The hourly wage for domestic help (incl. social security contributions) in Switzerland is between CHF 23.- and 33.-, with regional differences. The domestic helpers on Homeservice24 determine their hourly wage themselves based on their experience and qualifications - and they state this in their profile. Basically, however, the wage is a matter of negotiation between you and your domestic help.
You can find more information about wages here: How much does domestic help cost?
