Choosing the right installer makes all the difference in Liège (4000) : a valid RESCert certification, in-house technicians who don’t subcontract, written guarantees and a reachable after-sales service. Wendows ticks every box — free assessment scheduled within 48h, from the Cité Ardente to Angleur.
In Liège, many solar offers look alike on paper ; what changes everything is the installer behind them. Wendows is a RESCert-certified installer, accredited and insured, with a team of in-house technicians who know the rooftops of Liège — from the grand townhouses of Outremeuse to the cottages on the hills of Cointe.
No passing subcontractor : the same team carries out the assessment, the installation and the commissioning, and stays reachable for after-sales support. You get written guarantees (equipment, inverter, ten-year structural guarantee), liability insurance and a local point of contact — exactly what secures your subsidies, your certificates and your return on investment.
Choosing your installer in Liège — the criteriaLooking for the product and service first ? See our solar panels in Liège page. Our installer expertise also extends to Seraing, Herstal, Ans, Chaudfontaine and Visé, and towards Namur — same certification, same guarantees across the province.
Liège relies on subsidies from Wallonia. Most of these levers are only accessible if the installation is fitted by a certified installer : that’s why the installer is no minor detail.
Without a RESCert-certified installer, you risk losing access to subsidies and certificates. We handle the compliance of the file from start to finish, with no paperwork on your side.
For a home over 10 years old, VAT drops from 21% to 6% on supply and installation — applied correctly by a properly registered installer, straight onto your quote.
In Wallonia, the prosumer tariff applies to grid use. An expert installer sizes the system and self-consumption to reduce its impact on your bill.
The detail of the amounts, the prosumer tariff and the return on investment is on our solar panel price & profitability page. A certified installer gives you a realistic production figure before any signature.
A few recent references in Liège and its districts, all fitted by our in-house technicians — never a subcontractor. Every project stays handled by the same team for after-sales support.
6 kWp installation fitted by our internal team, subsidy file and compliance handled by us. Equipment and ten-year guarantees handed over in writing at commissioning.
Voir le chantier →Array of 14 panels on a pitched roof, micro-inverters to manage the shading on the hills. No subcontractor : assessment, installation and after-sales by the same technicians.
Voir le chantier →Hybrid installation ready for a battery, liability insurance and inverter warranty included. The client compared a low-cost offer : they chose real guarantees.
Voir le chantier →5.0/5 · 1verified reviews
« Devis clair, sans surprise, primes comprises. Un seul interlocuteur du début à la fin. Je recommande sans hésiter pour le photovoltaïque. »
From the full-black panel to the battery, an expert installer selects and guarantees each component to suit your roof and your consumption. Discover each range :
High-efficiency photovoltaic modules, fitted by our in-house technicians and covered by an equipment warranty. Discreet full-black aesthetics for Outremeuse and the hills.
Discover the panels →String inverters or micro-inverters to manage the shading on Liège rooftops, inverter warranty included. Hybrid solutions ready for a battery.
See the inverters →Store your surplus to use it in the evening and boost your self-consumption — a real lever against the Walloon prosumer tariff, installed and guaranteed.
Explore the batteries →First check the RESCert certification (with the number to back it up), then ask whether the fitters are in-house technicians or subcontractors. Next insist on written guarantees — equipment, inverter, ten-year structural guarantee — and the liability insurance certificate. Finally, make sure after-sales support is locally reachable. Wendows answers yes to every one of these points in Liège.
RESCert is the Belgian certification for installers of renewable energy systems. In Liège as across Wallonia, it often conditions access to subsidies and certificates, and guarantees that the installer masters the installation and safety standards. An installation fitted outside RESCert can cost you your subsidies : we are certified and the file is handled by us.
At a minimum : a warranty on the panels, a warranty on the inverter (often shorter, worth checking), a ten-year structural guarantee on the installation and public liability insurance. We hand these guarantees over in writing at commissioning, in Liège as anywhere else in the province. Be wary of low-cost offers that stay vague on these points.
No. The installation is carried out by our own in-house technicians, trained and certified, never by a passing subcontractor. The same team handles the assessment, the installation and the after-sales support : you keep a single responsible point of contact, which changes everything for any later adjustment or intervention.
Our after-sales support is local : because our technicians are in-house and based in the Liège region, they intervene quickly for an adjustment, a production check or a job under guarantee. You call Wendows directly, not an unreachable subcontractor. That’s one of the decisive advantages of a local certified installer over self-installation or low-cost offers.
Tell us your address and your project : our Liège team calls you back, presents its RESCert certification and its guarantees, then schedules the free solar assessment.