Biohazard cleaning in Clapham, Battersea and Balham.

Biohazard cleaning is the controlled removal of blood, bodily fluids, decomposition residue, sewage and anything else biologically hazardous from a property, followed by disinfection of everything the contamination reached. It needs protective equipment, biocidal chemistry, and a waste route that ends at a licensed facility with paperwork to prove it.

A standard end of tenancy crew is the wrong call for this, and so is a general deep-clean team without the training. Most of them will say so on the phone. The teams we refer to arrive suited, seal the affected rooms before they start, and hand over documentation at the end that an insurer, a freeholder or a solicitor will accept.

Nearly everybody reading this has been told by somebody official that the property needs specialist cleaning: the police, a coroner's officer, an insurer, a managing agent or a landlord. If that is you, one form is enough. You will not have to tell the story twice to get a price.

Every team we refer works to a written sequence, from the first walk to the clearance certificate. Two points on it are fixed. One is the protective equipment. The other is the waste route: a business carrying waste away from a property has to be a registered carrier, and the duty of care under the Environmental Protection Act 1990 means the transfer paperwork has to be kept and produced on request. That is the line between this and a deep clean.

Arrival can be in a plain van. On a conversion or mansion-block job that matters, because the stairwell is shared and the neighbours are on the other side of a lath and plaster wall. Suits, respirators with the right filter, double gloves, eye protection and sealed boots go on before the door opens, and the contaminated zone is taped off before anything is cleaned.

Cleaning runs on biocidal and virucidal chemistry rather than domestic product, usually chlorine-based or peroxide-based depending on what is there. Anything porous that has taken up contamination comes out: carpet, underlay, soft furnishings, and in bad cases floorboards or plasterboard. It leaves as hazardous waste, consigned properly, not put in the communal bin store or a hire skip.

Hard surfaces are cleaned, disinfected and checked. Odour is treated with ozone or hydroxyl equipment, which breaks the smell down rather than putting fragrance over it. In a converted house the team will usually want access to the stairwell, and sometimes to the flat above or below, because smell travels the soil stack and the joist voids long before anyone opens a window.

The paperwork at the end is the part people forget to ask for. A clearance certificate plus the waste transfer or consignment notes is what an insurer, a freeholder, a buyer's solicitor or an Environmental Health officer at Wandsworth or Lambeth will want to see, and it is worth filing with the deeds or the tenancy record.

Ring a specialist cold and the first ten minutes go on describing the worst day of your year to a stranger who does not know you. Then you ask that stranger to price something they have not seen. Then you do it again for a second quote, and again for a third.

Come through us and you say it once. We brief the team before they call you, so they arrive at that conversation already knowing the scope, the access, the urgency and who else is involved. Somebody who has just lost a relative should not have to narrate it three times to find out what it costs.

We also know this patch. A garden flat off Bedford Road, a third-floor mansion flat on Prince of Wales Drive with no lift, and a managed tower at Nine Elms where everything goes in through a concierge are three different jobs before anyone opens a bottle of disinfectant. All three go in the brief.

It costs you nothing. You pay the specialist their own price and we are paid by them for the introduction, so there is no markup sitting on your quote. Before anyone visits we tell you which firm is coming and what we checked on them.

We do not carry out biohazard cleaning 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 biohazard cleaning: a vetted specialist team that covers South West London. Biohazard is the category where we check hardest before we refer anything: registration to carry hazardous waste, public liability cover, DBS status where the property is occupied, and a disposal route that produces paperwork at the end. 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.