Rent indexation in Flanders
In the Flemish Region, the decree of 3 October 2022 applies a permanent EPC correction factor to leases predating 1 October 2022 (EPC D, E, F or no EPC). More recent leases are indexed at 100%, whatever the class.
In short: in Flanders, indexation is annual, on the anniversary of the lease taking effect. For leases predating 1 October 2022, a permanent correction factor reduces the indexed rent: roughly × 0.95–0.98 for EPC D, × 0.89–0.96 for EPC E, F or no EPC, depending on the anniversary month. EPC A, B, C and all leases that entered into force since 1 October 2022: indexation at 100%.
The Flemish legal framework
2022-2023: a temporary limitation first
Like Wallonia and Brussels, Flanders limited the indexation of the least energy-efficient dwellings from October 2022, to cushion the impact of inflation on tenants. From 1 October 2022 to 30 September 2023 (decree of 3 October 2022), an EPC D dwelling could pass on only half of the increase, and a dwelling with EPC E, F or no valid EPC none of it.
Since 1 October 2023: the correction factor
The same decree of 3 October 2022 (article 4, in force since 1 October 2023) sets the current regime: indexation is possible again for all dwellings, but leases that took effect before 1 October 2022 with an EPC D, E, F or no EPC are subject to a correction factor. This factor permanently neutralises the increase that could not be applied during the temporary phase: it is fixed once and for all per anniversary month and applies to every future indexation of the lease. The official tables are published on vlaanderen.be.
The EPC factor in Flanders
Label G does not exist in the Flemish EPC. Contracts taking effect from 1/10/2022: 100% all classes.
The factor multiplies the rent obtained with the standard formula. It depends on two things: the EPC class (D on one side; E, F or no EPC on the other) and the anniversary month of the lease. Flemish specifics: label G does not exist, and no certificate is required to index — but without an EPC, the strongest reduction factor (that of classes E-F) applies. The factor stops applying as soon as the landlord obtains a new EPC A+, A, B or C; moving from E-F up to D switches to the D factor.
Differences with Wallonia and Brussels
| Aspect | Wallonia | Brussels | Flanders |
|---|---|---|---|
| EPC regime in 2026 | Adapted method (rebasing) for EPC D-G leases capped in 2022-23 | Monthly factor — leases predating 14/10/2022, EPC E-F-G | Monthly factor — leases predating 1/10/2022, EPC D-E-F or no EPC |
| Class C | 100% | 100% | 100% |
| Class D | adapted* | 100% | × 0.95–0.98 |
| Class E | adapted* | × 0.95–0.99 | × 0.89–0.96 |
| Class G | adapted* | × 0.89–0.98 | n/a (label does not exist) |
* Wallonia: only for leases with an anniversary between 1/11/2022 and 31/10/2023.
Calculate your Flemish indexation
The calculator below automatically applies the correct EPC coefficient based on the class you indicate. Select 'Vlaanderen' in the region selector, enter the dates and the initial rent, and the result will take into account the Flemish decree of 3 October 2022.
A few details.
The calculation from your data.
Property region, lease dates, initial rent, EPC class. The calculation runs instantly.
Worked example
Flemish lease that took effect on 1 September 2022, rent €950, EPC E, indexation on 1 September 2026:
Health index August 2022: 123.68 — Health index August 2026: 140.30 (2013 base)
Standard formula: 950 × 140.30 / 123.68 = €1,077.66
EPC E correction factor, September anniversary: × 0.9601
Indexed rent = 1,077.66 × 0.9601 = €1,034.66 (€43 per month less than without the factor)
For French-speaking owners of a property in Flanders
If you own a property in the Flemish Region but reside in Wallonia or Brussels, several points to keep in mind:
- Flemish administrations operate in Dutch: draft the lease contract in Dutch, or have it translated, to avoid any dispute
- The same goes for the indexation notification to the tenant
- Lease registration is performed at the registration office of the location of the property (i.e. in Flanders)
- The calculator remains valid: the formula is national; only the EPC correction factor is regional
Frequently asked questions — Flanders
Why is the EPC factor permanent in Flanders? + −
The Flemish decree of 3 October 2022 applies a correction factor to leases that took effect before 1 October 2022 when the dwelling has an EPC D, E, F or no EPC. This factor, set per anniversary month of the lease, applies to every indexation: it has no end date.
What is the difference between EPC and PEB? + −
Mostly the wording: PEB (Performance Énergétique du Bâtiment) in French, EPC (EnergiePrestatieCertificaat) in Dutch. Note that the scales are not identical — label G does not exist in the Flemish EPC.
My Flemish lease dates from 2024 with EPC E: can I apply indexation? + −
Yes, at 100%. The correction factor only targets leases that took effect before 1 October 2022. A 2024 lease is indexed with the standard formula, whatever the EPC class.
I am a French-speaking owner of a property in Flanders — where should I start? + −
Flemish administrations operate in Dutch: draft the lease and the notifications in Dutch, or have them translated, to avoid any dispute. The calculation remains based on the single Belgian health index — the formula is identical.
Does the calculator work for Flanders? + −
Yes — select 'Vlaanderen' in the region selector. The correction factor is applied automatically according to the EPC class and the lease date.
What if I have no EPC? + −
In Flanders, no certificate is required to apply indexation. For a lease predating 1 October 2022 with no EPC, the factor for classes E-F (the strongest reduction) applies. Having an EPC issued — valid for 10 years — can therefore pay off if the dwelling scores better.
Going further
- Main calculator (select Vlaanderen)
- Our calculation methodology
- Health index table
- Compare with Wallonia
- Compare with Brussels
Page updated on 21/09/2026. Sources: Flemish decree of 3 October 2022 (amended on 7/10/2022 and 21/04/2023), correction factor tables (vlaanderen.be), Law of 6 August 1993, Statbel. This content is informational and does not constitute legal advice.