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Mould remediation after water damage or flooding

Mould that shows up after a leak, flood or long-term moisture problem is a different job from the initial water extraction. This page covers remediation itself: containing and removing mould safely, not just drying out water.

  • Assessment of how far mould has spread behind walls, under flooring or in insulation
  • Containment of the affected area so spores do not spread to the rest of the house
  • Removal of contaminated drywall, insulation or flooring that cannot be salvaged
  • Air scrubbing and HEPA vacuuming as part of the cleanup
  • Clearance before any rebuild (drywall, flooring, trim) begins

This is a separate step from general water damage cleanup, and some companies split the two into distinct crews or subcontract mould work out. Ask directly whether mould remediation is handled in-house or referred out, since that affects both timeline and cost.

What it costs

Mould remediation is priced by the size of the affected area and how much material has to be removed and replaced, not just a flat callout fee. A small bathroom ceiling stain costs far less to remediate than mould that has spread through basement framing after a slow, unnoticed leak. Ask for a written scope showing what gets removed versus treated in place.

Top 3 by our score

Ranked from our published scoring of public Google reviews for water damage restoration service.

  1. 95
  2. 2. Direct Basement Waterproofing
    5.0★ · 320 reviews
    95
  3. 93

See the full ranking → · Browse all providers

FAQ

Is mould remediation covered by insurance?
It depends on the cause. Mould from a sudden, covered event like a burst pipe is often included, while mould from long-term neglect or a known leak that went unaddressed may not be.
How do I know if mould removal worked?
Ask for post-remediation clearance testing or a visual inspection confirming the area is dry and free of visible growth before you close up walls or install new flooring.
Can I just clean small mould spots myself?
Small surface mould on non-porous surfaces can sometimes be cleaned yourself, but anything behind walls, in insulation, or covering more than a small area is worth having assessed professionally.