The short answer
A structural engineer's report is a written assessment, prepared by a chartered structural engineer (IStructE or ICE), of the condition or adequacy of a building's load-bearing elements. It usually follows a site inspection and sets out what was examined, the engineer's findings (for example whether a crack is structural and active), the likely cause, and recommendations — anything from 'no action needed' to monitoring or remedial design. It differs from structural calculations, which prove a proposed design (a beam, a foundation) is strong enough; a report assesses an existing situation. People commission one when buying a house with cracking, when a mortgage valuation flags concern, after suspected movement, or to satisfy an insurer. A report gives an informed, independent opinion you can act on or show to a lender.
The phrase 'structural engineer report' covers several documents, from a one-issue crack assessment to a full property appraisal. Knowing what one contains helps you ask for the right thing. The points below explain the content and purpose.
At a glance
- Prepared bychartered structural engineer
- Based ona site inspection
- Assessesexisting structure / a defect
- Not the same asdesign calculations
- Common triggercracking, house purchase, lender
What a report typically contains
While the depth varies with the job, a structural engineer's report usually follows a recognisable structure so the reader — a homeowner, buyer, lender or insurer — can act on it. The value of that structure is that each section answers a different question, and the reader can go straight to the part they need: a lender turns first to the findings and recommendations, a buyer's solicitor to the scope and limitations, and a homeowner to the likely cause and what to do next. A good report is written to be understood by a non-engineer, not just by another professional.
- Scope and limitations: what was inspected and what was not (for example, areas hidden behind finishes).
- Observations: the cracks, movement or defects seen, often with photographs and crack widths.
- Findings: whether the issue is structural, and whether it appears active or historic.
- Likely cause: subsidence, settlement, thermal movement, overloading, or a defect.
- Recommendations: from 'no action' to monitoring, further investigation or remedial design.
Report versus calculations
People often use 'report' to mean two different things. A condition report assesses an existing building or defect; calculations prove a proposed new design will stand up. The table shows the distinction.
| Document | Purpose | Typical trigger |
|---|---|---|
| Condition report | assess existing structure | cracking, house purchase |
| Structural calculations | prove a new design | extension, beam, loft |
| Inspection report | record a site visit | monitoring, sign-off |
| Specialist report | subsidence, fire, heritage | specific problem |
Indicative breakdown for guidance. The right document depends on whether you are assessing existing structure or designing new work.
When you need one
A structural engineer's report is worth commissioning when you need an informed, independent opinion on existing structure. The most common triggers are buying a house where the survey or mortgage valuation has flagged cracking or movement; noticing new or widening cracks in your own home; a lender or insurer asking for a report before they will proceed; or a dispute — for example over a neighbour's building work. It is the document that turns 'those cracks look worrying' into a clear answer: structural or not, active or historic, and what (if anything) to do.
Who can write one and why it matters
For the report to carry weight with Building Control, mortgage lenders, insurers and buyers' solicitors, it should be written by a chartered structural engineer — someone with MIStructE (Institution of Structural Engineers) or MICE (Institution of Civil Engineers) membership, professional indemnity insurance and the judgement to interpret what they see. An unqualified person's opinion may be honest but will rarely be accepted where it counts. When you commission a report, confirm the author is chartered and that the report will be signed and on letterhead — that is what makes it usable in a transaction, a claim or a Building Control conversation.
How to read and use the report
A report is only useful if you act on the right part of it, so it helps to know where to look. Start with the conclusions and recommendations, usually near the end — this is where the engineer states plainly whether the issue is structural, whether it is active, and what (if anything) to do. Then read the scope and limitations at the start, because they tell you what the engineer could and could not inspect; a recommendation for 'further investigation' is not the engineer hedging, it is them being honest that a definite answer needs something they could not see on the day, such as the foundation or a hidden timber. Pay attention to the language of certainty: phrases like 'consistent with historic settlement' carry a different weight from 'requires monitoring to confirm'. If you are using the report for a lender or insurer, check it addresses their specific concern and is recent enough for them. And keep the report on file with any calculations and Building Control certificates — a future buyer's surveyor may ask to see it years later.
- Conclusions first: the engineer's plain verdict and recommendations.
- Scope and limitations: what was and was not inspected.
- Certainty of language: confirmed findings versus areas needing more work.
- Keep it on file: useful for lenders, insurers and a future sale.
Frequently asked questions
Is a structural engineer report the same as a survey?
Not quite. A RICS building survey assesses a whole property's condition and is done by a chartered surveyor. A structural engineer's report focuses on load-bearing elements and movement and is done by a structural engineer, often after a survey recommends 'further investigation'.
How much does a structural engineer report cost?
A focused report on a single defect is commonly £300–£700, while a fuller assessment of a property can be £500–£1,300, depending on size, age and whether monitoring or trial holes are needed. Ranges only — it depends on the job.
Will a mortgage lender accept a structural engineer report?
Usually, if it is written by a chartered structural engineer, signed and on letterhead, and addresses the lender's specific concern. Some lenders specify what the report must cover, so check before you commission it.
Sources & further reading
- IStructE — find a chartered structural engineer
- ICE — Institution of Civil Engineers
- RICS — home surveys
Figures on this page are typical UK ranges drawn from published sources and depend on your specific project. They are guidance, not a quotation.