Construction Expert Witness

Construction expert witness services for solicitors, contractors and property owners

Construction disputes turn on technical evidence. Survey Merchant provides RICS chartered surveyors as construction expert witnesses for court proceedings, arbitration and adjudication across England and Wales — every report prepared to the standard required by CPR Part 35, with the expert's overriding duty owed to the tribunal. Whether the case needs an expert witness in building construction methods, workmanship standards or remedial costs, the panel matches the surveyor's specialism to the issues pleaded.

Construction disputes the panel's experts act in

• Building defect claims — defective workmanship, failed extensions and conversions, roofing and structural failures, damp and waterproofing defects.
• Incomplete or abandoned works — scope, quality and cost-to-complete assessments.
• Contract administration disputes — certification, variations and practical completion disagreements.
• Professional negligence — claims involving surveyors, designers and contract administrators.
• Adjudication and arbitration support — fast, technically robust evidence to statutory deadlines.

Construction disputes the panel covers

Most instructions to a construction defect expert witness fall into five groups: defective workmanship claims against builders and contractors (extensions, loft conversions, renovations left incomplete or dangerous); water ingress and damp traced to design or installation failures; structural movement attributed to adjacent construction or inadequate underpinning; disputes over the scope and value of works done, including final account disagreements; and professional negligence claims where an earlier survey or design missed what it should have caught. In each case the expert inspects, documents with photographs and measurements, researches the applicable standards (Building Regulations, NHBC standards, manufacturer instructions, British Standards) and states an independent opinion on causation and remedy costs.

Who instructs a construction expert witness?

Instructions come from both sides of the same disputes: solicitors acting for homeowners against builders — and for builders against homeowners; contractors and subcontractors in final account, variation and defect arguments; insurers handling defective-workmanship and escape-of-water claims; developers and freeholders pursuing warranty and remedial claims; and homeowners directly, most often over a domestic extension or renovation that went wrong. A dated schedule of condition recorded before works start is frequently the strongest exhibit in these cases — where one exists, the expert builds the causation analysis around it.

Adjudication, arbitration and court

Construction disputes rarely start in court. Our experts prepare reports suitable for adjudication under the Construction Act, for arbitration, and for TCC and county court litigation — the same CPR Part 35 discipline applies throughout, so evidence prepared early is not wasted if the matter escalates. Appointments are accepted as party expert or Single Joint Expert. Fees are quoted fixed or hourly before instruction, with typical reporting 2–4 weeks from inspection.

Single Joint Expert or party-appointed

Appointments are accepted as Single Joint Expert — increasingly the courts' preference for proportionate construction claims — or as a party-appointed expert prepared to produce joint statements, answer Part 35 questions and give oral evidence under cross-examination.

What does a construction expert witness report contain?

A construction expert witness report tells the tribunal, in a structure it can test: what was built and when; what the contract, drawings and Building Regulations required; what the inspection found, defect by defect; what caused each failure; and what it will cost to put right. Fact is kept strictly separate from opinion, and where competent professionals could reasonably differ, the report says so and explains the expert's position within that range.

• Site inspection with photographic schedules of the works and defects
• Analysis of workmanship against contract documents, Building Regulations and good practice
• A CPR Part 35-compliant report with the expert's declaration and statement of truth
• Repair methodology and costings evidence where directed

After service of the report, the panel's experts answer written Part 35 questions, meet the opposing expert to agree a joint statement narrowing the technical issues, and give oral evidence at hearing where required — in construction cases the joint statement stage settles a striking share of claims.

Fees and timescales

Fixed or hourly fees quoted on the pleadings and volume of documents; typical reporting timescales are 2–4 weeks from inspection, faster for adjudication timetables.

Where the panel provides construction expert witness services

Instructions are accepted across England and Wales, with dedicated expert witness coverage pages for London — where basement and refurbishment disputes dominate — Leeds, Guildford and Surrey. Related disciplines sit on the same panel: party wall expert witness evidence where neighbouring works caused damage, and surveyor negligence expert witness evidence where a professional's earlier report is in issue.

See our full expert witness services or request an expert CV and fee quote →