Condition
What Is Ground Heave?
Ground heave is the opposite of subsidence: instead of sinking, the ground swells and moves upward, pushing the foundations up. It is most often caused by clay soil expanding as it regains moisture — commonly after large trees are removed, or following changes in drainage. Like subsidence, it can cause cracking and is a structural matter you must disclose. You can sell an affected house with a structural engineer’s report, or to a cash buyer.
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- Heavethe ground rising
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What ground heave is
Where subsidence is the ground sinking, ground heave is the ground rising — swelling upward and pushing against the foundations and structure. It is a less common but equally significant form of ground movement. The upward pressure can crack walls and floors, lift paths and damage drains, similar in appearance to subsidence but caused by the opposite process.
What causes heave
The main cause is clay soil expanding as it takes on moisture. Clay shrinks when dry (causing subsidence) and swells when it rehydrates — so heave often follows:
- Removal of large trees that had been drawing moisture from the soil (the soil then rehydrates and swells)
- Changes in drainage or a leaking pipe adding water to the ground
- Building on recently cleared or made-up ground
A structural engineer or geotechnical assessment identifies the cause.
The signs and effects
| Sign | Detail |
|---|---|
| Cracking | Often vertical or diagonal; can differ from subsidence |
| Lifting floors/paths | Upward movement |
| Sticking doors/windows | From the movement |
| Damaged drains | From ground movement |
An engineer distinguishes heave from subsidence, which matters for the right remediation.
How heave affects a sale
Like subsidence, ground heave is a structural matter that concerns buyers and lenders, can affect mortgageability, and must be disclosed on the property information form. Whether it is active or historic and resolved is the key question — a structural engineer’s report establishes this. Historic, repaired heave with documentation is often still mortgageable; active heave may limit you to cash buyers until resolved.
Selling a house with ground heave
You can sell a house affected by heave. Get a structural engineer’s report, notify your insurer (heave is usually covered by buildings insurance), and either repair and document the works or sell as-is. For speed, an active issue, or to avoid the works, a cash buyer or specialist investor will purchase as-is, price the remediation in, and complete in 7-28 days. You must disclose the heave. See structural issues.
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Written & reviewed by Lisa Hayes, Founder
Lisa Hayes is the founder of Ready Steady Sell and an independent UK home-selling expert with over a decade helping homeowners weigh cash house buyers, property investors and the wider fast house-sale industry — without pressure or hidden fees. Every guide is reviewed for accuracy under our editorial standards.
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Frequently asked questions
Straight answers, no sales talk
What is ground heave?
The opposite of subsidence — the ground swells and moves upward, pushing the foundations up, usually because clay soil expands as it regains moisture.
What causes ground heave?
Mainly clay soil expanding as it takes on moisture — commonly after removing large trees that had drawn water from the soil, or following changes in drainage or a leaking pipe.
How is heave different from subsidence?
Subsidence is the ground sinking (clay drying and shrinking); heave is the ground rising (clay rehydrating and swelling). Both cause cracking but need different remediation.
Do I have to disclose ground heave?
Yes — it is a structural matter you must disclose on the property information form. It appears in surveys and insurance records, and concealment can lead to a claim.
Does heave affect a mortgage?
Active heave can make lenders cautious; historic, repaired and documented heave is often still mortgageable. A structural engineer’s report clarifies the position.
Can I sell a house with ground heave?
Yes — with a structural report, on the open market or as-is to a cash buyer who prices the remediation in and completes in 7-28 days.