When you are arranging cleaning after a distressing incident, it can be difficult to judge what is necessary. The most useful quotation explains the proposed work in ordinary language and makes clear which decisions still depend on an assessment.

This guide concentrates on hiring biohazard cleaners. For broader checks on a business and its staff, see our guide to vetting a cleaning company.

1. Agree what the cleaning will include

Describe what happened, the postcode, the affected rooms and any known access restrictions. Explain whether an insurer, landlord, managing agent or executor is involved. Ask who has authority to approve the work and the removal of possessions.

Request a written scope that separates the following where relevant:

• Assessment: inspecting the affected area and identifying what cannot yet be seen.
• Cleaning and disinfection: which rooms, surfaces and materials will be treated.
• Material removal: whether flooring, underlay, furnishings or other affected items may need to be removed.
• Odour treatment: what source is being addressed and whether further investigation may be needed.
• Waste: packaging, collection, transport and disposal charges.
• Follow-up work: return visits, drying, repairs or reinstatement, if included.

Cleaning does not automatically include replacing flooring, redecorating or rebuilding damaged areas. Ask for exclusions in writing. If hidden contamination is discovered, agree how additional work will be explained, priced and authorised before it proceeds.

2. Ask about experience with your type of incident

A contractor experienced in routine cleaning may not have the same procedures as one undertaking after-death or sewage work. Ask what relevant training the attending team has completed, who supervises the job and how subcontractors are checked.

Useful questions include:

• How will you assess the risks and prevent contamination spreading into other rooms?
• Which materials might be unsuitable for cleaning and why?
• How will you select cleaning products and control exposure?
• How will you decide whether the agreed work is complete?

Ask for the relevant risk assessment and an explanation of the working method. HSE guidance covers assessing exposure to biological agents and hazardous substances. A safety-data sheet for a product is useful information, but does not replace an assessment of how it will be used on the job.

Check any claimed accreditation with its issuing organisation, including its scope and validity. Do not treat a membership badge as proof that every technician is qualified for every specialist task.

3. Check who will collect and receive the waste

Ask the contractor to identify the business transporting the waste, the proposed receiving facility and the records appropriate to the job. A separate waste contractor may handle collection; the cleaning business does not necessarily transport the waste itself.

In England, check carrier details on the Environment Agency public register. For work elsewhere in the UK, use the relevant national regulator and guidance. Carrier registration alone does not authorise every form of waste treatment or disposal.

Transfer notes and consignment notes are different

For non-hazardous business waste, a waste transfer note or equivalent record containing the required information is generally used. Hazardous waste movements generally require consignment documentation, subject to applicable exceptions. England’s guidance includes an exception for certain domestic hazardous-waste collections.

The correct documentation depends on the waste, who produced it, the movement and the UK nation involved. Do not assume every item removed during a biohazard clean has the same classification. Ask the contractor to explain which records apply and retain the records supplied.

A transfer or consignment record documents a waste movement; it is not, by itself, a guarantee that every later disposal step was lawful.

4. Check insurance, the total price and payment terms

Request current insurance evidence and confirm that the activities being quoted are covered. Ask about relevant exclusions and the policy limit. The certificate alone may not show all restrictions.

• Public liability: can cover certain third-party injury or property-damage claims, subject to the policy. It is not a promise that all damage or unsuccessful treatment will be paid for.
• Employers’ liability: generally required for employers, with limited exemptions.
• Professional indemnity: relates to certain claims arising from professional services or advice. Do not assume it is a blanket guarantee for cleaning workmanship.

A trading brand can legitimately differ from the legal company name. Ask the contractor to explain the connection so the quotation, invoice and insurance clearly identify the responsible business.

If you intend to claim on your own insurance, ask your insurer about cover, authorisation and evidence before committing to non-urgent work. The contractor’s policy and your property policy serve different purposes.

Compare the full payable price, including VAT where applicable, waste charges, travel, equipment hire and return visits. Read deposit, cancellation and additional-work terms. A cheaper quote may simply cover less work; compare the scope before deciding.

5. Agree belongings, discretion and the handover

Before work starts, identify any keepsakes, documents or other possessions that need individual discussion. Agree who can approve disposal and how items that cannot be safely retained will be recorded. Avoid promises that everything can be restored before an assessment.

Ask how keys, access, photographs and communication with occupants will be managed. If discretion matters, discuss vehicle arrangements and contact preferences in advance.

At handover, request a record of:

• The areas treated and the work completed.
• Items or materials removed, as agreed.
• Relevant waste documentation.
• Any inaccessible areas, limitations or outstanding work.
• Instructions about access, ventilation or further works, where relevant.
• A contact for concerns and the terms of any agreed follow-up.

Ask what a completion or sanitisation certificate actually records. Its title alone does not establish that a whole property is sterile or ready for every use.

If water damage is also involved, ask how cleaning, drying and repairs will be coordinated. Our guide to when to call professional cleaners after a flood explains the different stages.

Questions to ask before accepting the quote

1. Who is responsible for the contract, and who will attend?
2. What is included, excluded or dependent on inspection?
3. What training and insurance are relevant to this work?
4. Who will transport the waste and where will it go?
5. Who approves the removal of belongings and any extra charges?
6. What completion records and aftercare will I receive?

Pause if the contractor will not identify the responsible business, explain the waste route or provide a clear written scope. Ask for clarification before handing over keys or agreeing payment.

Frequently asked questions

Sources and further guidance

• HSE: preventing incidental exposure to infection at work
• HSE: COSHH and cleaners
• GOV.UK: waste transfer notes
• Environment Agency: hazardous-waste consignment guidance for England
• HSE: employers’ liability insurance
• Association of British Insurers: liability insurance