PAT Testing Requirements UK — What Tradespeople Need to Know (2026)

Portable Appliance Testing — universally known as PAT testing — is one of those topics every UK tradesperson encounters but few fully understand. Is it a legal requirement? Who has to do it? How often? What does it actually check? And what does it cost? This guide answers all of those questions clearly, without padding.

Whether you run a one-van electrical business, manage a team of gas engineers, or you're a landlord with power tools on your properties, you need to know where you stand.

What Is PAT Testing?

PAT testing is a structured inspection and electrical testing process applied to portable electrical appliances — anything that is powered by electricity and can be moved or connected via a plug. The “portable” in the name covers a wide range: a cordless drill, a kettle in a site cabin, an extension lead on a construction site, a laptop charger in an office, or a floor polisher in a commercial kitchen.

The process has two stages. The first is a visual inspection: checking the plug, the cable, the body of the appliance and any connections for obvious damage, incorrect fusing, burns, cuts or signs of misuse. The second stage involves electrical tests carried out with a dedicated PAT testing instrument, covering earth continuity (for Class I equipment), insulation resistance, and in some cases protective conductor current and touch current.

Once tested, a pass or fail label is applied to the appliance and a record is made. The label shows the date tested, the retest date, and the identity of the tester.

Is PAT Testing a Legal Requirement in the UK?

This is the question most people get wrong. There is no specific law in the UK that requires PAT testing by name. No single piece of legislation says “you must PAT test your appliances every 12 months.”

What the law does require — firmly and without exception — is that electrical equipment used at work is maintained in a safe condition. The key pieces of legislation are:

• The Electricity at Work Regulations 1989 — Regulation 4(2) requires that electrical systems (including portable appliances) be maintained so far as is reasonably practicable to prevent danger.
• The Health and Safety at Work etc. Act 1974 — imposes a general duty on employers to ensure the health, safety and welfare of employees, including providing safe equipment.
• The Provision and Use of Work Equipment Regulations 1998 (PUWER) — requires work equipment to be maintained in an efficient state, in efficient working order, and in good repair.
• The Management of Health and Safety at Work Regulations 1999 — requires employers to assess risks and implement control measures.

PAT testing is simply the most widely accepted and defensible method of demonstrating that you are complying with those obligations. If a piece of electrical equipment causes injury or fire, and you cannot demonstrate that you had a systematic maintenance regime in place, you are exposed to prosecution, civil liability, and insurance problems. PAT testing is how you build and evidence that regime.

Who Needs PAT Testing?

The duty falls on anyone who provides electrical equipment for use at work or in a rental context. In practice, that means:

• Employers of any size — if you have employees, the equipment they use at work must be maintained safely. That includes power tools, site equipment, kettles in the office, and anything else powered by electricity.
• Self-employed tradespeople with employees — a sole trader who takes on one employee immediately becomes an employer for health and safety purposes.
• Self-employed tradespeople working alone — you are not legally required to PAT test equipment used solely by yourself, but the HSE recommends it, many principal contractors insist on it, and your insurance policy may require evidence of it.
• Landlords (commercial) — commercial landlords must ensure electrical appliances provided with the premises are safe. PAT testing is standard practice.
• Landlords (residential) — the rules are less clear-cut for residential landlords, but where appliances are provided with the property, the Landlord and Tenant Act 1985 and the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020 create duties to ensure electrical safety. PAT testing appliances you supply is the sensible approach.
• Businesses that hire or lend equipment — hire companies and tool rental businesses must ensure all equipment is safe before it goes to a customer. PAT testing is a standard part of pre-hire checks.
• Organisers of events — anyone supplying electrical equipment for markets, festivals, or exhibitions must ensure it is safe to use.

What Equipment Needs PAT Testing?

Not all electrical equipment carries the same risk, and the testing approach reflects that. Equipment is classified into two main categories:

Class I — Earthed Equipment

Class I appliances have a metal casing and rely on an earth connection as a safety mechanism. If the live conductor contacts the casing, the earth path carries the fault current away and should trip the circuit breaker. Examples include many corded power drills, angle grinders, kettles, toasters, and desktop computers. Class I equipment requires both a visual inspection and an earth continuity test as a minimum.

Class II — Double-Insulated Equipment

Class II appliances have reinforced or double insulation and do not rely on an earth connection. They are marked with the double-square symbol. Most modern cordless power tools, phone chargers, laptop chargers, and many extension leads are Class II. Because there is no earth to test, Class II equipment requires a visual inspection and an insulation resistance test.

How Often Does Equipment Need Testing?

There is no single mandated interval. The Health and Safety Executive's guidance (IET Code of Practice for In-Service Inspection and Testing of Electrical Equipment, 5th edition) sets out recommended frequencies based on the type of equipment and the environment in which it is used. The riskier the environment, the more frequent the testing.

These are recommendations, not legal minimums. You can justify a different interval if your risk assessment supports it. A robust PAT testing programme records the interval, the rationale for it, and the results — so that if the HSE or an insurer asks, you can demonstrate a systematic approach.

If you are a tradesperson working on construction sites, note that most principal contractors expect your power tools and extension leads to carry PAT labels no more than three months old. Arriving on site with out-of-date labels will commonly result in equipment being refused and you being asked to leave until it is corrected.

Who Can Carry Out PAT Testing?

Legally, PAT testing must be carried out by a “competent person.” There is no specific qualification required by statute — the HSE does not mandate a certificate or a registered body. A competent person is someone with the technical knowledge, practical experience, and understanding of the relevant standards to carry out the work without risk to themselves or others.

