Solar
Solar panel prices in Belgium in 2026 (3, 4, 6 and 8 kWp)
How much does a solar PV system cost in 2026? Indicative prices by system size, what makes the price vary and how to read a quote without unpleasant surprises.
By the RhinoEnergy advisersUpdated on 7 min read
Solar panel prices in Belgium have fallen sharply in recent years and have now levelled off in 2026. For a house, you should generally budget between €1.10 and €1.60 per watt-peak (Wp) installed, including 6% VAT, which puts a typical home system at a few thousand euros. Behind that average, however, there are big differences depending on the size of the system, the roof and the equipment chosen.
In this guide we set out indicative price ranges for the most popular system sizes (3, 4, 6 and 8 kWp), the factors that push the price up or down and the points to check on a quote. These figures are ballpark amounts seen on the Belgian market, not guaranteed prices: only a quote drawn up after a site survey is binding.
Before talking money, keep one thing in mind: the right system size is not the largest your roof can take, but the one that matches your consumption. Now that the old "reversing meter" arrangements are being phased out in all three regions, an oversized system exports a lot of electricity to the grid at a low price, which erodes its return.
Solar PV prices by system size
The table below gives price ranges including VAT and installation, for a house more than 10 years old (6% VAT) with an easily accessible tiled or slate roof. They usually cover the panels, inverter, mounting system, cabling, installation and the electrical inspection.
| System size | Number of panels (approx.) | Estimated annual output | Indicative price incl. 6% VAT |
|---|---|---|---|
| 3 kWp | 7 to 8 panels | 2,600 to 2,900 kWh | €4,000 to €5,500 |
| 4 kWp | 9 to 10 panels | 3,400 to 3,800 kWh | €5,000 to €6,800 |
| 6 kWp | 14 to 15 panels | 5,100 to 5,700 kWh | €7,000 to €9,500 |
| 8 kWp | 18 to 20 panels | 6,800 to 7,600 kWh | €9,000 to €12,000 |
A few pointers for reading this table:
- The price per kWp falls as the system gets bigger: fixed costs (travel, scaffolding, inverter, inspection) are spread over more panels.
- The output figures assume roughly 850 to 950 kWh per kWp per year, a common order of magnitude in Belgium for an unshaded roof facing south, south-east or south-west.
- Today's panels are usually rated between 400 and 450 Wp each, which explains the number of modules shown.
If your home is less than 10 years old, the VAT rate is in principle 21%: the same project then costs around 14% more.
What size of system does your home need?
The ideal size depends above all on your annual electricity consumption, which you will find on your annual settlement bill. A simple rule is to aim for output close to your consumption, or slightly below it if nobody is at home during the day.
| Household profile | Typical annual consumption | System size often recommended |
|---|---|---|
| Couple, flat or small house | 2,000 to 3,000 kWh | 2.5 to 3 kWp |
| Family of four | 3,500 to 4,500 kWh | 4 to 5 kWp |
| Family with a heat pump | 6,000 to 8,000 kWh | 6 to 8 kWp |
| Family with a heat pump and an electric car | 8,000 kWh and more | 8 kWp and more |
If you are planning a heat pump or an EV charger in the next few years, mention it to the installer now: they can fit an inverter with enough headroom to add a few panels later.
In Brussels, 5 kWp is an important threshold for green certificates: residential systems up to 5 kWp keep the most favourable award rate. We explain this in detail in our article on whether solar panels are worth it in Belgium.
What makes the price of a solar system vary
Two quotes for the same system size can be several thousand euros apart. These are the main factors.
The type of roof
A pitched tiled roof is the simplest set-up. Natural slate needs more care. A flat roof requires ballasted or tilted frames, which usually cost a little more. If your roof covering is nearing the end of its life, it is wiser to renovate the roof before putting panels on it for 25 years.
Equipment quality
Monocrystalline panels from an established brand, with a long product warranty (often 20 to 25 years) and a performance guarantee, cost more than entry-level modules. The same applies to the inverter: a string inverter, microinverters or optimisers (useful with partial shading or a roof with several orientations) are not priced the same.
