Should You Act as Principal Designer?

Should You Act as Principal Designer? Pros and Cons

Lee Marsden

July 20, 2026

Lee Marsden

July 20, 2026

Under the Construction (Design and Management) Regulations 2015 (CDM), every project requires a Principal Designer when more than one contractor is involved. This role is critical for managing health and safety during the design phase, but many contractors and clients still underestimate what it involves.

At Majestic Construction, we often get asked whether clients or contractors should take on the Principal Designer role themselves, or whether to appoint a specialist. The answer depends on competence, capability, and control.

Here is a practical look at the pros and cons of taking on the Principal Designer role in 2026.

What Does a Principal Designer Do?

The Principal Designer (PD) is responsible for planning, managing, monitoring, and coordinating health and safety during the pre-construction phase. Their goal is to ensure that risks are eliminated or controlled through design.

Key duties include:
– Reviewing and assessing design information for safety risks.
– Coordinating between designers, contractors, and clients.
– Ensuring the pre-construction information is complete and up to date.
– Preparing and handing over relevant information for the health and safety file.
– Supporting the Principal Contractor during construction.

In short, the PD ensures that safety is designed in, not retrofitted later.

The Pros of Acting as Principal Designer

Taking on the PD role can offer several benefits, particularly for experienced contractors and design-led firms.

Advantages include:
– Greater control over design and build coordination.
– Improved communication between design and delivery teams.
– Streamlined decision-making and reduced delays.
– The opportunity to provide a more integrated service to clients.
– Enhanced reputation through compliance and leadership.

For those with the right competence, it can be a logical and profitable extension of their existing services.

The Cons and Common Pitfalls

However, the PD role comes with significant responsibility and legal duty. Misunderstanding or underestimating the role can lead to serious issues, including enforcement notices and liability for accidents.

Common pitfalls include:
– Taking on the PD role without sufficient design competence.
– Poor documentation or communication between parties.
– Failing to identify and control design risks early.
– Lack of understanding of CDM responsibilities and record-keeping.

If these elements are not managed correctly, the role can create more risk than reward.

How Majestic Construction Manages the Role

Majestic Construction has acted as both Principal Designer and Principal Contractor on a wide range of projects. Our experienced team ensures full compliance through structured processes and proactive collaboration.

Our PD services include:
– Reviewing design information for buildability and safety.
– Coordinating design risk reviews and CDM documentation.
– Preparing pre-construction information and safety files.
– Providing client and designer CDM briefings.
– Integrating PD duties seamlessly with Principal Contractor responsibilities.

This joined-up approach ensures clarity, accountability, and compliance from design through to delivery.

Real Example

On a commercial redevelopment in Leeds, Majestic Construction acted as both PD and PC. Early involvement allowed us to eliminate complex access risks during the design stage and simplify the construction sequence. The result was a safer build, fewer delays, and a satisfied client.

For projects where design and construction are closely linked, combining PD and PC roles can create significant efficiencies – provided the competence is there.

Why This Matters

Understanding the Principal Designer role is essential for compliance under CDM 2015. Appointing the right person, or ensuring you have the right competence internally, protects both your workforce and your reputation.

How Majestic Construction Can Help

Majestic Construction provides expert support for clients and contractors taking on the Principal Designer role, including:
– Acting as appointed Principal Designer or Principal Contractor.
– CDM compliance audits and documentation reviews.
– Design risk workshops and pre-construction coordination.
– Ongoing client and designer training and support.

With our combined design, construction, and compliance expertise, we make CDM management simple and effective.

Call 01484 426302 or email lee@majesticconstruction.co.uk to discuss your Principal Designer requirements.

Majestic Construction – Designing safety into every project.