Top 10 ISO 9001 Certification Bodies in the UK
Ratings checked on 1 November 2026. Next review: 1 May 2027.
Choosing a certification body for ISO 9001 is one of the most important decisions in your certification journey. This list ranks UKAS-accredited certification bodies that offer ISO 9001 certification in the UK, based on what their customers say on Google.
Every organisation listed holds UKAS accreditation and has at least 10 Google reviews. Use the list as a starting point, then compare profiles and request quotes from the certification bodies that best suit your organisation.
- 2
Auva Certification Limited
4.9 from 52 Google reviews
Accreditation: UKAS
Auva Certification Limited provides accredited ISO 9001 and ISO 14001 certification. This UK registrar delivers professional audits for businesses of all sizes.
- 4
Simply Certification Limited
4.8 from 19 Google reviews
Accreditation: UKAS
Simply Certification Limited offers UKAS accredited ISO 9001, 14001, and 45001 audits alongside PAS 2030 and MCS schemes for the UK built environment sector.
- 5
Centre for Assessment Limited
4.6 from 115 Google reviews
Accreditation: UKAS
UKAS-accredited Centre for Assessment provides ISO 9001, 14001, and 45001 certification. A global leader serving the law, wind energy, and government sectors.
- 6
Lloyd's Register Marine Limited
4.6 from 40 Google reviews
Accreditation: UKAS
- 8
CIBSE Certification Limited
4.6 from 12 Google reviews
Accreditation: UKAS
- 9
NQA Certification Ltd
4.5 from 22 Google reviews
Accreditation: UKAS
Founded in the UK in 1988 as National Quality Assurance, NQA is now part of Kiwa, a global leader in assurance, testing, inspection, and certification services. With over 30 years of experience supporting clients with ISO certification, NQA holds more than 53,000 active certificates across organizations of varying sizes in over 90 countries. NQA is accredited by both the United Kingdom Accreditation Service (UKAS) and the ANSI National Accreditation Board (ANAB), making its certificates recognized in the UK, US, and internationally. The body emphasizes practical, supportive auditing and transparent, all-inclusive pricing with no hidden certification or admin fees.
- 10
LRQA
4.4 from 28 Google reviews
Accreditation: UKAS
LRQA provides global ISO certification, inspection, and assurance services. Expert auditors deliver UKAS-accredited risk management for complex supply chains.
How We Ranked These Certification Bodies
- Only UKAS-accredited certification bodies listed on ISOCentral that offer ISO 9001 certification in the UK are included.
- Each must have at least 10 Google reviews.
- They are ordered by Google star rating. Where ratings are equal, the organisation with more Google reviews ranks higher.
- We use Google reviews because they are not a paid-for review service. Paid platforms can let providers choose which customers they invite to leave a review, which makes scores easier to influence.
- The list is reviewed every six months. Ratings are taken from Google on the date shown above and may have changed since.
Ratings and review counts are sourced from Google.
Frequently Asked Questions
- Why are the rankings based on Google reviews?
- Google reviews are not a paid-for service. Paid review platforms can allow providers to choose which customers are invited to leave a review, for example only those who have successfully achieved certification, which makes scores easier to influence.
- Why must certification bodies be UKAS-accredited?
- UKAS is the UK's national accreditation body. UKAS-accredited certificates are widely recognised by customers, regulators and tender panels, so only accredited certification bodies are included.
- How often is this list updated?
- The list is reviewed every six months. The date the ratings were checked is shown at the top of the page.
- Is a higher-ranked certification body always the right choice?
- Not necessarily. Ratings reflect customer experience, but you should also consider sector experience, auditor availability, location and cost. Request quotes from several certification bodies before deciding.
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Browse all certification bodies in our directory, or estimate your certification costs before you request quotes.