The legal starting point
Rent indexation uses a formula based on Statbel’s health index. Signature and commencement dates play different roles. Regional conditions, registration and energy performance may introduce restrictions or correction factors. A poor energy rating does not automatically mean indexation is currently forbidden.
Documents to gather
The lease and amendments, signature and starting dates, inventory, dated photographs and correspondence. Identify the property’s region.
Your next step
Write a short timeline and state the outcome you seek. Request a written explanation if an amount or decision seems wrong. Before signing, acknowledging a debt or allowing a deadline to pass, check the consequences for your circumstances. An amicable step does not automatically suspend a statutory deadline.
Frequently asked questions
Is a guide enough to decide?
It helps prepare your next step. Dates, documents and specific rules can change the answer. Consult the sources below and have decisive issues assessed.
Sources and useful texts
Sources consulted on 27 September 2026
General information about Belgian law. Region, date of events and your circumstances can change the applicable rule.
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