Underpinning in St Helens follows the same rule as anywhere else: a chartered structural engineer identifies the cause of movement first, and deeper foundations are used only when that cause cannot be removed. The difference is that parts of the borough lie on the former Lancashire Coalfield, so it is sensible to check the coal mining position early. Most cracks still turn out to have a shallower explanation, such as drains, trees or an extension.
Anyone can search a postcode free using GOV.UK’s “Find out if a property is affected by coal mining” service, which shows whether a mining report is advised. Mining subsidence claims are a matter for the Mining Remediation Authority (formerly the Coal Authority, renamed on 28 November 2024). We do not handle those claims.
Mining legacy or something nearer the surface?
When someone in WA9, WA10 or WA11 rings about cracking, it is natural to wonder about old workings. Sometimes that question matters; often it does not. The table below shows how the two lines of enquiry differ.
| Question | Coal mining line | Shallow ground line |
|---|---|---|
| Who decides what happens? | The Mining Remediation Authority, for mining subsidence | Your buildings insurer, if you claim; otherwise you and the engineer |
| First check | The free GOV.UK postcode search | An engineer’s inspection of the crack pattern |
| Typical investigation | Mining report where advised | Trial pits, soil tests, drain CCTV survey, monitoring |
| Our role | None beyond pointing you to the right body | Visit, explain options and carry out the engineer’s scheme |
What housing do we see in St Helens?
The borough has a large stock of Victorian and Edwardian terraces alongside 20th-century semis. In the terraces, footings tend to be shallow by today’s standards and walls are shared, so the Party Wall etc. Act 1996 usually needs to be considered if digging is planned near a neighbour. In the semis, the familiar issues are rear extensions, bay fronts and gardens where a tree has outgrown its spot.
A crack that runs through the damp-proof course into the brickwork below ground, or one that is wider at the top than the bottom, is often linked to foundation movement. That is a reason to get advice, not a diagnosis. Our page on structural engineer surveys explains what the inspection covers.
How a St Helens job usually unfolds
We start by phoning you back. We want to know where the cracks are, whether they are new or widening, the age of the property, what is growing nearby, and whether an insurer, buyer or lender is already asking questions. Then we visit.
If the cause is not obvious, the engineer may want measurements over time. Seasonal clay movement and progressive movement can look alike on a single day, which is why crack and movement monitoring over around twelve months is sometimes recommended. If a leaking drain is suspected, a CCTV survey comes first, and our page on drainage-related subsidence explains why fixing the pipe often matters more than the foundation.
Only once the engineer has a design do we quote. Building Control at St Helens Borough Council, or a registered approver, inspects the work, and it is carried out in planned stages so the walls stay supported throughout. For a fuller picture of methods, see our overview of structural underpinning on Merseyside.
Neighbouring areas
We work across the borough boundary too. Prescot is just to the west in Knowsley, and Widnes lies to the south in Halton. Both have their own pages with the housing types we usually meet there.
Talk to us about cracking in St Helens
Run the coal mining postcode search, photograph the cracks with a date, then call 07777 659786. We will tell you honestly whether it sounds like a job for us, for your insurer or for the Mining Remediation Authority. More background is on our main page about underpinning specialists across Merseyside.
Frequently asked questions
Does living in St Helens mean my house is affected by coal mining?
Not automatically. Parts of St Helens lie on the former Lancashire Coalfield, but many properties are unaffected. The free GOV.UK coal mining search shows whether a mining report is advised for your postcode. If mining subsidence is suspected, the Mining Remediation Authority is the body to contact.
Will you deal with a mining subsidence claim for me?
No. Mining subsidence claims are handled by the Mining Remediation Authority, not by us. If your cracking turns out to have another cause, such as drains, trees or an extension, we can explain the options and carry out the repair designed by a chartered structural engineer.
Can a buyer’s survey in St Helens lead to underpinning?
A survey may flag cracking and recommend a structural engineer’s report. That report often concludes the movement is historic or minor and needs only repairs. Underpinning is recommended only when the engineer finds ongoing movement that cannot be dealt with by removing its cause.
What does a structural engineer look at on a St Helens terrace?
The engineer looks at where the cracks run, their width and shape, whether doors and windows bind, the condition of drains, nearby trees and the neighbouring houses. They may recommend trial pits or monitoring before deciding anything, because terraced footings and shared walls affect which repair will work.
Is underpinning noisy and disruptive?
There is excavation and concrete work, so expect some noise, mess and restricted access to the affected side of the house. Work is done in stages to the engineer’s sequence. Many families stay at home; if an insured property becomes uninhabitable, buildings insurance usually covers alternative accommodation.