Pest control intervention report: how to check it properly

The typical file looks like this: an annual rodent control contract signed three years ago, four visits a year, €1,320 excluding VAT, and a folder containing eleven almost identical A4 sheets. Same font, same ticked box, same sentence: "Bait stations checked. No activity observed. Nothing to report." Meanwhile, complaints from residents keep piling up and a ground-floor shopkeeper has found droppings in the stockroom.

The instinctive reaction is to switch contractors. That is often a misdiagnosis: the problem is not always the company, it is the fact that nobody on the client side ever reads the reports. Yet the intervention report is the only item that proves — before a general meeting of owners, an insurer, an inspector from the departmental directorate for the protection of populations (DDPP) or a judge brought in by a tenant — that the building's owners' association or the landlord actually took action.

This article explains what an intervention report must contain, how to extract useful information from it in ten minutes, and which signals betray a job done in a hurry.

Brick residential building seen from below, with two rope-access technicians working on the facade

Why the intervention report is a legal document, not just proof of a visit

What it has to prove

Three sets of rules converge on the same document.

• The departmental sanitary regulations. In the Île-de-France region, they require the owner or the manager to keep buildings free of rodents and to have the necessary rodent control operations carried out. In the event of a complaint, the expected evidence is not the invoice: it is the traceability of the operations.
• Housing fitness standards and rental case law. A tenant claiming loss of quiet enjoyment or a non-compliant dwelling very quickly wins their case when the landlord can only produce invoices with no technical report. Conversely, a series of dated, located, signed reports accompanied by recommendations demonstrates due diligence. This ties in with the issue of access refused by an occupant, where the words "access impossible" in the report become the key piece of the file.
• Biocide regulations. Applying anticoagulant rodenticide products in a professional setting requires an applicator holding the Certibiocide certificate, registration of the product with ANSES, and a record of the quantities used. The report is the natural place for that record.

What it can help you gain

A usable report also directly serves the manager's interests: it turns an opaque cost item into an argument. At a renewal vote, a series of reports showing a drop in bait consumption station by station justifies keeping the contract far better than any sales brochure. This is the same logic already described regarding voting on a rodent control contract at a general meeting.

The ten entries a report must always include

Here is the checklist. A report missing more than three of these lines has no evidential value whatsoever.

The most important line: consumption per station

This is the indicator that distinguishes a report from a receipt. A professional servicing fifteen bait stations in a building must be able to say, for each one, whether the bait has been eaten and in what proportion. Reading the figures over time is very revealing:

• High, steady consumption over several months: the population is not being reduced, or an external food source is sustaining it. The problem lies upstream — bin room, deliberate feeding, poor street cleaning.
• Consumption that falls then suddenly rises again: re-infestation, often linked to building works or a sewerage network. The phenomenon is documented in the article on neighbouring building sites that displace colonies.
• Zero consumption everywhere, right from the first visit: either the building is genuinely rodent-free, or the stations are badly placed, or they are never opened.

In the latter case, a simple cross-check will do: ask a caretaker to put a discreet mark with an indelible marker on the lid of two stations and check after the next visit whether the triangular key has left a trace. An intervention logbook kept by the caretaker, even handwritten, makes it possible to cross-reference the technician's actual attendance dates with those on the reports.

The bait station plan: the document 70% of contracts don't have

Why it is indispensable

A rodent control contract without a numbered bait station plan cannot be monitored. The plan — a simple floor plan of the basement and ground floor with numbered dots — answers three questions: how many stations, where, and why there.

Their positioning follows a precise logic that the client can check without any particular technical expertise. Stations must be placed along walls, in dark areas, close to forced passageways: pipe entries, service ducts, the meter room, bin room airlocks, the foot of refuse chutes, bike stores, loading bays. A station set down in the middle of a clear, well-lit corridor will never be visited by a rat: the brown rat hugs the walls.

The right number of stations

There is no regulatory scale, but there are professional rules of thumb for a residential building in the Paris region:

• Basement and cellars: one station every 10 to 15 linear metres of circulation space, plus one at each utility entry point.
• Bin room / airlock: a minimum of two stations, without exception.
• Courtyards, light wells, surroundings, outdoor technical rooms: one station per identified access point.
• Mice: a much tighter grid, every 3 to 5 metres, as mice move only very short distances.

A 60-unit building with two stations in total is not under a rodent control contract: it is under a visiting contract.

Facade of a red and grey brick residential building with balconies and windows

Station safety and compliance

Anticoagulant rodenticides used in common areas must be placed in secured bait stations, locked, inaccessible to children and pets, and bearing a legible label: product, active substance, antidote, company contact details, date of placement. ANSES and the Ministry for the Ecological Transition regularly point out that loose bait placed behind a bin is both ineffective and an offence.

The report must mention damaged or missing stations and their replacement. A station that disappears three times in a row at the same spot is not theft: it is a badly chosen location, usually in a service passageway cleaned with a hose.

The six signs of a fictitious or sloppy job

A genuine visit to a medium-sized building takes between 45 minutes and 1 hour 30. Here is what gives away a twenty-minute visit.

