How do municipal grants for energy renovation work?

A municipal grant is an extra amount a commune pays from its own budget, on top of the state Klimabonus, for works carried out in the commune. There is no national scale: each municipal council votes its own regulation, which gives four ways of calculating the grant.

When the grant is a percentage, it follows the state grant. A heat pump ordered, or an approval in principle requested, before 30 June 2027 benefits from the state’s increase, and therefore from a higher commune grant: in Dudelange (25%), an air-to-water heat pump receives €3,000 from the commune with the increase and €2,500 without it.

The most common conditions, to check in your commune’s regulation:

• works eligible for the Klimabonus: most communes calculate their grant from the state decision, so a file rejected by the state then gets nothing from the commune either;
• a home located in the commune;
• an application filed with the commune, within the deadline and on the form set by the regulation;
• possible extra conditions: main residence, a cap per home or per period, a shorter list of items than the state’s.

The municipal regulation prevails: the Klima-Agence simulator gives the amount, not every condition. State amounts by type of work: 2026 grants and Klimabonus.

Commune grant, Klimabonus, Enoprimes and 3% VAT: what can be combined

The commune grant comes on top of the Klimabonus and does not replace it; in principle it can also be combined with the energy suppliers’ Enoprimes and the 3% VAT rate. For an air-to-water heat pump replacing an oil or gas boiler in a house, the layers stack up as follows:

Some municipal regulations limit total public grants to the cost of the works: check this if your grants come close to the invoice. Heat-pump bonuses (oil tank, radiators, water protection zone): heat pump grants; solar PV and batteries: 2026 solar panel grants; reduced-rate conditions: 3% VAT on renovation works.

2026 municipal grants: table of the 100 communes

On the map, each commune is shaded by its grant for the selected item; the table below gives every amount.

Map of 2026 municipal grants in Luxembourg

Item shown

Air-to-water heat pumpFacade insulation (100 m²)Solar PV (6 kWp)

Find my commune

Hover over or tap a commune, or search for it by name, to see its three grants and how they are calculated.

Commune grant for this item (standard project): Air-to-water heat pump

• €4,000 to €6,0004 communes
• €2,000 to €3,60028 communes
• €1,000 to €1,50030 communes
• €500 to €75022 communes
• On request from the commune11 communes
• No grant for this item5 communes

Commune grant for this item (standard project): Facade insulation (100 m²)

• €2,000 to €3,5009 communes
• €1,500 to €1,75019 communes
• €1,000 to €1,40019 communes
• €500 to €70040 communes
• On request from the commune8 communes
• No grant for this item5 communes

Commune grant for this item (standard project): Solar PV (6 kWp)

• €2,000 to €2,8718 communes
• €1,500 to €1,72313 communes
• €1,000 to €1,43644 communes
• €250 to €86128 communes
• On request from the commune6 communes
• No grant for this item1 commune

Every amount, commune by commune: table of the 100 communes.

This table shows, for each of Luxembourg’s 100 communes, the commune grant calculated on 28 September 2026 by the official Klima-Agence simulator for the same standard project, on top of the state Klimabonus shown in the first row. On mobile, scroll the table to the right.

Beyond the table, the simulator also calculates pellet boilers (grant in 80 communes, €300 to €4,000), solar thermal (92 communes, €250 to €1,250), cellar ceiling insulation (85 communes), heat-recovery ventilation (33 communes, €500 to €4,500), batteries (10 communes with an amount, 88 refer you to the commune) and charging points (26 communes, €120 to €600). Select your commune in the simulator to see them.

Which communes pay the most for an energy renovation?

For an air-to-water heat pump, Luxembourg City and Schifflange pay the most: €6,000, i.e. 50% of the state’s €12,000, with no cap. To insulate the facade and roof (2 × 100 m²), Luxembourg City, Manternach, Niederanven and Schifflange pay €7,000.

