UKAS Accreditation Explained: Why It Matters for Asbestos, Legionella & Geotechnical Testing

What Is UKAS Accreditation?

The Testing Lab holds UKAS accreditation across its asbestos, Legionella, and geotechnical divisions — but what does that actually mean? UKAS, the United Kingdom Accreditation Service, is the sole national body recognised by the UK government to assess and accredit organisations that provide testing, calibration, inspection, and certification services. It operates in accordance with internationally recognised standards, primarily ISO/IEC 17025 for testing and calibration laboratories. Accreditation is not a one-off rubber stamp. It is a rigorous, evidence-based process in which UKAS technical assessors — specialists in their respective fields — evaluate every aspect of a laboratory's operations: its personnel competence, equipment calibration, method validation, quality management systems, data integrity, and reporting accuracy. Laboratories that achieve accreditation are listed on the UKAS public register and are subject to ongoing surveillance visits to verify that standards are continuously maintained.

Why UKAS Accreditation Matters for Asbestos Testing

Asbestos remains the UK's single greatest occupational health killer, responsible for approximately 5,000 deaths every year. The Control of Asbestos Regulations 2012 places a legal duty on employers and building owners to manage asbestos risk, and any bulk sample analysis or airborne fibre counting used to discharge that duty must be carried out by a UKAS-accredited laboratory. Without accreditation, results cannot be considered legally defensible and may not be accepted by the Health and Safety Executive, insurers, or courts. UKAS-accredited asbestos laboratories must demonstrate proficiency in techniques such as phase contrast microscopy (PCM) for airborne fibre counting and polarised light microscopy (PLM) for bulk material identification. They must also participate in external proficiency testing schemes, including those run by the Asbestos Testing and Consultancy Association (ATaC) and RICE (Rapid Interlaboratory Comparison Exercise). Choosing a UKAS-accredited laboratory is not simply best practice — in many circumstances it is a legal requirement.

The Role of Accreditation in Legionella Testing

Legionella bacteria thrive in water systems where temperature, nutrients, and stagnation create favourable conditions. The consequences of a Legionella outbreak — Legionnaires' disease — can be fatal, particularly for vulnerable individuals. HSE's Approved Code of Practice L8 and Technical Guidance HSG274 set out the legal framework for Legionella risk management, and both emphasise that water sampling and microbiological analysis should be carried out by competent, ideally accredited, laboratories. A UKAS-accredited Legionella laboratory must validate its culture methods, maintain the cold chain integrity of samples, and demonstrate that its counting and identification procedures meet the requirements of ISO 11731. This matters profoundly in a practical sense: results from non-accredited laboratories may be challenged by regulators, may not satisfy insurers, and — most critically — could provide false reassurance about a water system that is actually putting people at risk. Accreditation provides an independent, government-backed guarantee that the science behind the result is sound.

Geotechnical Testing: Where Accuracy Has Structural Consequences

Geotechnical testing underpins some of the most consequential decisions in construction and civil engineering. Soil classification, CBR testing, consolidation analysis, compaction trials, and contamination screening all feed directly into foundation design, slope stability assessments, and planning submissions. Errors in geotechnical data are not simply inconvenient — they can result in structural failure, cost overruns running into millions of pounds, or regulatory non-compliance that halts a project entirely. UKAS accreditation to ISO/IEC 17025 for geotechnical testing assures clients, engineers, and regulators that test methods are validated, equipment is calibrated, and results are traceable to national measurement standards. For projects governed by Eurocodes or those requiring data submitted to the Environment Agency, Local Planning Authorities, or Highways England, UKAS-accredited geotechnical data carries authority that non-accredited results simply cannot replicate.

How to Verify Accreditation and What to Look For

Not all laboratories that claim competence hold genuine UKAS accreditation, and even those that do may not hold it for the specific test methods relevant to your project. There are three straightforward steps to verify a laboratory's status. First, search the UKAS public schedule at ukas.com — every accredited organisation has a publicly available schedule of accreditation listing the specific tests and standards covered. Second, check that the specific test method you require appears on that schedule; a laboratory accredited for some asbestos techniques but not others, for example, may not be appropriate for your needs. Third, ask the laboratory to provide its UKAS certificate number and scope of accreditation as part of any quotation or contract. Reputable, genuinely accredited laboratories will make this information readily available. Be cautious of vague references to 'working to ISO 17025' without the corresponding UKAS certificate, as this is not equivalent to formal accreditation.

The Bigger Picture: Accreditation as a Foundation for Trust

In an era of increasing regulatory scrutiny, litigation risk, and public awareness of environmental and occupational health hazards, the decision of which laboratory to use is rarely a trivial procurement choice. UKAS accreditation is the cornerstone of laboratory quality assurance in the UK, providing a transparent, independently verified signal of technical competence and integrity. For organisations managing asbestos risks in buildings, operators responsible for water systems, or engineers and developers relying on ground investigation data, using a UKAS-accredited laboratory is the clearest way to demonstrate due diligence. It means that if a result is ever questioned — by a regulator, a court, a client, or an insurer — the methodology, the equipment, and the personnel behind it can withstand the highest levels of scrutiny. That is what accreditation ultimately provides: confidence you can stand behind.

Frequently Asked Questions

Is it a legal requirement to use a UKAS-accredited laboratory for asbestos testing?

For many asbestos-related activities it is effectively a legal requirement. The Control of Asbestos Regulations 2012 requires that air monitoring and analysis be carried out by an accredited laboratory. Bulk sample analysis used to inform a duty-to-manage assessment should also be conducted by a UKAS-accredited body to ensure results are legally defensible and accepted by the HSE, insurers, and courts.

How do I check whether a laboratory is genuinely UKAS accredited?

Visit the UKAS website at ukas.com and use the online directory to search for the laboratory by name or UKAS number. Crucially, review the laboratory's schedule of accreditation to confirm that the specific test methods relevant to your project — for example, airborne fibre counting by PCM, Legionella culture to ISO 11731, or a particular geotechnical soil test — are explicitly listed within their accredited scope.

Does UKAS accreditation cover all tests a laboratory offers?

Not necessarily. A laboratory may hold UKAS accreditation for some test methods but not others, and may offer non-accredited services alongside its accredited scope. Always request the full schedule of accreditation and confirm that your required tests are included. Reputable laboratories will clearly differentiate between accredited and non-accredited work on their reports and documentation.

How often does a UKAS-accredited laboratory have its accreditation reviewed?

UKAS conducts surveillance assessments of accredited laboratories on an ongoing basis, typically at least annually, and carries out full reassessments every four years. Laboratories must demonstrate continuous compliance with ISO/IEC 17025 and relevant UKAS technical requirements between assessments. Failure to meet standards can result in suspension or withdrawal of accreditation, which is publicly recorded on the UKAS register.