Court-Ordered Property Expert Investigation: Conducting the Operations and Challenging the Pre-report

The order for summary proceedings for an expert investigation (référé-expertise) has been obtained, the expert has been appointed, and the deposit has been paid into court. It is at this precise moment that most construction files are lost. Eighteen months of site meetings later, the pre-report attributes the water ingress to a lack of maintenance by the project owner (maître d'ouvrage), adopts a remedial cost estimate half the amount of the quotes produced, and rules out the liability of the structural works contractor: at this stage, the room for manoeuvre has already largely been used up. This guide deals with the period after the order, that is, the phase in which the technical evidence is really built: conduct of the operations, drafting of the written submissions to the expert (dires), and challenging an unfavourable pre-report before it becomes a final report that is difficult to reverse.

After the order: the mission sets the scope of the trial on the merits

A court-ordered property expert investigation made under Article 145 of the French Code of Civil Procedure (CPC) is not an open-ended inquiry. The expert is bound by the heads of mission set out in the decision (Article 265 CPC) and may answer only the questions for which the expert was appointed, save with the written agreement of the parties (Article 238 CPC). A mission drafted in terms that are too narrow produces an unusable report: if the order covers only the defects affecting the waterproofing of the roof terrace, the expert has no need to rule on cracking in the façade, even if it stems from the same structural cause. Obtaining the measure itself, upstream of this phase, is dealt with in our article on summary proceedings for an expert investigation before a property dispute or construction dispute.

First operational consequence: re-read the mission as soon as the order is notified, and not on the eve of the first site meeting. The heads of mission must cover three distinct registers, which are often confused. The description of the defects and of their technical origin. Attribution, that is, the share of each participant in the construction, including the design and works supervisor (maître d'œuvre), the engineering firm and the technical inspector. And the assessment of the cost of remedial works, together with the quantification of consequential losses (loss of rent, rehousing costs, immobilisation of lettable areas). A mission that omits the third register forces a second expert investigation or a debate on quantum before the trial judge, who is poorly equipped to decide it.

Second consequence: the scope of the parties. The expert investigation can be enforced only against those who were summoned to it. An institutional landlord that sues only the contractor holding the waterproofing package, without joining the design and works supervisor, its ten-year liability insurer and, where relevant, the dommages-ouvrage insurer (construction damage insurer), runs the risk of having to start a joint expert investigation again when the defendant calls those third parties in as guarantors. Extending the operations to new parties requires a fresh summons in summary proceedings, on the same conditions of legitimate reason, with a request to extend the mission to the same expert. It is better to anticipate this than to suffer it: each delayed extension lengthens the measure by several months and increases the deposit.

Deposit, time limits and supervision: the administrative management of the measure

The advance on the expert's remuneration is fixed by the decision ordering the expert investigation, which names the party that must pay it into court and the time limit for doing so (Article 269 CPC). Failing payment within the time allowed, the expert's appointment lapses (Article 271 CPC), and the judge must then be seised again, with the risk that the cause of the measure has changed in the meantime. For the applicant, payment of the deposit is a matter of timetable as much as of cash.

During the operations, the expert frequently asks for a further deposit, in particular when using a technical sub-expert (sapiteur) or destructive testing. Refusing to pay is not without consequence: it may lead the expert to file the report as it stands, that is, without the investigations that would have established the technical cause of the defect. In off-plan sale (vente en l'état futur d'achèvement, VEFA) or defective workmanship litigation, this is an economic choice to be made explicitly: the marginal cost of a test set against what is at stake on attribution.

Supervision of the measure falls to a specially designated judge (Article 155-1 CPC). That judge extends the filing deadline, orders production of documents under a penalty where a party defaults (Article 275 CPC), resolves difficulties of access to the premises and rules on requests to extend the mission. Applying to the supervising judge is wrongly perceived as an escalation. It is in fact the only way of documenting, during the operations, that a party has refused to produce the execution documents, the minutes of acceptance or the site meeting records. That refusal, recorded in a decision, will carry weight before the trial judge.

Conducting the site meetings: prepare, produce, have recorded

The accédit is the expert meeting held on site, to which the parties are summoned by the expert (Article 160 CPC). It is where the evidence takes shape in any court-ordered building expert investigation, and its preparation determines the outcome of the file far more than the later oral argument.

Three rules of conduct apply to the project owner or landlord.

