NABL Four-Year Accreditation Cycle 2026: What Labs Should Know Before a Premises Change
Updated: 13 September 2026
A longer accreditation cycle can reduce the temptation to think only in terms of a renewal date.
It also creates a more important management question:
Can the laboratory demonstrate continued competence throughout the whole cycle?
That question becomes even more important when the laboratory changes premises, adds equipment, expands scope or changes key resources.
A laboratory may move only a few kilometres and still change the conditions that support valid calibration or testing.
Temperature control may be different. Equipment may be dismantled and reinstalled. Reference standards may be transported. Power quality may change. Vibration, dust, humidity or electromagnetic conditions may differ.
From a metrology perspective, relocation is therefore a technical change, not only an administrative change.
What changed in the NABL accreditation cycle?
NABL's official News & Announcements page records that on 16 October 2024, accreditation validity was increased from two years to four years.
NABL then published an Assessment Programme for Accredited CABs under the Four-Year Accreditation Cycle on 25 June 2026.
Other relevant 2026 updates include:
- 31 August 2026: release of NABL 100A, General Information Brochure, Amendment 07;
- 31 August 2026: update in procedure regarding change in CAB premises;
- 4 September 2026: publication of a list of accredited laboratories whose accreditation cycle had been extended.
NABL's current document register shows NABL 100A as Issue 01, Amendment 07, with amendment date 31 August 2026.
Does a four-year accreditation cycle mean fewer controls?
No.
A longer certificate-validity period does not remove the laboratory's responsibility to maintain competence and conformity between major assessments.
NABL has a dedicated annual-surveillance checklist, NABL 218A, and in June 2026 published a specific assessment programme for the four-year cycle.
The useful way to interpret the four-year model is:
- accreditation has a longer overall cycle;
- continued conformity still has to be demonstrated;
- NABL retains assessment and surveillance mechanisms during the cycle;
- significant changes still need to be communicated and controlled.
What is a CAB?
CAB means Conformity Assessment Body.
NABL accredits several types of CABs, including testing laboratories, calibration laboratories, medical laboratories, proficiency testing providers, reference material producers and biobanks under the applicable accreditation standards.
For Multitek readers, the most relevant category is usually a testing or calibration laboratory accredited against ISO/IEC 17025.
Why the four-year cycle changes laboratory planning
Under a longer accreditation cycle, laboratories need stronger internal visibility of changes that occur between major accreditation milestones.
Four years is enough time for a laboratory to experience:
- staff turnover;
- replacement of major standards;
- software changes;
- new measurement methods;
- scope extension;
- equipment repair or relocation;
- changes in environmental-control systems;
- movement to new premises.
Any of these can affect the evidence that supported the original accreditation decision.
Why premises change is a high-risk accreditation event
The laboratory address appears on an accreditation certificate, but the importance of premises goes far beyond the address.
Laboratory premises can affect:
- environmental control;
- equipment installation;
- reference-standard stability;
- sample or instrument handling;
- segregation of incompatible activities;
- power supply;
- cleanliness;
- vibration;
- security and access;
- data and record protection.
A relocation can therefore change the technical conditions under which the laboratory previously demonstrated competence.
What does NABL say about significant changes?
NABL's current online accreditation terms state that the CAB shall inform NABL within 15 days of significant changes affecting its activities and operations relevant to accreditation.
The examples listed by NABL include changes involving:
- legal, commercial, ownership or organizational status;
- top management and key personnel;
- main policies;
- resources and premises;
- other matters that may affect the CAB's ability to fulfil the applicable accreditation standard.
NABL separately posted an update to its procedure for change in CAB premises on 31 August 2026.
Should a lab move first and tell NABL later?
Laboratories should use the current NABL premises-change procedure and portal instructions to determine the correct sequence.
Older procedures and current NABL terms show that premises changes require formal interaction with NABL and can involve assessment of the new location.
Because NABL posted a specific procedure update on 31 August 2026, a laboratory should not rely on an old downloaded procedure when planning a 2026 move.
Before finalizing relocation dates, confirm:
- the current NABL notification requirement;
- the current portal application or change process;
- what documents are required;
- whether on-site assessment is required;
- how accreditation claims are handled during the transition;
- how the current scope and certificate are affected.
What should be technically revalidated after relocation?
A laboratory should perform a risk-based review of every measurement capability that could have been affected by the move.
