A question that is increasingly coming up in contractor conversations and on social housing procurement frameworks is whether there is now a mandated standard for how mould must be removed in the UK. The short answer is: not yet as a standalone law — but the legal and industry framework around mould remediation is tightening significantly, the existing COSHH duties that already apply to mould work are poorly understood and under-enforced, and the UK Centre for Mould Safety (UKCMS) Mould-Safe Code is rapidly becoming the de facto standard that housing associations and contractors are expected to demonstrate compliance with. This article explains where the law currently stands, what is coming, and what it means for equipment specification.
What the law currently says about mould removal
COSHH 2002 — mould as a biological agent
The Control of Substances Hazardous to Health Regulations 2002 classify mould as a biological agent. Depending on the species and the scale of contamination, mould in buildings can be classified as a Hazard Group 2 biological agent under COSHH — meaning it is capable of causing human disease and may be a hazard to employees. For cleaning and maintenance operatives carrying out mould remediation in social housing, healthcare settings, void properties and commercial buildings, COSHH 2002 already legally requires:
- A suitable and sufficient risk assessment of the biological hazard before work begins
- Appropriate engineering controls — H-Class extraction with H14 HEPA filtration is the correct specification for vacuum cleaning of mould-affected surfaces, preventing mould spores from being re-released into the working environment
- Appropriate PPE — minimum FFP2 respiratory protection, FFP3 in higher-risk situations
- Containment measures where contamination is significant — preventing spores spreading to unaffected areas
- Health surveillance where operatives are regularly exposed
The critical point is that these COSHH duties already exist and already apply. The problem identified by UKCMS and Indoor Air Aware is that they are poorly known and very poorly enforced in the mould remediation sector. An operative sent to wipe mould off a wall with a damp cloth and a spray — no PPE, no extraction, no containment — is working outside COSHH compliance regardless of whether they know it. See: COSHH Regulations 2002
Awaab's Law — timescales not method
Awaab's Law (the Social Housing (Regulation) Act 2023, in force October 2025) mandates the timescales within which social landlords must investigate and remedy damp and mould — 10 working days to investigate, 3 working days to provide a written summary, 5 working days to make safe in urgent cases, 24 hours for emergencies. What it does not currently mandate is the technical method by which mould must be removed. The Government guidance accompanying Awaab's Law describes best practice — diagnose the cause, engage a competent professional, follow up at least six weeks later — but this is guidance not a prescriptive technical standard.
Phase 2 of Awaab's Law takes effect 30 November 2026, extending the framework to additional hazard categories. Phase 3 is expected in 2027. See: Awaab's Law guidance
The existing legal framework — three layers
- Landlord and Tenant Act 1985 (s.11) — the baseline duty to keep structure and exterior in repair
- Homes (Fitness for Human Habitation) Act 2018 — closed the loophole where damp caused by poor original construction was not classed as disrepair; applies to both private and social tenancies
- Awaab's Law 2023 — the sharpest layer, with fixed investigation and remediation timescales for social landlords
The UK Centre for Mould Safety — Mould-Safe Code
The UK Centre for Mould Safety (UKCMS) — ukcms.org — is the organisation that is most actively developing the standard for mould remediation in the UK. UKCMS was established alongside Indoor Air Aware CIC, founded by Lisa Malyon after she was hospitalised with pneumonia caused by mould exposure in her own home. UKCMS has developed a Mould-Safe Code — five core rules and ten pillars of safe practice for remediation professionals — aligned with existing IICRC S520 standards. UKCMS also operates a national training academy and a directory of accredited practitioners.
UKCMS is not a government or regulatory body — it is an industry organisation. Its Mould-Safe Code is not currently statutory. However, it is becoming the benchmark against which housing associations, local authorities and responsible contractors are measuring their mould remediation work. UKCMS has called on government for new public health guidelines on safe mould removal — the direction of travel is toward statutory guidelines, but the timeline is not yet confirmed.
Ryszard Jankowski, Technical Director at UKCMS, sits on the expert panel of Indoor Air Aware alongside academics from Manchester University NHS Foundation Trust, UCL, the BRE and the World Health Organisation advisory network. This is not a fringe organisation — it is a serious, credible body with genuine clinical and academic backing pushing for standards that are long overdue.
Indoor Air Aware — the consumer and education dimension
Indoor Air Aware CIC (indoorairaware.co.uk) is the consumer-facing and education arm of the same network. Founded by Lisa Malyon, it provides free indoor air quality information, healthy home visits and education programmes for households, landlords and professionals. Its expert panel includes professors of medical mycology, WHO advisors, paediatric respiratory medicine consultants and building physics specialists.
The statistic that frames the whole indoor air quality conversation — indoor air pollution is 3.5 times worse than outdoor air pollution, and in the UK we spend 90 percent of our time indoors — is the foundation of Indoor Air Aware's campaign. For the cleaning and maintenance sector, this is both a public health argument and a commercial one: the equipment that controls what is in the air of the buildings people live and work in is not a luxury specification, it is a health necessity.
What this means for contractors right now
The practical position for cleaning and maintenance contractors carrying out mould remediation work in 2026 is:
- COSHH already applies — mould is a biological hazard, risk assessment and engineering controls including H-Class extraction are already a legal requirement. Not knowing this is not a defence.
- Awaab's Law is tightening the paper trail — social landlords must document investigation and remediation. Contractors whose work does not meet the standard will create a liability for their clients. Surface cleaning without addressing the moisture source will show up in the six-week follow-up inspection.
- UKCMS accreditation is becoming a differentiator — contractors who can demonstrate UKCMS Mould-Safe Code compliance will have an advantage in social housing framework tenders as housing associations start specifying it in their procurement requirements.
- H-Class extraction is the equipment baseline — for any mould remediation work under COSHH, H-Class extraction with H14 HEPA filtration and sealed Type H disposal is the correct specification. M-Class is not adequate for biological hazard work.
H-Class extraction for mould remediation
H-Class extraction at 99.995% prevents mould spores — typically 2 to 10 microns in diameter — from being exhausted back into the working environment during vacuuming of affected surfaces. This is the COSHH engineering control for operative protection and the correct specification for preventing cross-contamination to unaffected areas during remediation. Type H sealed disposal bags ensure that spore-laden dust is contained during bag change and disposal.
H-Class extraction hub → | Mould remediation how-to guide → | Awaab's Law guidance → | COSHH Regulations 2002 →
Further resources
- UK Centre for Mould Safety — ukcms.org
- Indoor Air Aware — indoorairaware.co.uk
- Indoor Air Quality Regulation 2027
- Biocide labelling and mould treatment chemical compliance
- V-TUF Knowledge Hub
- Choose the right machine for the job
Telephone: 01522 787978 for equipment specification advice for mould remediation contractors.
