The question of whether an employer can impose a change in working hours raises essential concerns for many employees. The modification of hours can have a significant impact on the personal and family life of employees. The conditions under which these changes can be made are often surrounded by legal complexity. Let us explore together the rights and obligations of both parties to understand the powers of the management and the possible remedies for employees.
Under what conditions can an employer modify working hours?

An employer has the possibility to unilaterally modify working hours, but this depends on the terms of the contract. If the hours are explicitly mentioned in the contract, the employee‘s agreement is necessary for any modification. Otherwise, the employer can proceed with the change without obtaining the employee‘s prior agreement.
For part-time employees, the rules may be slightly different. If the contract provides for possible changes in hours, the employer has the power to apply these modifications. However, if the hours are fixed by the contract, the employee‘s agreement remains essential.
In case of refusal of a modification by the employee, the employer must respect a notice period of 7 working days, unless otherwise provided. If this period is not respected, the employee can refuse the change without committing any fault.
What are the employee’s rights when faced with a change in working hours?
The rights of employees are protected by French law, which states that any substantial modification requires the employee‘s agreement. A change from day to night hours or a reduction in working time are considered substantial modifications.
Employees have the right to refuse an unjustified modification without risking dismissal for insubordination. The modifications must be justified by the interest of the company and must not excessively infringe on the employee‘s rights, especially regarding their personal and family life.
In case of persistent disagreement, the employee can turn to the Social and Economic Committee (CSE), or even bring the matter before the labor courts (prud’hommes) to assert their rights. Moral harassment or any excessive pressure to accept a change can also be reported.
What remedies exist in case of non-compliance with notice periods?

Respecting the notice period is a legal obligation for the employer. If this period of 7 working days is not respected, the employee can refuse the modification without it being considered a fault.
In case of non-compliance with legal obligations by the employer, the employee has the right to bring the matter before the labor courts (prud’hommes) to obtain compensation. This remedy helps protect the rights of employees against abusive practices.
It is also possible to seek advice from services such as Allo Service Public or France Travail to obtain precise and tailored information for each situation. The health and rest of the employee must be preserved, and any new distribution of hours must respect these fundamental principles.
It is also relevant to examine the legal and organizational nuances related to changes in working hours.
- Contractual clause: Working hours are often defined by a specific clause in the contract, and any modification must respect this mention to be valid.
- Obligation of loyalty: The employer and employee must execute the employment contract in good faith, which implies transparent communication and respect for mutual obligations.
- Protection of personal life: Changes in hours must take into account the personal and family constraints of employees, so as not to harm their daily balance.
Can an employee refuse a change in working hours?
Faced with a modification of working hours, an employee has the right to refuse if this change is considered substantial. This includes significant modifications such as switching from day work to night work. The refusal is legitimate if the initial working conditions are changed without prior agreement. In this case, the employee cannot be sanctioned for insubordination. It is essential to verify whether the employer has respected the legal obligations such as the notice period and whether the change is justified by the interest of the company.
If an employer persists in their change despite the employee‘s refusal, remedies are possible. The employee can bring the matter before the labor courts (prud’hommes) to assert their rights. In case of excessive pressure, this may be considered moral harassment. It is advisable to keep written records of all communications and to seek the help of the CSE or a legal advisor to assess the situation.
Impact on personal and family life
A change in hours can have a significant impact on the personal and family life of an employee. Working hours influence daily organization, especially for those with family responsibilities. Childcare, extracurricular activities, and rest can be disrupted by a new distribution of hours. It is therefore crucial to assess the potential impact before accepting a change.
Differences between minor and substantial modifications
It is fundamental to distinguish between a minor modification and a substantial modification. Minor modifications, such as adjustments of one hour, can often be made without prior agreement. In contrast, substantial modifications, which deeply alter the working conditions, require the employee‘s agreement. This distinction is essential to understand the rights and obligations of each party.
Role of the employment contract
The employment contract plays a determining role in managing modifications to working hours. If the hours are specifically mentioned, any modification requires mutual agreement. In the absence of details, the employer has greater latitude to adjust the hours. It is therefore essential to fully understand the terms of the contract before making a decision.
Remedies in case of moral harassment
If an employer exerts excessive pressure to accept a change in hours, this may be considered moral harassment. The employee can then turn to the labor courts (prud’hommes) to assert their rights. It is important to document all interactions and seek the help of a legal advisor to assess the situation. Moral harassment is a serious violation of the employee‘s rights and must be dealt with rigorously.
How to protect your rights against an employer?

To protect their rights against an employer, an employee must be informed and vigilant. Knowing the legal obligations and the conditions of the employment contract is essential. In case of modification of hours, it is crucial to verify if the change is justified and if the notice period has been respected. In case of disagreement, the employee can bring the matter before the labor courts (prud’hommes) to defend their rights. Support from the CSE and legal advisors can also be valuable to navigate these complex situations. Preserving personal and family life must remain a priority, as well as respecting the principles of health and rest.
FAQ: Change of Working Hours
What to do if an employer changes my hours without notice?
If an employer changes your hours without respecting the notice period, it is crucial to report it. You have the right to refuse this non-compliant modification without risking sanctions. Document your action and, if necessary, seek help from the labor courts (prud’hommes) to defend your rights.
How to react to pressure to accept a change in hours?
Faced with excessive pressure to accept a change in hours, it is important to keep written records of all communications. Consulting a legal advisor can help you assess the situation. Excessive pressure may be considered moral harassment, and recourse to the labor courts (prud’hommes) can then be envisaged.



