Cockroaches in Lunéville: the OPH is planning a shock treatment to empty the Hercule and Dragon buildings (July 2026)

"There are some everywhere, everywhere, everywhere" — Cathy, a tenant on rue Florent Schmitt in Lunéville (Meurthe-et-Moselle), interviewed by ICI Lorraine on 23 July 2026. In the Hercule and Dragon buildings of the Office Public de l'Habitat de Lunéville-Baccarat, 72 flats are infested with cockroaches — and some with bed bugs — for nearly two years. Cockroaches in washing machines, dishwashers, fridges, induction hobs: the insects have colonised even the appliances. Faced with the failure of flat-by-flat treatments, the OPH is preparing a shock treatment: complete evacuation of both buildings for a full day, with temporary rehousing in the municipal gymnasium. A breakdown of a case emblematic of the cockroach crisis in collective housing in France, and the ProDeratisation protocol for social landlords.

What is happening on rue Florent Schmitt in Lunéville

The ICI Lorraine (Meurthe-et-Moselle / Vosges) report broadcast on Thursday 23 July 2026 documents a situation that many French social landlords are now dreading: a cockroach infestation rooted for nearly two years in a social housing estate, which has colonised the appliances and survived several targeted treatment waves. Facts:

• Location: rue Florent Schmitt, Lunéville (Meurthe-et-Moselle, 54), Hercule and Dragon buildings. Lunéville is a town of 18,000 inhabitants 35 km east of Nancy.
• Landlord: Office Public de l'Habitat (OPH) de Lunéville-Baccarat, led by director Maxime Fresse.
• Toll: 72 flats concerned in both buildings, infestation by German cockroaches (Blattella germanica) combined, in some flats, with bed bugs (Cimex lectularius).
• Duration: nearly two years of continuous infestation. Tenants describe a massive presence, including in broad daylight, in the kitchen, bathroom and sometimes the bedroom.
• Most striking symptom: cockroaches in the washing machines, dishwashers, refrigerators and induction hobs. Several appliances have been replaced several times by tenants, sometimes by the landlord.
• Cause of the failure of the first interventions: only half of the 72 flats were effectively treated during the previous campaigns — the others were vacant or tenants did not grant access to their flat.
• Testimony: Cathy, tenant: "There are some everywhere, everywhere, everywhere. The worst is that they get into the dishwashers, into the washing machine". Her partner Jean-François sums it up: "It is infernal day and night".
• Social consequence: "We can no longer invite people, so we stay all alone, withdrawn into ourselves" (Cathy).

"If even one [flat] does not want to [cooperate], we cannot treat the whole building" — Maxime Fresse, director of OPH Lunéville-Baccarat, ICI Lorraine, 23 July 2026.

Cockroach in a dark corner of a kitchen, illustration of a domestic infestation in collective housing

Why this case is emblematic of summer 2026

Lunéville is not an isolated case. It is the convergence of five factors now found in the majority of cockroach crises in collective housing in France — and which are piling up with the bed bug crisis that we documented in Roissy-en-Brie ten days ago.

1. An infestation settled for more than 18 months

At 25-30 °C and with access to water, the German cockroach (Blattella germanica) completes its cycle in 40-50 days and the female produces an ootheca (egg sac) of 30 to 40 eggs every 6 weeks. An untreated infestation for 18 months is 8 to 10 uncontrolled generations — several hundred thousand individuals, cumulating natural mortality and reproduction. At this stage, no flat-by-flat treatment works anymore: the insects migrate permanently from one flat to another via service ducts, pipes and skirting boards.

2. The statistical failure of flat-by-flat treatment

This is the heart of the problem and the key lesson from the Lunéville affair. The OPH director, Maxime Fresse, says it himself: "If even one [flat] does not want to [cooperate], we cannot treat the whole building". In other words, treating 50% of the 72 flats, as was done in the previous campaigns, is the same as doing nothing: the remaining 50% re-infest the treated flats in less than three weeks. It is mathematical, and this is what any serious Certibiocide pest control company explains to its customers before signing a quote.

3. The colonisation of appliances

Cockroaches move into washing machines, dishwashers, fridges and induction hobs for two reasons: the heat (the heating elements maintain a temperature of 40-50 °C which is favourable) and humidity (door seals, drip trays). An infested appliance, even chemically treated, becomes a reservoir again within a few days. Hence the obligation, in a shock treatment, to move, dismantle and treat the appliances one by one — or to send them to a controlled waste facility.

4. The June-July 2026 heatwave

Summer 2026 is marked by overnight temperatures above 20 °C over much of France, including Meurthe-et-Moselle. This factor accelerates the cockroach reproduction cycle (+30% compared to a temperate summer) and explains the multiplication of reports observed by OPHs, private landlords and Certibiocide companies. In Lunéville, the OPH reports a clear deterioration since the beginning of June.

