The short answer: A home survey considers visible evidence of movement and explains concerns that need investigation. It is not a guarantee that subsidence is absent, and a crack should not be labelled from its width or a photograph alone. The important issue is what the evidence means for your purchase.
What can a survey establish?
The surveyor considers the accessible building as a whole: the location and pattern of cracks, distortion, alterations and surrounding evidence. A report should distinguish observations from conclusions and explain where the inspection cannot establish a cause confidently. That is more useful than treating a home survey as a simple pass-or-fail subsidence test.
Tell the surveyor about cracks you noticed and any history the seller or agent has mentioned, even where a repair now covers them.
Subsidence is not another word for every movement
RICS describes subsidence as downward foundation movement associated with changes in the ground supporting a building. Settlement is different. Cracking can also have causes unrelated to ongoing ground movement, so the word itself should not replace a considered explanation.
A buyer needs to understand whether movement appears historic or recent, what supports that view and whether the evidence is sufficient. These are questions for the inspecting professional, not conclusions to draw from an online checklist.
When more investigation may be needed
Some concerns cannot be resolved at one visit. Records, drainage investigation, an engineer’s assessment or monitoring may be recommended, depending on the evidence. Monitoring can help establish whether movement is continuing; it does not always fit a proposed completion date.
If follow-up is advised, ask for the purpose of the investigation and its priority. Avoid replacing a specific recommendation with a generic assurance from someone who has not assessed the property.
Documents worth asking about
- Previous movement investigations, monitoring records or structural reports.
- Insurance claims and correspondence concerning subsidence or movement.
- Details of underpinning or other structural repairs and associated certification.
- Information about drainage repairs, leaks or relevant tree work.
- Approvals and records for structural alterations that may help explain the building.
Make a purchase decision using evidence
Ask your conveyancer to investigate relevant documents and insurance matters. If insurance or lending is a concern, seek confirmation from the insurer or lender for this particular property; a home survey is not their acceptance decision. Repair quotations should follow an understood diagnosis rather than a guess about what a crack might mean.
Some buyers can accommodate investigation or future work; others cannot. Set out the unresolved questions before negotiating or deciding to proceed.
Choosing the inspection before you book
Visible movement, unusual construction, extensive alterations or poor condition may make a Level 3 survey more appropriate than Level 2. Explain the concern when requesting a quote so the practice can assess suitability and whether additional expertise is required. A more detailed survey still cannot certify concealed foundations or promise that every movement risk has been eliminated.
Frequently asked questions
Does every crack mean subsidence?
No. Cracks have different causes. Their pattern, context and associated evidence need assessment before a reliable conclusion is made.
Can a Level 3 survey rule subsidence out?
It can assess visible evidence in greater detail, but cannot guarantee the absence of concealed problems or replace monitoring where that is needed.
Does subsidence always need underpinning?
No. The appropriate response depends on the cause and evidence. Do not assume a particular repair before investigation and professional advice.
Which survey is right for the property?
Compare our Level 2 Home Survey and Level 3 Building Survey. Share the address, age, construction, alterations and your concerns before choosing. A more expensive level is not automatically the right answer for every home.
Related homebuyer guides
Sources and scope
Guidance checked against the primary sources below on 17 October 2026. This article concerns residential purchases in England and Wales. It is general information, not a property inspection, specialist test or advice on your individual legal position.