Subsidence, settlement and heave

What is clay heave, and why can it follow the removal of a tree?

Heave is the ground moving upwards. On a shrinkable clay, a tree can dry the soil and the soil can swell again after the tree is removed or dies. The building can crack as the ground rises. That is not the same pattern as the ground sinking away.

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?

A surveyor who sees a stump, a recently felled tree or a crack that does not match ordinary settlement should say what they saw. They cannot calculate the swell. An engineer or a soils specialist does that kind of judgement, and only if you instruct them. The ABI’s subsidence material is about downward movement and insurance. Heave is the opposite direction. Do not file it under the same repair.

Felling a large tree to “stop subsidence” can start heave if the clay recovers. Ask the surveyor whether they are advising removal. Often they are not. Ask an arboriculturist and an engineer before anyone cuts a protected tree or a tree in a conservation area. Consent may be required. The survey does not grant it. Costs of advice vary. Ask the firms.

What should you ask your surveyor?

Did you see a stump, a new flower bed, or only a crack?
Are you describing heave, subsidence, or movement you cannot classify?
Should anyone remove a tree on the strength of this report alone?

What are the typical next steps?

Do not fell a tree as a weekend job because of a crack.
Tell the solicitor if a tree preservation order or a conservation area might apply. They will tell you who asks the council.
If an insurer is already involved at a house you own, follow their process. If you do not own it yet, do not open a claim on a policy that is not yours.

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 heave the same as a wall bowing from tie failure?

No. Heave comes from the ground. Tie failure is in the wall. The crack patterns differ. Ask which one the surveyor means.

Can a leak under a slab cause upward movement?

Water can swell some clays. A leak is still a leak. Ask before you call it heave. The drain may be the thing to fix.