Cracks are the most common reason homeowners call a structural professional — and the most misunderstood. Most cracking is cosmetic; some signals progressive movement that gets more expensive every month it is ignored. A professional structural crack assessment tells you which you have, what caused it, and exactly what to do next.
How We Assess Cracking
- Crack mapping and measurement — location, width, direction and pattern, categorised against the BRE Digest 251 scale (Category 0–5) that lenders and insurers recognise
- Cause diagnosis — distinguishing thermal and shrinkage movement from foundation movement, subsidence, heave, wall-tie failure, lintel failure and overloading
- Context inspection — trees and drainage (the two great causes of clay-soil subsidence), alterations, and the age and construction of the building
- Written report — plain-English findings, category, cause, prognosis and a prioritised repair recommendation
When Monitoring Beats Guesswork
Where it is unclear whether movement is historic or ongoing, the professional answer is measurement over time, not speculation. Our crack and movement monitoring service uses precise periodic readings to establish whether movement is progressive — evidence that satisfies insurers and prevents unnecessary underpinning.
Why It Matters for Buyers and Owners
For buyers, cracking flagged in a Level 3 building survey can be negotiating gold or a reason to walk away — but only a proper assessment tells you which. For owners, early diagnosis of subsidence keeps insurance claims clean and repair costs contained. And where cracking follows a neighbour’s building works, our assessment supports party wall damage claims.
Worried about a crack? Book an assessment — fast appointments across Manchester, Birmingham, London and the UK, with fixed fees quoted up front.
If cracking suggests ground movement rather than structural overload, a dedicated subsidence survey will establish whether the movement is active and what monitoring is appropriate.
Our Crack Assessment Process
A structural crack assessment starts with classification — width, pattern, direction and location tell an experienced engineer most of the story — followed by identifying the mechanism: thermal movement, lintel failure, wall-tie corrosion, foundation movement or simple shrinkage. We categorise damage using the BRE Digest 251 scale that insurers and lenders recognise, so the outcome is not just a diagnosis but a document other professionals will act on.
What Happens Next
Most assessments end with reassurance and a repair specification. Where movement may be ongoing we recommend crack monitoring over an agreed period rather than premature underpinning, and where ground movement is confirmed our subsidence survey service takes over — including liaison with insurers, as explained in our subsidence claims guide.
Which cracks are serious?
As a guide: hairline and up to ~3mm cracks are usually cosmetic; diagonal stepping cracks, cracks wider at one end, or cracking paired with sticking doors deserve assessment. Our post on cracks in walls covers the signs — or skip straight to a fixed-fee assessment on 020 4579 8270.