Asbestos and Lead: Pre-Work Diagnostics in the Alpes-Maritimes and Var

Asbestos and lead before works: diagnostics and expert assessment are two distinct professions

In the Alpes-Maritimes and the Var, renovating a property built before 1997 (for asbestos) or before 1949 (for lead) requires a pre-work diagnostic (DAT). This survey, governed by Articles L. 1334-13 and R. 1334-14 et seq. of the French Public Health Code, must be carried out by a survey operator certified by a COFRAC-accredited body. Cassini Expertise, an independent building expert based in Antibes, is not an asbestos or lead diagnostician: this is a separate certification, subject to its own training, insurance and oversight requirements. We do, however, step in for technical expert assessments when a dispute, a defect or a claim arises after a diagnostic has been carried out, during or after the works.

This page clarifies the line between the regulatory diagnostic and the adversarial expert assessment, and explains when our expertise is called on in an asbestos/lead context.

The pre-work diagnostic: a strict regulatory requirement

Scope and certified operators

The pre-work diagnostic (DAT) is mandatory for any demolition, major refurbishment or renovation project that could release asbestos fibres or lead dust. It must be carried out by a certified survey operator (an « asbestos without endorsement » or « asbestos with endorsement » certification depending on the type of property, or a « lead » certification for the CREP survey), holding a valid competence certificate and professional liability insurance.

The survey covers List A materials (sprayed coatings, pipe lagging, false ceilings) and List B materials (floor tiles, renders, adhesives, fibre-cement roofing) as defined by the amended decree of 12 December 2012. For lead, the lead exposure risk assessment (CREP) covers coatings (paints, renders) in dwellings built before 1 January 1949, under Articles L. 1334-1 et seq. of the Public Health Code.

Methodology and deliverables

The diagnostician carries out a visual inspection, non-destructive probing and sampling, with samples analysed by a COFRAC-accredited laboratory. The final report locates the asbestos-containing materials (ACM) or lead surfaces, classifies their condition (levels 1, 2 or 3 for lead; degradation state for asbestos) and issues management recommendations: removal, encapsulation, or periodic monitoring.

This document engages the diagnostician’s liability (Article 1231-1 of the Civil Code in the event of non-performance or a defective survey) and is a condition for obtaining a building or demolition permit (Article R. 431-16-2 of the Town Planning Code).

When does a building expert step in on asbestos or lead cases?

Disputing the diagnostic: adversarial expert assessment

A property owner, project owner or contractor may dispute the validity, scope or findings of an asbestos or lead diagnostic. Common grounds include:

• Accessible areas omitted (attics, service ducts, basements),
• No samples taken from visually suspect materials,
• Inconsistencies between on-site observations and laboratory results,
• Non-compliance with standard NF X 46-020 (asbestos survey methodology) or the CREP protocol.

In this case, Cassini Expertise carries out an adversarial expert assessment: a joint site visit, a critical review of the initial report, counter-sampling where necessary (entrusted to a separate laboratory), and a detailed technical opinion. This report can support a contractual liability claim against the diagnostician (Grasse Judicial Court for Antibes, Cannes, Grasse; Nice Judicial Court; Toulon Judicial Court; Draguignan Judicial Court depending on where the property is located).

Defects arising during or after works involving asbestos or lead

The unexpected discovery of asbestos or lead during works, when no survey had been ordered or the DAT proved incomplete, requires the immediate suspension of the works (Article R. 4412-97 of the Labour Code) and can trigger several types of disputes:

• Dispute between the project owner and the diagnostician: the project owner seeks compensation for the cost of protective measures (containment, decontamination, disposal of hazardous waste) and for project delays. The building expert analyses the cause of the survey failure (was a zone left unvisited? a material left unsampled?) and quantifies the loss.
• Dispute between the project owner and the contractor: a contractor exposed to asbestos without prior notice may invoke a substantial change in the conditions of performance (Article 1195 of the Civil Code) and claim additional costs or suspension of the contract. The expert assesses whether the contractor could reasonably have detected the presence of asbestos (visible or hidden material), and whether the project owner met its obligation to provide the DAT (Article R. 4412-97 of the Labour Code).
• Health or environmental damage: where workers or occupants are exposed (asbestos fibres in the air, lead dust), the expert may be instructed by the insurer of the diagnostician, the project owner or the contractor to establish the origin, extent and consequences of the exposure. These cases often fall under the jurisdiction of the labour tribunal (for employees) or the judicial court (tortious civil liability, Article 1240 of the Civil Code).

