Condensation
Black mould spots in corners, around windows and behind wardrobes on outside walls. Worse in winter and with poor ventilation. Very common in older Madrid flats.
Rising damp
Tide marks and salt deposits at the bottom of walls in ground floors and semi-basements, caused by moisture from the ground.
Leaks
Localised stains below bathrooms, terraces or roofs that grow with rain or water use. The cause may be in a neighbour’s flat or communal pipes.
What to look for on a viewing
- Freshly painted patches.
- Musty smells masked by air fresheners.
- Furniture pushed against outside walls.
- Swollen skirting boards or floors.
Next step
Identifying the cause is key to the right repair. A home inspection in Madrid documents signs of damp room by room.
Ventilation habits
Many Madrid flats were built without mechanical ventilation. Opening windows briefly every day, using extractor fans and not drying laundry indoors makes a big difference to condensation.
Questions to ask the seller
- Have there been leaks from upstairs?
- When was the bathroom last resealed?
- Has the roof or terrace been waterproofed recently?
FAQ
Who pays for a leak from upstairs?
The neighbour or their insurance if it comes from their installation; the community if from shared elements.
Is mould dangerous?
It can affect people with allergies or breathing problems.
Does a dehumidifier fix it?
It helps with condensation but not with leaks or rising damp.
Spanish guide?
See humedades en casa.