Confined Space Entry PermitsWhat Contractors Need to Know
Formal permit-to-work documents required before anyone enters a confined space on a construction site.
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What Are Confined Space Entry Permits?
A confined space entry permit is a formal written authorisation that must be issued before any worker enters a confined space — such as manholes, tanks, chambers, ducts, pipes, or excavations with restricted access. The permit documents the hazards identified (toxic gases, oxygen depletion, flooding), the control measures in place (ventilation, gas monitoring, rescue arrangements), the personnel authorised to enter, and the time limits for the entry. It is part of a permit-to-work system that ensures every confined space entry is planned, controlled, and supervised.
Why Confined Space Entry Permits Matter
Confined spaces kill construction workers every year — often multiple workers in a single incident when rescuers enter without proper precautions. The fatality rate for confined space incidents is disproportionately high because the hazards (toxic atmospheres, oxygen depletion) are invisible and can incapacitate a worker within seconds. A robust permit-to-work system with properly completed entry permits is the primary defence against these fatal scenarios. HSE treats confined space failures as among the most serious construction offences.
This guide is for informational purposes only. ContractorVault does not provide compliance advice, certify documents, or approve compliance status. Always consult a qualified professional for specific regulatory requirements.
What You Need to Know
UK Regulation
Confined Spaces Regulations 1997(external link)Review Frequency
Per entry — a new permit is required for each confined space entry
Related Documents
Free compliance checklist — covers Confined Space Entry Permits and every other document
Most UK contractors track subcontractor compliance in spreadsheets with gaps. This checklist covers every document you should be collecting, organised by category, so nothing slips through.
- Insurance certificates — ELI, PLI, and what cover amounts to check
- CSCS cards — which card for which role, and expiry tracking
- RAMS and method statements — what to collect and how to version them
- SSIP accreditations — CHAS, Constructionline, SafeContractor and more
- Training certificates — SMSTS, first aid, asbestos awareness with renewal periods
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Frequently Asked Questions — Confined Space Entry Permits
What counts as a confined space on a construction site?
A confined space is any enclosed or substantially enclosed area where there is a foreseeable risk of serious injury from hazardous conditions. In construction, this includes manholes, inspection chambers, underground tanks, deep excavations, tunnels, large-diameter pipes, and partially enclosed areas where gases could accumulate. The risk — not just the physical space — determines whether it is a confined space.
What must a confined space entry permit include?
A properly completed permit should specify the location of the confined space, the work to be carried out, the hazards identified, atmospheric monitoring results, control measures in place, ventilation arrangements, rescue plan and equipment, the names of authorised entrants and the top-person, the authorising person's signature, and the time limit for the entry.
Can a confined space entry permit cover multiple entries?
Permits should generally cover a single entry or a defined period of continuous work. If conditions could change between entries — for example, in a sewer or tank where atmospheric conditions fluctuate — a new permit should be issued for each separate entry. The permit is only valid while the stated conditions and controls remain in place.
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