The review may include:
| Area | Questions after relocation |
|---|---|
| Environmental conditions | Can the new laboratory maintain the required temperature, humidity, cleanliness or other conditions? |
| Reference standards | Could transport or reinstallation have affected the standard? |
| Major equipment | Was the equipment dismantled, moved, levelled or reconfigured? |
| Utilities | Are electrical supply, grounding, compressed air or other utilities suitable? |
| Software and networks | Were interfaces, databases, servers or instrument connections changed? |
| Workflow | Does the new layout introduce contamination, handling or mix-up risk? |
| Measurement uncertainty | Has any significant influence quantity changed enough to affect the uncertainty evaluation? |
Calibration laboratories need an equipment-specific relocation plan
Not every item needs the same response after a move.
A hand tool stored and transported safely may require a different review from a high-accuracy comparator, CMM, balance, pressure standard or temperature system.
Equipment that can be affected by installation should receive particular attention.
Examples include:
- coordinate measuring machines;
- mass comparators and high-resolution balances;
- dimensional comparators;
- surface plates;
- deadweight testers;
- temperature baths and furnaces;
- electrical reference systems;
- high-accuracy force and torque systems.
The laboratory should determine whether recalibration, verification, intermediate checks or performance tests are needed before accredited work resumes.
Why environmental mapping matters after a move
A new room may reach the same average temperature as the old room while having a different temperature gradient or stability.
For dimensional metrology, thermal gradients can affect both the instrument and the item under calibration.
For mass calibration, air movement and vibration can influence high-resolution weighing.
For electrical calibration, grounding, electromagnetic interference and power quality may matter.
The correct environmental review therefore depends on the measurement discipline.
Does the measurement uncertainty budget need revision?
Possibly.
If relocation changes an influence quantity that contributes materially to measurement uncertainty, the laboratory should review the uncertainty budget.
Examples could include:
- temperature stability;
- temperature gradients;
- humidity where relevant;
- vibration;
- electrical noise;
- reinstallation repeatability;
- reference-system performance.
The laboratory should not copy the old uncertainty budget into the new location without asking whether its assumptions are still true.
What happens to scope after a premises change?
Scope is one of the most important items to verify during relocation.
A laboratory may have the same personnel and equipment but still need to demonstrate that the new premises support the accredited capability.
The laboratory should compare every requested or existing accredited parameter against:
- new environmental capability;
- installed equipment;
- reference standards;
- personnel availability;
- measurement method;
- uncertainty capability.
If a capability cannot be demonstrated at the new site, it should not be assumed to remain valid merely because it existed at the previous address.
Four-year cycle and annual surveillance
NABL's official document register lists NABL 218A, Checklist for Annual Surveillance, Issue 01 dated 6 August 2025.
NABL also published a specific assessment programme for accredited CABs under the four-year cycle in June 2026.
This means laboratories should maintain assessment readiness throughout the cycle.
Useful evidence includes:
- internal audit results;
- management review;
- proficiency testing or other quality-control evidence where applicable;
- equipment calibration status;
- personnel competence records;
- complaint and nonconformity records;
- corrective actions;
- changes in scope, equipment, personnel or premises.
A longer cycle makes change control more important
A four-year accreditation cycle increases the amount of operational history that can accumulate between accreditation milestones.
A laboratory should therefore maintain a change register rather than relying on memory.
The register can include:
| Change | Potential accreditation impact |
|---|---|
| Premises move | Infrastructure, environment, location, certificate and scope |
| Key personnel change | Competence, authorization and technical management |
| Major equipment replacement | Method validation, traceability and uncertainty |
| Software change | Calculations, data integrity and reporting |
| Scope extension | New competence, equipment, methods and assessment evidence |
What should a laboratory do before signing a new lease?
Accreditation planning should begin before the final move date.
A technical pre-relocation review can check:
- space required for each accredited activity;
- temperature and humidity capability;
- power and grounding requirements;
- vibration sources;
- cleanliness and contamination risks;
- reference-standard storage;
- instrument flow and segregation;
- security and access;
- network and data infrastructure;
- safe equipment relocation requirements;
- NABL premises-change requirements.
Finding a technical problem before committing to the premises is far cheaper than discovering it after expensive laboratory equipment has been installed.
A practical relocation sequence
- Review the current NABL procedure. Use the latest NABL announcement, NABL 100A and portal requirements.
- Define affected scope. Identify every accredited activity performed at the premises.
- Perform technical site review. Check environment, utilities, layout and risk.
