Mould behind a wardrobe on an external wall | Homecode

What is known — and what is not

What the pattern may mean

• Growth largely follows the wardrobe outline on an external wall and the exposed wall is clearer. A cold surface plus restricted local air movement supports a condensation contribution. It does not prove that furniture position is the sole cause or that the wall is weather-tight. [1]
• The wall or wardrobe back is wet after rain, has a local brown stain or the problem is concentrated below an exterior defect. Penetrating damp should be investigated. Do not assume all black growth is condensation because furniture was present. [1]
• Windows run with water, other cold corners have mould, or the bedroom extractor/whole-home system is not operating normally. The room or dwelling may have a wider moisture-removal, heating or ventilation issue. Changing one vent or buying a dehumidifier does not diagnose system performance. [2]
• The wardrobe back, clothes or stored paper smell musty or show growth. The affected area extends beyond the wall and porous contents need a controlled plan. Do not shake, brush or carry contaminated items through occupied rooms. [1]

What you can check without disturbing it

• Photograph visible wall edges, the room layout and any unaffected side of the furniture before it is moved. Boundary: Do not squeeze behind furniture or touch mould to obtain a better image. [1]
• Record health concerns and seek healthcare advice for symptoms without delaying the property report. Boundary: Do not identify safety or species from colour, area or a home test. [1]
• Record visible extent, odour, recurrence and any affected contents from the accessible side without moving furniture or belongings. Boundary: Do not touch growth or move musty, damp or visibly affected items. [1]
• Record normal heating, window-condensation and existing ventilation operation without changing the system. Boundary: Do not alter, block, dismantle or operate controls solely to test a cause. [2]

When to stop and escalate

• Do not dry-brush, sand or vacuum the wall or furniture. Disturbance can spread spores and contaminated dust. [1]
• Do not drag visibly mouldy furniture through the home. A controlled removal and cleaning or disposal plan may be needed for porous material. [1]
• Do not treat furniture placement as the complete diagnosis. Cold fabric, heating, ventilation and external defects may all contribute. [1]

Who to contact and what to ask for

• Follow the professional route in the safety block. When growth is persistent, extensive, affects porous contents or cannot be inspected without disturbance. [1]
• Ask for a written diagnosis that states the evidence, alternatives, repair scope, drying or follow-up plan and quote exclusions before spending. [1]
• After diagnosis, obtain comparable itemised quotes for the confirmed source repair and necessary reinstatement.

Sale and letting impact

• Hidden mould discovered during viewings or a survey can undermine confidence, especially if furniture was used to conceal it. Keep evidence of source diagnosis, remediation and follow-up rather than simply replacing the wardrobe. [3]
• In England, landlords should consider occupant vulnerability and investigate the underlying housing conditions. Advice about furniture position may help but is not a substitute for repairing defects or inadequate ventilation. [1]

Mould cleanup safety boundary

• GOV.UK says simply removing surface mould will not prevent it returning. Identify and tackle the moisture source first. Occupier cleaning is not a substitute for that assessment. [1]
• Photograph the affected area before cleaning. GOV.UK says mould should not be left for long periods, but the priority is still to protect health and fix the cause. [1]
• Most people could reasonably remove condensation and very small amounts of mould with an appropriate mould and mildew cleaner. Larger areas should only be addressed by qualified professionals. Official UK guidance does not publish a numeric area threshold. [1]
• Regardless of extent, wear a mask, gloves and goggles. Shut doors to other rooms and leave windows open during and after cleaning. Prefer a mould and mildew product to bleach. Wash or dispose of cloths and protective equipment afterwards. [1]
• Do not dry-brush, sand, scrape or vacuum mould. Disturbing hidden mould behind wallpaper, under carpets or inside voids can release a significant number of spores; seek a trained professional if you have concerns. [1]
• People with lung or heart disease, a weakened immune system, children and other groups listed in the GOV.UK guidance are at greater health risk. Anyone concerned about symptoms should consult a healthcare professional. Property action should not wait for medical evidence. [1]