Construction Expert Witness in London
Construction disputes — defective work, abandoned projects, final account battles — need an expert who understands both buildings and the courtroom. Wimbledon Surveyors provides construction expert evidence across London for homeowners, contractors and their legal teams. Outline your dispute.
Building Defect Analysis
We inspect and diagnose defective workmanship and materials — from failed extensions to leaking roofs — establishing what went wrong, why, and what competent work would have looked like.
Cost of Remedial Works
Disputes settle on numbers. We produce realistic, itemised costings for putting defective work right, resistant to both inflation by claimants and minimisation by defendants.
Contract and Workmanship Standards
We assess work against the contract, drawings, building regulations and good practice, giving the court a clear benchmark for whether obligations were met.
Adjudication, Arbitration and Court
Our experts support formal proceedings of every kind, with concise reports and clear oral evidence. Ongoing projects can be protected with our contract administration service before disputes arise.
Instruct a Construction Expert
CPR Part 35-compliant and plain-English. See our expert witness services or request a proposal.
Construction Expert Witness: Defects, Workmanship and Cost Evidence
Construction disputes are fact-heavy: what was built, what the contract required, whether the work is defective, what it costs to put right, and who bears responsibility. Judges, adjudicators and arbitrators rely on expert evidence to answer those questions. We provide construction expert witness services across London and Essex — CPR Part 35-compliant reports and testimony on building defects, workmanship standards, remedial scope and cost — for employers, contractors, homeowners, insurers and their solicitors.
Disputes We Report On
- Defective workmanship — work not in accordance with the contract, drawings, Building Regulations or good practice, from single-trade failures to systemic defects.
- Incomplete and abandoned works — establishing what was done, its value, and the cost to complete when a contractor walks away.
- Water ingress and envelope failures — roofs, terraces, cladding interfaces and below-ground waterproofing.
- Structural defects — supported by our in-house structural team for beam, foundation and movement issues.
- Overcharging and valuation of works — assessing interim and final accounts against work actually and properly executed.
- Domestic building disputes — extensions, lofts and refurbishments where homeowner and builder have fallen out.
Method: Inspect, Test Against the Standard, Cost It
A persuasive construction report does three things in order. It records the works objectively — measured, photographed, opened up where permitted. It tests them against the correct yardstick: the contract documents first, then Building Regulations, relevant British Standards and manufacturer requirements, distinguishing defects from incomplete work and from matters of taste. And it prices the remedy realistically — a proportionate remedial scheme, not automatic replacement. Reports that skip any of these steps fall apart under cross-examination; ours are built to survive it.
Forums: Court, Adjudication and Arbitration
We give evidence in the County Court and TCC, and in the faster forums construction contracts use: statutory adjudication under the Construction Act (where reports must be produced to tight timetables) and arbitration. For homeowners, we also support FMB, RICS and ombudsman dispute processes. Early expert involvement — ideally before remedial works destroy the evidence — materially improves outcomes; where works must proceed, we record everything first so your claim survives.
Related Support
Our site inspection records provide contemporaneous evidence when disputes emerge mid-project; our contract administration team untangles payment and certification disputes; and the wider expert witness practice covers valuation and negligence dimensions. If you are heading into a dispute, send us the contract, the key correspondence and photographs, and we will give you a clear early view of the technical merits and a fixed fee for the report.
Frequently Asked Questions
They provide independent technical evidence a tribunal can rely on: whether works are defective against the contract and applicable standards, what remedial work is genuinely required, and what it should cost. Their duty under CPR Part 35 is to the court, not the instructing party.
If the work breaches the contract or was not carried out with reasonable skill and care, generally yes — remedies include the cost of proper remedial works. An expert report establishing the defects, the standard breached and the remedial cost is the foundation of the claim, and often settles it without proceedings.
Wherever possible, no — remediation destroys the evidence. Have the expert inspect and record first, or if works are urgent, photograph and retain samples before they proceed. We can often inspect at short notice to protect a claim.
A statutory 28-day dispute process available under most construction contracts. Its speed demands expert evidence produced quickly and focused tightly on the referred issues — a format we produce regularly alongside full litigation reports.
Fees depend on the scale of the works and issues — single-issue domestic disputes start in the low thousands, complex multi-defect claims more. We quote a fixed fee after seeing the contract, photographs and a summary of the dispute.