• Be assisted by a party's technical adviser, separate from counsel: a policyholder's expert, a structural engineering firm or a construction economist depending on the nature of the defect. The court-appointed expert engages on technical matters; a party represented only by its lawyer undergoes the debate instead of leading it.
• Produce the documents at the start of the measure, not at the end. The parties must hand over to the expert without delay all the documents the expert considers necessary (Article 275 CPC). A document communicated at the last site meeting, after the expert has formed an opinion, almost never reverses an analysis.
• Have matters recorded. Every favourable finding made orally by the expert, every admission by a participant about the conditions of execution, every refusal of access must appear in the note to the parties or the site meeting record. Failing that, request in writing that it be included in the next record.

Destructive tests deserve particular attention. They require the agreement of the owner or occupier, and sometimes that of the co-ownership association (syndicat des copropriétaires) where they concern common parts. A landlord faced with a recalcitrant tenant or a reluctant co-ownership should apply to the supervising judge rather than let the expert conclude that investigation is impossible: the absence of testing systematically benefits the party that disputes attribution.

Finally, the expert may seek the opinion of another technician in a field distinct from the expert's own (Article 278 CPC) and may be assisted by a person of the expert's choosing, under the expert's supervision and responsibility (Article 278-1 CPC). The appointment of a technical sub-expert is not neutral: that person's opinion informs the report, even though the sub-expert has not taken the oath as an expert registered under the conditions laid down by Law No 71-498 of 29 June 1971 and Decree No 2004-1463 of 23 December 2004. The sub-expert's findings must be subject to adversarial debate and may be the subject of a written submission (dire) in the same way as the expert's.

The written submission to the expert (Article 276 CPC): an act of procedural strategy

The dire (written submission to the expert) is the document by which a party sends the expert its observations or complaints. Its regime is set out in Article 276 CPC, a short text each paragraph of which carries a strategic consequence.

The expert must take into consideration the observations or complaints of the parties and, where they are in writing, attach them to the opinion if the parties so request (...). The expert must state in the opinion what action has been taken on the observations or complaints presented.

What the dire produces legally

The written dire has three effects. It obliges the expert to take a position: the expert must state in the report what action has been taken, which reveals, where applicable, that a serious technical objection was avoided without reasons. It is annexed to the report on request, and so enters the debate on the merits without depending on the goodwill of the opponent. It dates the criticism: an objection raised at the third site meeting has a different evidential value from the same objection discovered after the report has been filed.

The practical rule is brutal: what is not written in a dire is lost on the merits. Legally, nothing prevents a report from being criticised before the trial judge, who is not bound by the technician's findings or conclusions (Article 246 CPC). In practice, a court rarely accepts a new technical criticism that surfaces two years after the close of the operations, when the party had the opportunity to put it forward in the adversarial debate. The absence of a dire also ruins any later request for a new expert investigation.

The rule of the summarising dire

Paragraph 3 of Article 276 CPC requires the last written observations to recall briefly the content of those presented earlier, failing which the earlier ones are deemed abandoned. The sanction is formidable and mechanical. A party that has made, over two years of operations, five detailed dires and then sends a last dire devoted solely to quantum is deemed to have abandoned its criticisms on attribution and on method.

The discipline to adopt is therefore simple: every dire after the first must contain a structured recall of the earlier dires, head by head, with an express statement that they are maintained. The last dire, sent in response to the pre-report, must be designed as a complete summarising dire, taking up all the technical grounds maintained since the outset.

Translating the legal question into a technical question

The expert must never give assessments of a legal nature (Article 238 CPC). A dire that asks the expert to classify a defect as ten-year within the meaning of Article 1792 of the French Civil Code is badly constructed: the expert will decline, and the party will have obtained nothing. An effective dire breaks the legal classification down into factual questions the expert can answer.

Rather than asking whether the defect falls within the ten-year guarantee, the expert should be asked about the impairment of the structure's soundness, about the impossibility of occupying the premises under the conditions provided for in the programme, and about the progressive nature of the pathology. Rather than asking whether the off-plan seller has breached its obligations, the gap between the contractual descriptive notice and the execution should be established. Rather than asking who is liable, the chronology of execution, the works orders, the reservations lifted and the non-conformities with the special contract documents should be established. The legal classification is then argued, on a secure factual basis. The criteria that distinguish the three statutory guarantees according to the seriousness of the defect are set out in our article ten-year, two-year or completion guarantee.

Recurring faults

The thirty-page dire, mixing legal argument and recrimination, is not read. A late dire, sent after the time limit set by the expert, may be disregarded, save for serious and duly justified cause (Article 276, paragraph 2). The purely contentious dire, which asserts disagreement without offering a counter-analysis or producing a document, compels the expert to do nothing. A useful dire is short, numbered by head of mission, supported by an identified enclosed document, and ends with a precise request: carry out a particular test, question a particular participant, price a particular remedial option.

