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“The weeping house”
Water ingress: how to find out where the water comes from
Water gets in from outside or from a pipe — through the roof, the terrace, a window or from the upstairs neighbour. The patch has a sharp edge and gets worse after rain.
Signs
- Yellow-brown patch with a sharp edge
- Worse 1–3 days after rain
- On the ceiling, near windows or under the terrace
- If it is the same in dry weather: possible plumbing leak
water coming from above
Most common causes
Broken roof tiles, worn terrace waterproofing, badly sealed window frames, leaking pipes inside the wall or in the neighbour's flat.
Treatments and observed prices
- Terrace waterproofing€28–45/m²
- Leak detectionfrom a few hundred €
- Roof repairneeds a site visit
Sources: Habitissimo, Zaask, cume.pt, customer reports. Collected on 02.10.2026.
Read next
Mould on the ceiling: condensation or water ingress?- Damp in a rented home: who pays, the landlord or the tenant?
- Damp coming from the upstairs neighbour: what to do
Written by the humidade.pt team · Reviewed by a civil engineer (to be confirmed) · Updated October 2026