An expert witness is a specialist whose knowledge lets them give opinion evidence to a court — something ordinary witnesses cannot do. In property and construction disputes, that specialist is usually a chartered surveyor: someone who can tell the judge whether the crack in your wall was caused by next door’s basement dig, whether a party wall award was validly made, or where a disputed boundary truly runs.
What makes someone an expert witness?
Three things: recognised expertise (qualifications plus real practice), independence, and compliance with the court rules — in England and Wales, Civil Procedure Rules Part 35. The expert’s overriding duty is to the court, not to whoever pays them. A report must set out instructions, facts, reasoning and a statement of truth; a partisan “hired gun” report is worse than none.
What does a surveyor expert witness actually do?
- Inspects the property and gathers measured, photographic evidence
- Analyses the issues against legislation, case law and RICS guidance
- Produces a CPR 35 compliant expert witness report
- Answers written questions, meets the other side’s expert and prepares joint statements
- Gives oral evidence at trial, arbitration or adjudication if required
When would I need one?
Typical triggers: damage after a neighbour’s works with causation disputed; challenges to a party wall award or surveyor conduct; boundary disputes heading to court; and defective building work claims. Courts increasingly favour a single joint expert instructed by both sides to keep costs down.
What does an expert witness cost?
Hourly rates for surveyor experts in London typically run £150–£300, with full CPR 35 reports from roughly £1,500. A clear fee estimate should always precede instruction.
Need an expert witness surveyor?
Our RICS surveyors provide expert witness services across London for party wall, boundary and construction disputes. Call 0204 579 8270 for a confidential initial view.
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