The rent may be increased once every 12 months. A rent increase within 12 months is only allowed if the building has been improved or made more sustainable and with the consent of at least seventy percent of the tenants.
Are you renting from a social housing provider such as a housing corporation or student housing provider? In that case, the national government will determine the maximum percentage of rent increase each year. A social housing provider may not charge more than that maximum. Of course, they are allowed to increase the rent below the maximum increase.
Recently, the Dutch national government has also set a maximum for rent increase in the private sector. The landlord must adhere to this. The maximum rent percentage is higher in the private sector than in the social sector. Sometimes there is a percentage mentioned in your rental contract. The landlord will increase your rent annually with this percentage, called the indexation clause.
You have the right to object to your rent increase. Will your rent increase take effect on 1 July? Then the landlord must let you know what they are planning before 1 May. That way you have time to object. Reasons to object are, for example, that the rent increase follows a previous rent increase within 12 months or that the maximum rental price for the living space has already been reached according to the points system. Read more about objecting on the website of the national government. Het Juridisch Loket has drawn up a letter, which you can use as a sample if you want to object to the rent increase. They also give some tips and trics which you can use to check if you can object to the rent increase.