Night Work in France: Prepare the Assignment Before Mobilising Your Team

Your customer has offered an overnight production-shutdown window. The technicians are booked, travel is arranged and the plant expects the line back by morning. That operational slot does not, by itself, allow a foreign contractor to assign its employees to night work in France.

The employer must first identify the collective rules that apply to its own workers, establish why night work is necessary, check whether the planned pattern makes any employee a legally defined night worker, and organise the required rest and health safeguards. If no usable collective agreement authorises the arrangement, an application to the French labour inspector may be required before the team is assigned to night posts. Filing a SIPSI posting declaration does not replace that analysis or grant permission for the hours declared.

This guide concerns adult employees in the private sector, including employees posted to France by a foreign employer. Transport, agriculture, minors and occupations with special working-time regimes require a separate review.

First classify the hours, then classify each worker

French law separates two questions that project schedules often merge: is work being performed during the legally defined night period, and does the employee meet the definition of a night worker? The distinction affects the route for introducing night work and the individual safeguards and limits that must be built into the roster.

What counts as the night period?

A collective agreement may define a night period of at least nine consecutive hours. It must include midnight to 5:00 a.m., start no earlier than 9:00 p.m. and finish no later than 7:00 a.m. In the absence of a collective definition, work performed between 9:00 p.m. and 6:00 a.m. is night work. Certain press, broadcasting, film, live-performance and nightclub activities have specific rules, including a default midnight-to-7:00 a.m. period. See French Labour Code Article L3122-2, Article L3122-3 and Article L3122-20.

This means a 10:00 p.m. to 2:00 a.m. maintenance task contains night work even if the employee does not yet qualify as a night worker. The employer still needs to examine the lawful basis and terms governing those hours.

When does an employee become a night worker?

An employee is a night worker if, under the employee’s usual schedule, they perform at least three hours of night work on at least two occasions per week. An employee can also acquire that status by reaching the minimum number of night hours over the applicable reference period. An extended branch agreement may set that second threshold and reference period; in the absence of such a provision, the default is at least 270 night hours over 12 consecutive months. These are alternative tests. An employee who meets the regular three-hours/twice-a-week test need not first reach 270 hours. See Article L3122-5, Article L3122-16 and Article L3122-23.

For a short shutdown, classify each employee against both tests using the normal roster and relevant history. Do not assume that a brief French assignment prevents night-worker status: an employee’s usual schedule or hours already accumulated in the reference period may be decisive.

Night work must answer a continuity need

Article L3122-1 states that recourse to night work is exceptional. It must account for worker health and safety and be justified by the need to ensure continuity of economic activity or services of social utility. This is a substantive test, not a sentence to copy into a project plan. The employer should be able to connect the proposed hours to an actual operating constraint. See Article L3122-1.

A production shutdown may support that case where equipment can only be isolated outside operating hours, where daytime intervention would interrupt a continuous process, or where a tightly sequenced restart requires work across the night. Customer convenience, a cheaper hotel plan or a desire to compress travel will usually be a weaker explanation. The evidence should describe why a daytime or staggered alternative does not meet the continuity requirement and what was done to reduce night exposure.

Check whether an applicable agreement already creates the route

An enterprise or establishment agreement, or failing that a branch agreement, may introduce night work or extend it to new employee categories. Under Article L3122-15, the agreement must address the justification for night work, the night period, compensatory rest and any pay compensation, improved working conditions, work-life and transport measures, professional equality and access to training, and the organisation of breaks. Reading only a premium table or a definition clause is therefore insufficient. See Article L3122-15.

For posted workers, applicability needs particular care. The French Ministry of Labour explains that the reference branch is identified from the activity actually performed in France and that, for core employment matters, extended branch provisions may apply to posted employees. A customer site’s enterprise agreement does not automatically extend to an independent foreign contractor merely because the work takes place there. Posted temporary-agency workers are a distinct case: they generally receive the working-time and night-work collective rules applicable in the user undertaking. See the Ministry’s guidance on collective agreements for posted workers.

Before mobilising, record the French activity, the applicable collective agreement and its extension status, the employer covered by it, the employee categories concerned, and the clauses that actually establish the proposed night arrangement. If that chain cannot be demonstrated, treat the collective basis as unresolved.

No agreement does not mean automatic permission

Where the analysis finds no collective agreement providing the route and the proposed organisation requires authorisation, employees may be assigned to night posts only with authorisation from the labour inspector, provided the employer has first conducted serious and loyal negotiations aimed at concluding an agreement. The organisation and its route still need to be qualified even if not every employee reaches the individual night-worker thresholds; a short assignment is not a safe harbour. Article L3122-21 identifies the practical markers: representative trade unions must be invited, given a place and timetable for meetings and the information needed to negotiate knowledgeably, and the employer must answer their proposals. See Article L3122-21.

The application under Article R3122-9 must give detailed reasons showing:

• the constraints inherent in the activity or business operation that make night work necessary for continuity;
• serious and loyal negotiations during the maximum 12-month period preceding the application;
• the proposed compensatory arrangements and breaks; and
• how worker health and safety are protected.

The opinions of the trade-union representatives and the Social and Economic Committee (CSE) must accompany the application. If the employer has neither trade-union representative nor CSE, it supplies a document proving that employees were informed beforehand. Article R3122-9 provides a 30-day decision period from receipt of the application, and the official silence-means-approval catalogue lists implicit acceptance after 30 days for this procedure. This does not guarantee that the substantive conditions are met or include the time needed to identify the correct route, negotiate, consult or complete the file. The employer should verify the applicable decision and procedural conditions before launch rather than require or assume an express written decision in every case. See Article R3122-9 and the official silence-means-approval record.

For a foreign employer with no French employee-representation structure, the absence of representatives does not remove the process. The evidence of prior employee information becomes material, and the employer must still address the other statutory elements. The exact consultation and negotiation route should be validated against the employer’s situation before dates are promised to the customer.

Build health, rest and working-time limits into the roster

Night workers are entitled to compensatory rest for their night periods and, where the applicable text provides it, pay compensation. Under the general regime covered here, compensatory rest is mandatory; a night premium alone does not replace it. The applicable agreement determines the actual entitlement and operating rules. See Article L3122-8.

A night worker must receive the required health follow-up before assignment to the post, followed by regular individual monitoring. Article R4624-18 provides for a pre-assignment information and prevention visit. For an employer established in the EU, EEA or Switzerland, Article R1262-10 recognises equivalent medical monitoring in the home country when the employer can prove that equivalence. The employer should resolve and document the applicable route before the first night shift. See Article R4624-18, Article L3122-11 and Article R1262-10.

The daily effective working time of a night worker is generally limited to eight hours. A separate collective or administrative route may permit a departure in defined circumstances; introducing night work does not itself authorise longer nights. The weekly limit is generally 40 hours averaged over 12 consecutive weeks. An agreement justified by the characteristics of the sector may raise this to no more than 44 hours over 12 weeks. The 46-hour figure found in the general working-time regime must not be transplanted into this night-worker calculation. See Article L3122-6, Article L3122-7 and Article L3122-18.

Count all effective working time in the night worker’s day and week, not only the hours falling inside the night period. Travel that legally constitutes working time, handovers, safety briefings, commissioning and paperwork may change the result. Check in parallel the general limits and rest rules: normally at least 11 consecutive hours of daily rest, at least 35 consecutive hours of weekly rest, and no more than six days of work in a week. Any proposed derogation needs its own legal basis. Night work also does not authorise Sunday work; if the schedule crosses into Sunday, analyse the Sunday route separately. The Ministry summarises these rules in its guidance on posted employees’ rights.

A practical shutdown example

Assume a foreign machinery supplier plans six technicians at a French plant from 10:00 p.m. to 6:00 a.m. for four nights. This example is illustrative; it does not establish that any particular agreement or authorisation applies.

The employer first identifies the activity actually performed and checks the relevant extended branch agreement and any agreement that binds the employer. It then tests each technician’s usual roster and night-hour history over the applicable collective reference period or, by default, 12 consecutive months. The eight scheduled hours may fit the ordinary daily cap for a night worker, but a 9:00 p.m. safety induction, a late handover or work after 6:00 a.m. could create a separate daily-limit issue. The employer also models the 12-week average and daily and weekly rest around travel and other assignments.

If no applicable agreement establishes night work, the launch plan must allow for the negotiation, consultation and labour-inspector route. A commercially safer schedule may use two relays, assign daytime preparation and documentation to another team, move those tasks to another day compatible with rest and working-time limits, or reserve a second shutdown window. These alternatives should be designed before the supplier promises a single overnight crew or a fixed completion date.

Prepare a file that explains the operation

The useful preparation set will depend on the employer, site and legal route; it is not a universal statutory checklist. A focused file commonly brings together:

• the employer’s identity, signatory authority, site, French customer contact and scope of work;
• the applicable collective texts and the clauses relied on;
• planned start and finish times, breaks, handovers, travel treatment and rest, employee by employee;
• the usual roster, the applicable collective reference period or default 12-month history, and the 12-week history needed for classification and averages;
• technical evidence of the continuity constraint and the daytime or relay alternatives considered;
• the proposed compensatory rest, any pay terms, working-condition measures and occupational-health arrangements; and
• negotiation records, representative opinions or proof of prior employee information, as the applicable route requires.

A SIPSI declaration is a separate posting formality, not an hours authorisation. Likewise, any immigration work authorisation required because of an employee’s nationality or status is a separate question. Completing one process does not validate the others. Official guidance describes SIPSI as the prior posting-declaration service; immigration requirements should be checked for each employee’s status.

Prepare the night shift with ALTALEO

ALTALEO can review the proposed dates, site, activity, employee pattern and collective-text assumptions; help organise the supporting documents; coordinate the French-language follow-up; and translate the result into a workable schedule. The employer remains responsible for its employment obligations, and any administrative decision belongs to the competent authority.

You can contact us with the site, proposed period and intended hours even if the full file is not ready. An early review can reveal whether the practical answer is an applicable agreement, an administrative route or a different staffing pattern.