Mortgage Tree Report: When Lenders Ask for an Arborist

If your lender or insurer has suddenly asked for a "mortgage tree report," it can feel like one more unexpected hurdle in an already stressful process. This request often comes at a critical time, adding pressure when you’re keen to finalise your mortgage or insurance. The good news is that with a clear understanding of what the report involves and the right professional arborist on your side, navigating this requirement is usually straightforward.

Knowing what the lender is looking for, why they ask for it, and how an arborist assesses the trees can help you respond quickly and confidently, avoiding delays and ensuring your property remains protected.

What people mean by a mortgage tree report

There is no official product called a "mortgage tree report". It is simply a tree survey or arboricultural report written in a way that answers the lender or insurer's specific concerns about trees and building movement.

Typically, a professional arborist is asked to assess trees close to a house, extension or outbuilding, then provide an independent view on current risk and sensible management options. The report is then shared with your lender, insurer, broker and solicitor.

Reasons lenders and insurers ask for a tree report

Requests usually arise after a surveyor has flagged possible risk factors. These do not mean there is definite damage, only that the lender wants a specialist opinion before lending against the property.

• Subsidence history: Previous or ongoing movement recorded in surveys or insurance records.

• Nearby mature trees: Large trees or groups close to foundations, especially on shrinkable clay soils.

• Visible cracking: Cracks in walls, ceilings or paving that may or may not be tree related.

• Previous insurance claims: Past subsidence or heave claims, particularly if trees were mentioned.

• High water demand species: Certain species, such as willow or poplar, noted near the property.

In many cases, the lender is simply seeking reassurance that trees are being responsibly managed and that any clear risks are understood and addressed.

What a professional arborist report typically includes

A mortgage tree report focuses on both tree health and how each tree interacts with nearby structures. A qualified arborist will usually:

Identify and describe each tree

The report will list relevant trees by species, approximate age class, height and crown spread. Photos and a plan or sketch may be included to show location and numbering.

Measure size and proximity to buildings and drains

The arborist will record distances to the house, extension, garages, boundary walls and visible drains. Tree size, potential ultimate size and soil type are considered when assessing potential influence on foundations.

Assess condition and structural safety

Trees are examined for defects such as decay, poor branch unions or deadwood that could create a safety hazard. General vigour, past pruning and signs of root activity may also be noted.

Evaluate subsidence and structural risk

The arborist will look for surface signs of movement, such as stepped cracking, distorted doors or uneven hard surfaces. They then relate these observations to tree species, soil conditions and historic information, explaining whether trees are a credible contributing factor.

Provide clear management recommendations

The report should set out practical recommendations, such as staged crown reduction, root pruning in specific situations, ongoing monitoring or, in some cases, removal. It will usually explain the reasoning so that lenders and insurers can see a logical, evidence based approach.

What to do next: a simple flowchart in words

When a mortgage tree report is requested, time is often tight. The steps below can help keep the process organised and reduce delays.

1. Speak to your broker and solicitor

Ask them to share the exact wording of the lender or insurer's request. Sometimes they only need an update on specific trees, not a full site survey. Clarifying this early can save both time and money.

2. Gather relevant paperwork and survey notes

Collect the homebuyer's report, full building survey, previous insurance correspondence and any old tree reports. Provide these to your arborist so they can understand the background and address all the lender's points in one go.

3. Book a site visit with a qualified arborist

Arrange an inspection as soon as possible, making sure the arborist knows it is for a mortgage or insurance case. Confirm who the report needs to be addressed to, any deadlines and whether electronic copies will suffice.

4. Submit the report and follow up

Once you receive the report, forward it to your broker, solicitor and, if asked, the insurer. They may respond with conditions, such as carrying out recommended works or reviewing again in a set period. Keep written records of any agreements and dates.

What a mortgage tree report cannot do?

It is important to understand the limits of any arboricultural assessment. Trees and soils are living, changing systems, and no report can offer absolute guarantees.

A tree report cannot guarantee there will be no future movement to a building. Instead, it provides an informed, professional opinion based on the condition of the trees and evidence available on the day of inspection.

Similarly, an arborist cannot definitively prove that a particular crack is or is not caused by a tree without long-term monitoring or engineering data. In many real situations, the report will explain a range of possible contributors and outline proportionate management options.

Planning controls, TPOs and conservation areas

If the report recommends pruning or removing a tree, planning controls may apply. Some trees are protected by a Tree Preservation Order (TPO), and most trees in a conservation area have automatic protection subject to size thresholds.

Your arborist should highlight any obvious protection and advise whether a planning application or notification to the local council is needed before work. Carrying out unauthorised work to protected trees can lead to fines, so it is important to check before anything is done.

In many cases, well-planned, modest pruning proposals that address subsidence concerns and retain amenity value are acceptable to local authorities. An experienced arborist can prepare supporting information to accompany an application if needed.