Rent indexation and EPC certificate in Flanders: What is changing for shared housing by the end of 2026

It is the end of 2026, and the rental market in Belgium continues to evolve, particularly in the northern part of the country. If you are a host of a shared housing unit or a tenant, you are certainly wondering about the rent indexation in Flanders for 2026. After years marked by the energy crisis and emergency measures, legislation has stabilized, yet it has left behind some complex calculation mechanisms. At Roomlala, we know that managing a rental or signing a lease can be a source of stress. That is why we have broken down the latest rules in effect for you.

Flanders has firmly linked rent adjustments to the energy performance of buildings. Gone are the days when one could index a rent without worrying about the home's insulation! Today, the EPC certificate for shared housing (Energieprestatiecertificaat, the equivalent of the PEB) is at the heart of the landlord-tenant relationship. Whether you are a host wanting to ensure compliance or a flatmate wanting to verify that your rent is fair, this article guides you step-by-step through the legal obligations and the rights of everyone at the end of 2026.

Read also: 2026 Brussels rent indexation: Energy performance certificate (EPC) and shared housing rules, Rental security deposit in Flanders 2026: New rules for long-term room rentals and 2026 Canada rental laws: Why long-term room rentals are becoming the better option over Airbnb

Understanding rent indexation in Flanders in 2026

Since the end of 2023, and this rule remains strictly in effect at the end of 2026, the total freeze on rent indexation for energy-inefficient homes in Flanders has been lifted. For a one-year period (from October 2022 to October 2023), the Flemish government prohibited or limited indexation to protect tenants from soaring energy prices. Today, the situation is different: all rents can once again be indexed, regardless of the home's energy label.

However, this lifting of the freeze does not mean a return to the total freedom seen before the crisis. To protect tenants from a brutal catch-up (where landlords could have applied the inflation accumulated during the freeze period all at once), the legislator has put in place very strict safeguards. These energy-related rent rules aim to smooth out increases and encourage landlords to renovate their properties.

At Roomlala, we find that many of our users are still confused by these directives. It is essential to understand that the right to indexation is no longer a blind automatic process: it is now conditional upon energy transparency and compliance with the administrative procedures of Flemish rental law.

The central role of the EPC certificate in shared housing

The EPC certificate (Energieprestatiecertificaat) has become the cornerstone of renting in Flanders. This document evaluates the energy performance of your home on a scale ranging from A+ (highly efficient) to F (highly energy-consuming). In the context of shared housing, providing this certificate is not just an administrative formality; it is a strict legal obligation.

To be able to index a rent in 2026, the landlord must have provided a copy of a valid EPC certificate to the tenants. If this document is missing, the law is uncompromising: the landlord will be heavily penalized in their indexation calculation. We advise you to always attach this document to the lease at the time of signing to avoid any subsequent dispute.

Use case: Imagine you rent a large house in Antwerp to four young professionals. If you lose your EPC certificate or if it has expired (they are valid for 10 years), you will not be able to apply a normal indexation. You will be forced to apply the lowest rate, as if your house were rated F, which represents a significant loss of income over a year.

Prerequisites for indexing a rent

Beyond the EPC certificate, indexing a rent in Flanders requires compliance with several formal conditions. First of all, it is imperative that the rental contract be a written lease. Verbal agreements, although increasingly rare, do not allow for the claiming of a legal indexation.

Next, the lease must be duly registered with the competent registration office (FPS Finance). Registration is free for residential leases and must be completed within two months of signing. At Roomlala, we often remind our hosts that the lack of registration deprives the landlord of their right to indexation, while allowing the tenant to leave the premises without notice.

Finally, indexation only occurs once a year, at the earliest on the anniversary date of the lease taking effect. It is based on the health index, which excludes certain products such as tobacco and fuel, thereby ensuring a more measured evolution of housing costs.

The correction factor mechanism (Leases from before October 2022)

This is where Flemish legislation becomes particularly technical. To prevent landlords of poorly insulated homes from catching up on indexation lost during the 2022-2023 freeze, Flanders introduced a "correction factor." This mathematical mechanism applies specifically to primary residence leases that came into effect before October 1, 2022.

If you signed a Belgium shared housing lease (Flemish side) after that fateful date of October 1, 2022, this correction factor does not apply to you. For these more recent contracts, indexation is done in the classic way, even if the home has a poor EPC label. The legislator considers that for recent leases, the initial price was set while taking the energy crisis into account.

It is therefore essential to check the start date of your contract. We recommend that all our users carefully re-read the first page of their lease to ensure they know the applicable calculation formula.

How does this correction apply according to labels?

The correction factor applies gradually according to the building's energy performance. If your home has an EPC label of A, B, or C, congratulations: you are not subject to any correction factor. You can apply standard indexation at 100%, thus rewarding your renovation efforts.

Conversely, for homes with an EPC label of D, indexation is capped at 50% of the inflation calculated over the freeze period, then adjusted. For homes with an E or F label (energy sieves), the correction factor is even stricter, drastically limiting the rent increase to protect the purchasing power of the flatmates.

