It is the first question one in two clients asks on the first call: “who pays the expert for the provisional reception?”. The basic answer is simple — whoever appoints, pays — but it varies significantly in practice depending on the context. Across the 612 missions performed by my practice, I have identified three typical situations that cover 95% of the cases encountered, with reimbursement rules that differ. Here is the complete guide to understand the financial burden and best negotiate your situation.
Case 1: buyer-side expert (the most frequent)
You appoint an expert to support you at the provisional reception. You pay them. This is the most common case in my practice: about 75% of missions.
Typical fee in Wallonia 2026 (see reception expert price for details):
- Apartment: €350 to €850 incl. VAT
- Single-family house: €780 to €1,400 incl. VAT
- Complex villa: €1,100 to €1,800 incl. VAT
This expense is not reimbursable by the contractor unless the expertise concludes on major defects recognised in court. In that case, the judge may shift the expertise costs onto the losing party.
Statistically, in the cases I handle, about 12% result in reimbursement of expert fees by the contractor — generally when a serious defect is confirmed adversarially.
Case 2: third-party adversarial expert (amicable route)
If a serious defect is observed at the reception, you and the contractor can agree on a third-party independent expert, paid fifty-fifty. This amicable route, provided for in most serious turnkey contracts, has several advantages:
- Total cost: €1,500 to €3,000 depending on complexity
- Resolution time: 70% of disputes resolved in under 3 months
- No trial: savings of €6,000 to €12,000 in court costs
- Report binding on both parties
This is the route I systematically recommend when a major defect emerges — much faster than a judicial expertise, and accepted by 8 out of 10 contractors in my experience.
Case 3: judicial expertise (long route)
If you bring the matter before the business court, the judge appoints a judicial expert from an official list. The plaintiff (generally you) pays the advance — typically €1,500 to €4,000 in provision depending on the complexity of the case.
Financial mechanics:
- If you win: costs are reimbursed by the losing party
- If you lose: you remain liable for the expertise costs
- If settled: costs are generally shared
This is why I always advise the adversarial route first — unless the contractor explicitly refuses to cooperate. The judicial route takes 12 to 24 months on average, against 3 to 4 months for the adversarial route.
The useful calculation: cost vs risk avoided
Compared to the average cost of an undetected defect (between €3,000 and €15,000 in repair costs at your expense on the cases I recover post-reception), expertise remains the most profitable investment of the project.
By way of illustration on the most common defects:
- Roof waterproofing defect: €6,800 average repair cost
- Structural crack: €11,200
- Non-compliant insulation: €9,600
- Poorly connected MHRV: €3,400
An expert at €950 who detects one of these defects represents an immediate return on investment.
Pitfalls to avoid
- Don’t confuse buyer-side expert and judicial expert (different legal frameworks)
- Check the professional liability insurance of the appointed expert
- Beware of “experts” without official registration
- Keep the paid invoice for 10 years (proof of engagement)
- Ask for a detailed quote before the mission (not just a global amount)
For the legal framework of expertises in Belgium, see justice.belgium.be.
What next?
If you are unsure which expert mission to appoint, my practice offers several intervention levels: provisional reception expert for the standard mission, construction defects expertise for disputed defects, or a free quote specifying your situation.