- Plan equipment relocation. Identify equipment needing specialist movement or post-move verification.
- Control the move. Protect reference standards, records and samples.
- Re-establish environmental control. Collect evidence before accredited work resumes.
- Verify equipment. Perform calibration, intermediate checks or performance verification as technically justified.
- Review uncertainty. Confirm that old assumptions remain valid.
- Complete NABL actions. Follow current assessment and approval requirements.
- Update customer-facing information. Use the approved current accreditation details and scope.
What should laboratories avoid during relocation?
- Assuming the same equipment automatically has the same capability after reinstalling it.
- Using the old accredited address after operations have moved without following the current NABL process.
- Restarting accredited work before required verification is complete.
- Copying the previous environmental limits without confirming the new room can maintain them.
- Ignoring the effect of transport on reference standards.
- Updating the website before the accreditation status for the new premises is clear.
- Relying on an old NABL premises-change procedure despite the August 2026 update.
What should customers check when a laboratory relocates?
Customers should verify the laboratory's current accreditation rather than relying on an old certificate saved in supplier records.
Check:
- current laboratory name;
- current accredited location;
- current accreditation certificate information;
- current scope of accreditation;
- the required parameter and range;
- the location at which the calibration or test is being performed.
This is particularly important during a transition period when old and new addresses may both appear in business systems.
Does the four-year cycle change ISO/IEC 17025?
No.
The four-year cycle is part of NABL's accreditation administration and assessment framework.
ISO/IEC 17025 continues to define competence, impartiality and consistent operation requirements for testing and calibration laboratories.
A longer accreditation cycle does not reduce requirements related to:
- personnel competence;
- equipment;
- metrological traceability;
- measurement uncertainty;
- environmental conditions;
- validity of results;
- data and information management;
- internal audit and management review.
Why this 2026 change matters to calibration managers
The four-year cycle shifts attention from "renewal preparation" toward continuous accreditation control.
The premises update reinforces the same lesson.
Accreditation should reflect the laboratory that actually exists today, including its people, equipment, environment, systems and location.
A certificate with a long validity period is not a substitute for managing change.
The laboratories most likely to handle the four-year cycle well are those that can show, at any point, what changed, why it changed, how the risk was evaluated and what evidence confirms continued technical capability.
Frequently asked questions
How long is the NABL accreditation cycle?
NABL announced in October 2024 that accreditation validity was increased from two years to four years. Laboratories should use the current NABL assessment programme for the surveillance and assessment requirements that apply during that cycle.
Did NABL update the four-year-cycle assessment programme in 2026?
NABL posted an "Assessment Programme for Accredited CABs under the Four-Year Accreditation Cycle" on 25 June 2026.
Did NABL change its procedure for laboratory premises in 2026?
Yes. NABL posted an update regarding its procedure for dealing with changes in CAB premises on 31 August 2026. Laboratories should use the current procedure when planning or implementing a relocation.
Does moving a NABL laboratory only require changing the address?
No. A premises change can affect infrastructure, environmental control, equipment installation, scope, traceability and measurement uncertainty. It also requires compliance with the current NABL change procedure.
Should equipment be recalibrated after a laboratory move?
The answer depends on the equipment, how it was moved, installation sensitivity and the risk to measurement validity. The laboratory should define and document appropriate calibration, verification or intermediate checks before resuming affected accredited work.
Does a four-year accreditation certificate mean NABL does not assess the laboratory during those four years?
No. NABL maintains surveillance and assessment mechanisms during the accreditation cycle and has published a specific assessment programme for accredited CABs under the four-year cycle.
Sources checked
- NABL: News & Announcements . Relevant announcements include the four-year accreditation validity update, the 25 June 2026 assessment programme, the 31 August 2026 premises-change update and the 4 September 2026 cycle-extension list.
- NABL: Accreditation Documents . The current register lists NABL 100A Amendment 07 dated 31 August 2026 and NABL 218A, Checklist for Annual Surveillance.
- NABL online accreditation portal: Calibration accreditation terms . NABL states that CABs must inform it of significant changes affecting accreditation-related activities and operations, including resources and premises.
- NABL: Accreditation overview . Testing and calibration laboratory accreditation is based on ISO/IEC 17025.
Editorial note: NABL accreditation procedures can be amended. This article explains official public information available as of 13 September 2026. Laboratories should use the current NABL assessment programme, current NABL 100A, current portal instructions and current premises-change procedure before taking accreditation-related action.
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