January 2021. First provisional reception on my own. I arrived on a Liège site, confident in my 47-point checklist learned by heart. Four hours later, while rereading my notes at the kitchen table, I had missed a structural defect in the basement — a stepped crack on the load-bearing wall, perfectly visible if you took the time to look. The owner discovered it six months later, at his own expense, when he wanted to fit out a laundry room. The repair bill: 8,400 €. My shame: intact, five years later.
Five years and 612 receptions later, I see the same mistakes recur — among owners, contractors, and sometimes the experts themselves. Here are the 10 that still cost me sleepless nights, and that cost my clients much more when allowed to slip through.
1. Signing the minutes on the same day, without quiet review
This is the most common mistake and by far the most damaging. The contractor generally has an interest in wrapping up the signature on the spot — he applies friendly pressure (“we’re all tired, let’s get it done”), the document is handwritten, and you sign. Except that ten defects later, you realise the crack you photographed is not in the table. And it is too late to add it without written agreement from the contractor, who will not come back spontaneously.
I saw a couple sign minutes at 9:30 pm, after a five-hour visit, because the contractor was leaving on holiday the next morning for two weeks. Three critical defects were missing from the document — a watertightness defect at the sliding door sill, an incipient crack on the gable, and a reversed ventilation connection I detected later during an intervention. Final cost: 11,000 € borne by them, because recourse for defects not mentioned in the minutes systematically goes through legal expertise, long and expensive, without guarantee of success.
2. Confusing micro-crack with structural crack
Not all cracks are equal. A shrinkage micro-crack (less than 0.2 mm, no displacement) is cosmetic: the concrete is drying, that’s it. A 2 mm crack with displacement between the lips, or stepped orientation, is a structural warning that can signal differential settlement or a foundation defect. Yet over 612 minutes of reception, I have seen 184 owners either ignore the second, or worry about the first.
The useful reflex: photograph all cracks with a metal ruler placed next to them, and note the orientation (horizontal, vertical, stepped). A vertical crack above a door is almost always a lintel defect. A horizontal crack mid-height on the wall often betrays a damp-proof course defect. A stepped crack on an outer wall is foundation movement until proven otherwise.
If I had to keep only one tool in my bag, it would be a digital calliper: 22 € at Brico, and you have the objective measurement that can sway a case before a judge. Also note the length of each crack, and conduct a photographic follow-up six months later. Cracks that lengthen or widen over time warrant additional expertise — those that remain stable are usually benign.
3. Believing the architect will act as expert
The architect who supervised the construction is in a conflict of interest. His mission ends at delivery; certifying the absence of defects would be to contradict himself. And if a defect exists — he could be partly responsible, under his control mission. Difficult, in those conditions, to point out his own shortcomings.
For reception, demand an independent expert. If your architect tells you it’s not necessary, ask yourself why. The vast majority of serious architects I meet themselves recommend the presence of a third-party expert. It is even a mark of professional confidence, not distrust — a good architect knows he will have missed something, and prefers a fresh eye to see it before the client discovers it alone two years later.
The fee for an expert for a provisional reception in Wallonia ranges between 600 and 1,200 € VAT included, depending on the size of the property. Compared to the average cost of an undetected defect (between 3,000 € and 15,000 € across the cases I handle), the calculation does not take long.
4. Forgetting the basement and the loft
These unfinished areas are the first to show real signs of structural stress: no plaster to hide them, no paint to absorb them. Yet I regularly see minutes that don’t even mention their inspection. A third of the hidden defects I handle post-reception come from there — foundation crack, watertightness defect in the basement walls, incipient damp marks on the loft ceiling, infiltrations at duct passages.
Access is often uncomfortable. Improvised ladder, headlamp, old jeans. But it is the most profitable area of the entire visit. I systematically spend at least 30 minutes in each basement, and as much in the lofts when they are accessible.
5. Accepting “no reservations” out of politeness
“But we’ll sort out the small finishes between us, right?” I have heard this sentence 400 times. And the “small finish” becomes a point of friction six months later, when the contractor has forgotten, moved his workshop, or simply decided it is no longer a priority.
Everything, absolutely everything, must go into the minutes. Including minor defects: the misaligned socket, the skirting joint that protrudes, the squeaking door handle. Better minutes with 30 reservations lifted in 6 weeks than empty minutes and 6 months of registered letters. The politeness of the signature is also what deprives 4 owners out of 10 of a simple recourse.
“Minutes of reception are the most important legal act of your entire construction project. Yet we often treat them as an administrative formality.”
6. Underestimating the weather on the day
A reception in pouring rain is a failed reception for watertightness: impossible to assess a roof defect when water has been streaming for three hours, nor to evaluate the drainage of an already soaked terrace. A reception in mid-summer means missing insulation defects: thermal bridges are only visible in winter, when the temperature gap between inside and outside reveals cold spots to the touch.
I always negotiate the date with one simple goal: 12-18 °C, dry for 48 hours, to obtain workable conditions. If we cannot wait, I note it explicitly in the minutes — “reception carried out in continuous rain, the watertightness of the terrace roof could not be verified and will be subject to a counter-visit”. This clause saves cases.
7. Not testing ventilation, mixers and heating under real conditions
Many experts inspect cold: they look, they note, they switch nothing on. But a thermostatic mixer that leaks at 60 °C does not leak at 20 °C. A double-flow ventilation unit noisy at full speed is inaudible in night silent mode. A boiler that clatters at start-up will not do so if it has been off for 10 hours.
My protocol: on arrival, I set the heating to maximum demand and the ventilation to boost. While I do my walk-through, the equipment loads up. At the end of the visit, 90 minutes later, I go back to listen, touch, measure the hot water outlet temperature. That is where half of the plumbing defects appear.
8. Neglecting tiling and silicone joints
Apparently an aesthetic defect, but the repair cost is high: a tiled floor outside flatness means full removal and relaying, i.e. 80 €/m² minimum. Poorly smoothed silicone joints around baths, tiles flush with the joint that hurt the feet, flatness out of DTU tolerance (3 mm under the 2 m rule maximum): these are the defects that irritate daily and that no one fixes six months later.
Check with a 60 cm spirit level and a 2 m metal rule. For the joints, run your fingernail across: if it catches, it is poorly smoothed.
9. Not demanding technical documents at the time of the minutes
Applicable DTU standards, technical sheets for the materials installed, product warranties (boiler, windows, ventilation), insulation certificates, final EPC, RGIE electrical control certificate, gas inspection. Without these documents, no serious recourse later: impossible to prove that an installed product does not match the quote, or that the announced insulation class is not met.
The 5 essential documents to demand at the minutes: (1) the final EPC, (2) the RGIE electrical control, (3) the gas inspection, (4) the technical sheets of windows and boiler, (5) the signed ten-year liability certificate. Without them, you sign a blank cheque.
10. Not setting a written deadline for lifting reservations
“In the coming weeks” means nothing before a judge. The Breyne Law statutory deadline is 6 months maximum for lifting reservations, but in practice you need to be much more precise: 30 days for minor defects (aesthetic, finishes), 90 days for heavier defects (watertightness, insulation, equipment). Without a written deadline in the minutes, the contractor has every opportunity to drag, and your case ages with him.
I systematically add, on the last line of the minutes, a short formula: “The reservations shall be lifted within X days of signature, failing which the retention guarantee shall remain blocked and a formal notice shall be sent.” This sentence changes the whole balance of power. In five years, I have only seen it refused once — and it was by a contractor I should have been wary of from the start.
For each reservation, also write a precise description rather than a general formula. “Repair kitchen tiling” means nothing. “Repair of the tile joint between the sink and the north-side wall, over 80 linear cm, with sanding and new sanitary silicone” is actionable, measurable, verifiable.
Five years later, I keep learning. Every site brings its surprise — a defect I had never seen, a sly contractor trick, an unexpected piece of case law. If you are an owner and you are reading these lines before your reception: hire an expert. Not out of mistrust toward your contractor, but because reception is the most structuring legal act of your entire project. And it only happens once.