Greater Manchester · M1–M46
Coal Authority searches, glacial till and 1930s clay-belt semis, read by accredited specialists who know the city.
Manchester is two subsidence stories layered on top of each other: shallow historic coal workings across the eastern and northern boroughs, and a shrinkable clay belt running through the leafy south. Cracking diagnosed honestly here usually starts with the CON29M coal search, the local drainage age and the tree line, not with a contractor's repair quote.
Accredited
RICS and IStructE-accredited subsidence specialists
Independent
We don't sell or carry out repairs, diagnosis only
Evidence-led
Reports built on what's actually on site, not what's easiest to sell
UK-wide
Subsidence specialists covering England, Wales and Scotland
Local diagnosis · the four things that matter in M-postcodes
Shallow bell-pits and recorded seams beneath swathes of east and north Manchester, Oldham, Tameside, Wigan, Bury, Salford. A CON29M coal search and a Coal Authority records review are the first move on any cracking case in these postcodes.
A stiff but variable clay-and-cobble blanket left by the last ice sheet, sitting on Coal Measures sandstones and mudstones. The variability, not the average, is what catches shallow Victorian foundations out.
Didsbury, Chorlton, Heaton Moor, Sale, Altrincham, mature lime, sycamore, oak and beech sitting on shrinkable clay pockets. Cracking spikes after dry summers in the 1930s semi-detached stock here.
Across the inner-ring byelaw terraces, original salt-glaze lateral drains are now well past design life. Long-running leaks wash out fines beneath the front bay or rear addition, read as 'subsidence' but solved as a drains job.
Two distinct subsidence patterns
Tameside, Oldham, Rochdale, Bury, parts of Salford and Wigan, and the eastern fringes of the city itself sit over recorded shallow coal workings. Cracking here is rarely catastrophic but it can be sudden, a void migrating upward decades after extraction stopped. Diagnosis starts with the Coal Authority Interactive Viewer, the formal CON29M coal mining search, and any historic mine entry records within the influencing distance of the plot. Many enquiries are resolved by demonstrating that no shallow workings sit under the property and the cause is something else entirely.
Didsbury, Chorlton, Heaton Moor, Sale, Altrincham, Stockport, wide tree-lined streets, leafy verges, and a heavy concentration of 1930s semi-detached housing with shallow strip foundations. Where the glacial till is locally clay-rich, mature trees within a tree-height of the house can drive seasonal foundation movement. Cracking complaints spike in late summer following dry springs, and many cases that look "tree-driven" on first inspection turn out to be drainage-led on closer reading, a distinction that matters because the remedies are very different.
Coverage
Specialist firms in our network routinely take enquiries from across all ten Greater Manchester boroughs, Cheshire East and West, and the Trafford and M60 ring. If your postcode isn't listed, send the photo enquiry anyway, a qualified specialist covering your area will pick it up.
Speak to a specialistRepresentative Manchester case
Illustrative summary of the type of enquiry commonly seen in Manchester, not a specific client case.
A 1930s semi-detached in south Manchester develops stepped cracking around the front bay window during a dry summer. The homeowner suspects historic mining and is bracing for an underpinning quote. A review of the Coal Authority data and CON29M shows no shallow workings beneath the plot. The actual cause, identified on inspection, is clay shrinkage exacerbated by a long-running leak in the shared lateral drain at the front boundary, a far less expensive remedy than the underpinning a repair contractor had floated at the door. The written report goes to the insurer with a BRE damage classification, a clear cause statement, and a proportionate next step.
That sequence, coal-search review first, then drainage, then trees, then a written diagnosis, is the routine shape of a Manchester subsidence case handled properly.
Independent specialists
RICS or IStructE-accredited subsidence specialists giving an evidence-led diagnosis and a written report you can hand to an insurer, lender or solicitor. No tied repair business, no commission on the outcome.
Speak to a specialistPhoto opinion
A qualified subsidence specialist covering Greater Manchester will review your photos personally and tell you honestly whether a paid inspection is warranted.
Manchester is one of many regions our accredited specialists cover. Each location page sets out the typical local subsidence triggers, clay, trees, drains, mining, washout, and what that means for the survey approach in your area.
London Clay
ReadMercia Mudstone and made ground
ReadCoal Measures and clay
ReadMercia Mudstone clay
ReadCoal Measures shale and clay
ReadSandstone with clay pockets and made ground
ReadSherwood Sandstone with Mercia Mudstone fringe
ReadLondon Clay and Reading Beds
ReadGault Clay
ReadOxford Clay
ReadChalk with clay-with-flints capping
ReadLondon Clay and Bracklesham Beds
ReadMercia Mudstone and alluvium
ReadBoulder clay over igneous bedrock
ReadGlacial till with historic coal workings
ReadGlacial till and Coal Measures
ReadOxford Clay
ReadChalk with crag deposits
ReadAlluvium and lacustrine clay
ReadMercia Mudstone clay
ReadMercia Mudstone with made ground
ReadSlate and shale with clay pockets
ReadMade ground and London Clay
ReadLondon Clay and crag
ReadMercia Mudstone clay
ReadLondon Clay and Gault Clay
ReadLondon Clay
ReadOxford Clay and Kimmeridge Clay
ReadBracklesham Beds, sand and clay
Read