Rent calculators
Index a Brussels rent, with the PEB factor where it applies.
Brussels runs the Belgian health index formula and then multiplies by a PEB correction factor on leases that took effect before 14 October 2022. It also stops the increase outright where no valid PEB was given to the tenant.
Letting law is written below the country here, so the rules differ inside it.
Belgium indexes the rent the lease states, excluding charges, never last year's indexed figure. Leave it empty to use the rent above.
It fixes the anniversary, and where an index applies, the starting index.
The anniversary you are claiming.
A poor rating blocks or dampens the rise in some places
Brussels stops the revision outright without one.
The index for Aug 2023, the month before the lease start you gave. The lease should state it, with its base year.
The index for Aug 2026, the month before the anniversary, on the same base year.
Type the two index figures and the answer appears here. Dardaris holds no copy of the series, so it works from the figures you enter and shows them in the working.
What governs in Belgium, Brussels-Capital
- Index
- Indice santé (health index), base 2013 = 100
- Formula
- new rent = original base rent × health index of the month before the anniversary ÷ health index of the month before signature × the PEB correction factor, where one applies
Nothing is stored and nothing is sent. This runs the same calculation engine the product itself runs, in this browser.
What the rules actually say
The rules Dardaris applies in Brussels.
Every line below is read off the same jurisdiction pack the product runs on, and each one says whether anybody has confirmed it in a source.
- Index
Indice santé (health index), base 2013 = 100
Confirmed in Statbel
- Formula
new rent = original base rent × health index of the month before the anniversary ÷ health index of the month before signature × the PEB correction factor, where one applies
The base rent is the original rent excluding charges stated in the lease, never last year's indexed figure.
Confirmed in a primary source
- Notice
A written demand is required
A written demand is required. The date of that demand is what starts the retroactivity clock, so keep it.
Confirmed in a primary source
- Back claim
3 months can be back claimed
Recoverable only for the three months preceding the month your demand is sent.
Confirmed in a primary source
The questions that follow.
- How is rent indexation calculated in Brussels?
- The new rent is the original base rent excluding charges, multiplied by the health index of the month before the anniversary, divided by the health index of the month before signature, and then multiplied by the PEB correction factor where one applies.
- What is the PEB correction factor?
- A permanent multiplier, roughly 0.89 to 0.99 depending on the anniversary month and the PEB class, that dampens indexation on dwellings rated E, F or G whose lease took effect before 14 October 2022.
- Can I index without a PEB certificate?
- No. Brussels blocks indexation entirely where the tenant has not been given a valid PEB, and the certificate has to be valid at the moment you index.
The same calculator, under other law.
A rent rises differently in each of these, and the page for each one says how. Anywhere else, the calculator still runs on that jurisdiction's own pack.
The calculation takes a minute. The date is what costs you.
Nobody forfeits a year because the arithmetic defeated them. They forfeit it because the anniversary fell in a quiet month, the index was not out yet, and by the time it was, there was nothing to remind them.
- It watches the anniversary for youDardaris holds the lease, its reference quarter and its anniversary, and tells you a revision is due rather than waiting to be asked.
- And works it out on the right two figuresThe reference quarter the lease names, against the same quarter a year earlier, applied to the rent in payment. The DPE block and the twelve month window are part of the same answer.
- But it does not send itA letter that raises somebody's rent waits for you. Dardaris prepares it and says what it is based on, and you are the one who decides it goes.
The number is the easy part.
Dardaris keeps the lease, raises the invoice, matches the payment and writes down what it did. Bring one building and watch a month before you decide anything.
14 days before the first charge · Nothing is switched on until you say so