Mould from humidity in Lisbon flats: causes, fixes, and when to call professionals

Black spots on paint are easy to photograph, but they rarely tell the full story. In Lisbon, coastal humidity and indoor steam meet cold corners and weak airflow.

Repainting without fixing the moisture path usually means the mould comes back within a season.

Problem and practical fixes

Use extractors during and after showers; confirm ducts exhaust outside. Pull furniture slightly away from cold walls. Fix roof, sill, and pipe leaks before cosmetic coats.

• When cleaning alone stops working, the substrate or envelope needs attention.
• Anti-mould paint helps only after the source of damp is under control.
• Serious envelope work may need a specialist; we coordinate painting and plumbing repairs.

CASAFIXA

We handle painting and plumbing repairs with our own team in Greater Lisbon (no subcontractors). Quote requests are usually answered within about 24 hours.

Discovery and quote

Write to info@casafixa.com or contact us on WhatsApp (+351 928 387 170). Describe the renovation need you have in mind for your home; support it with photos and send them to us. You can attach more than one photo. That way we can respond faster and more accurately.