239 solar & energy installers in Luxembourg

Any grid-connected photovoltaic system must be installed by a company holding a business permit issued by the Ministry of the Economy for electrical installer or refrigeration-solar technician activities, depending on the work involved. Connection to the distribution network must go through the relevant grid operator, Creos in most municipalities, which validates commissioning and metering.

A declaration of the installation is required with the grid operator, and depending on the installed capacity, an electrical compliance inspection by an approved body may be required before commissioning. For a charging station, the electrical connection must also comply with current standards and is subject to inspection by an approved body, particularly if certain power thresholds are exceeded or the electrical panel needs upgrading.

A municipal declaration may be required for roof-mounted or ground-mounted panels depending on the municipality and visibility from public space, particularly in protected areas or for listed buildings. It is advisable to check this with the local urban planning office before starting work. Calling a professional is also essential as soon as work involves modifying the electrical panel, drilling through the roof, or working at height, since these are safety-critical tasks affecting both the building and the people working on it.

Warning signs for a homeowner include a sharply rising electricity bill despite stable consumption, plans to buy an electric vehicle without a home charging solution, or a well-oriented, unused roof while an energy passport is required for a sale or rental of the property.

The first contact with the company usually leads to an on-site technical visit, essential to assess roof orientation and pitch, the condition of the roof frame, access to the attic and the configuration of the electrical panel. This visit also checks available power at the meter and anticipates any need for upgrading.

Based on this, the installer proposes a sizing adapted to the household's consumption and a detailed quote covering materials, labour, connection and administrative steps. Once the quote is accepted, the company files the necessary applications with the grid operator and, where applicable, the municipality.

Mounting the panels and inverter typically takes one to three days for a standard residential installation, weather permitting. Installing a battery or charging station can be done in parallel or afterwards, taking half a day to a full day depending on the complexity of the electrical connection. Final connection and commissioning then depend on the grid operator's timelines, which can extend over several weeks depending on the period and administrative workload.

Project handover includes a functional check, delivery of compliance certificates and technical documents needed for subsidy applications and the energy passport. The client should prepare access to the roof and electrical panel, clear the attic if needed, and gather documents on electricity consumption to refine the sizing.

The cost of a solar installation first depends on its capacity, expressed in kilowatt-peak, and therefore on the number of panels installed. Roof surface and accessibility also matter: a complex, steeply pitched or hard-to-reach roof increases installation time and safety requirements.

The choice of equipment strongly influences the budget: panel technology and brand, inverter quality, and whether a storage battery is included all significantly affect the final price. A home battery represents a substantial additional investment, to be weighed against the targeted self-consumption rate.

The condition of the electrical panel and any need to upgrade it to accommodate new production or a charging station also has an impact. The distance between the production or charging point and the electrical panel, as well as wiring complexity, are additional factors.

Finally, connection fees charged by the grid operator, any inspection by an approved body, and administrative steps are part of the overall budget. These items vary from project to project and should be clearly itemised in the quote to allow a fair comparison between several offers.

The economic benefit of a photovoltaic installation depends heavily on the balance between self-consumption and grid export. Electricity used directly in the home saves the cost of grid electricity, while surplus exported to the grid is compensated under terms set by the grid operator. A higher self-consumption rate generally improves the return on the installation.

To increase self-consumption, it helps to shift energy-intensive appliances such as washing machines, dishwashers or the electric vehicle charger to periods of high solar output, typically during the day. Some control systems automate this by switching appliances on and off depending on available solar surplus.

A home battery shifts part of the energy produced during the day to the evening, when consumption is highest in many households. Whether this investment pays off depends on the household's consumption profile, electricity prices and the battery's own cost. A realistic assessment requires analysing the household's actual load profile over several months, not just an estimate based on the annual bill.

Payback periods for a solar installation vary depending on the investment amount, the self-consumption rate and how electricity prices evolve. A serious installer discloses the assumptions behind its calculations and avoids overly optimistic projections that may not match actual weather conditions and consumption habits.

Several public schemes support renewable energy and electric mobility projects in Luxembourg. The Klimabonus Wunnen, which replaced the former PRIMe House programme in 2022 and is managed by the State, covers certain investments related to renewable energy and energy renovation of the home, including works improving the building's energy performance.

