Independent Building Expert: How to Check There’s No Conflict of Interest

A Damp Problem: Diagnosis Comes First

You notice damp in the corner of a bedroom, cracks in a façade, or mould under the windows. Before committing to costly repairs, you look for an expert to understand the source of the problem. Condensation? A leak? A thermal bridge? Rising damp? The answer is never obvious without a rigorous diagnosis.

But one fear holds you back: you know homeowners who had their house surveyed, only for the expert to then offer them a brand-new ventilation system, a waterproofing treatment, or repair work. Coincidence? No. That expert wasn’t truly independent.

What Is the Real Role of an Independent Building Expert?

A genuine building expert has one mission only: to diagnose, identify the real cause of the problem, and write a detailed report. Full stop. They carry out no work and sell no materials.

Their tasks include:

• Taking precise measurements (humidity, temperature, thermal bridges, porosity)
• Identifying the source of the problem (condensation, a hidden leak, infiltration, rising damp, thermal bridge)
• Writing a report that can be used by an insurer, a syndic, a lawyer, or a court
• Recommending further investigations where necessary (radon, asbestos, etc.)
• Suggesting possible solutions, without prescribing the actual works

That’s it. The expert has nothing to sell.

Why an Expert Who Diagnoses AND Repairs Is Dangerous

Here lies the major conflict of interest. If an expert diagnoses the problem and then carries out the repairs, their financial interest pushes them to inflate the severity of the diagnosis or recommend work that’s more expensive than necessary. This happens whether consciously or not.

Worse still: whoever sells the ventilation system will always find one to replace. Whoever sells the waterproofing treatment will steer you away from cheaper ventilation or drainage solutions. Whoever has a commercial arrangement with a building firm will systematically direct the homeowner to that firm, even when others are more competent or less expensive.

Conversely, a truly independent expert has no incentive to exaggerate. Their only goal is diagnostic accuracy. If the problem is minor, they’ll say so. If the solutions are simple, they’ll suggest them.

Checklist: 6 Essential Questions Before You Sign

Ask the building expert these questions before accepting their quote. Their answers will tell you everything.

• Do you sell materials? Ventilation systems, waterproofing treatments, dehumidifiers? The answer should be no.
• Do you carry out the repairs yourself? Smoke testing, resin injection, welding, painting? No, always no.
• Do you have commercial ties with building firms? Commissions, partnerships, referral agreements? An independent expert should have none.
• Is your report admissible to insurers? Can it be used in a dispute to support a claim or challenge an insurer’s decision? A genuine technical report must be able to do this.
• Do you carry professional liability insurance? A serious expert is insured against diagnostic errors.
• Can you demonstrate your training and experience? Qualifications, certifications, years of practice, measuring equipment used.

Cassini Expertise’s Commitment

Cassini Expertise operates on this principle of absolute independence.

• Zero work carried out
• Zero materials sold
• Zero commission received
• No partner firm to feed business to
• Reports written to be admissible to an insurer, a syndic, a lawyer, or a court

With 15 years of experience in public works and site project management, the building expert brings together the skills needed to identify building pathologies: structure, building envelope, thermal performance, humidity, air circulation. Measurements are taken with professional Trotec equipment: BA06 anemometer, BC21 dew point sensor, BM31 non-destructive detector, BM22 thermometer, BP21 pyrometer.

4 Frequently Asked Questions

Why Is an Expert Who Sells Solutions Genuinely Dangerous?

Because it creates a systematic bias. An expert with a solution in stock tends to diagnose the problems that solution solves. One who sells ventilation systems will find more ventilation problems. One who sells waterproofing treatments will find more infiltration. Objective diagnosis becomes impossible. What’s more, the homeowner can’t use that report with their insurer in a dispute: the insurer will reject outright a report written by someone with a financial stake in the proposed solution.

Is an Independent Expert Report Accepted by Insurers?

Yes, absolutely. It’s exactly what insurers require: a neutral, objective report written by someone with no conflict of interest. A certified expert, covered by professional liability insurance and with no commercial ties to a building firm, produces a legally admissible report. This report can be used to support an insurance claim, back up a complaint to the insurer, or challenge an insurer’s decision in a dispute.

How Much Does a Genuine Independent Diagnosis Cost?

There’s never a fixed listed price. Every survey is different: the size of the area to be assessed, the complexity of the problem, the measurements required, any further investigations needed. A genuine, tailored diagnosis calls for a custom quote, not a catalogue price. Be wary of experts advertising flat rates for every diagnosis — it’s a sign they barely adapt their work to your actual situation.

What If the Expert Gets It Wrong?

This is exactly why an independent expert must carry professional liability insurance. If the expert misdiagnoses the issue and this leads to unnecessary or incomplete work, the homeowner can claim against that insurance for compensation. An expert without liability cover or recognised qualifications offers no legal safeguard in case of error.

Act With Confidence

Getting a damp problem or cracks surveyed shouldn’t be a source of stress. By asking the six checklist questions above, you’ll quickly gauge how genuinely independent the expert is. A real diagnosis, carried out free of conflicts of interest, gives you accurate information to make the right decision: sometimes the repairs are minor, sometimes action is needed — either way, you’ll know objectively.

Cassini Expertise — Independent building expert, Antibes (Alpes-Maritimes & Var). Call 04 22 46 06 04 — [email protected]

Related Reading

• Mould After Flooding
• Bathroom Damp: Who’s Responsible?
• Water Damage: The First 48 Hours

📅 Mis à jour le 25/09/2026 — Cassini Expertise, expert bâtiment indépendant (06·83·13·40).