Damp Treatment in Luxembourg: Solutions and Prices 2026
The Luxembourg climate, with annual rainfall of 800 to 1,000 mm and humid winters, encourages damp problems in buildings. Older houses, particularly numerous in historic towns such as Vianden, Echternach and Diekirch, are most affected.
Damp: a frequent problem in Luxembourg
The Luxembourg climate, with annual rainfall of 800 to 1,000 mm and humid winters, encourages damp problems in buildings. Older houses, particularly numerous in historic towns such as Vianden, Echternach and Diekirch, are most affected.
Untreated damp leads to serious consequences: mould (health hazard), material degradation (plaster, wood, paint), loss of thermal insulation and devaluation of the property.
Types of damp and their causes
Identifying the cause is essential to choose the right treatment:
- Rising damp: groundwater rises through walls by capillary action. Damp marks at the base of walls (up to 1.5 m high). Common in older houses without a damp-proof course.
- Condensation: warm air condenses on cold surfaces (glass, poorly insulated walls). Causes black mould and odours. Often linked to insufficient ventilation.
- Lateral water infiltration: rainwater penetrates through cracks in the facade, deteriorated mortar joints or waterproofing defects. Common on west-facing facades (prevailing winds).
- Roof infiltration: broken tiles, blocked gutters, defective flashings. Damage is often extensive before detection.
Damp treatment prices in Luxembourg
| Treatment | Average price (excl. VAT) | Application |
|---|---|---|
| Resin injection (rising damp) | €80 - €150/linear m | Load-bearing walls, wall base |
| Perimeter drainage | €150 - €300/linear m | Around the house, foundations |
| Tanking (basement) | €200 - €400/m² | Cellars, buried basements |
| Humidity-controlled ventilation (MVHR) | €3,000 - €6,000 | Whole-dwelling ventilation |
| Facade treatment (waterproofing) | €15 - €30/m² | Porous exterior walls |
| Damp diagnosis | €200 - €500 | Professional expertise |
Prices in Luxembourg are approximately 15-20% higher than in neighbouring countries. A professional diagnosis is recommended before any treatment to correctly identify the cause and avoid unnecessary works.
Resin injection: the most common treatment
For rising damp, hydrophobic resin injection is the most widespread solution:
- Drilling: holes of 12-14 mm are drilled every 10-15 cm at the base of the wall
- Injection: a silicone or acrylamide resin is injected under pressure
- Curing: the resin forms a waterproof barrier that prevents water from rising
- Duration: 1 to 3 days for a 10 linear metre wall
- Guarantee: 10 to 30 years depending on the product and company
After injection, you must wait 6 to 12 months for the wall to dry completely before redoing the plaster and paint.
Ventilation: essential against condensation
In well-insulated homes (double or triple glazing, high-performance insulation), lack of ventilation is the leading cause of condensation. Installing an MVHR (Mechanical Ventilation with Heat Recovery) system is often the solution:
- Simple humidity-controlled ventilation: €2,500 - €4,000 — adjusts airflow based on detected humidity
- MVHR (double-flow): €5,000 - €8,000 — recovers heat from outgoing air, ideal for high-performance homes
MVHR is particularly recommended in Luxembourg as it contributes to improving the CPE class.
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Dacks gestallte Froen
The three main causes are: rising damp (older houses without a damp-proof course), condensation (well-insulated but poorly ventilated homes) and lateral water infiltration (facades exposed to rain). The humid Luxembourg climate amplifies these problems.
Resin injection for rising damp costs €80 to €150/linear m. Perimeter drainage costs €150 to €300/linear m. A humidity-controlled ventilation system costs €3,000 to €6,000. A professional diagnosis costs €200 to €500.
Typical signs: damp marks at the base of walls (up to 1.5 m high), saltpetre (white powdery deposit), blistering paint, plaster coming away, musty smell. A professional diagnosis with hygrometric measurement confirms the diagnosis.
For new builds, mechanical ventilation is mandatory under Luxembourg standards. For renovations, it is not mandatory but strongly recommended, especially after window replacement (increased risk of condensation).
Donnéeë verifizéiert am Abrëll 2026