Severe mould removal across Canary Wharf.

Severe mould removal is the specialist treatment of mould that has spread beyond a surface issue. Standard end of tenancy cleans handle light surface mould on tile grout, sealant, and windowsills. This page is for the cases where mould has gone deeper: into plaster, behind furniture, across whole walls or ceilings, or wherever it keeps coming back after cleaning.

Black mould (often stachybotrys chartarum) is the most-searched-for category but it isn't the only one that matters. Several mould species can grow in UK properties and they require different treatments. A specialist who identifies the species before treating is doing the work properly.

Mould is almost always a symptom of a moisture problem. Removing the visible mould without finding and fixing the source is a temporary fix. Proper mould remediation includes root-cause assessment so the mould does not return.

Those five words are the whole method, in order, and skipping any of them is how mould jobs fail.

Identification: the specialist looks at the mould (sometimes takes a sample) to determine the species and the extent. This matters because different mould species need different chemistry, and surface-level mould needs a different approach to mould that has gone into the building fabric.

Containment: the affected zone is sealed off (plastic sheeting, taped seams) so spores don't travel through the property during the work. HEPA-filtered air scrubbers run during the work to capture airborne spores at the same time.

Removal: surface mould is cleaned with antifungal chemistry. Mould that has penetrated plaster, plasterboard, sealant, or wood is removed with the affected material. There is no chemical that 'cleans' mould out of saturated plasterboard; the plasterboard has to come out.

Treatment: antifungal treatment is applied to the substrate (the structure under what was removed) so any spores left behind don't regrow. The treatment is a different chemical to the cleaning agent and is left to dry rather than wiped off.

Root-cause assessment: the specialist identifies why the mould grew in the first place. Condensation? Leak? Cold-bridging? Inadequate ventilation? Without fixing the source, the mould will return. The assessment can lead to recommended work (extractor fan upgrade, leak repair, insulation, ventilation review) which may or may not be done by the same team.

Mould remediation is a category where the difference between specialists matters a lot. A team that only treats the visible mould will leave the source untouched and the mould will be back. A team that does full remediation including root-cause assessment costs more up front but actually solves it.

We've watched the specialists in our network do this work for years. We know which one understands root-cause work versus which one is faster for a surface-level case. The triage matters more here than in some other categories.

If you call a mould specialist directly, you may get a quote for a quick fix that does not address why the mould grew. Coming through us means we brief the specialist on the situation, including any landlord or Ombudsman context, and they arrive prepared.

The introduction costs you nothing; the specialist settles with us separately once the job is done.

It surprises people that a modern, insulated, double-glazed tower flat gets mould worse than a draughty Victorian terrace. The physics is straightforward: mould needs moisture, and modern flats are sealed well enough that the moisture a household produces (cooking, showers, breathing, laundry) stays inside unless ventilation actively removes it.

The pattern the remediation teams see again and again around the Wharf: bathrooms with no window relying on a small extractor that has quietly failed or been switched off for noise; clothes dried on radiators in winter with the trickle vents closed; furniture pushed hard against an external wall so air never moves behind it; and winter gardens or enclosed balconies where warm moist air meets cold glass every night and condenses.

That is why root-cause assessment is not an upsell in this housing stock. The fix is often unglamorous: recommission the extractor, open the trickle vents, pull the bed 2 inches off the wall, dry laundry differently. The remediation clears what has grown; those habits and fixes decide whether it comes back.

The cheap end of this market washes the wall and paints over it with a stain-block, and six weeks later the tenant sends the same photo again. The teams behind this page are chosen because they work the full method: species, containment, removal, substrate treatment and the moisture source, in that order.

For severe mould we connect you with a vetted specialist team that covers the Docklands and travels to the job. Mould removal is among their core services and they handle severe cases as a regular part of their work.

Case allocation happens on our call, and from the assessment onward the relationship and the invoice run directly between you and the remediation team.