If you’re involved in a property dispute or legal matter, timing is key. One of the most effective ways to support your case is by appointing a RICS expert witness surveyor early in the process. But when exactly should you get one involved—and what can they do?
In this post, we explain when to instruct an expert, how expert witness reports differ from standard surveys, and what you can expect if your case goes to court or mediation.
What Is an Expert Witness Surveyor?
An expert witness surveyor provides an impartial, evidence-based report to assist courts, solicitors, or clients during legal proceedings. They are often instructed for:
- Valuation disputes (e.g. probate, divorce, negligence claims)
- Building defects or workmanship issues
- Lease disputes or dilapidation claims
- Party wall disagreements
Their reports are CPR Part 35 compliant—suitable for court or mediation—and focused on fact, not opinion.
When Should You Instruct One?
In short: as early as possible. Delaying can lead to:
- Missed opportunities to settle before escalation
- Weaker legal positions due to lack of evidence
- Higher legal fees and extended timelines
If you’re entering a formal dispute—whether through a solicitor or mediation—contacting an expert witness surveyor early helps clarify the technical facts and shape your strategy.
Single Joint Expert or Party-Appointed?
Courts and solicitors will often appoint a Single Joint Expert (SJE)—a surveyor instructed by both sides to give neutral advice. In other cases, each party may appoint their own expert.
At Lyman Marshall, we’re experienced in both formats. Our Party Wall Surveyor and expert witness services are always impartial, and our duty is to the court—not to the party instructing us.
What’s in the Report?
Expert witness reports include:
- Clear explanation of the issue (valuation, defect, boundary, etc.)
- Evidence and reasoning behind the findings
- Site photos, measurements, and relevant data
- Declaration of impartiality (CPR-compliant)
Benefits of Acting Early
Appointing a surveyor early in your dispute can:
- Help resolve issues without court intervention
- Save legal costs through early negotiation
- Give your solicitor the clarity they need
Need Advice from a Property Expert?
We help clients across Lincolnshire, Nottinghamshire, Humber and South Yorkshire with expert witness support for a wide range of legal property matters.
- Explore our Expert Witness Services
- Learn about Party Wall Disputes
- Read: Do I Need an Expert Witness Surveyor?
- Read: Acting Early with a Party Wall Surveyor
Call: 01522 438989
Email: hello@lmsurveyors.co.uk
Related reading: What Is an Expert Witness Surveyor and When Do You Need One?.
