Can you raise the rent after installing solar panels?

The global shift towards sustainable energy solutions has made solar panels an attractive option for many property owners. Not only do they reduce electricity bills and carbon footprints, but they also potentially increase the value of the property. But if you’re a landlord in Belgium, you might be wondering: Can I raise the rent after installing these panels? Let’s dive into the regulations across the three Belgian regions.

solar pannel
Saria Nepriakhina

Reaching an agreement with your tenant

Before making any changes, it’s crucial to discuss your plans with your tenant. Open communication can prevent misunderstandings and disputes down the line. If both parties agree to the rent increase due to the solar panel installation, it’s essential to document this agreement in writing. Ensure that the tenant signs the document to indicate their approval.

Rules by region

Belgium’s three regions – Brussels, Flanders, and Wallonia – have distinct regulations concerning rent adjustments after property improvements.

Brussels and Flanders

For rental contracts signed after January 1, 2019, in both Brussels and Flanders, landlords can increase the rent without any formalities. However, in Brussels, a few conditions apply:
– You must inform your tenant at least one month before the commencement of the solar panel installation.
– The rent adjustment is only permissible for leases that last nine years or more.
– Rent can be increased only once every three years.


In Wallonia, landlords and tenants must mutually agree on the rent increase, and this can only occur after a three-year period. The same rule applies to properties in Flanders with leases signed before January 1, 2019.

What if there’s no agreement?

Disagreements can arise, especially when it comes to financial matters. If you haven’t reached a prior agreement with your tenant and they refuse a rent increase post-installation, you have legal recourse. Under specific conditions, you can approach the court to request a rent review. This is feasible if the standard rental value, due to the solar panel installation, exceeds the agreed rent by 10%.

Benefits of solar panels for tenants

While landlords see the financial benefits of solar panels in terms of property value, tenants also stand to gain. Here are some points you can highlight to your tenant when discussing a potential rent increase:
Reduced electricity bills: Solar panels can significantly cut down on electricity costs, leading to monthly savings.
Eco-friendly living: Tenants can take pride in contributing to a greener planet.
Consistent power supply: In areas prone to power outages, solar panels can provide a consistent power source.


Installing solar panels on your rental property is a commendable step towards sustainable living. While it’s an investment, it can also lead to increased rental income. However, it’s essential to understand the regional regulations in Belgium and maintain open communication with your tenant. By taking a collaborative approach, both parties can benefit from this green energy solution.