Housing corporations and other larger rental organisations often use a complaints procedure. You are expected to go through this complaints procedure first and to see whether you can reach a solution together with your landlord. Check, for example, the complaints procedure of the
Do you rent from a housing association? Then you can contact the regional complaints committee. This is an independent committee that handles your complaint. Read on the website which complaints they handle and how you can submit them.
In Leiden you can contact the rent assessment commission (Dutch:
If you need (free) advice or more information before taking action, you can also contact the legal desk (Dutch: