When a commercial building achieves a BREEAM Outstanding rating or earns WELL Certification, the conversation tends to centre on the architects, the mechanical engineers, the sustainability consultants, and the forward-thinking developer who commissioned the whole endeavour. Fair enough – these are the people who specified the triple-glazed facades, designed the greywater recycling systems, and sweated over energy performance modelling at eleven o’clock on a Thursday night.
What that conversation rarely includes is the cleaning contractor. Which is more than a little ironic, given that commercial cleaning has a direct, measurable, and ongoing influence on a building’s ability to achieve and – crucially – maintain both BREEAM and WELL credentials. The green plaque by the entrance lobby is not a one-time achievement sealed in amber. It is a standard that must be upheld through every operational decision made in the building, including the ones involving mops, chemicals, vacuum cleaners, and waste segregation.
This article examines where commercial cleaning sits within both frameworks, which specific credits and criteria it influences, and what a cleaning programme genuinely designed around certification compliance looks like in practice.
What BREEAM and WELL Actually Are – and Why Cleaning Features in Both
BREEAM – The Building’s Environmental Report Card
BREEAM – the Building Research Establishment Environmental Assessment Method – is the world’s longest-established method of assessing, rating, and certifying the sustainability of buildings. Developed by the BRE Group in the UK and now applied globally, it evaluates buildings across categories including energy, water, materials, waste, land use, ecology, and health and wellbeing. Ratings run from Pass through Good, Very Good, and Excellent, to the coveted Outstanding – and they are increasingly specified as a baseline requirement by major commercial developers, public sector commissioners, and corporate occupiers with ESG commitments to honour.
Critically, BREEAM assessments apply not just at design and construction stage but to buildings already in operation through the BREEAM In-Use scheme. This is the version most directly relevant to the day-to-day running of a building and, by extension, to the cleaning operation within it.
WELL – When the Focus Shifts to the People Inside
The WELL Building Standard takes a different but complementary approach. Developed by the International WELL Building Institute, WELL is specifically concerned with the health and wellbeing of building occupants rather than environmental performance in isolation. It evaluates across ten concepts: Air, Water, Nourishment, Light, Movement, Thermal Comfort, Sound, Materials, Mind, and Community.
Several of these – most directly Air and Materials – carry significant and specific implications for commercial cleaning. WELL treats the indoor environment as a health environment, and anything that introduces pollutants, irritants, or chemical residues into that environment is, by definition, a WELL concern. A cleaning operation, which by its nature involves chemical products, mechanical agitation of surfaces, and the management of airborne particulate matter, sits squarely within scope.
Indoor Air Quality – The Certification Credit Cleaning Influences Most Directly
VOCs, Cleaning Chemicals, and the Chemistry of Compliance
Both BREEAM and WELL place significant weight on indoor air quality, and both frameworks identify cleaning products as a potential source of degradation. Volatile organic compounds (VOCs) emitted by conventional cleaning chemicals – solvents, fragranced products, aerosol sprays, and certain disinfectants – contribute to elevated indoor VOC concentrations that WELL’s Air concept specifically seeks to limit.
Under WELL, cleaning products used in certified buildings are expected to meet low-VOC thresholds and, in many specifications, recognised third-party certification standards such as EU Ecolabel or Nordic Swan equivalents. This is not a vague aspiration – it is a product selection requirement with documentation obligations attached. A cleaning contractor introducing non-compliant chemicals into a WELL-certified building is not simply making a suboptimal choice; they are actively undermining a certification the building’s owner and occupiers have invested considerably in achieving.
Particulate Management and the Case for HEPA-Standard Cleaning
WELL’s Air concept also addresses airborne particulate matter within the occupied environment, with specific reference to PM2.5 and PM10 concentrations. Cleaning activity – if carried out with substandard equipment – can temporarily elevate particulate levels through surface agitation, particularly on carpet tiles and upholstered furniture. The use of HEPA-filtered vacuum cleaners at H13 class minimum is therefore not merely best practice in a WELL-certified building; it is a functional requirement for maintaining the air quality standard the certification defines.
BREEAM’s Health and Wellbeing category similarly credits buildings that demonstrate effective indoor air quality management through operational practice, including cleaning. The equipment specification matters, and so does cleaning sequence – dry particulate removal before wet cleaning, not the reverse.
Waste, Chemicals, and What “Green Cleaning” Actually Means
The Waste Credits a Cleaning Programme Can Win or Lose
BREEAM’s Waste category credits buildings that demonstrate robust waste management practices, including segregation, recycling performance, and minimisation of material sent to landfill. The cleaning operation is a material contributor to a building’s waste stream: packaging from chemical supplies, disposable materials, used PPE, and the management of hazardous waste from chemical concentrates all fall within scope.
