Advice and guides
Understanding ground movement in Kent homes
Read the guides below to work out what a crack or sticking door might mean for your home. When you are ready, send an enquiry at no cost and without any obligation to proceed.
Why the ground under Kent matters so much
Kent sits on several different types of soil and rock, sometimes within the same street. Weald Clay shrinks when it dries and swells when it gets wet, moving the foundations above it. Chalk can dissolve over time, leaving voids that eventually collapse. Greensand is softer and shifts more easily under weight.
A house built on clay behaves differently from one built on chalk, even if they look identical from the pavement. The guides on this site explain each type of ground and what it does to the buildings sitting on it. Reading about the specific geology beneath a home helps make sense of why a crack appeared in one wall but not another.
Knowing the ground type also shapes what a specialist will recommend. A fix that works on firm chalk may fail completely on shrinking clay. The page on Kent's geology breaks down where each soil type is found and what problems tend to follow.
Reading the signs in walls and floors
Cracks do not all mean the same thing. A thin line running through plaster above a window frame often comes from normal drying out. A wider gap that steps diagonally across brickwork usually points to something moving underneath the footing.
The difference matters because it determines whether a home needs monitoring or immediate repair. Specialist firms use trial pits, boreholes and root samples to find out exactly what is happening below ground level before recommending a course of action. Guessing from the surface alone leads to wasted money.
Doors that stick, floors that slope and gaps that open around skirting boards all tell part of the story. None of them confirms subsidence on its own. A structural survey looks at the pattern of damage together with the soil conditions to reach a conclusion. The guides here explain what each sign typically indicates so a homeowner knows when to take it seriously.
How specialist firms stabilise a home
Once the cause of movement is identified, the specialist firm decides on a method. Underpinning deepens the existing foundations so they rest on firmer ground. It involves digging sections beneath the walls and filling them with concrete in a set sequence.
Resin injection works differently. A specialist pumps expanding resin into weak or washed-out soil, compacting it from within without excavating large trenches. This suits situations where the ground has lost density rather than where the foundations themselves are too shallow.
Screw piles offer another route, particularly for bays, porches and extensions where traditional underpinning would be disruptive. Steel shafts are driven deep into stable ground to carry the load independently of the topsoil. Each method suits different problems, and the choice depends entirely on what the investigation reveals. The individual pages on this site walk through how each technique works and when a specialist is likely to suggest it.
What happens after an enquiry is sent
Sending an enquiry passes the details to a specialist firm operating in that part of Kent. They review the description of the problem and arrange a visit to inspect the home. That initial assessment establishes whether the movement is ongoing or happened years ago and stopped.
If further investigation is needed, the specialist organises soil tests or drainage checks. Everything proceeds step by step. No work starts until the cause is confirmed and a plan is agreed. Homeowners receive a clear explanation of what the specialist proposes and why.
Insurance companies often require this evidence before approving a claim. The reports produced during the investigation serve that purpose as well as guiding the physical repair. Understanding this process removes some of the worry that comes with noticing damage. The guide on what happens from the first enquiry sets out each stage plainly.
What different signs around a home suggest
The same visible damage can stem from entirely different causes underground. Soil type, drainage and nearby trees all change what a crack actually means for a specific home.
- Diagonal cracks stepping through brickwork
- Often points to foundation movement caused by clay shrinkage or washout. Trial pits and soil tests confirm the exact reason.
- Doors and windows jamming in their frames
- A reading like this often points to uneven settlement or seasonal timber swelling. Monitoring the movement over several months usually separates the two causes and shows whether a specialist needs to look closer.
- Gaps opening between skirting boards and floors
- Suggests the floor slab is dropping away from the walls. A specialist inspection identifies whether the ground beneath has weakened.
- New cracks appearing after a dry summer
- Frequently linked to clay soils shrinking as moisture leaves. Borehole samples show if the subsoil is reactive enough to cause this.
Typical costs for ground movement repairs
Repair costs vary widely because every home sits on different ground and suffers different levels of damage. Access, depth of foundations and the chosen method all shift the final figure significantly.
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Resin injection for minor settlement
£1,500 - £4,000
Volume of resin needed and how accessible the affected ground is around the footprint.
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Concrete floor slab repair
£2,000 - £6,500
Size of the area, depth of the new pour and whether drainage requires attention.
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Screw piling for an extension base
£3,500 - £8,000
Number of piles required and how far they must be driven to reach stable strata.
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Traditional underpinning per metre
£1,200 - £3,600
Depth to firm ground, access for excavation and the condition of the existing footing.
These figures indicate typical costs for this kind of work. Nothing here is a quotation. Only a physical inspection settles a price for a specific home.
Ask for advice about your home
Send the details of what you have noticed. A specialist firm covering your area reviews the information and contacts you directly. There is no charge for this and no commitment to accept any subsequent proposal.
- No obligation to proceed
- No fee for the enquiry
- Local specialists respond