The health and safety file is one of the most important documents produced during a construction project, yet it is also one of the most frequently misunderstood and poorly executed. Required under the Construction (Design and Management) Regulations 2015, the file is intended to serve a vital practical purpose: providing essential health and safety information to anyone who needs to carry out future construction work, maintenance, cleaning, or demolition on the building.
In practice, too many health and safety files are compiled as an afterthought in the final weeks of a project, resulting in incomplete, poorly organised documents that fail to serve their intended purpose. This guide explains how to build a genuinely useful health and safety file throughout the construction process.
- The Legal Requirement
- What the File Should Contain
- Building the File Progressively
- What Not to Include
The Legal Requirement
Under CDM 2015, the principal designer is responsible for preparing and developing the health and safety file. However, the principal contractor must provide information needed for the file, and all designers and contractors have a duty to provide information relating to their work that is relevant to future health and safety risks.
The file must be passed to the client at the end of the project. The client then has a duty to keep it available for inspection by anyone who needs it for subsequent construction work on the building. If the building is sold, the file must be passed to the new owner.
The regulations do not prescribe a specific format for the file. They require that it contains information about the project that is likely to be needed to ensure health and safety during any subsequent construction work. This gives considerable flexibility in how the file is structured, but it also means there is no standard template to follow -- which is partly why quality varies so widely.
What the File Should Contain
The HSE guidance on CDM 2015 provides helpful direction on what the health and safety file should include. The content should be proportionate to the risks involved and focused on information that would not be available through other sources.
As-Built Information
- As-built drawings showing the final arrangement of the structure, including any deviations from the original design
- Structural details including foundation types and depths, structural frame details, and load-bearing elements
- Service routes for electrical, gas, water, drainage, and communication installations, including concealed runs
- Fire protection details including compartmentation lines, fire-stopping locations, and fire-rated elements
Design and Construction Information
- Design principles and assumptions that are relevant to future work, including structural loading assumptions and design life
- Key structural design criteria that must be maintained during any future alterations
- Details of any hazardous materials used in or remaining in the structure, including asbestos (in refurbishment projects), lead paint, or contaminated land
- Details of pre-stressed or post-tensioned elements that could present a danger if cut or drilled
Critical principle: The file should contain information that someone carrying out future work on the building would need to know but would not be able to discover through normal investigation. If the information is obvious from inspection (such as the type of roof covering) it does not need to be in the file. If it is concealed or non-obvious (such as the location of buried services or the presence of hazardous materials), it must be.
Maintenance and Operation Information
- Safe systems of work for maintenance activities that carry specific risks, such as cleaning at height, accessing confined plant rooms, or working on live electrical systems
- Information about specialist installations including safe access arrangements, isolation procedures, and maintenance requirements
- Details of residual hazards that could not be designed out and the measures needed to manage them
- Arrangements for safe access to areas requiring regular maintenance, including roof access, facade cleaning anchor points, and elevated plant installations
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The single most important principle for producing a good health and safety file is to build it progressively throughout the project, not retrospectively at the end. Information is most readily available and most accurate at the point when the relevant work is being carried out.
Pre-Construction Phase
The principal designer should establish the file structure and begin populating it with pre-construction information: site investigation reports, asbestos surveys (for refurbishment projects), existing as-built information, and any design decisions specifically informed by health and safety considerations.
Construction Phase
As each element of work is completed, the relevant information should be captured and added to the file. When foundations are poured, record the type, depth, and any unusual ground conditions encountered. When services are installed, capture the route and depth of concealed runs before they are covered up. When specialist systems are commissioned, obtain the maintenance requirements and safe access information.
The site manager plays a crucial role in this process. You are in the best position to capture information as work progresses, to prompt subcontractors to provide their contributions, and to identify elements that the principal designer might not be aware of because they are not on site daily.
Practical Approaches to Information Capture
Make it easy for subcontractors to contribute. Provide a simple template or pro-forma that they can complete for each work package, covering the information needed for the health and safety file. Include the requirement for file contributions in subcontract orders and pre-start meeting agendas.
Use photographs extensively. A photograph of a concealed service run, with a scale reference and clear location information, is often more useful than a written description. Photograph elements before they are covered up, and ensure the photographs are clearly labelled and georeferenced or linked to a drawing reference.
Maintain a tracking log that records which work packages have provided their health and safety file contributions and which are outstanding. Review this at monthly progress meetings to maintain pressure on compliance and identify gaps before they become difficult to fill retrospectively.
What Not to Include
A common mistake is to include everything -- making the file so voluminous that the useful information is buried in hundreds of pages of irrelevant material. The CDM regulations are explicit that the file should contain information that is proportionate to the risks involved.
The file should not include the construction phase plan (that served its purpose during construction), generic risk assessments and method statements that were specific to the construction phase, routine correspondence, or general product literature that does not relate to specific health and safety information for future work.
A focused, well-organised file of 50 pages is far more useful than a disorganised collection of 500 pages that nobody will ever read effectively.
Digital Health and Safety Files
Increasingly, health and safety files are being produced and maintained digitally rather than as physical documents. Digital files offer significant advantages: they are searchable, they can incorporate hyperlinks between related sections, they can include video and photographic content that is impractical in paper format, and they can be updated more easily as building information changes over time.
AI-powered document management tools can assist with organising and maintaining health and safety files, automatically categorising new information, flagging gaps in coverage, and generating summaries that help building owners and maintenance teams quickly find the information they need.
Whatever format you choose, the underlying principle remains the same: the health and safety file exists to protect people who will work on the building in the future. Build it with that purpose clearly in mind, and the result will be a document that genuinely fulfils its intended role.
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