What does an ImmoPass energy audit look like?
Explore a real energy audit performed on a house in Echternach. 8 areas analysed, costed action plan, subsidies identified.
Energy performance
83% consumption reduction
Current building condition
Original 1969 roof uninsulated, 2006 extension OK
Original walls uninsulated, 2006 extension insulated
2006 PVC double glazing — to be replaced with triple
No insulation observed during inspection
Buderus LOGANO GB125 boiler (2015) — functional
Produced by Buderus boiler — adequate
No mechanical ventilation system installed
No renewable energy installation
Recommended action plan
The architect defined 6 priority work phases, with estimated budgets and available subsidies.
Floor insulation
Sprayed polyurethane floor insulation (XPS 12cm + PUR 8cm)
Dual-flow ventilation
Zehnder Comfoair 350 installation — max 1 air change/h
Exterior wall insulation
External mineral wool insulation 16cm (R = 4.55 m²K/W)
Window replacement
Triple glazed wooden frames (Uw = 0.74 W/m²K)
Cellar ceiling insulation
Ceiling insulation from cellar / unheated space
Roof insulation
Internal mineral wool insulation 18cm (R = 5.14 m²K/W)
Budgets are indicative estimates. Subsidies are subject to change by the regional authorities.
What the audit revealed
Strengths
- Recent boiler (2015) still functional
- 2006 extension properly insulated
- PVC windows in good overall condition
- Quiet location in Echternach
- High potential for energy class improvement
Areas of concern
- No floor insulation — major thermal bridge
- Original roof (1969) completely uninsulated
- Original walls with no thermal insulation
- No mechanical ventilation system
- Current performance of 280 kWh/yr·m² (class H/I)
- No renewable energy installed
Auditor's conclusion
Marie Boell — Certified Energy Auditor"The building has considerable energy renovation potential. With a 6-step action plan totalling approximately €157,000, it is possible to go from 280 kWh/yr·m² to 49 kWh/yr·m² — a reduction of over 82%. Available subsidies (~€25,500) significantly reduce the net cost for the owner. A phased approach allows the investment to be spread over 5 to 10 years."
What this audit would have enabled
Plan a coherent renovation
A 6-step action plan with clear priorities, rather than a chaotic and costly approach.
Maximise available subsidies
€25,516 in identified subsidies — without the audit, some of these grants could have been missed or incorrectly applied for.
Budget before committing
Knowing the full renovation will cost ~€157,000 allows you to negotiate the purchase price or plan your financing.
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