Former mining areas
Old workings and house movement in Leeds
This page explains how shallow coal workings, infilled sites and old industrial land can affect homes in parts of Leeds. You will learn what records exist and how a specialist investigates whether past mining explains current movement.
Shallow workings under Leeds homes
Much of east and south Leeds was shaped by small-scale coal extraction long before deep mining began. These shallow bell pits and drift mines were often abandoned without proper backfilling. Over time, the voids can collapse or compress, especially when disturbed by new drainage, nearby construction, or changes in groundwater.
Houses built directly above these old workings may settle unevenly. Movement tends to be localised rather than widespread. The age of the property is not always a clue: some post-war homes were built over filled but unstable ground.
Infilled land and variable settlement
After pits closed, many sites were covered with demolition rubble, colliery waste or general fill. This material settles at different rates. Some fills contain organic matter that decays, or loose ash that compacts under load. Where the fill depth varies across a site, one part of a building may sink more than another.
Movement on infilled land often shows as diagonal cracks near corners, doors sticking on one side only, or sloping floors that worsen after heavy rain. Unlike clay-related subsidence, these issues may appear suddenly rather than gradually.
Records and specialist investigation
The Coal Authority holds maps of known mine entries and recorded workings. However, many early workings were never documented. A specialist may start with a desktop search of these records, then carry out a site inspection.
Further steps can include boreholes to sample the ground beneath the foundations, or geophysical surveys that detect hidden voids or layers of loose fill. Trial pits might be dug close to the house to expose foundation depth and soil conditions. These methods help distinguish mining-related movement from other causes like tree roots or leaking drains.
Signs of old workings or fill
Cracks and movement can look similar whether caused by mining, clay shrinkage or poor fill. Only investigation confirms the cause.
- Cracks near windows or doors
- Often linked to localised settlement from shallow voids or uneven fill. A survey would check foundation depth and ground consistency.
- One corner of the house sinking
- Typical of variable support where old workings or mixed fill lie under part of the building. Boreholes can reveal what is beneath.
- New cracks after nearby road works
- Vibration or changed drainage can disturb dormant voids. Records and a site inspection would show if old workings are present.
Typical costs for related work
Jobs vary widely because each site has unique ground conditions and history. Factors like access, property size, depth of investigation needed, and repair method all influence where a job falls within any range.
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Site investigation and report
£800 to £2,500
Depth of boreholes, number of test points and lab analysis required.
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Resin injection stabilisation
£3,000 to £12,000
Area treated, depth of injection and ground porosity.
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Screw piling for light structures
£5,000 to £18,000
Number of piles, depth to stable strata and access constraints.
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Traditional underpinning
£15,000 to £40,000 or more
Wall length, depth needed and disruption to occupants.
These ranges reflect typical costs for this type of work nationally. They are not quotes. Only a site inspection can determine what is needed for your home.
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