Top 10: air-to-water heat pump (commune grant)

Top 10: facade and roof insulation (200 m²)

Communes with no grant or “on request”

No commune is missing from the simulator: 98 calculate at least one item, and Bettembourg and Mondercange refer you to their administration for every item. The gaps concern specific items:

• Air-to-water heat pump: no commune grant in 5 communes (Biwer, Erpeldange, Junglinster, Koerich and Vichten), although Junglinster does support ground-source heat pumps; grant “on request” in 11 communes (Bettembourg, Bettendorf, Betzdorf, Diekirch, Grevenmacher, Hesperange, Lintgen, Mersch, Mondercange, Useldange and Wormeldange).
• Facade insulation: no grant in 5 communes (Leudelange, Sandweiler, Sanem, Steinfort and Vichten), on request in 8.
• Grants limited to a few items: Diekirch, Grevenmacher, Mersch, Sanem and Vichten calculate only 1 to 3 of the simulator’s 13 items.

Worked examples: state + commune + remaining cost in 4 communes

The same project in all four communes: a 1970s house replaces its oil boiler with an 8 to 12 kW air-to-water heat pump (€15,000 to €20,000 installed, 3% VAT included, per our heat pump cost page) and insulates 100 m² of facade from the outside with mineral wool (€150 to €220/m², i.e. €15,000 to €22,000, per our external wall insulation page). Order and approval in principle before 30 June 2027: the state pays €12,000 + €7,000 = €19,000. Total budget: €30,000 to €42,000.

• Luxembourg City: the City adds 50% of each state grant, i.e. €6,000 for the heat pump and €3,500 for the facade; grants cover 68% to 95% of the budget.
• Esch-sur-Alzette: the heat pump is capped at €750, but insulation receives 20% of the state grant (€1,400 for the facade); the city even pays 100% of the state grant for a cellar ceiling (€1,800 for 60 m²) and 50% for windows.
• Differdange: 50% of the state grant, capped at €5,000 for the heat pump; for facade insulation the simulator refers you to the commune, so the total above only counts the heat pump.
• Wincrange: the most common rule, 10% of the state grant (37 communes), with the heat pump capped at €1,200 and €700 for the facade.

Enoprimes not deducted: requested before ordering, they take a further €1,700 to €2,500 (plus the 2026 bonus) off the heat pump’s remaining cost. Beyond one element of the building envelope, energy advice is mandatory: it has its own state grant, and sometimes a commune grant (“Energy advice” column). Detailed budget for a full renovation: energy renovation costs.

How to apply for your commune’s grant

The commune grant is applied for at your municipal administration, usually once the state decision has been received, because most communes apply their percentage to the amount granted by the state. Five steps, in this order:

To find your commune’s rules: its website, the Klima-Agence grants simulator (select the commune, then the works) and Klima-Agence’s free advice line on 8002 11 90. For the Klimabonus itself, the Guichet unique des aides au logement answers on 80 02 10 10.

Method, source and limits of this survey

The amounts on this page come from the official Klima-Agence simulator (aides.klima-agence.lu), queried on 28 September 2026 for all 100 communes with the same standard project, with and without the state increase. The table is generated automatically from these results, with no manual entry.

• Checks: for each commune and item, the percentage is the same with and without the increase, the amount matches the simulator’s formula (percentage × state grant, flat amount, €/kWp or cap), and the increased grant is never lower than the base grant.
• Amounts used: with the state increase where it exists; solar PV, batteries, pellets, solar thermal and charging points without an increase.
• Limits: a commune can change its regulation at any time, and the simulator may lag behind; conditions (residence, deadline, cap per home or per year) are not modelled; “on request” means no amount is calculated online; the figures are for a house, not a flat.
• What prevails: the municipal regulation in force when you apply.

Estimate your works and grants

Before choosing your works, put a figure on them: the renov.lu simulator estimates the budget and state grants, and your commune’s row in the table gives the top-up. To move on to quotes, a single request gets you 3 offers from companies established in Luxembourg. Overview of the works and their payback: energy renovation guide.

Frequently asked questions about municipal grants in Luxembourg