You must offer your part‑time staff the same employment conditions as full-time workers, including pay, leave, notice periods and other rights and benefits linked to their employment.
Modifying working arrangements
Whenever possible, you should try to accommodate requests from your employees if they want to change their working schedules, such as:
- transferring from full-time to part-time
- transferring from part-time to full-time
- increasing their working hours
You cannot dismiss an employee if they refuse to transfer from part-time to full-time work or vice versa.”
That’s EU regulation. https://europa.eu/youreurope/business/human-resources/employ...:
“Equal employment conditions
You must offer your part‑time staff the same employment conditions as full-time workers, including pay, leave, notice periods and other rights and benefits linked to their employment.
Modifying working arrangements
Whenever possible, you should try to accommodate requests from your employees if they want to change their working schedules, such as:
- transferring from full-time to part-time
- transferring from part-time to full-time
- increasing their working hours
You cannot dismiss an employee if they refuse to transfer from part-time to full-time work or vice versa.”
(Equal pay, leave, pension, etc. are pro rata)
In the EU, about 1:5 of employees work part time, most of them to their satisfaction (https://ec.europa.eu/eurostat/web/products-eurostat-news/-/D...)