When hiring a commercial window cleaning company, accreditations tell you whether a contractor meets the health, safety, and compliance standards required to work on your building, and whether they’ll hold up to scrutiny if something goes wrong.
For property managers, facilities managers, and building owners, appointing an unaccredited contractor can create genuine liability. If an operative is injured on site, or if your building’s insurance or compliance audit requires proof of contractor vetting, accreditations are the evidence you need.
This guide explains the key accreditations to look for, what each one means for you as a client.
Why Accreditations Matter for Commercial Window Cleaning
Commercial window cleaning, particularly at height, carries real risk. According to the Health and Safety Executive (HSE), falls from height are the leading cause of fatal workplace injuries in Great Britain, consistently accounting for around 28% of all worker deaths every year since 2001. The Health and Safety at Work Act 1974 places a duty of care on both the contractor and the person managing the premises.
Accreditations demonstrate that a contractor has been independently assessed against recognised standards. They are not self-declared, they require audits, documentation, and ongoing compliance.
For large commercial buildings, public sector properties, and corporate clients, they are typically a contractual requirement before any work can begin.
Choosing an accredited contractor also protects you. If an incident occurs on your site, having appointed a contractor with verified health and safety credentials significantly reduces your exposure.
Health and Safety Accreditations
CHAS (Contractors Health and Safety Assessment Scheme)
CHAS is one of the most widely recognised health and safety accreditation schemes in the UK. It assesses contractors against a rigorous set of health and safety standards, covering everything from risk assessments and method statements to insurance and legal compliance.
For clients, CHAS accreditation means the contractor has been independently verified as compliant, reducing the burden of pre-qualification checks on your end.
Many large property management companies and public sector bodies require CHAS as a minimum before awarding contracts.
Safe Contractor Approved
Safe Contractor is a leading third-party health and safety assessment scheme used widely across the UK facilities management and construction sectors. Like CHAS, it independently verifies that a contractor meets the health, safety, and legal standards required to work on commercial premises.
Many corporate clients and property managers use Safe Contractor approval as part of their supplier vetting process. It provides documented assurance that the contractor has been assessed and approved, not just that they claim to be compliant.
Working at Height Accreditations
IRATA (Industrial Rope Access Trade Association)
For high-rise buildings where water-fed poles or access platforms cannot reach, abseiling is the required method and IRATA certification is the internationally recognised standard for rope access work.
IRATA certification operates across three levels. Level One operatives work under direct supervision of a Level Three. Level Two operatives have demonstrated greater skill but still work under Level Three guidance. Level Three operatives are qualified to work independently and must be present on every rope access job.
For clients, IRATA certification means the operatives working on your building have been trained and assessed to an internationally recognised standard, not just put on a rope. It is the benchmark accreditation for abseiling window cleaning and is a requirement for most high-rise commercial contracts.
All Clean London’s abseiling operatives hold IRATA certification. Find out more about our abseiling window cleaning service.
RoSPA (Royal Society for the Prevention of Accidents)
RoSPA membership signals a company’s ongoing commitment to accident prevention and health and safety best practice. RoSPA-affiliated businesses are expected to maintain high standards of risk management and safety culture across all operations.
For clients managing buildings where window cleaning involves work at height, RoSPA membership provides additional reassurance that safety is embedded into the contractor’s day-to-day operations, not just their paperwork.
Quality and Environmental Standards
ISO 9001 (Quality Management)
ISO 9001 is the internationally recognised standard for quality management systems. It assesses whether a company has the processes in place to consistently deliver services that meet client and regulatory requirements, and whether it actively works to improve those processes over time.
For clients, ISO 9001 certification means the contractor operates to a documented and audited quality standard, reducing the risk of inconsistent service delivery across your building or portfolio.
ISO 14001 (Environmental Management)
ISO 14001 certification demonstrates that a company has identified and is actively managing its environmental impact. For commercial window cleaning, this covers areas such as water usage, chemical handling, and waste disposal.
For clients with sustainability commitments or ESG reporting requirements, appointing an ISO 14001 certified contractor provides documented evidence that your supply chain meets environmental management standards.
ISO 45001 (Occupational Health and Safety Management)
ISO 45001 is the international standard for occupational health and safety management systems. It goes beyond basic compliance, requiring organisations to proactively identify and reduce workplace health and safety risks across all operations.
For clients, ISO 45001 certification is one of the strongest indicators that a contractor takes health and safety seriously at an organisational level, not just on individual jobs. It is increasingly required by large corporate clients and public sector bodies as part of contractor approval processes.
