CDM 2015 vs the Building Safety Act: What’s the Difference?
The UK construction industry has seen a significant shift in how it approaches safety, accountability, and competence. Two important pieces of legislation sit at the heart of this conversation: the Construction (Design and Management) Regulations 2015 (CDM 2015) and the Building Safety Act 2022.
Although both aim to improve safety, they serve different purposes. Understanding how they work together is essential for clients, designers, contractors and construction professionals.
Two frameworks, different responsibilities
CDM 2015 focuses on managing health and safety throughout construction work. It requires those involved in a project to identify foreseeable risks, coordinate their activities and take appropriate steps to protect workers and others affected by the work.
The Building Safety Act 2022 strengthens the regulatory framework for building safety, with particular emphasis on higher-risk buildings, building regulations compliance and accountability across the building lifecycle. Its associated regulations set specific duties for those responsible for design and construction.
Put simply, CDM focuses on managing health and safety risks during construction, while the Building Safety Act framework places greater emphasis on ensuring buildings meet applicable safety and regulatory requirements.
The principal designer: one title, two distinct roles
One of the most important distinctions concerns the principal designer’s role.
Under CDM 2015, the principal designer plans, manages, monitors and coordinates health and safety during the pre-construction phase, helping ensure foreseeable risks are addressed through design decisions.
Under the Building Safety Act framework, the principal designer has a different responsibility: planning, managing, and monitoring design work to ensure compliance with relevant building regulations.
The titles are the same, but the duties and competency requirements differ. One individual or organisation may undertake both roles, provided they meet the relevant requirements and are appointed appropriately.
This is where confusion can arise. Assuming that an appointment under one framework automatically satisfies the other can leave important responsibilities unaddressed.
Why does this matter for construction professionals?
The distinction is more than regulatory terminology. It affects how projects are planned, how responsibilities are allocated, and how teams share information.
Clients need to understand their appointment obligations. Designers must recognise how their decisions affect both construction health and safety and compliance with building regulations. Contractors need clear responsibilities and effective coordination throughout delivery.
Ultimately, compliance depends on more than appointing the right people. It requires individuals to understand their duties, demonstrate appropriate competence and work collaboratively.
Building competence is key
As the regulatory landscape evolves, professional development becomes increasingly important. Construction professionals need to keep their knowledge current and understand how different regulatory frameworks apply to their roles and projects.
Training can help clarify responsibilities, strengthen decision-making and support better coordination between duty holders. View it not simply as a compliance exercise, but as an investment in safer, better-managed construction.
How can Synergie Help
We support construction professionals in developing the knowledge and confidence needed to navigate an evolving regulatory landscape. Through our specialist training courses, including CDM 2015 and Building Safety Act training, we help individuals and organisations better understand their responsibilities, strengthen their competence and apply their learning in practice.
Whether you’re looking to refresh your existing knowledge or develop a deeper understanding of your role, Synergie can help you take the next step towards safer, more compliant construction projects.
Explore Synergie’s training courses to find the right development opportunities for you or your team.
The takeaway: CDM 2015 and the Building Safety Act framework are complementary, not interchangeable. Understanding the difference is an important step towards building a culture where safety, accountability and competence are embedded from the earliest design decisions through to project completion.
At Synergie, developing the knowledge and skills of construction professionals is central to supporting this approach. Understanding your responsibilities is the starting point for putting them into practice.
This article provides general information, not legal advice. Project teams should consult the applicable legislation and official guidance to establish their specific duties.