Subsidence Reports
Clear, defensible assessments for tree-related structural movement — built for insurers, engineers and homeowners who need stable, evidence-based decisions.
Small cracks create big questions. Insurers request evidence, engineers need clarity, and uncertainty slows everything. A focused subsidence assessment identifies what’s happening and how to proceed without unnecessary cost.
When movement appears, you need certainty early…
Subsidence ties together soils, foundations and nearby trees.
It feels complex when viewed in isolation.
A structured assessment sets out the facts, reduces assumptions and helps you act with confidence.
What is a Subsidence Report?
A Subsidence Report evaluates whether nearby trees are influencing structural movement by assessing:
- crack patterns and structural symptoms
- moisture behaviour in shrink–swell soils
- root pathways and likelihood of root presence
- species-specific water demand
- proximity, foundation depth and loading context
- seasonal patterns of movement
The outcome is a clear conclusion: tree involvement confirmed, possible, or unlikely.
Reports are structured for acceptance by insurers, planners and engineers.
Do I need a Subsidence Report?
You may need one if you’ve noticed:
- diagonal or stepped cracking
- gaps forming at junctions or extensions
- movement that worsens in dry months
- mature trees positioned close to foundations
- driveways or patios repeatedly lifting or dipping
- queries raised by insurers, surveyors or planners
A subsidence report provides the evidence required to make safe, proportionate decisions.
Why this matters for planning:
Trees sit within planning legislation as a material consideration.
When structural movement occurs near vegetation, LPAs require reliable evidence to determine:
- whether a tree poses a genuine risk
- whether removal or retention is justified
- whether designs need adjustment
- whether conditions should be applied
Without clear information, planners may pause validation, request additional reports or require updated designs.
What your Subsidence Report includes
A clear, defensible assessment covering:
- crack pattern interpretation
- structural and site context
- species identification and moisture demand
- proximity and likely root pathways
- local soil behaviour and shrink–swell risk
- root presence indicators (where observable)
- whether tree influence is likely, possible or unlikely
- proportionate mitigation or monitoring options
Where these occur, planning applications without evidence frequently receive validation queries, requests for additional surveys or time-sensitive conditions.
Our Approach
Evidence Focused
Diagnosis grounded in structural, soil and arboricultural data.
Measured Recommendations
Actions aligned to risk, not assumption.
Planning Compatible
Evidence presented clearly for planning decisions.
The Subsidence Assessment Process
| Step | Description |
|---|---|
| 1. Initial Review | Send photographs, site details and any existing reports. |
| 2. Site Visit | Assessment of trees, soil indicators, foundations and cracking. |
| 3. Diagnosis | Tree involvement confirmed, possible or unlikely. |
| 4. Recommendations | Balanced options matched to risk level. |
| 5. Reporting | A clear, defensible report suitable for planning, insurance or engineering decisions. |
Your Next Step
Need a Subsidence Report? Share your site details and we’ll confirm the level of assessment required.
Phone: 0800 494 7479
Email: [email protected]
Areas We Cover
We cover many areas across England and Wales. Click below to find out more.
Case Note
A mature beech stood roughly 5 metres away, and the insurer queried potential tree involvement.
Crack patterns were inconsistent with moisture-driven movement, and soil indicators pointed toward a drainage issue.
Root influence was assessed as low-likelihood. Repairs focused on drainage correction, the tree was retained, and the homeowner avoided unnecessary structural works.
Subsidence Survey FAQs
What is a tree subsidence report?
A tree subsidence report is a detailed, planning and insurance ready document that assesses whether trees are influencing soil movement and contributing to structural damage. It combines arboricultural evidence with site conditions to establish causation, risk, and appropriate management recommendations.
What causes subsidence related to trees?
Tree related subsidence is most commonly caused by moisture extraction from shrinkable clay soils. As trees draw water from the ground, the soil can contract, leading to downward movement that affects foundations, particularly in dry periods.
How can I tell if a tree is causing subsidence?
Typical indicators include cracking to walls, sticking doors or windows, and uneven floors. However, confirming whether a tree is the cause requires professional investigation, including soil type, proximity, species, and seasonal movement patterns.
Do I need a tree subsidence report for an insurance claim?
Yes, in many cases insurers will require a professional arboricultural assessment to support or dispute a subsidence claim. A robust report provides evidence on whether vegetation is a contributing factor and informs appropriate mitigation.
Can subsidence caused by trees be fixed?
Yes, but the solution depends on the cause and severity. Options may include tree management such as pruning or removal, combined with structural repairs. A tree subsidence report ensures that any action taken is proportionate and evidence based.
Will removing a tree stop subsidence?
Not always. In some cases, removing a tree can lead to soil rehydration and ground heave, which can also damage structures. A professional report assesses both subsidence and heave risk before recommending any works.
Which tree species are most likely to cause subsidence?
High water demand species such as willow, poplar, oak, and plane are more commonly associated with subsidence, particularly when located close to buildings on clay soils. However, risk is site specific and must be assessed holistically.
Do I need council permission to remove a tree causing subsidence?
If a tree is protected by a Tree Preservation Order or located within a conservation area, you will need consent from your Local Planning Authority before carrying out works. You can check with your local council here:
https://www.gov.uk/guidance/tree-preservation-orders-and-trees-in-conservation-areas
A subsidence report can support your application by providing clear technical justification.
Who carries out a tree subsidence report?
Tree subsidence reports should be prepared by qualified arboricultural consultants with experience in structural damage investigations. This ensures the findings are credible for planning, insurance, and legal purposes.
How long does a tree subsidence assessment take?
A site visit is typically completed within a few hours, depending on site complexity. The full report is usually issued within a few days, allowing for detailed analysis, evidence review, and professional recommendations.
Can I buy or sell a property affected by tree subsidence?
Yes, but subsidence can affect property value and mortgageability. A clear, professional report helps demonstrate the cause, extent, and resolution strategy, which is often required by lenders and surveyors.
What information is included in a tree subsidence report?
A typical report includes:
- Site inspection findings
- Tree identification and influence assessment
- Soil and geological context
- Damage analysis
- Risk evaluation
- Evidence based recommendations
This ensures the report is suitable for planning, insurance, and legal use.
