Rent indexation and EPC certificates in Flanders: What changes for shared housing by the end of 2026

It is late 2026, and the rental market in Belgium continues to evolve, particularly in the north of the country. If you are a host of a shared home or a tenant, you are certainly asking yourself questions about the 2026 Flanders rent indexation. After years marked by the energy crisis and emergency measures, legislation has stabilised, but it has left behind some sometimes 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 force for you.

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

See also: 2026 Brussels rent indexation: EPC and rules for shared housing, Rental security deposit in Flanders 2026: The new rules for renting a room long-term and Canada rental laws 2026: Why long-term room rentals are a must over Airbnb

Understanding rent indexation in Flanders in 2026

Since the end of 2023, and this rule is still strictly in effect in late 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 had banned 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 property'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 sudden catch-up (where hosts could have applied the inflation accumulated during the freeze period all at once), the legislator has put very strict safeguards in place. These energy rent rules aim to smooth out the increase and encourage hosts to renovate their properties.

At Roomlala, we see that many of our users are still confused by these directives. It is essential to understand that the right to indexation is no longer an automatic default: it is now conditional upon energy transparency and compliance with the administrative procedures of Flanders 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 assesses the energy performance of your property on a scale ranging from A+ (highly energy-efficient) to F (highly energy-inefficient). In the context of shared housing, providing this certificate is not just a simple administrative formality, it is a strict legal obligation.

To be able to index a rent in 2026, the host must have provided a copy of a valid EPC certificate to the tenants. If this document is missing, the law is uncompromising: the host will be heavily penalised in their indexation calculation. We advise you to always attach this document to the lease upon signing to avoid any future disputes.

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 normal indexation. You will be forced to apply the lowest rate, as if your house were an F-label, which represents a significant loss of earnings over the year.

The prerequisites for indexing a rent

In addition to 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 legal indexation to be claimed.

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

Finally, indexation only happens 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 like tobacco and fuel, thereby ensuring a more measured evolution of housing costs.

The correction factor mechanism (Leases before October 2022)

This is where Flemish legislation becomes particularly technical. To prevent hosts of poorly insulated homes from catching up on the 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 1 October 2022.

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

How does this adjustment 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 the standard indexation at 100%, thus rewarding your renovation efforts.

On the other hand, 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 (thermal sieves), the correction factor is even more severe, drastically limiting rent increases to protect the tenants' purchasing power.

Point of vigilance: The penalty for not having an EPC is heavy. Renting a shared property without a valid EPC certificate forces the host to apply the most penalising correction factor, i.e., the one equivalent to E and F labels. So, 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 between the host and their tenants.

Concrete example: Let's take a shared home in Ghent rented for €1200 since January 2021 (before Oct. 2022). The EPC label is E. On the anniversary date in January 2026, the host cannot simply multiply €1200 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 an A-rated home.

To avoid any errors, we highly advise you to use the official rent calculator from Statbel (the Belgian statistical office). This free online tool automatically incorporates the Flemish regional corrections. You just need to enter the signature date, the base rent, the region, and the EPC label to obtain the exact and legal amount down to the cent.

Shared primary residence vs Student housing (Kot): What are the differences?

In Flanders, the legal classification of the lease has a direct impact on indexation rules. It is crucial to distinguish between a classic shared home (where tenants establish their primary residence) and student shared housing (the famous "kot"). The 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 who share 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 shared lease, tenants register with the local municipality at the address of the property. They live there permanently. For this type of contract, Flanders rental law deploys its full arsenal of protection, including strict rules related to the EPC certificate and the correction factor.

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

The student lease (Kot) and its specificities

Conversely, the student lease in Flanders escapes the rule of the EPC-related correction factor. 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 each year on the anniversary date, based on the classic health index, regardless of the building's energy label or the contract signature date. The legislator considered that the student housing market had its own dynamic 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 written for student housing!

Procedures, deadlines, and practical tips for hosts and tenants

Knowing the theory is one thing, applying it correctly is another. Rent indexation is never automatic. It is a right that the host must actively exercise, respecting a strict formality for the request to be 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, by briefly explaining the calculation (or by attaching the result from the Statbel calculator) to prove your good faith.

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

The obligations of the host

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

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

Example: If the anniversary date of your lease 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 rights of tenants and recourse

As a tenant, you have the right to demand transparency. If your host 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 host omitted to apply the correction factor when they were obliged to do so (lease from before October 2022, EPC D, E, F or absent), you are entitled to contest the increase. We advise you to do this 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.