The Health and Safety Executive does not make appointments. An HSE inspector can arrive at any construction site in Great Britain without notice, at any time work is being carried out, and demand access to the site, your workers, and your documentation. Obstructing an inspector is a criminal offence. So is providing false information. The visit starts on their terms, and the outcome depends almost entirely on what they find in the first 30 minutes.
For small and medium construction firms, understanding the HSE enforcement process is not optional. It is the difference between a routine inspection that costs nothing and one that generates a fee for intervention bill, an improvement notice, a prohibition notice, or a prosecution. Each level of enforcement escalates the financial and operational consequences significantly.
HSE construction inspections are triggered by four mechanisms:
The F10 notification is worth understanding. Under CDM 2015, the client must notify HSE when a construction project will last longer than 30 working days and have more than 20 workers on site at any one time, or when the project exceeds 500 person days. The F10 notification tells HSE that a project exists, where it is, who the principal contractor is, and when work starts. It is effectively an invitation for HSE to visit. Failure to submit an F10 when required is itself a breach.
An HSE inspector arrives on site and identifies themselves. They will ask to speak to the site manager or principal contractor's representative. They will walk the site, observe work in progress, and speak to workers. They will ask to see documentation. The entire process typically takes 2 to 4 hours for a straightforward inspection, longer if they find problems.
Inspectors are trained to observe before they ask. They will note whether workers at height have edge protection. Whether scaffolds have scaffold tags. Whether excavations are shored. Whether workers are wearing appropriate PPE. Whether there is visible dust without extraction. Whether welfare facilities exist and are accessible. These initial observations determine the direction of the inspection.
The documentation check follows. Inspectors will ask for:
If the documentation is in order and no site hazards are observed, the inspection ends with no further action. That is the best possible outcome. It costs you nothing except the time spent with the inspector.
If the inspector identifies a material breach of health and safety law, the Fee for Intervention (FFI) scheme activates. Introduced in 2012, FFI means that HSE recovers the costs of its enforcement activity from the duty holder who committed the breach. The current rate is 163 per hour.
A material breach is any contravention of health and safety law that the inspector records in writing. It does not need to be serious. It does not need to have caused harm. An out-of-date COSHH assessment, a missing scaffold inspection record, or a generic risk assessment that is not site-specific can all constitute material breaches.
FFI costs accumulate from the moment the breach is identified. The inspector's time on site, the time spent writing up the findings, the time spent reviewing your response, follow-up correspondence, and any subsequent visit to verify compliance are all charged at 163 per hour. A straightforward breach that takes the inspector 4 hours in total generates an FFI invoice of 652. A more complex case involving multiple breaches, correspondence over several weeks, and a follow-up inspection can easily reach 2,000 to 5,000.
| Scenario | Inspector time | FFI cost at £163/hr |
|---|---|---|
| Single documentation breach, resolved on site | 3-4 hours | £489-652 |
| Multiple documentation breaches, written notification | 8-12 hours | £1,304-1,956 |
| Improvement notice with follow-up inspection | 15-25 hours | £2,445-4,075 |
| Prohibition notice plus investigation | 30-60 hours | £4,890-9,780 |
FFI invoices are not optional. They are legally enforceable. You can dispute them through a formal process, but the grounds for dispute are narrow: you must demonstrate that no material breach occurred or that the time charged was unreasonable. Disagreeing with the inspector's interpretation of the law is not, by itself, sufficient grounds.
An improvement notice is a formal legal document requiring you to remedy a contravention of health and safety law within a specified period, typically 21 days. The notice specifies the breach, the regulation contravened, and what you must do to comply. It is served in writing and can be appealed to an employment tribunal within 21 days of service.
Improvement notices are issued when the inspector identifies a breach that does not pose an immediate risk of serious injury but needs correcting. Common examples in construction include: missing or inadequate risk assessments, out-of-date COSHH assessments, no training records for workers carrying out high-risk activities, and inadequate welfare facilities.
Failure to comply with an improvement notice by the deadline is a criminal offence. The inspector will visit to check compliance after the deadline. If the breach has not been remedied, prosecution follows almost automatically.
Improvement notices are published on HSE's public register. Anyone can search it by company name. Clients, principal contractors, and procurement departments routinely check this register when evaluating subcontractors.
A prohibition notice stops work immediately. It is issued when an inspector believes there is a risk of serious personal injury from an activity being carried out on site. The notice can prohibit a specific activity (working at height without edge protection, for example) or shut down an entire site in extreme cases.
Work cannot resume until the inspector is satisfied that the risk has been eliminated. For a small builder, a prohibition notice can mean the entire workforce standing idle while the problem is resolved, scaffolding is erected, or equipment is obtained. The direct cost of lost productivity on a stopped site is typically 1,000 to 5,000 per day depending on the size of the workforce and the contractual penalties for delay.
Prohibition notices are also published on HSE's public register and carry significant reputational consequences.
Prosecution is reserved for the most serious breaches: fatalities, major injuries, persistent non-compliance, and failure to comply with enforcement notices. HSE refers cases to its legal team, which decides whether to prosecute based on the evidential test and the public interest test.
Construction accounts for a disproportionate share of HSE prosecutions. The Sentencing Council guidelines, effective since 2016, link fines to the offender's turnover. For a micro-business with turnover under 2M, a serious health and safety offence starts at 20,000 to 50,000. For medium businesses, fines routinely exceed 100,000. For large businesses, fines of 1M or more are common for fatalities.
Individual directors and managers can be prosecuted personally under Section 37 of the Health and Safety at Work etc. Act 1974 if the offence was committed with their consent, connivance, or neglect. Custodial sentences are rare but possible, particularly for manslaughter by gross negligence following a fatality.
The only way to prepare for an unannounced inspection is to be compliant before the inspector arrives. That means maintaining your documentation in real time, not assembling it when you hear the inspector is on site.
The practical minimum for every active site:
These are the documents the inspector asks for in the first 15 minutes. If they are on site, organised, current, and site-specific, the inspection is likely to end with no enforcement action. If they are missing, incomplete, or back at the office, you are already accumulating FFI charges.
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