1. Reports that are strictly identical from one quarter to the next, including in the free-text observations. Copy-pasted comment boxes are the clearest signal of all.
2. No recommendation ever made, or always the same generic sentence. A Paris-region basement always has something worth flagging: a door that doesn't close properly, an unsealed duct, a bag left on the floor.
3. Missing product quantities. A professional applicator knows how many blocks they have placed, because they have to keep their register.
4. Impossible timings. Three buildings visited between 9:05 and 9:50, travel time included.
5. No mention of locked areas. If the technician could not get the key to the bin room or the technical room, that must be stated in black and white. A report that never mentions a refused access when the caretaker was absent is suspicious.
6. No photographs. A dated photo is not a regulatory requirement, but it has become the standard for serious companies — and it can be required in the specifications, as explained in the article on drawing up pest control specifications.

An intervention report is not there to reassure the manager. It is there to describe a building precisely enough for another technician, two years later, to pick up the file without starting from scratch.

Organising checks on the client side: the ten-minute routine

Centralise everything in a sanitary register

Best practice, inherited from professional kitchens, is to keep a pest control register for each site. A ring binder with dividers is enough, but a lever arch file with punched pockets holds up better in a caretaker's room than loose folders. It contains, in this order:

• the contract and its appendices, including the bait station plan;
• the contractor's Certibiocide certificates and professional liability insurance;
• the safety data sheets for the products used;
• the intervention reports filed by date;
• residents' complaints, dated, with the unit or flat number;
• the follow-up given to recommendations (works carried out or refused, and by whom).

That last point is decisive. Many failures cannot be blamed on the contractor: they wrote three times "seal the pipe penetration in the bike store" and nobody had the work done. In that case it is the manager who is at fault, and the register shows it both ways.

Cross-check reports against complaints

Useful reading takes ten minutes per quarter and consists of overlaying two sets of data: the locations where bait consumption is high, and the units from which complaints originate. When the two coincide, the treatment is well positioned and simply needs time. When they diverge — complaints on the 4th floor, zero consumption in the basement — the colony is not where the bait is: you need to look at service ducts, suspended ceilings and soil stacks, and sometimes an internal food source.

A simple record of evidence can also be kept by the caretaker between visits: a wide-beam torch shone along the basement skirting boards reveals, within minutes, the runways — those dark, burnished bands left by rodent fur along the walls.

Works: the part the contract never covers

No annual contract includes sealing the building fabric. Yet without proofing, baiting merely caps the population. The points to address through works, and which a good report pinpoints precisely:

• pipe and duct penetrations, to be sealed with mortar, not with expanding foam alone, which gets gnawed through;
• the bottoms of cellar and technical room doors, with aluminium door bottom seals or metal plates;
• low-level ventilation grilles and basement windows, to be fitted with stainless steel mesh of 6 mm maximum;
• floor drains and non-watertight inspection chambers;
• the bin room, whose management remains the single biggest success factor, as detailed in the article on refuse chutes and bin rooms.

Technician in a white protective coverall carrying a case towards the entrance of a brick building

What to write into the contract to get real reports

Report quality is not obtained by sending chasing letters: it is written into the contract. Four clauses are enough.

1. Mandatory format. The contractor provides one report per visit and per site, containing the ten entries listed above, sent within 72 working hours in PDF format, with the consumption record for each numbered station.
2. Contractual bait station plan. Updated whenever changes are made, appended to the contract, handed over at the end of the contract — this is what makes it possible to change contractors without losing the history.
3. Annual joint inspection. Once a year, the visit takes place in the presence of the caretaker or the manager, with a joint report. This is the most effective deterrent against fictitious visits.
4. Penalties and a partial performance clause. Not "zero rodents", an unachievable target in an urban setting, but a commitment to a measured reduction in evidence levels and to a number of additional visits included should an upsurge be reported.

For mixed-use buildings with a shop or restaurant at street level, the owners' association contract and the operator's contract also need to be coordinated — a subject covered in the article on the allocation of costs with a shop at street level. Two different contractors exchanging no reports means two areas each treated by halves, and a colony moving freely between them.

Three questions to ask before renewing

• "Can you send me the consumption history per station over the last twelve months?" A company that cannot answer within 48 hours is not keeping records.
• "How many stations have you added or moved since the service started?" Zero, over three years, in a building generating complaints, means no analysis has taken place.
• "Which recommendations have not been acted on by the managing agent or the landlord?" A good contractor has the list. And it is often the real explanation for the failure.

The intervention report is the cheapest management tool available for the pest control budget of a building or commercial premises. Properly demanded, it reduces the number of visits needed, documents the manager's due diligence and avoids disputes. Filed away in a folder nobody ever opens, it is not worth the paper it is printed on. To build or take over a monitoring programme on a solid footing, the annual contracts page and the quote request form make it possible to start from a written scope and bait station plan.

Sources and references: departmental sanitary regulations for Île-de-France; ANSES, marketing authorisations for TP14 rodenticide biocidal products; Ministry for the Ecological Transition, Certibiocide scheme; INRS, dossier on biological risks linked to rodents; Chambre syndicale 3D (CS3D), pest control best practice.