Rolling WWS Maximum in Delft: Cumulative Effects Over Multiple Years

In Delft, the WWS maximum (Woondienstverlening, Woonruimte en Servicekosten – Housing Services, Living Space, and Service Costs) does not apply in isolation per year but rolls over cumulatively across multiple periods, particularly in the busy rental market around TU Delft and the city center. Landlords in Delft may not skip the maximum in one year to later impose a double 'catch-up' increase, in accordance with Article 7:901 of the Dutch Civil Code (Burgerlijk Wetboek, BW). The total increase over several years—for example, 2% in 2023 and 3.4% in 2024—must never exceed the compounded maximum of approximately 5.5%. If a new rent increase in your Delft residence exceeds this limit, you may file an objection with the landlord or the Rent Tribunal (Huurcommissie). The Netherlands Enterprise Agency (RVO) calculates this using the rent index formula, while the Rent Tribunal’s tool is particularly useful for the liberalized sector in neighborhoods such as Poptahof or Binnenwatersloot. For housing associations like Vestia or Trivire in Delft, the DAB limit (Dynamisch AanpassingsBesluit – Dynamic Adjustment Decree) also applies. In Delft, tenants often encounter 'catch-up' increases due to high student demand; these are invalid without judicial review by the District Court of The Hague. Always demand detailed transparency in rent increase calculations. In case of an exceedance, you may claim retroactive rent reduction and potential compensation for creeping price inflation. Maintain an accurate rental history, compare annually with Delft’s market developments, and consult the local Delft Tenants’ Association (Huurteam Delft) for free advice. This way, you protect yourself as a long-term tenant in this popular student city.