Challenging an unfavourable pre-report: quantum, method, attribution

The pre-report, or summary note, is the document by which the expert submits provisional conclusions to the parties before filing. It is not required by any text but belongs to a generalised practice, and is the last useful window. Once the report has been filed with the court registry, the expert is discharged and the discussion moves before the trial judge, in markedly less favourable conditions.

The response to the pre-report is built on three axes, which must be dealt with separately and in this order.

Attribution

This is the economically most decisive axis, because it governs the solvency of the claim. An attribution analysis is challenged on its documentary basis: did the expert rely on the relevant execution drawings, on the site meeting records, on the acceptance minutes and the lifting of reservations? Did the expert examine the contractual mission of the design and works supervisor, that of the technical inspector, the engineering firm's calculation notes? Attribution to the project owner for lack of maintenance requires the expert to identify the maintenance obligation not complied with, its frequency, and the causal link with the pathology observed. Where those elements are missing, the dire must point this out point by point and request further investigation.

Method

Method is challenged on traceability and adversarial process. Did the expert attend on site on the announced dates? Did the expert carry out the announced tests or settle for a visual examination? Did the expert obtain information from third parties, and if so did the expert report it back to the parties? The technician must make known in the opinion the information that informs the questions examined (Article 244 CPC), and carry out the mission with conscience, objectivity and impartiality (Article 237 CPC). A pre-report reproducing word for word the conclusions of an amicable expert report commissioned unilaterally by the contractor's insurer, without any investigation of its own, is a serious ground of challenge. The evidential value given to an amicable expert report, depending on whether or not it is adversarial, is dealt with separately in our article amicable or adversarial expert report.

Quantum

A cost estimate is seldom challenged as a whole, but usefully item by item. Three criticisms bear. The scope of the remedial works adopted: spot repair against general remedial works, where the pathology is progressive. Unit prices: did the expert adopt a price reference, quotes from contractors consulted, or an undocumented lump-sum estimate? Omitted items: remedial design and works supervision, site set-up, protection of existing work, and above all consequential losses for a landlord (loss of rent during the works, rehousing compensation, rent-free periods granted to the tenant). The dire must produce quotes from qualified contractors and ask the expert to explain the discrepancy.

Procedural levers during the operations

Beyond the dire, two tools exist. Challenge of the expert for bias (récusation), possible on the same grounds as those applying to judges, must be brought before the judge who appointed the expert or the supervising judge before the operations begin or as soon as the cause is revealed (Article 234 CPC): this is a strict time limit, which excludes a tactical challenge at the end of the measure. Referral to the supervising judge, by contrast, remains open throughout the operations to obtain an order for an investigation that was refused, for production of a document or for an extension of the mission.

After filing: challenging a court-ordered expert report before the trial judge

Once the report has been filed, challenging a court-ordered expert report requires a choice between several grounds, which cannot usefully be combined.

Nullity of the expert investigation for failure to observe the adversarial principle falls under the regime of nullities of procedural acts: it is a defect of form, which requires proof of prejudice. A party not summoned to a decisive site meeting, or that did not have access to the documents on which the expert relied, may invoke it. It must be raised promptly and in a documented manner, since later regularisation through communication of the report often deprives the ground of effect.

A request for further information or for a new expert investigation relies on Articles 245 and 283 CPC: the judge may invite the technician to supplement, clarify or explain findings or conclusions (Article 245 CPC) and, if the report does not provide sufficient clarification, hear the expert and the parties (Article 283 CPC); the judge may also order a new expert investigation. This is a discretion, not a right. Courts allow it only if the party demonstrates an objective gap, and it is precisely here that the quality of the earlier dires is decisive: a dire left without a reasoned reply from the expert is the best support for such a request.

A private counter-report, prepared by a technician chosen by the party, retains real usefulness. Case law prohibits the judge from basing a decision exclusively on a non-adversarial expert report, but accepts that a unilateral consultation properly placed before the court and submitted for the parties' discussion may be taken into consideration as one item of evidence among others. A precise technical counter-report, limited to two or three decisive points, each tied to an identified finding or conclusion of the report and supported by documents, gives the judge the external element that a purely argumentative criticism lacks. It is not sufficient on its own to found the decision, but it may lead the judge to hear the expert, to invite the expert to supplement the conclusions or to order a new expert investigation.

Conclusion

The value of a court-ordered property expert investigation is determined during the operations. The mission must be re-read as soon as the order is made, the relevant parties summoned without delay, the deposit paid, and every criticism put in a written, numbered and summarising dire within the meaning of Article 276 CPC. The response to the pre-report is the last opportunity to change the expert's opinion. After filing, the trial judge is not bound by the report (Article 246 CPC), but a criticism that was not put to the expert during the operations rarely carries the judge's conviction.