Rent indexation and EPC in Belgium: What’s changing for shared housing in 2026

Hello everyone, Belgian flatmates and hosts! As of May 2026, the real estate market continues to evolve, and the issue of rent remains at the heart of everyone's concerns. While inflation hit historic peaks in recent years, prompting emergency measures from the government, the situation has now stabilized. However, the rules of the game have definitively changed. At Roomlala, we know that the legislation surrounding renting and shared housing can sometimes feel like a real labyrinth. This is particularly true when it comes to intersecting two hot topics: annual rent indexation and the famous EPC (Energy Performance Certificate) score. Whether you are a student sharing a large apartment in Liège, a young professional in coliving in Brussels, or a host offering rooms in Antwerp, you are directly affected by these regulations. In this ultra-comprehensive article, we will decode for you the impact of the new energy standards on your rent indexation in 2026. The total freeze is over, but be careful: the return to normal is strictly regulated!

Shared housing and rent indexation: the basic rules in 2026

In Belgium, it is essential to remember that shared housing is subject to the standard rules of residential leases. Whether you have signed a single lease with a solidarity clause or individual contracts for each room, the law protects tenants in the same way. Rent indexation is therefore no exception: it is strictly conditioned by the energy quality of the property, represented by the EPC certificate. This document, which has become the cornerstone of the rental market, assesses the energy consumption of your home on a scale ranging from A (very efficient) to G (energy-inefficient).

To fully understand the situation in 2026, we need to take a quick step back. Remember: faced with the energy crisis, the government had introduced a temporary freeze on indexation for the most energy-intensive homes between the end of 2022 and the end of 2023. The goal was clear: to protect the purchasing power of tenants who were already taking the full brunt of the explosion in gas and electricity bills. Today, in 2026, this strict freeze is well and truly over. Indexation is once again authorized for all EPC scores, in all three regions of the country. However, this absolutely does not mean a return to the classic mathematical formula for energy-inefficient properties!

In fact, the legislator has put in place a correction mechanism that remains fully applicable in 2026. Why? Simply to prevent hosts from catching up on the indexation lost during the freeze period all at once. Without this mechanism, a tenant living in a property rated G would have seen their rent skyrocket overnight as soon as the ban was lifted. The law therefore requires smoothing, capping the increase to protect flatmates while allowing landlords to partially track inflation.

Practical usage example: Imagine you are renting a house as a flatmate in Namur with an EPC F rating. Your host cannot simply take the 2022 rent and apply the total inflation accumulated up to 2026. They must use the corrected formula provided by the region, which neutralizes the inflation from the freeze year. At Roomlala, we always encourage hosts to use the official calculators to ensure fair and legal indexation, thus avoiding any conflict with their tenants.

The impact of the EPC score on indexation according to your region

As Belgium is a federal state, housing competence is regionalized. This means that the indexation rules linked to the EPC differ depending on whether your shared housing is in Brussels, Wallonia, or Flanders. At Roomlala, we detail the specificities of each region for this year 2026.

In Brussels: mandatory registration and correction factor

In the Brussels-Capital Region, the rules are particularly strict to protect urban tenants. For homes with a good EPC (A, B, C, or D), indexation is carried out normally at 100%. However, for EPC E, F, and G, a correction factor still applies in 2026. This factor mathematically reduces the authorized percentage of indexation, thus penalizing hosts who have not invested in the energy renovation of their property.

But that is not all! The Brussels region imposes two conditions sine qua non for a host to be able to request indexation. First, the shared housing lease must be registered with the tax office. Second, a valid EPC certificate must have been handed over in person (or via proven electronic means) to the tenants before the indexation request. If one of these two conditions is missing, the indexation is simply illegal and the tenant is entitled to refuse it.

Practical usage example: You are three students in an apartment in Ixelles (EPC F). Your host sends you an email to index the rent. Before paying, you check two things: did you receive the EPC certificate when signing the lease? Is the lease registered on MyMinfin? If the answer is yes, you can check the calculation via the Brussels region's website, which will automatically apply the correction factor for the EPC F. If the lease is not registered, you can kindly remind your host that their request is premature.

In Wallonia: a specific calculation method for energy-inefficient homes

On the Walloon side, the philosophy is similar but the calculation method differs. For homes with an EPC A, B, or C, indexation is total. For homes rated D, E, F, G, or those that simply do not have an EPC certificate, Wallonia has put in place a specific calculation mode. This calculation uses a base rent and a base index adapted to the 2022-2023 period, which de facto cuts part of the inflation to protect tenants from energy-inefficient homes.

It is crucial to note that in Wallonia, the absence of an EPC certificate is heavily sanctioned. Without this precious asset, the host is treated in the same way as the worst energy scores (G) and is subject to the most disadvantageous calculation method. This is a strong incentive for transparency and the renovation of the Walloon building stock, which is often aging.

Practical usage example: You are renting a room in a homestay in Mons. The host announces an indexation based on the classic formula. You ask for the EPC, which they admit they have not had done. In this case, you are entitled to contest their calculation. In Wallonia, without an EPC, they must use the modified formula that will significantly reduce the amount of the increase. It is a fundamental right of the tenant that we strongly defend at Roomlala.

