For businesses based in London seeking ISO certification, choosing the right certification body can make a big difference to credibility, compliance and commercial opportunities. Most buyers and public sector frameworks prefer certificates issued by UKAS-accredited certification bodies, as accreditation by the United Kingdom Accreditation Service (UKAS) shows the provider has been independently assessed for competence and impartiality.
Below is our local-focused overview of London certification agencies, support services and tips for London organisations working towards ISO certification.
Local ISO certification agencies in London
Here are some certification agencies and bodies operating in London that can help your organisation achieve ISO certification. While not all may have UKAS accreditation listed on CertCheck, they serve businesses in London and can either issue certificates or support your certification journey.
Certification bodies and agencies
- ISOCA – Certification agency based in London offering management system certification services.
- UKACB – London-based certification body specialising in quality and management system certification.
- Bureau of Quality Certification UK Ltd – Certification agency in central London focusing on compliance and ISO certification.
- QAS International Ltd – ISO certification agency serving London businesses with a range of standards.
Tip: Always check whether the certification body is UKAS-accredited for the specific ISO standard you need (e.g. ISO 9001 or ISO 27001) via the UKAS directory or CertCheck before entering an agreement.
Nationally recognised certification bodies that serve London
Many well-established, UKAS-accredited certification bodies operate across the UK, including London clients. These may not have offices in the city but regularly work with London businesses:
- British Assessment Bureau – UKAS-accredited for ISO 9001, ISO 14001, ISO 27001, and more.
- Approachable Certification – UKAS-accredited provider known for practical certification audits.
- ISOQAR – UKAS-accredited registrar with broad ISO coverage.
- 3core² Certification Ltd – UKAS-accredited certification body for management systems.
- CQS Ltd – Certification body with experience across multiple ISO standards.
- NQA Global Certification Body – Global provider with UKAS-accredited services and presence in London engagements.
These bodies provide third-party audits and certificates that are widely accepted across industries and by tendering authorities throughout the UK.
London ISO consultants and audit preparation support
Certification bodies issue the audit and certificate, but many London businesses benefit from support in preparing their management systems:
- twoSB – ISO consultants in London – Specialist consultancy helping with ISO 9001, ISO 14001, ISO 27001 and more.
- Assent Risk Management – ISO 9001 consultants – Supporting implementation and readiness for accredited certification.
- RKMS Group – ISO 27001 consultants – Offers implementation support ahead of certification.
These consultants can help you document processes, conduct internal audits and prepare for the final assessment by a certification body.
Popular ISO standards pursued by London businesses
London companies commonly seek certification in these internationally recognised standards:
- ISO 9001 – Quality management system
- ISO 14001 – Environmental management
- ISO 27001 – Information security management
- ISO 45001 – Occupational health and safety
Achieving certification typically involves internal preparation, a formal audit by a certification body and regular surveillance visits during the certification cycle.
How UKAS accreditation matters
Choosing a UKAS-accredited certification body is key for most London organisations. Accreditation by UKAS indicates the provider has been independently assessed for competence and impartiality, which makes your certificate more credible and widely accepted — essential for public sector tenders and many private sector contracts.
To verify accreditation and see exactly what standards a body is accredited for, use the UKAS CertCheck directory.
Tips for London organisations seeking ISO certification
- Verify accreditation first: Ensure your chosen body is accredited for the specific ISO standard you want.
- Plan your timeline: Certification typically takes several months from preparation to final audit.
- Consider consultancy support: Consultants can reduce delays and make your audit smoother, especially if you lack internal ISO experience.