Complete guide to energy & renovation subsidies in Luxembourg

Which works are typically covered

National aid typically covers three families of works: the building envelope (insulating the roof, walls, floors, replacing windows), heating systems (in particular replacing a boiler with a heat pump or connecting to a district heating network), and certain technical installations such as solar panels, ventilation or charging point connections. Each measure has its own technical criteria, which determine eligibility independently of the price paid.

A single renovation project often combines several of these families: insulating before changing the heating system makes technical sense, since a heating system is sized differently depending on the building's heat losses. This is also why a prior energy consultation is useful before fixing the order of works.

Why the official sheet always prevails

The amounts, rates and caps of subsidies change with public decisions, and information copied onto a third-party site can quickly become inaccurate. The amounts in this guide were checked on 27 September 2026 against the official sheets, cited as sources; for any binding figure, guichet.lu remains the authoritative source at the time of your application.

This caution also protects your project: an amount quoted by a company or copied from an old article is never a commitment from the administration. Only the official sheet in force when the file is submitted determines what you are entitled to.

Combining measures without compromising eligibility

Combining several measures is generally possible, but requires respecting the order and conditions specific to each. Some national and communal aid can be combined, some cannot, and some national measures explicitly exclude combining with each other for the same item of works. Checking this before signing a quote avoids discovering afterwards that an expected aid does not apply.

Technical coherence matters as much as administrative coherence: a heat pump sized before roof insulation, or a solar installation fitted without considering a planned electric vehicle, can force the equipment to be revisited a few years later. A project thought through as a whole, even if carried out in several phases, limits this risk.

Checking eligibility before committing

Before signing a quote, it is worth checking three points: that the measure envisaged actually exists under the scheme in force, that the intended company holds the trade authorisation matching the works, and that the order of steps follows the applicable rules, in particular when prior approval is required before works start. Klima-Agence offers free, independent energy advice, useful for clarifying these three points before any financial commitment.

Our dedicated page on procedures and eligibility sets out how a file proceeds, the documents usually requested and the role of MyGuichet in submitting applications.

Finding an authorised company

Benefiting from most aid requires the works to be carried out by a company authorised for the trade concerned. Our directory lists companies by trade and area of activity in Luxembourg, with the public information available on their trade authorisation. Describe your project, compare the responses you receive, and always check that the quote matches the technical criteria of the measure you are targeting before signing.