Severe mould removal in Clapham, Battersea and Balham.

Severe mould removal is remediation rather than cleaning. Light surface mould on tile grout, sealant and window reveals is part of a normal end of tenancy clean and we do that ourselves. This page is for mould that has gone into the plaster, spread across a wall or a ceiling, taken hold behind fitted furniture or inside a void, or come back within weeks of being wiped off.

Black mould gets the searches, and stachybotrys is a real species, but it is not the only one that matters and not every dark patch is it. Different species want different chemistry, so a team that identifies what it is looking at before it treats is doing the job properly.

Mould is a moisture problem wearing a costume. Around here the moisture usually comes from the building: solid brick walls with no cavity, a bathroom carved out of a box room during a conversion with a fan ducted into a roof void, cold bridging where the back addition meets the main wall, sash windows with no trickle vents, and a lot of washing dried indoors from October onwards. Take the mould off without finding that, and it is back by February.

Remediation runs through identification, containment, removal, treatment and cause. Skip the last of those and you have bought yourself twelve months.

Identification comes first: which species, how far it has travelled, and whether it is sitting on the surface or inside the material. A sample is sometimes taken. That is what sets the chemistry and the scope of everything after it.

Containment keeps the rest of the property out of it. The affected room is sheeted and taped, and HEPA-filtered air scrubbers run while the work is going on so that disturbed spores are captured rather than carried into the hallway. In a one-corridor flat with no second route out, that is not optional.

Removal is where the honesty happens. Surface mould is treated with antifungal chemistry. Mould that has gone through the plaster, the plasterboard, the sealant or the timber comes out with the material, because no product pulls mould back out of saturated plasterboard. Anyone who says otherwise is selling you next winter's callout.

Treatment then goes onto the substrate that is left. It is a different product to the cleaning agent, applied and left to dry rather than wiped off, so that anything remaining does not regrow.

The cause assessment decides whether you ever see it again. Condensation, a failed sealant line, a leaking soil stack, cold bridging, an extract fan ducted into a roof void, blocked or missing trickle vents. What comes out of it might be a fan upgrade, a leak repair, insulation or a ventilation change, and it may or may not be the same team that carries that out. The water here is hard, and scale on shower trays and sealant lines gives mould something to hold onto, so descaling is part of a proper finish.

This is the category where the gap between two prices tells you least about which is better value. A team that treats what it can see is gone in a day and back in your inbox next winter. A team that finds the source costs more up front and ends the problem.

So we brief that difference in. We tell the team what the photographs show, what has been tried, how long it has been going on, and whether there is a licence condition, a written complaint or a health issue in the file. They arrive knowing whether they are pricing a wipe or a rebuild.

We also know what these buildings do. Victorian and Edwardian conversions across SW4, SW11 and SW12 fail in the same handful of places: the back addition return, the rear bathroom, the flank wall on the weather side, the top flat under a parapet gutter. A team that has never worked on this stock spends the first hour learning it at your expense.

It costs you nothing to come through us. The team quotes you direct and we are paid by them for the introduction. We name the firm and tell you what we checked before they visit.

We do not carry out severe mould removal ourselves, and we will not pretend otherwise. We refer it to vetted specialist teams who cover South West London and travel. Which team gets the job depends on what the case actually needs, who can be at the property in the window you have, and whether anyone is living there.

Lead specialist for severe mould removal: a vetted specialist team that covers South West London. Mould goes to a team we have checked on method rather than price: species identification before treatment, containment and HEPA scrubbing as standard, and a written cause assessment rather than a spray and a promise. We check insurance, waste licensing and, where the property is occupied, DBS status, and we tell you the firm and what we checked before anyone attends.

Also available: a second vetted team on the same checks and a travelling specialist team. Used when the first team is committed elsewhere, or when the job needs a bigger crew or a longer run of days. Used where a job needs certification, equipment or capacity that the South West London teams do not hold.

You don't pick the team yourself. On our call after you submit the form we match your case to the right one, tell you who it is and what we checked, and hand over the brief. You pay them directly. We never add a markup.