Energy Renovation and Property Sales in Luxembourg 2026

In 2026, energy performance has become a decisive criterion for Luxembourg buyers. An energy certificate of class A or B can significantly increase your property's value.

Impact of Energy Class on Sale Price

• Class A-B: 15-20% premium over average
• Class C-D: market average
• Class E-F: 5-10% discount
• Class G-I: 15-25% discount

Most Cost-Effective Renovations

Thermal Insulation

• Roof insulation: €15,000 - €30,000 (highest ROI)
• External wall insulation: €20,000 - €50,000
• Floor insulation: €5,000 - €15,000

Window Replacement

Triple glazing: €800 to €1,500 per window.

Heating System

• Air-water heat pump: €15,000 - €25,000
• Geothermal heat pump: €25,000 - €45,000

PRIMe House Subsidies

Luxembourg offers generous grants through the PRIMe House program covering 30-50% of renovation costs.

FAQ

Is the energy certificate mandatory for selling in Luxembourg?

Yes, the energy performance certificate is mandatory for every property sale in Luxembourg.

Are energy renovations deductible from capital gains?

Yes, renovation works from the last 5 years can be deducted from the capital gains calculation.