The cost of not declaring your renovation works? It’s about to get steep!

Renovating a property is an exciting venture, often leading to enhanced comfort, aesthetics, and property value. However, with the thrill of transformation comes the responsibility of legal compliance. In Belgium, homeowners are required to declare any significant renovation works to the cadastre. Failing to do so can lead to substantial penalties, and recent changes have made these fines even more daunting.

Home building

Tripled fine amounts

Gone are the days when the maximum penalty for not declaring renovation works was a mere 1,250 euros. The authorities have now upped the ante, with fines that can reach up to 3,000 euros for non-compliance. This significant increase aims to ensure that homeowners consistently report any works carried out on their properties.

30-day declaration window

Once the renovation is complete, the clock starts ticking. Homeowners have a 30-day window to report any construction or renovation to the cadastre. This stipulation is in place because renovations can significantly impact a property’s value, subsequently affecting its rental value.

Effects on the cadastral income

The cadastral income is a crucial factor in determining taxes. If a property’s value increases due to renovations, the cadastral income must be adjusted accordingly. Overlooking this declaration can lead to fines ranging between 1,000, 2,000, and 3,000 euros, depending on the new cadastral value of the property.

Which renovations are in the spotlight?

Not all renovations impact the value of a property. For instance, installing solar panels doesn’t necessarily alter a property’s worth. However, certain renovations, such as refurbishing a bathroom or converting an attic into a livable space, can significantly influence a property’s value. Such renovations need to be declared to the cadastre.

Why the emphasis on declaration?

The government’s move to increase fines is not arbitrary. It’s a reflection of the importance of maintaining an accurate record of property values within the country. Accurate cadastral values ensure that homeowners pay the correct amount of taxes, which in turn supports public services and infrastructure.

Moreover, from a homeowner’s perspective, declaring renovations can be beneficial. It provides an official record of improvements made to the property, which can be advantageous during resale negotiations.


While the excitement of renovating a home can be overwhelming, it’s essential not to overlook the legal obligations that come with it. The increased fines serve as a reminder of the importance of declaring renovations. By staying compliant, homeowners can enjoy their newly renovated spaces without the looming threat of hefty penalties.

For those planning renovations or who have recently completed them, it’s advisable to consult with legal or real estate professionals to ensure all declarations are correctly made. After all, a little diligence now can save a lot of financial strain later.