5. The combination of cockroaches + bed bugs

Several flats in Hercule and Dragon are affected by both pests. This combination, still rare five years ago, is now a marker of long-standing infestations in collective housing: it reflects a general failure of maintenance, a high turnover of occupants and saturation of disinsection services. When a single flat has both, it is a warning sign: the whole building must be treated, not the flat.

"It is no longer flat by flat that we need to act, but across the entire building" — Nicolas Chateau, association Si Toit Lien (fighting against unfit housing), ICI Lorraine, 23 July 2026.

The shock treatment: principle and conditions for success

The OPH of Lunéville-Baccarat is therefore committing itself to the only path that works: a coordinated shock treatment, carried out simultaneously on the two entire buildings — the 72 flats, the common areas (cellars, halls, bin rooms, service ducts, lifts) and the immediate exterior. Here is the protocol, modelled on the methods that ProDeratisation deploys in the Paris region and that the Certibiocide / CS3D frameworks govern.

Step 1 — Temporary rehousing (day D)

All occupants are rehoused for a full day in a municipal gymnasium made available by the town hall (in Lunéville, several gymnasiums are available near the Hercule and Dragon buildings). The rehousing is done in agreement with the town hall and the prefecture of Meurthe-et-Moselle (prefect's office, cohesion service). Vulnerable occupants (elderly people, people with reduced mobility, very young children) are identified in advance and rehoused according to suitable arrangements (hotel or medico-social facility if necessary).

Step 2 — Preparation of the flats (D-7 to D-1)

Each tenant must, one week before the intervention:

• Take out the appliances from the kitchens: fridge, oven, hobs, dishwasher, washing machine.
• Empty the cupboards of dishes and foodstuffs (everything must be stored in hermetic containers or thrown away).
• Remove the skirting boards if possible, and clear the back of heavy furniture (cookers, built-in units).
• Put infested textiles in sealed bin bags (sheets, curtains, clothes in contact with the floor), taken to a wash at 60 °C minimum or professional dry cleaning.

The OPH commissions a preparation team (cleaning company + OPH agents) for tenants who cannot prepare their flat themselves — elderly, disabled, etc.

Step 3 — Simultaneous treatment of the 72 flats + common areas (day D)

The intervention takes place in a single day, by several teams working in parallel (5 to 8 pairs depending on the configuration). Three combined techniques:

1. Professional chemical treatment: application of cascade gel baits (hydramethylnon, fipronil or indoxacarb depending on the populations and resistances observed) in hot spots (behind appliances, skirting boards, ducts, traps), combined with targeted spraying of circulation areas (under sink, behind machines, around door frames).
2. Thermal treatment: dry steam at 180 °C on critical points (machine seals, skirting boards, cracks), or homogeneous heat 55-60 °C for 6 hours in closed volumes.
3. Appliance treatment: dismantling, vacuuming and steam treatment of each appliance, or controlled waste disposal for irreversibly infested appliances (with replacement by the OPH).

The common areas (halls, staircases, bin rooms, garbage chutes, cellars, service ducts) are treated at the same time by a dedicated team. Without this, reinfestation is guaranteed in less than 30 days.

Step 4 — Second pass at D+15 (mandatory)

Cockroach eggs are insensitive to most insecticides and to steam. A full second pass, 15 days after the first, is non-negotiable: it targets the next generation, which will have hatched in the meantime. Without this second pass, the operation is statistically doomed to failure.

Step 5 — Follow-up at 3 months and 6 months

The OPH commissions a control visit at D+90 and D+180 in each flat, with installation of sticky detection traps: any triggering requires an immediate targeted treatment. For the Hercule and Dragon buildings, an annual prevention contract is recommended (3 to 4 passes per year, average cost €0.80 to €1.20 per flat per month), similar to what is already practised in some Paris-region housing estates.

The cost and timetable of the shock treatment in Lunéville

The OPH has not yet communicated precise figures, but the 2026 orders of magnitude for this type of operation in collective housing are well known:

• Preparation + simultaneous treatment of the 72 flats + common areas: between €25,000 and €45,000 excluding tax (i.e. €350 to €625 per flat).
• Second pass at D+15: around €8,000 to €12,000 excluding tax.
• Replacement of appliances sent to waste: between €1,500 and €3,000 per flat concerned, i.e. a potential extra cost of €30,000 to €60,000 if the majority of appliances are affected.
• Total cost of the operation (excluding rehousing and replacement): €35,000 to €60,000 excluding tax for the two buildings.

Temporary rehousing in the gymnasium is a marginal cost, mainly logistical (free provision by the town hall, food taken care of by the CCAS). The most optimistic scenario identified by the OPH is an intervention in autumn 2026, after an information and acceptance campaign with the 72 households — the cooperation of everyone being the absolute condition for success.

To put these figures in perspective: the cost of non-intervention over two years is the accelerated deterioration of the building (insulation, furniture, appliances), the exodus of solvent tenants, the legal liability of the landlord (see below), and ultimately the insalubrity indemnity that the prefecture can impose. A €50,000 operation is always less costly than an administrative and judicial procedure that rarely exceeds €200,000 in cumulative costs for a building of this size.