Point of vigilance: The penalty in the absence of an EPC is severe. Renting a shared housing unit without a valid EPC certificate forces the landlord to apply the most penalizing correction factor, i.e., that equivalent to labels E and F. Therefore, never neglect this step!

Concrete example and calculation tools

Calculations involving the correction factor are complex because they require using health indices from different years (2022, 2023, and the current year). An error is easily made, which can damage the trust relationship between the landlord and their flatmates.

Concrete example: Let's take a shared housing unit in Ghent rented at €1,200 since January 2021 (before Oct. 2022). The EPC label is E. On the anniversary date in January 2026, the landlord cannot simply multiply €1,200 by the new health index divided by the base index. They must apply the formula including the Flemish correction factor, which will result in an increase significantly lower than that of a home rated A.

To avoid any error, we strongly advise you to use the official rent calculator from Statbel (the Belgian statistical office). This free online tool automatically integrates the Flemish regional corrections. You only need to enter the signing date, base rent, region, and EPC label to obtain the exact and legal amount to the nearest cent.

Primary residence shared housing vs. Student 'Kot': What are the differences?

In Flanders, the legal qualification of the lease has a direct impact on indexation rules. It is crucial to distinguish between classic shared housing (where tenants establish their primary residence) and student shared housing (the famous "kot"). Rights and obligations are not the same.

The EPC correction factor, with all its subtleties for leases prior to October 2022, applies exclusively to primary residence leases. This is the most common form for young professionals, families, or expats sharing a large apartment or house.

If you are mistaken about the nature of the lease, you risk applying incorrect rules. At Roomlala, we ensure that our listings clearly specify the type of audience sought, as this determines the legal framework of the rental contract.

The primary residence lease in shared housing

In a primary residence lease for shared housing, tenants register with the municipality at the property address. They live there permanently. For this type of contract, Flemish rental law deploys its full arsenal of protections, including strict rules related to the EPC certificate and the correction factor.

Furthermore, since 2019, Flanders has introduced the specific "shared housing lease" (Medehuur), which manages the arrival and departure of a single flatmate without having to break the entire lease. This co-tenancy agreement is very practical, but it does not change the start date of the initial lease for indexation calculations. If the initial lease dates back to 2021, the correction factor still applies, even if a new flatmate arrived in 2025.

The student lease (Kot) and its specificities

Conversely, the student lease in Flanders escapes the rule of the correction factor linked to the EPC. Why? Because students generally maintain their primary residence at their parents' home. The "kot" is only a secondary residence linked to their studies.

For "kots," indexation remains possible every year on the anniversary date, based on the classic health index, regardless of the building's energy label or the contract signing date. The legislator considered that the student housing market had its own dynamics and required simplified rules.

Use case: You rent a house in Leuven divided into 4 rooms for university students. Although the building is old and rated EPC D, you can index the rents each year normally, because these are student contracts. Be careful, however, to use a lease template specifically drafted for student housing!

Steps, deadlines, and practical tips for landlords and tenants

Knowing the theory is one thing; applying it by the book is another. Rent indexation is never automatic. It is a right that the landlord must actively exercise, following strict formalities so that the request is legally valid.

At Roomlala, we advocate for transparent and kind communication. An poorly communicated indexation is often perceived as an aggression by tenants. It is therefore essential to do things properly, briefly explaining the calculation (or attaching the result from the Statbel calculator) to prove your good faith.

Whether you are on one side or the other of the contract, here are the procedural rules to keep in mind at the end of 2026 to manage your shared housing serenely.

The landlord's obligations

To index the rent, the landlord must notify the flatmates in writing. A simple text message or phone call has no legal value. We recommend sending an email with a read receipt or, better yet, a registered letter if relationships are strained.

The written request must mention the new rent amount and the date from which it is payable. A crucial point: the law provides for a legal retroactive effect, but it is strictly limited to a maximum of 3 months preceding the month of the request.

Example: If your lease anniversary date was in August, and you forget to index until November, you can claim the indexation for November, as well as the arrears for October, September, and August. But if you wake up in December, the month of August is lost forever.

The tenants' rights and recourse

As a flatmate, you have the right to demand transparency. If your landlord announces a rent increase, your first reflex should be to verify two things: the presence of a valid EPC certificate attached to your lease, and the accuracy of the calculation via the Statbel website.

If you find that the landlord failed to apply the correction factor when they were obliged to (lease from before October 2022, EPC D, E, F, or missing), you have the right to contest the increase. We advise you to do so in writing, politely but firmly, by providing the correct calculation.

In case of persistent disagreement, the dispute can be brought before the Justice of the Peace. However, thanks to the official tools now available and the clarity of the rules in 2026, the vast majority of situations are resolved amicably. At Roomlala, we remain by your side to provide you with reliable information and help you rent with complete peace of mind.