In Flanders: the EPC certificate at the heart of the indexation system

In Flanders, the energy certificate is called the EPC (Energieprestatiecertificaat). The Flemish Region has also adopted a correction factor system to protect its tenants. Homes with an A+, A, B, or C label benefit from full indexation. However, for D, E, F labels, or in the absence of an EPC certificate, a strict correction factor is required when calculating in 2026.

Flanders stands out for its desire to quickly eradicate energy-intensive homes. The Flemish government has even linked indexation to other renovation obligations (the famous renovatieverplichting). Thus, a Flemish host has every interest in insulating their shared housing, not only to be able to index their rent but also to comply with global health standards which are tightening year after year.

Practical usage example: You share a town house in Ghent (E label). The calculation of your new rent will have to include the Flemish correction factor. If the host attempts to apply the classic health index without the correction, the amount requested will be wrong. You can use the Flemish government's rent calculator to show them the exact amount, down to the last euro.

Hosts and tenants: how to apply or verify indexation?

Now that we have clarified the regional rules related to the EPC, it is time to look at the legal procedure. Because yes, rent indexation follows very precise formal rules. A procedural error can render the request void, to the great relief of tenants and the great frustration of hosts. At Roomlala, we rely on education so that both parties can find common ground peacefully.

The strict legal procedure for hosts

The first golden rule, and not the least: indexation is never automatic! Even if the lease includes an annual indexation clause (which is the case in 99% of contracts), the host must imperatively make a written request to their flatmates. This request can only be made on the anniversary date of the lease's entry into force, or after that date. It is based on the evolution of the health index (not the classic consumer price index).

A crucial point of vigilance concerns retroactivity. Belgian law is very clear: a host who forgets to request indexation on the anniversary date can catch up later, but with a legal retroactivity limited to a maximum of 3 months preceding the month of the request. Any request dating back more than three months is illegal and should not be paid by the tenant.

Practical usage example: The anniversary date of your shared housing lease is February 1st. Your host forgets to index and realizes it in May. On May 15th, they send you a letter requesting indexation. They are entitled to claim the supplement for the current month (May) and for the three preceding months (April, March, February). On the other hand, if they wake up in September, they will only be able to claim the supplement for September, August, July, and June. The months from February to May will be definitively lost for them.

Essential points of vigilance for tenants

As a tenant or flatmate, you should not blindly accept the new amount calculated by your host. Errors are human, and calculations incorporating EPC correction factors are complex. Your first reflex should be to visit the official Belgian government rent calculator (Statbel). This free tool, updated in real time, incorporates all the regional specificities and 2026 EPC corrections. You just need to encode your lease date, base rent, region, and EPC score to get the exact amount to the cent.

Then, always check the administrative documents. As mentioned previously, demand proof of the lease registration (especially in Brussels) and ensure you have received a copy of the full EPC certificate, not just a verbal mention of its letter. Finally, keep in mind that dialogue should be prioritized. If you find an error, respond in writing, cordially, by attaching the Statbel simulation.

Practical usage example: Your host asks you for an increase of 50 euros. You go to Statbel, enter your data (EPC F in Wallonia), and the calculator indicates a legal increase of only 22 euros. You send an email to your host: 'Dear host, following your indexation request, I checked the calculation via the official Statbel tool which takes into account the legal correction for our EPC F. The legal amount is 22 euros. You will find the PDF of the calculation attached. I am setting up the standing order for this new amount starting this month.' Clear, concise, and irrefutable.

Homestay and shared housing: Roomlala's commitment to security

Real estate regulation is alive, and it is sometimes difficult to sort through the laws actually in force and political debates. For example, you may have heard of the Walloon Socialist Party's proposal at the end of 2025 aimed at permanently banning the indexation of EPC F and G properties. Be careful: this was a political debate, and this measure is not applicable this May 2026! It is fundamental to rely on current laws to avoid unnecessary disputes.

At Roomlala, our mission is to secure homestay and shared housing rentals. We know that the relationship between a host and their tenant is based on trust. This is why we make it a point of honor to inform our community of everyone's legal obligations. By using our platform, hosts are encouraged to provide transparent listings, including the EPC score of their property, while tenants benefit from a clear and secure framework for their payments and procedures.

Whether you are offering a spare room in your house to round out your monthly income, or looking for an affordable shared housing that respects energy standards, Roomlala is by your side. We provide you with contract templates compliant with 2026 laws and guide you through the twists and turns of indexation. Because a well-understood and respected lease is the guarantee of a peaceful and sustainable cohabitation.

Practical usage example: A Brussels-based host registers on Roomlala to rent out two rooms. When creating their listing, our system reminds them of the importance of mentioning their EPC and registering their lease to be able, when the time comes, to index their rent legally. For their part, the tenant who books via Roomlala knows they are entering a home where the rules of the game are announced from the start, protecting them against abusive increases. That's peace of mind signed Roomlala!

• Always check your EPC: It is the keystone of indexation in 2026.
• Use the Statbel calculator: Never do the calculation by hand, the correction factors are complex.
• Respect the deadlines: Hosts, request indexation in writing on the anniversary date. Tenants, check the 3-month retroactivity rule.
• Registered lease: An absolute obligation, particularly monitored in Brussels.

In summary, the year 2026 marks the return of indexation for all, but under high energy surveillance. Hosts, invest in insulating your properties to preserve their profitability. Tenants, know your rights to protect your budget. And don't forget: for a homestay or shared housing with complete peace of mind, trust the Roomlala community!