Most cracks we are asked about in Prescot do not end in underpinning. A chartered structural engineer first finds out why the house has moved, and the usual answer is to remove that cause and then repair the masonry. Where the footings genuinely need to go deeper, we carry out the engineer’s design with Knowsley Council building control involved.
Which Prescot properties do we tend to hear about?
Prescot is one of the older towns in Knowsley, and its housing reflects that. The streets close to the town centre include older terraces, while the roads further out are lined with inter-war and post-war semis. Each group brings its own typical questions.
Older terraces near the centre
Terraced houses often sit on modest footings by modern standards, and they share walls with the neighbours on both sides. A crack at the back of one house may show up in the house next door too. When excavation is proposed near a shared wall, the Party Wall etc. Act 1996 usually needs to be considered, and a party wall surveyor deals with the notices. Our page on party walls and underpinning sets out how that fits around the work.
Inter-war and post-war semis
Here the calls are more often about a rear extension pulling away from the main house, or a garden tree that has grown much bigger than anyone expected. An extension on shallower footings can move differently from the original building, which opens a line of cracking at the junction. That is a job for diagnosis before anything else, and our extension subsidence repair page explains the usual routes.
What happens when you contact us from Prescot?
- A conversation first. We ring back and ask where the cracks are, roughly how wide, whether they are new or getting bigger, and whether doors or windows have started to stick.
- Background questions. We ask about the age of the house, nearby trees, the drains, any extension or bay, and whether an insurer, buyer or lender is already involved.
- A visit. We come out to look at the property with you.
- Investigation where the cause is unclear. We recommend a structural engineer’s inspection and, if needed, trial pits, soil tests, a CCTV drain survey or a period of monitoring.
- Options and a written quote. Once the engineer has a design, we explain it in plain English and price that scheme in writing.
If you think the cracking could be subsidence, speak to your buildings insurer before anything else. The insurer and its loss adjuster decide on investigation, monitoring and the repair method, including whether underpinning is needed at all.
Why underpinning is usually the last resort
The RICS consumer guide on subsidence says fewer than 5% of affected properties need underpinning. In practice, a leaking drain that has softened the ground under a footing can often be repaired, the soil left to settle, and the cracks then dealt with. Tree-related movement is handled with advice from an arboriculturist and the engineer, never by guesswork, and protected trees need council consent first. Our wider guide to underpinning across Liverpool and Merseyside covers when deeper foundations really are the right call.
When underpinning is the answer, the method depends on what the engineer finds below ground. Traditional bays of concrete suit shallower firm ground, while mini-piled underpinning takes the load further down where the upper soils are unreliable or access is tight.
Around Prescot
We also cover the neighbouring parts of Knowsley and beyond. Homeowners in Huyton will find a page on underpinning in Huyton, and the L35 district covering nearby Whiston and Rainhill sits between Prescot and St Helens, where the coal mining question also comes up. Further south, we work in Widnes too.
Cracks appearing in your Prescot home?
Note where they are, take dated photos, and give us a ring on 07777 659786. We will ask a few questions, explain what usually happens next and arrange a visit if it makes sense. You can also read more about local underpinning and subsidence repair before you call.
Frequently asked questions
Do older terraced houses in Prescot always need underpinning when they crack?
No. Older terraces often show some cracking from long-term settlement, minor movement or decayed lintels, and much of it is cosmetic. A structural engineer looks at the pattern, width and whether the cracks are growing before any repair is chosen. Underpinning is kept for cases where the cause cannot be removed.
Which council handles Building Control for underpinning in Prescot?
Prescot is in Knowsley, so Knowsley Council building control would normally be involved, unless a registered building control approver is used instead. The Planning Portal says underpinning an existing foundation will normally need approval under the building regulations, and we handle those notices as part of the job.
My neighbour in the terrace has cracks too. Does that change anything?
It can. Shared walls mean movement in one house often affects the next, and any excavation near a party wall usually needs the Party Wall etc. Act 1996 to be considered. A party wall surveyor handles the notices. If both homes are insured, each owner should speak to their own insurer.
How long before work could start on a Prescot house?
It depends on the property, the method and the permissions. Investigation and monitoring can take months, and Building Control and party wall matters may add time before anyone digs. Once a scheme is agreed, many underpinning jobs take a few weeks on site, while some methods take only days.
Is the extension crack on my semi a sign of subsidence?
Not necessarily. Extensions often sit on shallower or different foundations from the house, so a crack at the junction can come from differential movement rather than subsidence of the whole building. Only an engineer’s inspection can say which, and it may lead to a repair that is far smaller than underpinning.