The price of waterproofing varies a great deal with the system chosen and the prior condition of the surface, so giving a single figure without qualification can mislead both the professional and the client.
Guideline price per m²
As a market reference in Spain, waterproofing with paint or liquid membrane on a surface in good condition can run around €15–25/m²; with bituminous or PVC sheet, €25–40/m²; and more complex systems such as sprayed polyurea can exceed €40–60/m², depending on prior preparation and accessibility.
What factors push the price up
Surfaces with active damp that must be dried out before treatment, complex geometry (many junctions, joints, parapets), difficult access, and the need to remove a degraded earlier treatment before applying the new one are the factors that most increase the cost of a waterproofing job compared with the base rate.
Why a prior visit is wise before giving a fixed price
The real condition of the substrate (cracks, residual damp, adhesion of earlier treatments) is not always visible in photos, and giving a price without a visit can lead to falling short if a base problem appears once the work has started.
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