Price Guide
Humidity Treatment Price: How Much Does It Cost in 2026?
Published on January 10, 2026•Reading time: 8 min
Price by Type of Treatment
| Treatment | Price (incl. tax) | Unit | Warranty |
|---|---|---|---|
| Resin injection | 80-150€ | per linear meter | 10-30 years |
| Basement tanking | 150-300€ | per m² | 10 years |
| Peripheral drainage | 200-400€ | per linear meter | 20-30 years |
| Hygro-regulated VMC | 500-1500€ | installation package | 2-5 years |
| Facade water-repellent treatment | 15-35€ | per m² | 5-10 years |
| Waterproofing membrane | 40-80€ | per m² | 10-20 years |
| Pro dehumidifier | 300-2000€ | device purchase | 2-3 years |
* Prices observed in January 2026. May vary according to region and project complexity.
Factors Influencing the Price
The final cost of a humidity treatment depends on several criteria:
- Area to be treated – The larger the area, the lower the price per m² (economies of scale).
- Severity of the problem – Humidity that has been established for years requires more heavy work.
- Accessibility – A basement that is difficult to access or underground walls increase labor.
- Type of building – Old stone house vs recent concrete construction.
- Region – Prices vary by 15-20% between Paris and other regions.
Real Quote Examples
Detached house in Lyon
Rising damp, 25 lm of walls
Professional diagnosisFree
Hydrophobic resin injection (25 lm)2 875€
Renovation plaster1 200€
LaborIncluded
Total (incl. tax)4 075€
Apartment in Bordeaux
Condensation + mold, 65 m²
Hygro-regulated VMC type B890€
Anti-mold treatment (2 rooms)280€
Anti-humidity paint450€
Total (incl. tax)1 620€
Underground basement in Nantes
Infiltration, tanking 40 m²
Interior tanking (40 m²)8 400€
Interior drainage + sump pump2 800€
Basement VMC650€
Total (incl. tax)11 850€
Financial Aid Available in 2026
MaPrimeRénov'
- • Dual-flow VMC: up to 2 500€
- • Wall insulation: up to 25€/m²
- • Conditions: housing >15 years, RGE craftsman
Eco-PTZ
- • Zero-interest loan up to 50 000€
- • Duration: up to 20 years
- • Can be combined with MaPrimeRénov'
CEE (Energy Bonuses)
- • VMC: 100 to 400€
- • Insulation: 5-10€/m²
- • Can be combined with other aids
Reduced VAT 5.5%
- • On energy improvement works
- • Housing >2 years
- • Savings: ~15% on the bill
Beware of Scams
- • Be wary of very low quotes – An injection treatment at less than 50€/lm often hides poor quality.
- • Demand a written diagnosis – Any serious professional provides a detailed report before quoting.
- • Check warranties – A ten-year warranty is mandatory for structural work.
- • Compare at least 3 quotes – Differences can reach 40% for similar services.
Profitability: Not Treating Costs More
Delaying humidity treatment worsens the damage and increases the final bill:
- Degradation of the structure – Weakened walls, peeling paint, detached wallpaper. Average cost of repairs: +3 000€.
- Energy overconsumption – A damp wall loses up to 50% of its insulating power. Extra heating cost: 15-25%/year.
- Real estate depreciation – Damp housing sells for 10-15% less according to notaries.
- Health risks – Respiratory pathologies linked to humidity cost an average of 800€/year in care according to the OQAI.
« Early treatment costs on average 40% less than a late intervention on a humidity problem that has been established for several years. »
Sources et références
Cet article s'appuie sur des sources officielles et vérifiées pour garantir la fiabilité des informations.
- [1]Renovation work prices 2026— Quelle Énergie
- [2]
- [3]Work price observatory— Travaux.com
- [4]Energy renovation grants— ANAH
R
Rédaction ZeroHumi
Équipe éditoriale ZeroHumi
Documentation technique vérifiée à partir des sources citées (ADEME, ANSES, OMS, CSTB, CEREMA)