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Cracks, sticking doors and windows can be signs of building movement, but none proves subsidence on its own. The responsible route is to document what is changing, involve your buildings insurer if a claim may apply, and investigate the likely cause before deciding on repairs. Tree-related soil movement, leaking pipes, shrinkable clay and historic mining can all be involved, and each calls for different evidence and remedies.
Do cracks mean subsidence?
No single crack pattern or sticking door establishes subsidence. These can be warning signs, especially when a crack is new or widening or appears alongside other changes, but the cause needs to be assessed in context. The Royal Institution of Chartered Surveyors (RICS) says visible cracks in a particular area are often the first sign of a problem; its consumer guide is UK-wide and was published on 14 November 2022: RICS guidance on subsidence.
Note the crack’s position, direction, approximate width and when you first noticed it. Record related symptoms and whether they are changing. If the cause is unclear or movement appears to be progressing, seek advice from an appropriately experienced building surveyor or structural engineer rather than diagnosing it from appearance or proximity to a tree.
What can cause building movement?
Shrinkable soil and vegetation
Some clay soils shrink as their moisture content falls. Dry weather and water uptake by trees or bushes can contribute, but different clays shrink and swell at different rates. A nearby tree is not proof that it caused a crack. RICS reports a Which? estimate that about 70% of subsidence cases involve tree roots drawing moisture from shrinkable soil; the guide does not state the year of that estimate, and it is a secondary attribution rather than an independently verified current rate.
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- Whether you are a professional or a homeowner, this Monitoring Device is a must have tool for detecting wall deformations and cracks.
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Do not remove or prune a tree simply because it is close to a damaged building. RICS warns that removing a tree can occasionally make the problem worse; obtain expert advice on whether vegetation is involved and whether removal, pruning or the possibility of heave should be considered.
Leaking drains or water mains
Escaping water can soften soil or wash it away. The effect depends on ground conditions: RICS identifies this risk particularly in some sand, gravel or chalk soils. Roots can also enter a drain that is already damaged, so tree proximity may be a consequence or coincidence rather than the original cause. Where a leak is established, repairing the pipe may stabilise movement without underpinning.
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Historic mining
Old mine workings can collapse and cause ground movement. Records may not capture every very old local working, so if mining is plausible where you live, seek appropriate specialist advice and investigate the local history rather than treating the absence of a record as conclusive.
How to investigate cracks responsibly
1. Keep a dated record
Photograph each crack with a ruler or another scale in the frame. Record its location and direction, the date, and any changes you observe. Note other symptoms, such as doors or windows becoming difficult to operate. A consumer crack-monitoring gauge can help record change, but it cannot diagnose subsidence or replace monitoring arranged by an insurer or a specialist.
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2. Contact your buildings insurer if a claim may be involved
Tell the insurer about the suspected movement early and ask how it wants the investigation handled. RICS says insurers often appoint their own experts. Before commissioning substantial work independently, establish who will appoint or approve specialists, whether investigation and repair costs are covered, and what excess and policy conditions apply. Cover varies by policy.
3. Gather relevant history and records
Useful context may include the building’s age, alterations, previous surveys or reports, plans, available ground information, nearby trees and drains, and when the damage first appeared. The Department for Education’s staged-assessment guidance describes desk research using building records, historical surveys, maps and other public information before targeted assessment. It was published on 11 December 2025 and applies to education estates in England—not residential properties—so it is a process example, not a homeowner regulation: Department for Education guidance on structural assessments and investigations.
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4. Agree a clear professional scope
Ask a surveyor or engineer with relevant experience in subsidence and existing buildings to explain the questions the investigation will answer, its scope and exclusions, proposed methods, outputs, timing and fees. The Department for Education guidance sets out a staged process: agree scope and fees, review records, inspect visually, undertake sampling or testing if needed, interpret the findings and recommend next steps. Intrusive testing should be justified by the evidence and the questions that remain. For a listed or historic building, seek appropriate conservation expertise.
5. Use targeted tests, then interpret the findings
Depending on the suspected mechanism, an investigation may examine foundations, soil, drainage, tree roots or seasonal movement. These checks should address specific uncertainties rather than be ordered as a fixed package. Local authorities’ evidence requirements for tree-damage claims illustrate that crack and level monitoring, foundation details, soil tests, drainage evidence and arboricultural evidence may all matter in particular cases, but requirements vary by council and situation. Examples include Cheshire East Council’s guidance on claims for damage caused by a council tree, Kirklees Council’s guidance on trees and damage and St Albans City and District Council’s guidance on tree-related building subsidence.
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- Precision Gauge Design: Consists of two overlapping plates, with a calibrated bottom plate in millimeters and a transparent top plate marked with a crosshair cursor for accurate crack measurement
- Complete Kit: Includes full instructions, Crack Record Sheet, and all necessary fixings using screws and adhesive, ensuring easy installation and use
- High Accuracy: ±1 mm (±0.04") tick marks on X-Y axes with ±0.5 mm (±0.02") discrimination for precise measurements
- Wide Measurement Range: Measures horizontal movements up to ±20 mm (±0.79") and vertical movements up to ±10 mm (±0.38")
- Redesigned Fixing Column: Easily secures the two plates without glue. High-quality polymer construction with an easy-to-read measurement grid for reliable wall crack monitoring
Before agreeing to repairs, ask the professional to explain the likely mechanism, what the evidence establishes, what remains uncertain and why the recommended next step is proportionate. RICS says crack measurement and monitoring may be needed for up to 12 months, or longer in extreme cases; that is a possible investigation period, not a standard requirement for every property. A full investigation and rectification process can take up to two years, also a possible duration rather than a guaranteed timetable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should the cause shape the repair?
Repair the underlying cause where it can be established; do not choose a structural remedy simply because cracks are visible. In particular, underpinning is not the default response to suspected subsidence.
- If a leak is found: repairing the pipe may be enough to stabilise movement. Kirklees Council says drain repair is usually preferable to felling a tree where roots have entered an already damaged drain.
- If vegetation is implicated: seek advice before changing or removing it, because tree removal can occasionally worsen the problem.
- If underpinning is proposed: ask what evidence shows that it is necessary and whether less intrusive remedies could address the mechanism. RICS’s 2022 guide estimates that fewer than 5% of properties suffering subsidence need underpinning and attributes the last-resort recommendation to the Institution of Structural Engineers. This is a published estimate, not a prediction for an individual home.
Do not excavate foundations, alter structural elements, remove trees or carry out invasive investigations yourself. The Health and Safety Executive’s guidance concerns structural stability during alteration, demolition and dismantling; it says a competent person should assess a structure before potentially load-bearing parts are changed. It is not a general homeowner subsidence standard, but it underscores the risks of unplanned structural work: HSE guidance on structural stability during alteration, demolition and dismantling.
Choosing a professional
Compare relevant experience and the proposed work, not just the job title. Before appointing anyone, check:
- Experience with subsidence and existing buildings; for a listed or historic property, conservation expertise.
- The investigation questions, methods, scope, exclusions and whether intrusive testing is justified by initial findings.
- Whether your insurer will appoint or approve the expert and who will coordinate the work.
- What you will receive, when you will receive it, and how findings and uncertainty will be explained.
- Fees and appropriate professional insurance.
Responsibility for appointments, investigation costs and repairs depends on your policy and circumstances, so settle those points with the insurer before authorising substantial work.
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