Subsidence, settlement and heave
What should you ask if a large tree stands on clay near a cracked wall?
Ask whether the surveyor thinks the tree, the clay and the crack belong in the same sentence, and what they would need to investigate that. A tree near a house is not proof of subsidence. A crack near a tree is not proof the tree is the cause. Clay soils change volume with moisture, which is why the combination is taken seriously.
Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.
What is the fuller explanation?
The ABI explains subsidence as downward movement of the ground, and trees are a well-known influence on clay because they draw water. A home survey does not include a soil test or a root identification unless you agreed one. The surveyor can record the species if they know it, the distance in broad terms, and the crack. They cannot say how the soil will behave next summer.
Further investigation might be an arboriculturist, a drain test, or an engineer. Felling is not the default, and on clay it can be followed by heave. Conservation areas and tree preservation orders are legal controls the survey does not administer. Ask your solicitor before anyone talks about cutting the tree down.
What should you ask your surveyor?
- Do you believe this crack and this tree are linked, or is that only possible?
- What soil evidence do you actually have, if any?
- What investigation would you want before anyone prunes or fells?
What are the typical next steps?
- Do not cut the tree down before exchange.
- Tell your solicitor about any tree preservation order or conservation area.
- If an engineer is instructed, give them photographs of the tree and the crack together.
Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.
Also asked about this
Is every clay postcode a subsidence risk?
No. The ABI is describing a mechanism, not a map that condemns a street. The question is this building, this crack and this tree.
Does the survey measure the distance to the tree?
It may estimate it. It is not a measured survey unless it says so. Do not design a foundation from a paced distance.