Why choose Avenir Renovations?
Why install solar panels in Leuven?
Reduce dependence on the electrical grid
Every kilowatt-hour produced and consumed on-site is a kilowatt-hour that you do not buy. With a washing machine programmed during the day, a heat pump or an electric car charging at noon, the self-consumed share quickly increases.
The surplus injected into the grid is compensated by your supplier, but at a price significantly lower than that of purchased electricity. Hence the interest in consuming what you produce.
Enhance a roof that only serves to cover the house
Many roofs in Leuven, oriented south, east, or west, only serve to cover the house. An east-west orientation produces a little less in total, but spreads production throughout the day, which often aligns better with a family's consumption.
Improve the EPC label and prepare for electrification
Photovoltaic panels count in the calculation of the EPC certificate. They make perfect sense in an insulated house that is gradually transitioning to electric heating via a heat pump.
In this case, the electricity produced during the day directly powers the heat pump or the boiler, significantly reducing the additional electricity bill related to heating.
Our solar solutions in Leuven
Avenir Renovations offers various solar solutions in Leuven to optimize your energy consumption. Photovoltaic panels, batteries, and thermal equipment adapt to the needs of your home.
Before installation: roof study and sizing
Before installing solar panels, a technical study allows for checking the roof and adapting the power to the household's needs. This preparation ensures a high-performing and durable installation.
Orientation, inclination, shadows cast by a chimney, a tree, or the neighboring building, condition of the covering: a roof that needs to be redone in five years should be done before the installation of the panels, not after. On a fiber cement roof containing asbestos, Flemish regulations also prohibit installing panels without prior removal.
It all depends on the consumption. For a household consuming about 3,500 kWh per year without a heat pump, an installation of 3 to 4 kWp is often a good starting point. With a heat pump or an electric car, the useful power increases.
We start from your bills or the data from your digital meter, quarter hour by quarter hour, to see when during the day you actually consume.
A roof in good condition easily supports the weight of the panels, around a dozen kilos per square meter. However, we check the framework, the hooks suitable for tiles or slates, and the condition of the under-roof during the study.
What is the price of a solar panel installation in Leuven?
The installed power, the equipment, the type of roof, and the battery option determine the budget. The amounts include the reduced VAT of 6%, accessible if the house is more than ten years old.
| Type of work | What affects the price | Indicative price including VAT |
| Installation 3 to 4 kWp (8 to 10 panels) | Type of inverter, orientation, access to the roof | 4,000 to 6,000 € |
| Installation 5 to 6 kWp (12 to 15 panels) | Shadows, length of wiring to the panel | 5,500 to 8,500 € |
| Installation on flat roof (weighted supports) | Number of panels, allowable weight of the roof | 6,000 to 9,500 € |
| Supplement for micro-inverters or optimizers | Number of panels affected by shade | 500 to 1,500 € |
| Home battery 5 to 10 kWh installed | Capacity, compatibility with the inverter | 4,000 to 8,000 € |
| Energy manager and boiler control | Number of controlled devices | 400 to 1,200 € |
| Solar thermal boiler (hot water) | Surface area of collectors, volume of the boiler | 4,500 to 8,000 € |
The study focuses on three points: orientation and inclination of the roof, shadows throughout the day, consumption profile based on your bills or the data from your digital meter. You then receive a detailed proposal with estimated production and self-consumed share.
Example: for a terraced house in Kessel-Lo with a southwest slope, a 4 kWp installation produces on average around 3,500 kWh per year. If the household consumes directly one third to half, the investment generally pays off in seven to eight years.
Procedures and grants for solar panels in Leuven in 2026
The permit: generally not required
Panels installed on the plan of a sloped roof are most often exempt from omgevingsvergunning. For a protected building or one listed in the heritage inventory in the historic center of Leuven, a verification is necessary before ordering.
The electrical inspection and declaration to Fluvius
Like any new electrical installation, the panels and their inverter undergo a compliance check RGIE, conducted by an accredited body, before commissioning. The installation is then declared to Fluvius, the network manager in Flanders. We prepare the single-line diagram and the necessary documents.
No regional grant, but a reduced VAT
Flanders no longer grants a grant for new solar panels or for home batteries. The drop in prices has compensated: a well-sized installation generally pays for itself in six to nine years depending on self-consumption. The reduced VAT of 6% applies under certain conditions to homes over ten years old, which significantly impacts the final budget.
Production, lifespan and developments of the installation
Unused solar electricity
It is injected into the grid and compensated by your supplier, at a rate that depends on the contract. With a dynamic contract, the benefit of consuming at the right time is even more pronounced.
Solar production under the Belgian sky
The panels also produce on cloudy days, but less than in full sunlight. In Belgium, most of the annual production occurs from April to September. In December, an installation often produces five to ten times less than in June: therefore, it is sized for the year, not for a summer month.
Maintenance of the panels
On a sloped roof, rain is generally sufficient to clean the panels. A glance from time to time and monitoring production can help identify a problem. Under trees or near a heavily trafficked road, a clear water cleaning every two or three years may be useful.
Lifespan of the panels and inverter
Manufacturers generally guarantee a minimum power for about twenty-five years. The inverter, being more stressed, is often replaced once during the lifespan of the installation, after about twelve years.
The digital meter and injection into the grid
The digital meter, now widespread in Flanders, measures separately the electricity drawn and injected. There is nothing more to install on your side: the installation is simply registered with Fluvius.
Expanding the solar installation later
This is possible if the inverter and the roof allow it. One can also plan from the start a slightly more powerful inverter for a future extension, for example with the arrival of an electric car.
Frequently asked questions about solar panels in Leuven
Do solar panels increase the value of a house?
They improve the EPC label and reduce the electricity bill, two elements that buyers closely examine. A recent, well-sized installation accompanied by its control documents is a concrete argument during a sale.
Do the panels work during a power outage?
Generally no: for safety, the inverter stops when the grid is down, to avoid sending power onto a line under repair. Only certain systems with batteries and backup function can supply a few circuits in the house during an outage.
Can solar panels be installed on a flat roof of an annex?
Yes. The panels are installed on sloped supports, weighted down to avoid piercing the membrane. First, it is checked that the waterproofing is in good condition and that the roof can support the weight of the weights, which is often the case on the rear annexes of Leuven houses.
How long does it take to install solar panels?
The installation itself takes one to two days for a house. One should count a few weeks between signing and commissioning, the time to deliver the equipment, perform the electrical inspection, and register the installation with Fluvius.
Can your roof in Leuven produce solar electricity?
The answer depends on the orientation of your roof, shading, and your consumption habits. A thorough study prevents buying too many panels or not enough.
Request your free roof study. You will know how much electricity to produce, for what budget, and how long it takes for the installation to pay off.
Agency Avenir
Rénovations
for Installation of solar panels in Leuven
An expert to take charge of your renovation projects and guarantee deadlines, budgets and quality of all services.