In practice, most businesses use one of the following:

• A qualified electrician — already competent by definition, familiar with electrical safety standards, and often the most credible choice for high-risk environments.
• A dedicated PAT tester — someone who has completed a recognised PAT testing course (from organisations such as the IET, City & Guilds, or EAL) and holds a PAT testing instrument. Courses typically run one to two days and cover visual inspection, use of the test instrument, record keeping, and the relevant standards.
• An in-house trained employee — for large organisations with significant appliance volumes, training a member of staff as a competent in-house PAT tester is cost-effective. The training must be documented and the person must understand the limits of their competence.

A sole trader PAT testing their own tools is generally accepted, provided they have the knowledge and a calibrated test instrument. Buying a PAT tester and applying labels without understanding what the readings mean is not competent practice and provides no legal protection.

What Happens During a PAT Test?

A full PAT test involves two stages:

1. Visual Inspection

This is carried out before any electrical test. The tester checks:

• The plug: correct fuse rating, no signs of overheating, no cracked or damaged casing, pins not bent or corroded.
• The cable: no cuts, kinks, fraying, or bare conductors; cable grip intact at both the plug and the appliance entry point.
• The appliance body: no cracks, no evidence of overheating, no missing covers or guards, no signs of liquid ingress.
• The connections: where visible, internal wiring correctly colour-coded and securely terminated.

A significant proportion of faults — the IET estimates around 90% of electrical faults in portable appliances — are detectable by visual inspection alone. If an item fails the visual inspection, it fails the PAT test immediately and no electrical tests are required.

2. Electrical Tests

The tester connects the appliance to a PAT testing instrument and runs a series of automated tests. For Class I equipment, the key tests are:

• Earth continuity — checks that a low-resistance path exists between the earth pin and any accessible metal parts of the appliance. A high reading indicates a broken or poorly connected earth.
• Insulation resistance — applies a high DC voltage between the live and neutral conductors (shorted together) and earth, and measures the resistance of the insulation. A low reading indicates degraded insulation that could allow fault current to reach the casing.

For Class II equipment, the earth continuity test is replaced with a check that there is no accessible earth connection, and the insulation resistance test is still applied. Some PAT testers also conduct a protective conductor current test and a touch current test, which are more sensitive indicators of subtle insulation degradation.

PAT Test Certificates and Record Keeping

After testing, you need a record. The record serves two purposes: it demonstrates ongoing compliance to the HSE, your insurers, or a principal contractor, and it forms the basis of your retest schedule.

A PAT test record should include for each appliance:

• A unique asset identifier (asset number, serial number, or description).
• The make, model and type of appliance.
• The location or job it is assigned to.
• The date of testing.
• The test results (earth continuity reading, insulation resistance reading, and any other tests conducted).
• Pass or fail.
• The name of the tester and, ideally, their qualification.
• The next retest date.

There is no legally mandated retention period for PAT records, but keeping records until the next test date plus at least two years is prudent. In practice, many businesses keep records for five years. A physical label on the appliance is not a substitute for a written or digital record — it is a supplement to it.

How Much Does PAT Testing Cost?

PAT testing is priced per item, with bulk discounts for larger volumes. In 2026, typical per-item rates from a professional PAT tester are:

• 1–50 items: £1.50 – £3.00 per item, plus a call-out charge of £30 – £75.
• 51–200 items: £1.00 – £2.00 per item, call-out usually waived.
• 200+ items: £0.50 – £1.50 per item, often with a fixed-price annual contract.

For a small trades business with 20–30 tools and extension leads, annual PAT testing might cost £80–£150. For a contractor with a fleet of vehicles each carrying tool kits, the bill will be higher but is still a minor overhead compared to the insurance and liability exposure of untested equipment.

If you test in-house, the main costs are the PAT tester instrument (£200–£600 for a quality unit), calibration (typically £50–£100 per year), and the time of the person doing the testing. Many businesses find that once volume exceeds 100–150 items, in-house testing pays for itself quickly.

Common PAT Test Failures and What They Mean

Understanding why equipment fails helps you make better purchasing decisions and spot problems earlier. The most frequently failed items and failure modes are:

• Extension leads with damaged cables or no grip at the plug. Heavy-duty extension leads designed for construction use are significantly more durable than domestic ones. Using a domestic extension lead on a building site is a false economy.
• Incorrect fuse in the plug. A 13A fuse in an appliance rated at 3A or less means a fault current far below the fuse rating will not blow the fuse — the cable or appliance will overheat instead. The fuse should be as close to the appliance rating as possible.
• Failed earth continuity on Class I tools. Often caused by a broken earth conductor inside the cable, particularly at the point where the cable enters the tool body. The cable may look undamaged externally.
• Low insulation resistance on older tools. Degraded insulation from age, moisture or physical damage. A reading below 1 MΩ at 500V is typically a fail and indicates potential shock risk.
• Burns or heat damage on plugs. Indicates the appliance has been drawing more current than expected, or the plug connections have worked loose. Always a visual fail.
• Cracked or missing cable grips. Without cable grip, the conductors inside the plug take the mechanical stress of the cable and will eventually pull loose — potentially exposing live conductors.

When an item fails, it should be removed from use immediately, labelled as failed, and either repaired by a competent person or disposed of. Failed items should never simply be re-labelled or left in the pool of available equipment.

PAT Testing and Your Insurance

Many public liability and employers' liability insurance policies include conditions requiring that electrical equipment is properly maintained. If a piece of equipment causes injury or fire and you cannot demonstrate a current PAT testing regime, your insurer may have grounds to reduce or refuse your claim. Check your policy wording. “Properly maintained” in an insurance context almost always means tested at appropriate intervals and records kept.

On commercial sites, many principal contractors require evidence of PAT testing — typically a copy of your PAT test register or a confirmation letter from the tester — as part of their pre-qualification process. Without it, your tools may not be allowed on site.