Assessing compliance costs and remedies

When a diagnostic reveals the presence of ACM or lead, the property owner or project owner must budget for safety works: removal, encapsulation, replacement of lead pipework, or setting up containment zones. Cassini Expertise steps in to:

• Precisely cost the necessary works (quantities, technical alternatives, access constraints),
• Check the consistency of quotes from specialist contractors (SS4 certification for asbestos removal, RGE qualification for lead work),
• Check, once the works are complete, that the interventions comply: airborne fibre measurements (5 fibres/litre threshold for zone clearance), handover of premises under standard NF X 46-090.

In the event of a loss (partial collapse of a fibre-cement roof, degradation of lead-based render), the expert also acts on behalf of the building-damage or ten-year liability insurer, to determine whether the defect stems from a latent defect (Article 1641 of the Civil Code), a design fault or a workmanship error.

Our methodology for asbestos/lead expert assessments

Preliminary document review

Before any site visit, we gather the technical file:

• Asbestos survey report or CREP, with location plan and analysis results,
• Execution drawings, technical specifications and material data sheets,
• Building permit or prior works declaration,
• Correspondence between the parties (letters, formal notices, bailiff’s reports).

This stage identifies discrepancies between the initial survey and the actual state of the site, and pinpoints the areas to examine first.

Joint site visit and technical findings

On site, we carry out:

• A comprehensive photographic record of the areas concerned (before/after works if the project is complete),
• A check for the presence or absence of suspect materials (sprayed coatings under slab soffits, fibre-cement ducts in attics, flaking paint on old door and window frames),
• Measurement of the treated surfaces and volumes of waste removed,
• A check that the initial report’s requirements were followed (containment, signage, waste traceability).

We do not carry out asbestos sampling or X-ray fluorescence measurements ourselves (these are reserved for certified operators), but as part of our assignment we can recommend a counter-survey by an independent third party if the initial diagnostic is clearly incomplete or incorrect.

Drafting the expert report

The report, delivered within 15 to 30 days depending on the complexity of the case, includes:

• A summary of each party’s respective responsibilities (diagnostician, project owner, contractors, health and safety coordinator),
• A critical review of the asbestos or lead diagnostic: compliance with the standard, completeness of the survey, relevance of the recommendations,
• A description of the defects or failures observed,
• A determination of technical liability with regard to contractual and regulatory obligations (Articles 1792 et seq. of the Civil Code for builders, Article 1231-1 for the diagnostician),
• Costing of the compliance or repair works, and of the loss suffered (delay, extra costs, loss of business).

This report can be used before the competent judicial court (Grasse Judicial Court for Antibes, Cannes, Mougins, Vallauris; Nice Judicial Court for Nice, Menton, Cagnes-sur-Mer; Toulon Judicial Court; Draguignan Judicial Court for the Var), or in prior mediation.

Areas we cover in the Alpes-Maritimes and the Var

Cassini Expertise works throughout the Alpes-Maritimes (06) and the Var (83), including Antibes, Cannes, Grasse, Nice, Menton, Cagnes-sur-Mer, Vallauris, Toulon, Hyeres, Frejus, Draguignan and Bormes-les-Mimosas. We work for private individuals, homeowner associations, social housing landlords, contractors, architects and insurers, on both contentious matters and amicable costing and compliance-check assignments.

Conclusion: diagnostics and expert assessment, two complementary skills

The pre-work asbestos or lead diagnostic is a specialist certified profession, distinct from that of a building expert. Cassini Expertise does not carry out these regulatory surveys, but steps in downstream: disputing a diagnostic, resolving disputes arising from an unexpected discovery, assessing compliance costs, or checking works on completion. Our role is to analyse the technical causes, establish legal liability, and cost the losses involved, entirely independently.

For any question relating to an asbestos or lead dispute in the Alpes-Maritimes or the Var, contact Cassini Expertise on 04 22 46 06 04. We will review your case and guide you toward the right approach (amicable, pre-litigation or judicial expert assessment).

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