A patch of mould behind a wardrobe or along a window reveal can look like a decorating job. For a landlord, it is a reason to investigate. If the moisture source is still active, the next coat of paint can hide the evidence until the problem returns, often after a tenant has moved in.
Start with the source of moisture
Look at where the mould is appearing and when it gets worse. Staining below a bathroom could point to a leak. A patch that worsens after rain might warrant checks on gutters, pointing or roof details. Mould at cold corners can be associated with condensation, particularly where insulation, heating or extraction is inadequate. Several causes can overlap, so treat these clues as starting points for an inspection.
If the property is occupied, acknowledge the report promptly, ask what the tenant has observed and arrange access. Let them know who will attend and when they can expect an update. The government guidance on damp and mould sets out how landlords can assess health risks and address the underlying cause.
Scope the remediation before you redecorate
Recurring or widespread growth, suspected contamination behind finishes, or mould following a leak may warrant a specialist assessment. Ask for a written scope that identifies the affected areas, any immediate safety measures, which materials can be cleaned or need replacing, and how the contractor will check that the work is complete. Restorations UK describes its approach on its mould remediation services page.
Agree who will fix the moisture source. On a leasehold flat that can mean involving the managing agent early, particularly if the defect involves a shared roof or pipework. Confirm who owns each job and keep the tenant informed while the parties coordinate access and repairs.
Close the job with evidence
Keep the tenant’s report, inspection findings, dated photographs and contractor records together. Before signing off decoration or setting a move-in date, check that the source has been addressed and the affected materials are ready for reinstatement. Arrange a follow-up check to catch any recurrence.
When assessing a purchase, put investigation, remedial work and drying time into the refurbishment budget where damp is suspected. A realistic allowance at purchase is easier to manage than an open-ended repair once a tenancy has started.