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What does the law say? The landlord's liability

French law is, on this point, aligned with what applies to bed bugs: the landlord is liable as soon as they are informed and do not act diligently. The key texts:

Article 6 of the Law of 6 July 1989 (amended by the ELAN Law of 2018)

"The landlord is required to provide the tenant with a decent dwelling, not showing any obvious risks that could harm physical safety or health, free of any infestation by harmful or parasitic species".

French case law has long considered that cockroaches are covered by this obligation (Cass. civ. 3rd, 16 December 1998, no. 97-13.248; confirmed since by numerous court of appeal rulings). In Lunéville, the OPH of Lunéville-Baccarat is therefore legally bound to act.

Article 1719 of the Civil Code

"The landlord is obliged, by the nature of the contract, and without the need for any particular stipulation, to allow the tenant to enjoy the premises peacefully for the duration of the lease".

The impossibility of inviting people over, the social isolation described by Cathy, the obligation to sleep with the light on, the repeated replacement of appliances: all these elements constituting a loss of enjoyment entitle the tenant to compensation (typically €1,500 to €4,000 per affected tenant, depending on the duration and intensity).

Article 6 of Decree No. 87-713

Disinsection (anti-cockroach, anti-bedbug) is NOT a recoverable charge from the tenant. The cost of the treatment is entirely at the landlord's expense, including the successive passes, appliance replacement and temporary rehousing.

Articles 119 and 121 of the Departmental Health Regulation (RSD) of Meurthe-et-Moselle

The prefect may, on a report from ARS Grand Est or an association like Si Toit Lien, put the landlord on formal notice and order a treatment enforced at the landlord's expense if voluntary action is not taken within a reasonable time.

For Lunéville tenants who wish to assert their rights, see our complete guide on the legal obligations of deratisation and disinsection in co-ownership and HLM.

Prevention: avoiding the Lunéville scenario this summer

For a tenant, owner or landlord who wants to avoid the situation of Hercule and Dragon, seven preventive measures to put in place before the end of the summer:

1. Monthly visual inspection of hot zones: behind the fridge, under the sink, washing machine seals, kitchen skirting boards, traps. A single cockroach visible in daytime = infestation already established.
2. Hermetic food storage: any open foodstuff (bread, pasta, cereals, biscuits) must be stored in a hermetic container. Cockroaches need one gram of food per day, anywhere and everywhere.
3. No stagnant water: immediately repair dripping taps, leaking traps, porous washing machine seals. Cockroaches can survive 2 weeks without food, but only 1 week without water.
4. Seal entry points: expanding foam on pipe passages, sealing of skirting boards, stainless steel mesh 1 mm on low vents. An adult German cockroach fits through a 3 mm gap.
5. Sticky detection traps: place 4 to 6 sticky traps (glue boxes) in each flat, one per hot zone. Detects the infestation 6 to 8 weeks before it becomes visible.
6. Annual prevention contract for buildings of more than 20 flats: 3 to 4 passes per year, installation of preventive gel baits, €0.80 to €1.50 per flat per month. This is the investment the Lunéville OPH should have made 18 months ago.
7. Occupant awareness: annual information meeting, signage in the halls, alert number. Without the cooperation of all occupants, no collective treatment can succeed — this is exactly what Maxime Fresse says, and he is right.

To go further, you can read our complete file on cockroaches in senior residences in Paris, our analysis of the growing resistance of cockroaches to commercial insecticides, and our guide on how to get rid of cockroaches for good.

In summary

The case of the Hercule and Dragon buildings on rue Florent Schmitt in Lunéville illustrates, after Roissy-en-Brie, that the pest crisis in collective housing is now structural in France. Five truths to remember:

• ✅ Flat-by-flat treatment no longer works beyond a certain infestation threshold: a coordinated treatment is needed across the entire building + common areas.
• ✅ Cooperation of all occupants is non-negotiable: a single untreated flat is a reservoir that re-infests neighbours in less than three weeks.
• ✅ The landlord is legally liable: Law of 6 July 1989 (art. 6), Civil Code (art. 1719), Decree No. 87-713. The cost of the treatment is not recoverable from the tenant.
• ✅ Appliances are an underestimated reservoir: a shock treatment integrates dismantling, steam treatment or controlled waste disposal of each appliance.
• ✅ Minimum two passes (D and D+15) are mandatory to eliminate the next generation from the eggs.

ProDeratisation operates 7 days a week in the Paris region and, through a national network, across the whole of France for the diagnosis, shock treatment and legal support of social landlords, co-ownerships, residences and hotels. If you are facing a cockroach infestation in a collective building, contact us immediately: free diagnosis within 24 hours, coordinated building quote within 48 hours, intervention in partnership with your town hall for temporary rehousing.

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