The damp proofing cost varies a great deal from one situation to another, which makes comparison difficult. Depending on the cause, the method and the surface involved, the bill can range from a few hundred to several thousand euros. Here are the ranges actually seen on the market and the factors that make the quote go up or down.

What makes the damp proofing cost vary

Before comparing figures, you need to understand what weighs on the quote.

• the cause of the damp: condensation, infiltration, leak or rising damp;
• the method chosen and the scale of the work;
• the number of metres of wall or the surface to be treated;
• the thickness and nature of the walls, access to the site and the region.

Prices of the main methods

As a guide, here are the damp proofing cost ranges generally seen for the most common methods.

• resin injection: about 40 to 150 euros per linear metre;
• perimeter drainage: about 100 to 200 euros per linear metre;
• tanking a cellar: a job that often reaches several thousand euros;
• drying device using polarity inversion: a one-off cost for the device, with very low electricity use.

Beware of inflated quotes

On the same wall, the damp proofing cost can vary by a factor of three depending on the company. A very high quote is not always a sign of better effectiveness. Before signing, ask for several detailed quotes, insist that the cause be clearly identified, and be wary of a paid diagnosis presented as compulsory or of pressure to sign quickly.

Paying the fair price

For rising damp, a polarity inversion device keeps the damp proofing cost to a one-off purchase, often lower than a job billed across the whole length of wall. At Humidistop, the ATE and ATG units are sold at direct factory price, with no middleman, and advice is given from photos, with no diagnosis billed at your home. You know what you are paying, with no surprises.

Frequently asked questions

Is a more expensive treatment more effective?

Not necessarily. Effectiveness depends above all on the right diagnosis and a method suited to the cause. A well-targeted, cheaper treatment is worth more than a heavy job that does not solve the real problem.

Should the quote be paid for?

A quote is normally free. An in-depth diagnosis may be charged in complex cases, but it must be clearly announced in advance, never imposed as a condition for getting advice.

Going further

To choose the right method for your case, read our comparison of damp wall treatment, or see how to choose a damp proofing device. Sharing a few photos of your walls is often enough to point you towards the most suitable option for your budget. You can also ask for a free opinion through the contact page.