Pre-construction information

What should pre-construction information contain?

Short answer

HSE guidance says that when complete, pre-construction information must include proportionate information about the project, such as the client brief and key dates; the planning and management of the project, including resources, time and the arrangements for cooperation and coordination; the health and safety hazards of the site, including design and construction hazards and how they will be addressed; and any relevant information in an existing health and safety file. On a small project that is a short document, not a long one.

The four required headings

  1. The project

    What is being built, the client brief, and the key dates of the construction phase.

  2. Planning and management

    The resources and time allocated to each stage, and the arrangements for cooperation between dutyholders and for coordinating the work.

  3. The health and safety hazards of the site

    Including design and construction hazards, and how they will be addressed. This is usually the longest section and the one that earns the document its place.

  4. Anything relevant in an existing health and safety file

    From earlier work on the building. Often overlooked, and often the single most useful document available.

What that looks like on a domestic extension

A worked list. Not every item applies to every project, which is the point of proportionality.

TopicThe question it answers
The buildingAge, construction, condition, and what is known versus assumed
OccupationWhether anyone is living or working there during the works
AccessHow people, materials, plant and waste get in and out, and past what
NeighboursAdjoining occupiers, shared access, party wall interfaces, the public footpath
AsbestosFor a building of the relevant age: the survey, the findings, or the absence of both
StructureWhat is loadbearing, what is being removed, what has to be propped and in what order
ServicesIncoming supplies, meter positions, concealed and buried runs, isolation points
Work at heightRoof levels and edges the design creates, and fragile surfaces
GroundWhere there is excavation, underpinning or a basement, including known ground conditions and nearby foundations
Fire and escapeHow escape works while the building is opened up
Design residual risksWhat each designer could not eliminate, and what they expect to be done about it
The fileWhat the project should leave behind for the building

Build a project specific version of this list with the free checklist tool.

Length is not the measure

HSE guidance asks for information that is in a convenient form and clear, concise and easily understandable, to help other dutyholders carry out their duties. A twelve page pack that a builder skims is worth less than three pages they act on.

A test that works. Take each paragraph and ask what somebody would do differently for having read it. If the answer is nothing, it is padding. If the answer is something specific, it is the reason the document exists.

What good looks like on the hard bits

Asbestos. Not a paragraph of general law. Either the survey and what it found, or a clear statement that no survey exists, that the building is of an age where asbestos containing materials are likely, and who is commissioning what before the relevant work begins.

Structure. Not that structural work is dangerous. The engineer's actual sequence, the propping requirement, and any maximum unsupported length or hold point in the design.

Neighbours. Not that care should be taken. That number 42 uses the side return every morning, or that the scaffold has to oversail the neighbour's garden and the agreement is or is not in place.

Written by Robbie Thompson, BA (Hons) Dip Arch, SMSTSLast reviewed 28 August 2026How we write this

Sources

  1. CDM 2015, regulation 4: client duties in relation to managing projects legislation.gov.uk
  2. CDM 2015, regulation 11: duties of a principal designer legislation.gov.uk
  3. Managing health and safety in construction, L153 HSE guidance on the Regulations

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