Industry Body Membership
BICSc (British Institute of Cleaning Science)
BICSc is the largest independent, professional and educational body in the cleaning industry. BICSc membership and qualifications demonstrate that operatives have been trained and assessed to a recognised industry standard, covering cleaning techniques, equipment, and safety.
For clients, BICSc accreditation signals that the company invests in the professional development of its operatives, not just their compliance paperwork.
Federation of Window Cleaners (FWC)
The FWC is the primary UK trade body for the window cleaning industry. Membership provides access to industry-specific training, guidance, and representation, and signals that a company is operating within a recognised professional framework.
For clients vetting contractors, FWC membership is a straightforward indicator that the company is engaged with industry standards and best practice, rather than operating outside any professional oversight.
Employer Standards
Living Wage Employer
Being a recognised Living Wage Employer, meaning all operatives are paid at or above the real Living Wage, an independently calculated rate based on the actual cost of living, set above the government’s minimum wage.
For clients with ethical procurement policies or supply chain standards, appointing a Living Wage Employer provides documented evidence that your contractor treats its workforce fairly. It is increasingly a requirement for public sector contracts and large corporate clients with ESG commitments.
All Clean London's Full Accreditation Profile
All Clean London holds the following accreditations, making us one of the most comprehensively certified commercial window cleaning companies in London:
CHAS · Safe Contractor · IRATA · RoSPA · ISO 9001 · ISO 14001 · ISO 45001 · BICSc · Federation of Window Cleaners · Living Wage Employer
Established in 1979, we have over 45 years of experience delivering commercial window cleaning across London, with accreditations independently verified and kept current across all operations.
For full details of our health and safety standards and compliance documentation, visit our health and safety page.
Questions to Ask Before Hiring a Commercial Window Cleaner
Before appointing any commercial window cleaning contractor, consider asking the following, or see our full guide on hiring a window cleaning service for a more detailed breakdown.
Are you CHAS or Safe Contractor approved? These are the two most recognised health and safety pre-qualification schemes in the UK. A reputable contractor should be able to provide documentation immediately.
Do your operatives hold IRATA certification for abseiling work? For any high-rise or rope access cleaning, IRATA certification is the industry benchmark. Always ask for evidence rather than a verbal confirmation.
What ISO certifications do you hold? ISO 9001, 14001, and 45001 together cover quality, environmental, and health and safety management. All three together indicate a well-run, compliant operation.
Can you provide proof of public liability insurance? Any reputable commercial contractor should carry adequate public liability cover and be able to provide certificates on request.
Are you a member of any industry trade bodies? FWC membership or BICSc accreditation indicates professional engagement beyond minimum legal compliance.
Do commercial window cleaners need a licence? In most of England and Wales, window cleaners do not legally require a licence to operate, though Scotland is an exception. That said, accreditations like CHAS, Safe Contractor, and IRATA serve as the industry’s practical equivalent, demonstrating verified compliance where no formal licence exists. For a full breakdown, see our guide on whether commercial window cleaners need a licence in London.
Frequently Asked Questions
At a minimum, look for CHAS or Safe Contractor approval, public liability insurance, and relevant working at height training. For high-rise buildings requiring rope access, IRATA certification is essential.
ISO 9001, ISO 14001, and ISO 45001 certifications indicate a higher level of organisational compliance across quality, environmental, and health and safety management.
It is not a legal requirement, but it is a practical requirement for many commercial contracts. Large property management companies, public sector bodies, and corporate clients routinely require CHAS or equivalent accreditation as part of their contractor approval process. Without it, a contractor may be unable to tender for significant commercial work.
Both are independently run health and safety pre-qualification schemes that assess contractors against similar standards. Many clients accept either, but some larger organisations require both.
The assessment processes differ slightly, but the underlying purpose is the same, to independently verify a contractor’s health and safety compliance before they are appointed.
IRATA is the internationally recognised standard for industrial rope access. It operates across three levels, with Level Three required to be present on every rope access job.
For clients, it means the operatives working on your building have been trained and assessed to a verified international standard, not just briefed internally.
ISO 45001 is the international standard for occupational health and safety management systems. It requires organisations to proactively identify and manage workplace health and safety risks, going beyond basic legal compliance.
For clients, it is one of the strongest indicators that a contractor operates a genuine safety culture across all operations.
Get a Quote from an Accredited Commercial Window Cleaner in London
All Clean London has been delivering accredited commercial window cleaning across London since 1979. With over 1,200 clients and a full suite of independently verified accreditations, we provide the compliance documentation, safety standards, and professional service that property managers and facilities teams require. Request a free quote today.
