EPC F Property Renovation Costs: What You Need to Know in 2026

The question of EPC F property renovation costs is one that more and more Belgian homeowners and buyers are grappling with. A property carrying an F label consumes significantly more energy than average and sits at the very bottom of the energy performance scale. Anyone who owns - or is considering buying - such a property faces concrete renovation obligations and substantial investment. This article explains what you can expect.

What Does an EPC F Label Actually Mean?

The energy performance certificate (EPC) indicates how energy-efficient a property is. Label F means the property has a primary energy consumption of more than 500 kWh per m² per year in Flanders. That is more than four times higher than a well-insulated property with a B or C label.

Such properties typically have little or no roof insulation, single glazing, no cavity wall insulation and an outdated heating system. The result is not only a high energy bill, but also a lower market value and increasingly strict legal obligations. For context: in 2026, the average sale price of an EPC F property is up to 15 to 20% lower than a comparable property with a C label, according to transaction data from notaries.

What Renovation Obligations Apply in 2026?

In Flanders, a renovation obligation applies to residential buildings with a poor EPC label. Anyone who purchased a property with an E or F label after 1 January 2023 had five years to renovate it to at least label D. This means buyers who purchased before 2023 must comply by 2028 at the latest, and buyers who purchased after that date have five years from the date of the deed.

The Flemish government is also working towards a stricter standard: by 2040, all properties must achieve at least label D, and by 2050, label A. If you currently own an EPC F property, it is wise to act in good time. Delaying does not only mean higher costs later - it also carries the risk of higher taxes or complications when selling.

In Wallonia and Brussels, similar trajectories apply, each with their own regional timelines. Always check with your local municipality or regional authority for the most up-to-date information.

How Much Does Renovating an EPC F Property Cost?

Renovation costs depend heavily on the condition of the property, the year it was built and its floor area. That said, the following indicative figures give a realistic picture for an average terraced house of around 150 m²:

• Roof insulation: €3,000 to €8,000, depending on the roof type and accessibility
• Cavity wall insulation: €3,500 to €7,000 for a full house
• Floor insulation: €4,000 to €10,000
• New glazing (high-performance): €6,000 to €15,000 for all windows
• Heating (heat pump or condensing boiler): €5,000 to €20,000
• Ventilation system: €3,000 to €8,000

Combining all these measures quickly adds up to a total budget of €25,000 to €60,000 for a full renovation from EPC F to label C or higher. A phased approach is possible and sometimes makes more financial sense, although you should bear in mind that site costs are lower when the work is carried out all at once.

Grants and Subsidies: How Much Can You Get Back?

Fortunately, you do not have to foot the entire bill yourself. In Flanders, several forms of financial support are available through Fluvius and the Flemish government:

• Mijn VerbouwPremie: a grant that depends on your income and the type of renovation work. Lower and middle incomes receive a higher percentage of their investment back.
• Mijn VerbouwLening: a low-cost loan for those who do not have sufficient personal funds available, with interest rates in 2026 that are significantly more favourable than the market rate.
• Federal tax reduction: for certain energy-saving investments, you may be entitled to a tax benefit.

Make smart use of combined grants: with a full renovation of an EPC F property, you can in some cases recover 30 to 50% of the total costs through subsidies and tax benefits. Seek guidance from an energy expert or a certified renovation adviser.

Selling an EPC F Property: What Are Your Options?

Not everyone wants to - or can - take on a major renovation. If you want to sell an EPC F property, there are two routes:

The first option is to renovate the property before selling, or at least carry out the most impactful improvements. This increases the sale price and makes the property more attractive to a broader pool of buyers. Buyers applying for a mortgage are sometimes subject to stricter conditions from lenders when the property carries a poor EPC label.

The second option is to sell the property in its current condition, with transparent communication about its energy performance and the renovation obligation. This can be a faster route, but you accept a lower price. Prospective buyers will factor the expected renovation cost into their offer.

In both cases, it is worth having a realistic valuation carried out in advance. Through a free valuation on ImmoMakelaarVergelijker, you get an initial picture of what your property is worth in the current market - even with an EPC F label.

Would you like to know which estate agent takes the best approach for your situation? Compare certified estate agents in your area for free and request tailored advice with no obligation.

How to Plan a Renovation Step by Step

Renovating an EPC F property requires careful planning. Here are the steps that deliver the best return:

1. Commission an energy audit from a certified energy expert. This tells you exactly where the biggest heat losses occur and which measures should take priority.
2. Draw up a renovation plan in consultation with a contractor or architect. Request at least three quotes per job.
3. Apply for grants before work begins. For most Flemish grants, a prior application is a prerequisite.
4. Phase the work logically: start with the building envelope (roof, walls, windows) before installing a new heating system. A heat pump operates more efficiently in a well-insulated home.
5. Have a new EPC drawn up after completion to register your improved label.

An EPC F property is certainly not automatically a bad purchase or an unsellable home. With the right preparation and guidance, you can renovate smartly, make the most of available subsidies and significantly increase the value of your property. Would you like to know how estate agents in your area handle energy-poor properties? Compare agents via ImmoMakelaarVergelijker and get no-obligation advice from BIV-certified professionals.

Frequently Asked Questions About EPC F Properties and Renovation Costs