Prequalifying a principal designer under CDM 2015

On a construction project involving, or likely to involve, more than one contractor, the client must appoint a principal designer for the pre-construction phase. Choosing a familiar design practice or a firm with a general accreditation is not enough by itself. The client needs to establish that the proposed person or organisation can perform the principal-designer functions for this project.

HSE describes the CDM principal designer as a designer with control over the pre-construction phase and the relevant skills, knowledge and experience; an organisation must also have the capability to fulfil the role. Its principal-designer guidance is the starting point. This article concerns the CDM 2015 role across Great Britain. England's building-regulations principal designer is a separate legal role with different competence requirements; do not merge their appointments or evidence simply because both use the same title. GOV.UK explicitly distinguishes them.

Establish what the appointee will control

Ask which design disciplines and parties will contribute, what information the client can provide and when design risks must be coordinated. A proposed principal designer needs enough control of the pre-construction phase to plan, manage, monitor and coordinate that work. A design consultant with an attractive CV may not have the authority, resources or appointment duration needed to do it.

Check the proposed contract and reporting line: who will lead coordination, issue design-risk information, challenge missing inputs, liaise with the principal contractor and manage changes continuing into construction? HSE's CDM FAQ says the appointee must have the right mix of skills, knowledge, experience and, for an organisation, organisational capability for the project in hand.

Request evidence matched to the project

Use proportionate questions rather than a fixed certificate list:

These are editorial selection prompts, not a statutory questionnaire. Examine who delivered the referenced work, not merely the brand on the case study. A current CAS or SSIP assessment can support organisational prequalification where relevant, but HSE's conformity-assessment guidance says it does not prove suitability for the specific site. Our generic competence-versus-accreditation guide addresses that broader boundary.

Record the appointment decision and the handover

Record the appointment scope, candidate entity, assessed evidence, key gaps, reviewer, decision and the role's start and expected end. If a different person will fulfil England's building-regulations principal-designer role, identify that separately where applicable. Ask a qualified adviser about the two appointments if the project documents are unclear.

HSE's CDM guidance explains that the appointment duration should account for design work continuing into construction, and the client must ensure the principal contractor is briefed if the principal designer's appointment finishes before the project. An early “approved” tick must therefore feed into actual coordination and transfer of design-risk information. The prequalification-to-mobilisation guide covers the general approval transition.

If considering contractor prequalification software, ask the vendor to demonstrate role-specific evidence, the named decision maker and a separate handover record. This article does not claim Complys appoints a principal designer, verifies statutory competence or decides whether a project satisfies CDM requirements.

Primary sources and integration gate

• HSE — Are you a principal designer?, CDM FAQ and CDM guidance L153: role, capability and appointment duration.
• GOV.UK — Design and building work: distinct England building-regulations role.
• HSE — Conformity assessment schemes: accreditation does not replace project-specific assessment.

Before integration: Check the whole live CDM and competence-guide estate. If a current owner already fully answers this CDM principal-designer appointment task, merge this material there. Verify any England building-regulations claim against the current separate regime at publication.