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Simulateur de Rénovation Énergétique

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Renov.lu Guide · Luxembourg Updated — July 2026

Energy renovation in Luxembourg: price, Klimabonus grants and savings in 2026

The Renov.lu energy-renovation simulator estimates the cost of works (insulation, windows, ventilation, heat pump, solar), the 2026 Klimabonus grants, municipal aid and your home's energy savings. Here are the reference figures used in Luxembourg.

Price of the main energy-renovation works

Indicative prices for insulation and heating works (Luxembourg, 2026)
WorksIndicative price
External wall insulation (ETICS)€180 – €280/m²
Roof insulation€60 – €150/m²
Internal wall insulation€60 – €110/m²
Floor / basement insulation€50 – €110/m²
Window replacement€900 – €2,200 / window
Heat-recovery ventilation (HRV)€105 – €120/m²
Air-to-water heat pump€18,000 – €28,000
Solar panels≈ €2,200/kWp

Klimabonus 2026 grants for energy renovation

Main Klimabonus grants in Luxembourg, 2026
MeasureState aid
External wall insulation (ETICS)up to ~€142/m²
Roof insulationup to ~€142/m²
Internal wall insulationup to ~€101/m²
Heat-recovery ventilation (HRV)min(area × 60 ; €9,000) + €6/m²
Air-to-water heat pumpup to €15,000
Energy advice / audit€3,250
Complementary municipal grantsup to +25% of State aid
Example: insulating 100 m² of façade externally costs about €22,000 (balanced scenario). The Klimabonus grant can reach ~€9,700, on top of which municipal grants add up to +25% of the State aid.

How the simulator works

  1. Describe your home: type, floor area, build year, current insulation and heating.
  2. Choose your works and an ambition level (mini, balanced or maxi).
  3. Get your estimate: cost, 2026 Klimabonus grants, energy savings, payback and a free PDF report.

Frequently asked questions

How much does an energy renovation cost in Luxembourg in 2026?

It depends on the works: façade insulation costs €180 to €280/m², roof €60 to €150/m². A full package usually ranges from €30,000 to €80,000 before grants.

What Klimabonus grants apply to energy renovation in 2026?

Insulation is funded up to ~€142/m², an air-to-water heat pump up to €15,000, energy advice €3,250, and municipal grants add up to +25% of the State aid.

Where should I start an energy renovation?

With energy advice (funded €3,250), then insulation (roof and façade first), and finally replacing the heating with a heat pump.

Is energy advice mandatory?

Approved energy advice is required to claim Klimabonus grants on insulation and heating works; it is itself subsidised by €3,250.

External (ETICS) or internal wall insulation?

ETICS performs better as it removes thermal bridges but costs more (€180 – €280/m²). Internal insulation is cheaper (€60 – €110/m²) but slightly reduces living space.

What energy savings can I expect?

Insulation sharply cuts heating demand (kWh/m²/yr). The simulator estimates the drop in consumption and the annual saving for the chosen works.

Should I insulate before installing a heat pump?

Yes. Good insulation raises the heat pump SCOP and allows a smaller, cheaper unit.

Learn more: energy renovation guide · Klimabonus grants · cost · where to start

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