PAT Testing Frequency Guide for UK Businesses: How Often Should You Test?
How often you should do PAT testing depends entirely on risk: the type of electrical equipment you have, how it’s used, and the environment it’s in. Low-risk office IT might only need a formal test every 1–2 years, while high-wear power tools on a construction site must be checked far more frequently. The goal is to maintain a safe workplace and provide the clear evidence that HSE inspectors and insurers demand.
Key Takeaways (TL;DR)
No Single “PAT Law”: UK law requires employers to keep electrical equipment safe, and PAT testing is the industry-standard way to prove you are doing so.
Base Intervals on Risk: Your testing schedule should be based on the environment (office vs. workshop), equipment class, and how often it’s used.
Typical Frequencies:
Offices: 12–24 months for IT equipment.
Hospitality/Kitchens: 6–12 months for portable appliances.
Construction Sites: As frequently as site policy requires (often 3 months or less) due to high wear and tear.
Keep Detailed Records: Always maintain a PAT certificate, an asset register, and a log of any repairs or actions taken.
Review Your Schedule: Re-evaluate your testing frequency annually or after any workplace incidents or changes.
Why Is PAT Testing Frequency Risk-Based?
A one-size-fits-all approach to PAT testing is inefficient and can leave you exposed. Instead, UK guidance from the Health and Safety Executive (HSE) and the IET Code of Practice recommends a risk-based approach.
This means you must assess the factors that increase the likelihood of damage or electrical faults. Key risk factors include:
The Environment: A calm, dry office poses a much lower risk than a dusty workshop, a damp commercial kitchen, or a harsh construction site.
Equipment Type: A Class I (earthed) metal appliance has different risks than a Class II (double-insulated) one. 110V construction equipment has its own specific requirements.
Usage and Portability: A stationary PC is unlikely to get damaged. A handheld vacuum cleaner, a power tool, or a portable extension lead that is moved daily will wear out much faster.
User Checks: A workplace where staff are trained to perform and log regular user checks can safely justify longer intervals between formal tests.
Recommended PAT Testing Frequencies by Environment
Use this table as a starting point for your risk assessment. You can then adjust the intervals based on the specific conditions and equipment history at your business.
How to Create Your Own PAT Testing Schedule: A 5-Step Process
Follow this simple workflow to build and justify a testing schedule tailored to your business.
Create an Asset List: Build a simple inventory of all your portable electrical equipment. Note its location, type (e.g., Class I, Class II), and how it’s used.
Assess the Risk: For each item or group of items, consider the risk drivers: heat, moisture, dust, frequent movement, and history of damage.
Set Provisional Intervals: Use our table above as your starting point. Shorten the interval for high-risk items and consider extending it slightly for very low-risk, static equipment.
Implement Checks Between Tests: Empower your team to conduct informal user checks (looking for obvious damage before use) and schedule formal visual inspections for higher-risk equipment.
Review and Adjust: After your first testing cycle, review the results. If you have a high failure rate, shorten the intervals. If failures are consistently very low and your checks are robust, you may be able to justify the current schedule. Always document your reasoning.
What PAT Testing Records Should You Keep?
An HSE inspector or insurance assessor will expect to see clear, organised documentation. Be prepared to provide:
A full PAT certificate and detailed asset register with pass/fail results for each item.
A log of all failed items and the remedial action taken (e.g., repaired, replaced, removed from service).
The calibration certificate for the test instrument used.
Your company’s electrical safety policy, including your rationale for the chosen test intervals.
Frequently Asked Questions (FAQs)
Is PAT testing a legal requirement for businesses?
No, there is no single law called the “PAT Testing Law.” However, UK legislation like the Electricity at Work Regulations 1989 requires that all electrical equipment is maintained in a safe condition. PAT testing is the universally recognised best practice for proving compliance and meeting your duty of care.
How often should office equipment be PAT tested?
For most low-risk office IT like PCs and monitors, a frequency of 12 to 24 months is common, supported by regular user checks. However, more heavily used items like extension leads and kitchen appliances should be tested more often, typically every 6 to 12 months.
Do 110V construction tools need more frequent testing?
Yes, absolutely. Construction sites are harsh environments, and 110V equipment is subjected to heavy use, dust, and moisture. Many sites mandate testing every 3 months, alongside daily user checks and formal visual inspections.
Can we extend test intervals if we have very few failures?
Potentially. If your equipment is in a low-risk environment, you have strong internal checks, and your failure rate is consistently near zero, you may be able to justify a longer interval. You must document your reasoning and review it regularly.
Who can carry out PAT testing?
PAT testing must be carried out by a competent person who has the right training, knowledge, and equipment to do the job safely and interpret the results correctly. For business assurance, most companies use certified engineers with calibrated test instruments.
Get Your PAT Testing Sorted
Ready to implement a risk-based PAT schedule for your business? At All In One Pro PAT, we provide fixed-price quotes and a tailored testing plan that works for you. We offer out-of-hours visits to minimise disruption, include minor repairs, and deliver your certificates the same day.
