and Wales are affected, see our guide to coal mining search areas in the UK.

What the CON29M mining search covers

The CON29M is a Law Society standard form that provides a comprehensive report on coal mining activity affecting a property. It is produced by the Mining Remediation Authority using their extensive database of mine records. The search covers the following areas:

Mine entries (shafts and adits)

The MRA maintains records of over 170,000 mine entries across England, Scotland, and Wales. The search reveals whether any recorded mine shafts or adits (horizontal tunnels) exist within 20 metres of the property boundary. In South Yorkshire, where collieries were densely concentrated, mine entries are more common than in many other coalfield regions.

Past and present mining

The report details whether coal was extracted from seams beneath or near the property. It records the depth of the shallowest known workings, the dates of extraction, and whether mining took place within the zone of influence. Mining at depths of less than 30 metres is considered higher risk for surface subsidence.

Subsidence claims

The search reveals whether any claims for coal mining subsidence damage have been lodged against the property under the Coal Mining Subsidence Act 1991. A resolved claim with documented remediation can actually help reassure buyers that any damage has been formally addressed by the responsible authority.

Mine gas emissions

Abandoned coal mines can release gases — primarily methane and carbon dioxide — through natural pathways to the surface. The CON29M records whether the MRA holds any data on mine gas emissions in the vicinity of the property. In areas with shallow workings, this can be a material concern for both the property and its occupants.

Standing advice and remediation notices

The report will flag whether the property is subject to any standing advice from the MRA — for example, development constraints related to ground stability — or whether any remediation notices have been issued requiring work to make mine entries or unstable ground safe.

How to check if your property is in the reporting area

The Mining Remediation Authority (formerly the Coal Authority) publishes a free interactive map viewer at datamine-cauk.hub.arcgis.com. This is the definitive tool for checking whether any property in England, Scotland, or Wales falls within a coal mining reporting area.

To use the map:

1. Visit the MRA's interactive map viewer at datamine-cauk.hub.arcgis.com
2. Enter your property's postcode or full address in the search bar
3. The map will show whether the location falls within a reporting area (shaded in colour) or outside it
4. You can also view the approximate locations of recorded mine entries and other mining features

If the map confirms your property is within the reporting area, a CON29M search will be needed when you sell. Your conveyancer will also verify this independently, but checking in advance means you can plan accordingly and avoid surprises.

What happens if the search reveals issues

In a region with as much mining history as South Yorkshire, it is extremely common for the CON29M to return positive findings — evidence of past mining, recorded shafts, or historical subsidence claims. This does not mean your property cannot be sold. Thousands of transactions complete successfully every year in former coalfield areas.

The key question is the nature and severity of what the search reveals:

Past mining at depth with no subsidence

This is the most common result in South Yorkshire. If coal was extracted at sufficient depth (typically more than 30 metres) and there are no recorded subsidence claims or mine entries nearby, the buyer's solicitor will usually be satisfied. The buyer may take out standard mining indemnity insurance as a precaution, but the sale should proceed without difficulty.

Recorded subsidence history

If the search shows a previous subsidence claim, the buyer's solicitor will want to understand whether the damage was repaired and signed off. Properties where subsidence was remediated under a Coal Authority claim often have good documentation, which can be reassuring. For detailed guidance, see our article on selling a property with subsidence.

Recorded mineshaft within or near the property

This is the most challenging finding. A mineshaft within the property's boundary is a serious concern for buyers and lenders. Around 95% of mortgage lenders will decline to lend on properties with a recorded mineshaft within the boundary. If the shaft is nearby but not within the boundary, the position is more nuanced — the buyer may require evidence that it has been capped and made safe.

For advice on selling in this situation, see our guide to selling a house with mining subsidence.

Mining subsidence and property values — the impact on your sale

Mining history has a measurable effect on property values in South Yorkshire, though the degree of impact depends on the specifics of each case.

It is worth noting that in established mining areas like Barnsley, Doncaster, and Rotherham, the general presence of mining history is already factored into property prices. Buyers purchasing in these areas expect a mining search and understand the context. The impact on your sale is greatest when a specific, significant issue is found — such as a nearby mineshaft or unresolved subsidence — rather than the mere fact that mining once took place in the area.

Insurance complications in former mining areas

Properties in former mining areas can face insurance challenges. Some providers exclude subsidence cover entirely for properties in coalfield regions, while others charge higher premiums to reflect the perceived risk. This is particularly true if the CON29M reveals shallow workings or a previous subsidence claim.

Key points for sellers to be aware of:

• Disclosure is essential. You must declare your property's mining history to your insurer. Failing to do so could void your policy.
• Specialist brokers can help. Brokers who specialise in coalfield properties can often find competitive cover from insurers who understand the actual risk profile of the area.
• Buyers will check. The buyer's mortgage lender will require buildings insurance as a condition of the loan. If the buyer struggles to obtain cover due to mining history, it could delay or jeopardise the sale.
• Remediated subsidence is easier to insure. If your property had subsidence that was repaired under a Coal Authority claim, insurers generally view this more favourably than properties with suspected but uninvestigated issues.

How long does a coal mining search take and what does it cost?

The CON29M is one of the fastest and most affordable searches in the conveyancing process:

As a seller, you can order the CON29M upfront before listing your property. This means the result is ready when the buyer's solicitor needs it, removing a potential delay from the post-offer process. For a full breakdown of all property search costs, see our guide to how much property searches cost.

Central Leeds and Bradford — generally outside the zone

Sellers in West Yorkshire sometimes assume that because South Yorkshire is so heavily affected, all of West Yorkshire must be too. This is not the case. Central Leeds and Bradford are generally outside the coal mining reporting area. The northern and western suburbs of Leeds, and most of Bradford, were not part of the historic coalfield.

However, the eastern fringe of West Yorkshire — where it borders the South Yorkshire coalfield — is a different story. The following areas are within the reporting zone and do require a CON29M search:

• Castleford and Pontefract — Former colliery towns in the Wakefield district
• Normanton and Featherstone — On the edge of the coalfield south-east of Leeds
• South Elmsall and South Kirkby — Deep into the reporting area near the Barnsley border
• Selby district (parts) — The former Selby coalfield operated until 2004

If you are selling in West Yorkshire and are unsure whether your property is affected, check the MRA's interactive map or ask your conveyancer to confirm. The distinction between "in" and "out" of the reporting area can come down to a few hundred metres in fringe locations.

Sellers in Sheffield may also want to connect with a local estate agent in Sheffield who understands how mining history affects the property market in different parts of the city.

Sources and further reading

• Mining Remediation Authority (formerly Coal Authority) — Interactive map of coal mining reporting areas and CON29M search service: datamine-cauk.hub.arcgis.com
• GOV.UK — Coal Authority guidance for property buyers and sellers: gov.uk/government/organisations/the-coal-authority
• Coal Mining Subsidence Act 1991 — Legislation governing responsibility for coal mining subsidence damage: legislation.gov.uk
• SAM Conveyancing — CON29M coal mining search guidance and provider comparison: samconveyancing.co.uk
• Safe-Move — CON29M data and coal mining search information: safe-move.co.uk
• British Geological Survey — Geological hazard data and ground stability information for Yorkshire: bgs.ac.uk

Related guides

• Coal Mining Search in Durham and Northumberland
• Selling an Ex-Council House in Sheffield

Frequently asked questions