The CDM responsibilities businesses must address before construction starts

Some of the most consequential CDM decisions are made when a construction site does not yet exist.

A Principal Designer appointed after key design choices have been fixed has less room to influence them. Missing information about an existing building can carry assumptions into design and tender. A programme agreed without enough time for proper planning can create pressure before the first contractor arrives.

Under the Construction (Design and Management) Regulations 2015 (CDM 2015), commercial clients retain direct responsibilities for how construction work is planned and managed. Their influence begins through appointments, information, programme and resources, while much of the project still exists on drawings and procurement schedules.

For businesses commissioning refurbishments, extensions, fit-outs or other construction work, this early stage deserves more attention than it sometimes receives.

The client’s role starts before construction

Commercial clients are required to make suitable arrangements for managing construction projects. That means giving the work enough time and resource, making relevant pre-construction information available and ensuring suitable welfare arrangements are considered before construction begins.

The information provided can shape decisions long before anybody reaches site. Existing drawings, asbestos information, structural details, known services, access constraints and records of previous works can all affect how designers and contractors approach the project. Discovering a gap once work has started may mean revisiting design, sequencing or cost at a point when there is far less room to manoeuvre.

Appointments matter for the same reason.

Where a project involves, or is likely to involve, more than one contractor, the client must appoint a Principal Designer and Principal Contractor. The Principal Designer plans, manages and coordinates health and safety during the pre-construction phase, while the Principal Contractor takes on corresponding responsibilities during construction.

The timing of those appointments changes what those people can realistically influence. A Principal Designer brought in after major design decisions have already been fixed is working within constraints that may be difficult or expensive to revisit.

This is where the client’s role becomes practical rather than procedural. The value sits in getting the project set up correctly before decisions harden.

Why appointing a contractor does not settle the CDM position

The contractor may know CDM inside out. The client may encounter it once every few years.

That difference matters.

A contractor can manage site activity, coordinate trades and control many of the risks created by construction work, but its appointment does not transfer the commercial client’s statutory duties.

For an occasional client, the risk is not usually a lack of willingness to comply. It is the assumption that the specialist construction team will naturally pick up everything that needs doing.

The client still needs confidence that the right dutyholders have been appointed, sufficient information has been provided and the project has been given realistic time and resources.

When those points are missed, the consequences tend to show up later in the project rather than in the paperwork.

An incomplete survey can affect design decisions. An unrealistic programme can create sequencing pressure. Unclear appointments can leave responsibility blurred at the point somebody needs to take ownership.

By then, the problem has already moved beyond administration.

When is an F10 notification required?

An F10 notification is required when a construction project meets the notification thresholds under CDM 2015.

A project is notifiable when it is scheduled to last longer than 30 working days and have more than 20 workers working simultaneously at any point, or when it is expected to exceed 500 person-days.

For projects meeting those thresholds, the client is responsible for notifying the Health and Safety Executive (HSE) or other relevant enforcing authority as soon as practicable before the construction phase begins.

The requirement for an F10 notification should be identified while the programme and expected workforce are being established. Leaving it until shortly before mobilisation creates an avoidable rush around something that can usually be determined much earlier.

The F10 threshold only decides whether notification is required.

A project can sit below both thresholds and still be subject to CDM 2015, including duties around appointments, planning, information and management. The absence of an F10 should never be taken as evidence that the wider CDM position has been dealt with.

Before mobilisation, the project should already make sense

By the time construction is ready to begin, there should be no uncertainty over who holds the main CDM duties or what information the project team is working from.

The relevant dutyholders should be appointed and understand their roles. Designers and contractors should have the information needed to make informed decisions. A suitable Construction Phase Plan should be in place before the construction phase begins, and the programme should reflect the work involved rather than simply the preferred completion date.

Those arrangements will also be tested as the project develops.

Designs change. Programmes move. Additional contractors can become involved. Information that appeared sufficient at tender stage may prove incomplete later.

For commercial clients, that is why CDM belongs alongside scope, procurement, programme and cost from the beginning of a project, not as a compliance exercise added shortly before work starts.

The strongest position is reached before mobilisation: clear appointments, useful information, realistic resources and an early understanding of any F10 requirement. Once the site is active, correcting weaknesses in those areas usually becomes harder.