You signed the lease three months ago. The room looked good, the neighbourhood worked, and you didn't stop to compare the price with anything beyond your own budget. Now a friend tells you they pay €150 less for a similar room two streets away.
How do you know if your rent is reasonable, or if you're overpaying?
Since 1 May 2025, Brussels has an objective answer to that question. Article 224/1 of the Brussels Housing Code establishes that a rent is presumed excessive if it exceeds the official reference rent by more than 20%. And the tool that calculates that reference is free, public, and takes under three minutes to use.
This article explains how the reference rent grid works, how to apply it to your room or shared flat, and what to do if you discover you're paying an excessive rent.
The reference rent grid is a digital tool developed by the Brussels-Capital Region that estimates the reference rent for any property based on objective criteria: floor area, number of bedrooms, year of construction, condition of installations, and features such as double glazing, a fitted kitchen, or central heating.
It has existed as a simple indicative reference since 2017. Since December 2021, the law has required every residential lease signed in Brussels to state the reference rent for the dwelling, alongside the actual rent charged. But until 2025, that reference carried no direct legal consequence — it was informational only.
That changed on 1 May 2025. The Parliament of the Brussels-Capital Region adopted an ordinance turning the reference rent grid into a tool with real legal weight. From that date, any rent exceeding the reference price by more than 20% is presumed excessive — and the burden of proof shifts to the landlord, not the tenant.
The tool is freely accessible at loyers.brussels.
The process is simple. At loyers.brussels, you enter the property's address, living area, number of bedrooms, year of construction, and tick the available features: lift, terrace, double glazing, fitted kitchen, washing machine connection.
The simulator returns a reference rent range: minimum, average, and maximum, calculated for that exact property profile.
Here's the important nuance for anyone searching for a room in a shared flat in Brussels: the reference rent grid is calculated for the whole property, not for an individual room. If you rent a room within a shared flat, the correct calculation is proportional — divide the reference rent of the whole flat by the number of bedrooms, adjusting for relative room size if there are significant differences.
Imagine you share a three-bedroom flat in Ixelles. The simulator returns a reference rent of €1,650 for the whole flat. If the three rooms are similar in size, the reference rent per room is roughly €550. If you're paying €780 for your room, you're 42% above the reference — clearly within the threshold for presumed excess.
Having the number is the first step. Acting on it has several stages.
First, verify the calculation is accurate. Re-enter the data at loyers.brussels carefully — the year of construction and the condition of installations significantly affect the result. An error here can inflate or deflate the reference rent unfairly.
Second, request a review. If the rent exceeds the reference by more than 20% without exceptional quality features that justify it, you can request a formal review. For leases longer than one year, this request can only be made from the third month of the contract onwards.
Third, escalate to the Joint Rental Committee. If the landlord doesn't agree to review the rent after your request, you can take the case to the Commission Paritaire Locative (Joint Rental Committee), an independent body that mediates rent price disputes in Brussels. The procedure is free.
The landlord can justify a rent above the 20% threshold if they demonstrate specific quality features of the property or its surroundings — but that justification is on them, not on you.
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The reference rent grid isn't only a protection tool for tenants. For a landlord renting rooms with real conditions and fair prices, the regulation has a positive side effect: it reduces unfair competition from those inflating prices without justification, and provides legal certainty over what rent is defensible in case of dispute.
A landlord who prices within the reference range — or who has documented the features that justify a higher price, such as recent double glazing, a renovated kitchen, or exceptional transport links — enters any negotiation or dispute from a solid position.
What we observe at Roomie-Radar is that landlords who list rooms with prices aligned to the official reference build immediate trust with candidates. A tenant who has checked the figure at loyers.brussels before reaching out responds positively to a landlord whose price already falls within that range.
One nuance worth knowing: the data underlying the current reference rent grid comes from the 2017–2020 period. The Brussels-Capital Region has planned an update for 2026, specifically to improve the tool's representativeness and reliability with more recent market data.
This has two practical implications. First, the current reference ranges may not fully reflect recent market evolution in neighbourhoods where prices have risen significantly. Second, it's worth re-running the calculation once the update is published, as the reference range for your property may change.
The Brussels reference rent grid is one of the most useful and least-known tools for anyone searching for, or already renting, a room in a shared flat in Brussels. It's free, official, and turns a suspicion — "I think I'm overpaying" — into a number with legal weight.
It doesn't solve Brussels' deeper affordability problem. But it changes the terms of the conversation.
Roomie-Radar connects tenants with verified listings in Brussels at transparent prices from the first contact. Start at roomie-radar.com. Using Roomie-Radar is free.
1. What is the Brussels reference rent grid?
It's a free official tool from the Brussels-Capital Region, available at loyers.brussels, that calculates a reference rent for any property based on objective criteria: floor area, number of bedrooms, year of construction, and quality features. Since 1 May 2025, a rent exceeding that reference by more than 20% is legally presumed excessive.
2. How do I apply the reference rent grid to a room in a shared flat?
The tool calculates the reference rent for the whole property. For an individual room, divide that reference rent by the number of bedrooms, adjusting proportionally if there are significant size differences between rooms. Compare that figure to what you're actually paying for your room.
3. What happens if my rent exceeds the reference price by more than 20%?
The law presumes your rent is excessive. You can request a formal review from your landlord. If no agreement is reached, you can take the case to the Commission Paritaire Locative, an independent and free body that mediates rent price disputes in the Brussels-Capital Region.
4. Can a landlord justify a rent above the 20% threshold?
Yes. If the property has specific quality features — of the dwelling itself or its surroundings — that objectively justify a higher price, the landlord can demonstrate this. The burden of proof lies with the landlord, not the tenant.
5. Since when has it been mandatory to include the reference rent in Brussels lease contracts?
Since December 2021, every residential lease signed in the Brussels-Capital Region must state the reference rent for the dwelling, alongside the actual agreed rent. This obligation predates the legal 20% cap, which came into force in May 2025.
6. Can I request a rent review at any point during the lease?
For leases longer than one year, the review request can only be submitted from the third month of the contract onwards. This gives both parties time to confirm the actual condition of the dwelling before initiating any formal price dispute.
7. Will the reference rent grid be updated in 2026?
Yes. The tool's current data comes from the 2017–2020 period. The Brussels-Capital Region has planned an update to improve data representativeness with more recent rental market information.
8. Is loyers.brussels free to use?
Yes, completely free and with no registration required. You only need to enter the address and characteristics of the property to get a reference rent range.
9. Does this regulation apply to co-living rooms in Brussels too?
The Article 224/1 regulation applies to residential rental contracts in general. Co-living spaces operating under service-based models with contracts different from standard residential leases may fall under different frameworks. If you're unsure about your specific situation, official information is available at be.brussels.
10. Does Roomie-Radar account for the reference rent grid in its Brussels listings?
Roomie-Radar does not calculate or verify the reference rent for each listing published on the platform — that check is the tenant's responsibility via loyers.brussels. What the platform does offer is verified listings with transparent information from the first contact, which makes it easier for tenants to run that check before committing. Using Roomie-Radar is free.
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