Access and complexity
Building height, the need for full scaffolding, dormer windows, chimneys, several roof slopes and the distance between the roof and the consumer unit all add labour hours.
Options
- a home battery, which adds significantly to the bill (see our article is a home battery worth it?);
- an advanced monitoring system or an energy manager that controls the water heater or the EV charger;
- bringing the consumer unit up to standard if the existing wiring is old.
What a good quote should include
A proper quote should let you compare offers line by line. Check that it states:
- the brand, model and rated power of the panels, and how many there are;
- the brand and model of the inverter (and of any optimisers);
- an estimate of annual output based on your roof's orientation and pitch;
- a mounting system suited to your roof covering;
- the compliance inspection by an approved body (under the RGIE/AREI electrical regulations) and the paperwork with the grid operator (Fluvius in Flanders, Sibelga in Brussels, ORES, RESA and others in Wallonia);
- the VAT rate applied and why;
- the product, performance and workmanship warranties;
- the lead time and payment terms.
Be wary of quotes far below the market, large deposits demanded on signature and salespeople who push you to sign the same day. Our guide to choosing a solar installer covers these pitfalls.
VAT, grants and support in 2026
In 2026 there is no longer any direct regional grant for households buying solar panels, in Brussels, Wallonia or Flanders. The financial levers lie elsewhere:
- 6% VAT for private homes more than 10 years old, applicable to supply and installation by a contractor;
- green certificates in Brussels, awarded for 10 years based on output, which remain significant support for systems up to 5 kWp (see the new measures announced by Brussels Environment);
- self-consumption itself, which is now the main source of savings.
In Wallonia, new residential systems no longer receive green certificates. In Flanders, small residential systems no longer receive a subsidy either, and panels are not covered by Mijn VerbouwPremie; every new system has a digital meter that records imports and exports separately. Rules change regularly: see our energy grants page for an overview of your situation.
How long does it take to pay back?
The payback period depends on how much of your output you use yourself, on electricity prices and, in Brussels, on green certificates. As an order of magnitude, we often see:
- in Brussels, a payback of around 5 to 8 years for a system up to 5 kWp, thanks to green certificates;
- in Wallonia and Flanders, a payback often between 8 and 14 years, which varies widely depending on the share of electricity used directly.
The more electricity you use while the sun is shining (washing machine, dishwasher, water heater, car charging), the better the investment becomes. Panels last 25 to 30 years, and the inverter will usually need replacing once in that time: factor it into your calculation.
How to get a fair price for your project
The best way to find out what your system will cost is to compare several quotes drawn up after a site survey. At RhinoEnergy, an adviser calls you back within 24 working hours, reviews your consumption, your roof and the support you are entitled to, then puts you in touch with up to 3 certified installers in your area. The service is free with no obligation, and your data is never sold. You can request your quotes in a few minutes.
Frequently asked questions
What does a 4 kWp solar system cost in Belgium on average?
For a home more than 10 years old, you should generally budget between €5,000 and €6,800 including VAT, installation and inspection. The exact price depends on the roof, the equipment chosen and how easy the site is to access. Only a quote after a site survey can confirm it.
Do solar panels qualify for 6% VAT?
Yes, when the home is more than 10 years old, is mainly used as a private residence and the work is invoiced by a contractor. Otherwise, VAT is in principle 21%. This applies in all three regions, as VAT is a federal matter.
Is there a grant for solar panels in 2026?
There is no longer a direct regional purchase grant in Brussels, Wallonia or Flanders. In Brussels, green certificates remain significant support for 10 years. Rules change often: check your situation on our grants page or with your region.
Do I need planning permission for solar panels?
In the vast majority of cases, panels on the pitched roof of a house are exempt from planning permission. Specific rules may apply to listed buildings, protected areas or some flat roofs visible from the street: check with your municipality.
How long does a solar PV system last?
Panels generally last 25 to 30 years, with a performance guarantee that often covers 25 years. The inverter has a shorter lifespan, around 10 to 15 years, and will probably need replacing once.