A cleaning programme aligned with BREEAM requirements will use concentrated, dilution-controlled chemical systems that minimise packaging waste, maintain clear and auditable waste segregation practices, and demonstrate a documented preference for reusable materials over single-use alternatives. Microfibre cloths over disposable wipes is the most straightforward example. None of this requires radical operational change, but it does require deliberate programme design rather than default procurement habits.
Chemical Reduction, Dilution Control, and Greenwashing the Mop Bucket
It is worth being direct about something the sustainability industry occasionally skirts around: attaching an Ecolabel to a product does not automatically make a cleaning operation green. Genuinely sustainable cleaning practice requires reduced chemical volume overall, not merely the substitution of one labelled product for another. Dilution control systems – wall-mounted dispensing units that mix concentrates to precise ratios – are among the most effective tools available here, reducing both chemical consumption and the risk of over-dosing that paradoxically increases VOC output and surface residue.
Under both BREEAM and WELL, the evidence required is not a list of compliant products. It is a documented cleaning programme demonstrating reduced chemical inputs, controlled dilution, and measurable reduction in chemical waste – a standard that demands genuine operational commitment rather than a green-tinged rebrand of business as usual.
Water Efficiency and the Cleaning Operation
Consumption Monitoring and the Documentation Certifiers Expect
Water efficiency features prominently in the BREEAM Water category, and while headline credits tend to go to low-flow sanitaryware and greywater systems, a cleaning operation’s water consumption is a monitored variable in any well-managed certified building. Sub-metering of water use by building function – including cleaning activity – is increasingly standard in BREEAM Excellent and Outstanding buildings, and facilities managers are expected to produce consumption data on request.
A cleaning contractor operating in this context needs to maintain records of water use associated with their activities and demonstrate awareness of consumption reduction practices – a discipline that is straightforward to embed but requires it to be treated as a standing operational responsibility rather than an afterthought.
Low-Water Methodologies and Why Microfibre Earns Its Place Again
Spray-and-wipe methodology using microfibre – rather than bucket-and-mop approaches that consume and discard significant water volumes per session – is the most practically impactful water reduction tool available in day-to-day commercial cleaning. The combination of electrostatic particle capture and capillary absorption means microfibre systems clean effectively with dramatically less water, and in buildings where water efficiency is a scored metric, the cumulative difference across a year of cleaning activity is not trivial.
Flat mop systems with pre-dampened pads take this further, offering controlled moisture application with no standing water in the process – an approach that simultaneously addresses water efficiency, slip risk, and drying time in occupied commercial spaces.
The Documentation Imperative – Evidence, Audits, and Ongoing Compliance
What Assessors Actually Want to See
BREEAM and WELL assessors do not take operational claims on trust, and nor should they. Documentation expected from a building’s cleaning operation in support of a certification assessment or renewal typically includes: a written cleaning specification referencing compliant products and methodologies; safety data sheets and environmental product declarations for all chemicals in use; records of staff training on sustainable cleaning practices; waste management logs with segregation and recycling data; and equipment specifications confirming HEPA filtration class.
None of this is onerous to maintain if the cleaning programme is designed around compliance from the outset. It becomes very onerous indeed if assembled retrospectively in the fortnight before an assessment visit.
Cleaning Contractors as Compliance Partners, Not Just Service Providers
This is perhaps the most significant shift that BREEAM and WELL certification requires of the relationship between building managers and cleaning contractors. In a certified building, the cleaning contractor is not simply a vendor delivering a service to a specification – they are an operational partner whose practices carry direct consequences for the building’s certification standing.
Procurement decisions that prioritise day rate over demonstrated sustainability credentials carry a hidden cost that only becomes visible when an assessor asks for the HEPA filter class on the vacuum cleaner and receives a blank look in response. The most effective cleaning programmes in London’s certified commercial buildings involve the contractor in sustainability planning from the outset – not consulted after the specification has been written, but contributing to it.
WELL Done – Now Keep Earning It
Achieving BREEAM or WELL certification is a significant undertaking. The design decisions, systems engineering, commissioning process, and assessment itself represent a substantial collective investment. What is less often acknowledged is that the certification does not bank itself – it must be maintained through the operational life of the building, and the cleaning programme is one of the most active variables in that ongoing equation.
The chemicals going into the mop bucket, the filter class on the vacuum cleaner, the waste segregation discipline at the end of each shift – none of these feel like the headline story of a sustainability achievement. But they are the story, every day the building is in use. The green plaque by the entrance was earned partly on a cleaning specification. Keeping it there requires treating that specification with precisely the same seriousness.