Municipal subsidies also exist in several municipalities across the country, on top of state support, and sometimes specifically target photovoltaics, batteries or charging stations. The reduced 3 % VAT rate for housing may apply under conditions to certain works carried out in a home used as a main residence.

These schemes regularly change in terms of eligibility criteria and procedures. For up-to-date criteria and the steps to follow, consult the official sites guichet.lu, myenergy.lu and klima-agence.lu, which centralise current information on available support. A serious installer can generally point clients to these resources and provide the technical documents needed for an application, but the decision to grant support always rests with the relevant administration.

The first criterion is holding a business permit issued by the Ministry of the Economy, matching the activity performed: electrical installer, refrigeration technician or solar installer. This permit guarantees a recognised baseline of skills and professional responsibility in Luxembourg.

It is also essential to check that the company holds professional liability insurance covering the work carried out. A written, detailed quote specifying the equipment, its brand, capacity, labour and included administrative steps should always be requested before committing.

The warranties offered deserve particular attention: manufacturer warranty on panels and inverter, production guarantee, and, where relevant, a ten-year warranty on elements affecting roof waterproofing. Asking for references from similar projects recently completed in Luxembourg helps assess the company's seriousness and experience within the local regulatory context.

The company's responsiveness, and its ability to clearly answer technical questions and explain administrative steps, are also good indicators. An installer who takes the time to explain the chosen sizing and the reasoning behind technical choices inspires more confidence than a standardised offer. Comparing several quotes remains the best way to weigh price, equipment quality and the scope of warranties against each other.

Under-sizing or over-sizing the installation relative to the household's actual consumption is a common mistake, penalising either profitability or usage comfort. A sound sizing relies on a careful analysis of consumption habits, not just the available roof surface.

Neglecting the roof's condition before installing panels can lead to having to dismantle the system a few years later to redo the roof covering, with significant extra costs. It is preferable to check the condition of the roof frame and covering before any commitment.

Signing an incomplete quote, without detail on equipment, administrative steps or connection timelines, exposes you to unpleasant surprises. Likewise, ignoring the grid operator's real timelines for commissioning can significantly delay the expected return on investment.

Finally, forgetting to check compatibility between a future charging station and an existing photovoltaic installation, or vice versa, sometimes leads to poorly coordinated investments. Planning the home's overall energy project ahead of time, rather than treating each piece of equipment in isolation, helps optimise the overall budget.

Vert.lu is a lead-matching platform. You describe your project once, specifying the type of installation planned, your home and your goals. This request is then forwarded to companies in the energy and solar sector matching your profile and location.

You then receive quotes directly from companies interested in your project, and remain entirely free to choose the offer that suits you, or none at all. Vert.lu does not carry out any of the work and charges homeowners no fee for this service.

This approach saves time compared with an individual search for companies, while keeping full control over the final decision, the choice of equipment, and the contractual terms negotiated with the chosen company.

A photovoltaic installation requires little maintenance, but regular monitoring of production through the inverter's data allows an unexpected drop in yield to be spotted early, a possible sign of a faulty panel or significant soiling. Cleaning the panels can be useful in certain situations, particularly in dusty environments or after a long dry spell.

A home battery requires monitoring of its health over time, usually available through an app provided by the manufacturer. A charging station should undergo periodic electrical inspection, like other electrical equipment in the home, to guarantee safe use over time.

In the event of a sale or rental of the property, the energy passport must reflect the installation in place, including solar production where significant. It is therefore worth keeping all technical documents and certificates issued at handover, which will also be useful in case of a fault or an intervention by another professional on the installation. A maintenance contract is not strictly necessary for a recent photovoltaic installation, but it can reassure owners who want to fully delegate technical follow-up.

Before mounting any panels, the condition of the roof covering and frame should be checked, particularly for buildings whose roof has not been renewed in over twenty years. A solar installation has an expected service life of around 25 to 30 years; an early roof renovation during that period requires costly removal and reinstallation of the panels.

The roof structure must be able to bear the additional weight of the panels and mounting systems. For older roof frames or unusual constructions, a structural check by a specialist can be worthwhile before the installer begins mounting the panels.

Roof orientation and pitch significantly affect solar yield. A south-facing roof with a pitch between 30 and 40 degrees is generally considered optimal in Luxembourg, though east-west orientations can also make sense, particularly when they spread self-consumption across the day, producing electricity in the morning and evening rather than only around midday.