Energy performance and renovation: the new requirements to be met in 2025

In Belgium, the PEB certificate (Energy Performance of Buildings) plays a central role in renovation projects. This document, required when selling or renting a property, indicates the energy performance level of a home. In 2025, the requirements related to the PEB will evolve, with concrete implications for homeowners, whether they are considering a partial or complete renovation. In this article, discover what changes this year, how to effectively improve your PEB score, and how Avenir Rénovations supports you in this process.

Most consulted

Subscribe
to our newsletter

The Energy Performance Certificate (EPC): a reference tool for guiding renovations

The EPC evaluates the overall energy performance of a building by considering:

the insulation of the envelope (roof, walls, floors);
the quality of frames and glazing;
heating, hot water, ventilation, and cooling systems;
the possible presence of renewable energy sources.

It allows for classifying the housing from A (very efficient) to G (very energy-consuming), based on a standardized calculation.

In 2025, this certificate takes on a strategic dimension in renovation projects, as it conditions:

the resale value of the property;
the eligibility for certain grants;
the legality of renting in certain situations.

What changes in 2025 in Wallonia, Brussels, and Flanders

1. Wallonia: towards a renovation obligation for the lowest EPCs

Wallonia has announced a gradual exit plan for energy-consuming housing:

From 2025, properties rented out with an EPC of F or G will require renovations within 5 years;
A minimum EPC score will be gradually required for any new rental (schedule being finalized).

Owners are therefore encouraged to plan their renovations now to anticipate these obligations.

2. Brussels: towards regulated comprehensive renovations

The EPC is already a strong regulatory lever in Brussels:

It is mandatory for sale or rental;
It will become a monitoring criterion for planned renovations under the Renolution program in 2025;
The Region is developing a roadmap by building type: each type (Brussels building, terraced house, etc.) will have a target EPC to achieve in the coming years.

3. Flanders: establishment of a minimum EPC to be respected

Flanders has imposed a renovation obligation within 5 years after purchasing a property with an EPC of E or lower since 2023. In 2025:

The minimum level to be achieved is confirmed as EPC D within the allotted time;
New targeted financial aids are granted for works leading to a significant improvement in the EPC;

The authorities are strengthening post-implementation controls and reporting obligations.

Why improving your EPC score has become essential

A good EPC offers multiple advantages:

AdvantageConcrete impact in 2025

Access to regional grants	Several grants require demonstrable EPC improvement
Better resale value	Properties with a good EPC sell faster and for more
Energy savings	Less thermal loss = reduced bills
Legal compliance (rental/sale)	Some Regions impose a minimum threshold to be met

Note: the EPC also influences home insurance, regional taxes, and "green renovation" loans at certain banks.

What are the most effective renovations to improve your EPC?

Here are the interventions most often recommended by experts to gain one or more EPC letters:

1. Roof insulation

This is the most cost-effective and easiest to implement. About 30% of heat loss occurs through the roof.

2. Replacement of frames

Old single-glazed or uninsulated aluminum frames hinder energy performance.

3. Installation of an efficient ventilation system

A double-flow mechanical ventilation system ensures controlled air exchange without heat loss.

4. Replacement of the boiler

Switching from an oil boiler to a heat pump or a condensing gas boiler leads to a significant improvement in the EPC.

5. Addition of renewable energy production

Photovoltaic panels and solar water heaters are also valued in the EPC calculation.

The role of Avenir Rénovations in your EPC improvement

Improving your EPC certificate requires a holistic view of the building and rigorous technical planning. This is where Avenir Rénovations comes in, with a tailored approach:

Technical diagnosis of your property, related to your current EPC certificate;
Planning of works by order of energy priority;
Coordination of a housing audit if necessary to obtain regional aid;
Clear and surprise-free pricing for each renovation item;
Execution of the works in compliance with regional EPC requirements.

Your dedicated Project Manager ensures the link between your project, legal obligations, and administrative requirements.

Case study: moving from an EPC G to an EPC C

Let's take the example of a three-facade house in Liège dating from the 1960s with an EPC G. Thanks to a planned intervention with Avenir Rénovations, the following actions were taken:

Roof + attic insulation;
Replacement of all glazing;
Installation of a heat pump;
Installation of 10 solar panels.

Result: an EPC C achieved, an estimated annual saving of €2,000, and easier access to several grants (Housing, energy, reduced VAT).

Contact Avenir Rénovations Belgium for your EPC improvement

In 2025, the EPC certificate becomes much more than just an indicator: it guides renovations, conditions access to aid, and sets legal obligations to be met. Whether you are an owner-occupier, landlord, or investor, improving the EPC of your property is an essential lever for valuation and compliance.

Avenir Rénovations supports you at every step to sustainably improve your EPC, optimize your works, and benefit from the best available aids.

Want to improve the energy performance of your property?
Request your free quote now, and build your EPC renovation plan with an expert by your side.