Construction, (Design and Management) Regulations (CDM 2015)

Protecting People, Projects and Compliance Across the Construction Lifecycle

The Construction (Design and Management) Regulations 2015 (CDM 2015) form the cornerstone of health, safety and welfare management across the UK construction industry. They apply to every construction project, regardless of size or complexity, and place clear legal duties on clients, designers, contractors and supply chain partners.

Effective CDM compliance is not simply about meeting regulatory requirements. It is about early planning, competent appointments, clear communication and sustained leadership, all of which directly influence safety outcomes, programme certainty and commercial performance.

Since CDM 2015 came into force, enforcement action has continued to rise. There have now been over 190 prosecutions under CDM 2015, with cumulative fines exceeding £16 million. Recent cases have included individual fines of up to £900,000, underlining the courts’ increasing focus on effective planning, governance and client oversight.

What is CDM 2015?

CDM 2015 is the primary set of regulations governing how health and safety risks are managed throughout the life of a construction project.

It applies to all construction work, including:

• New build and demolition
• Refurbishment, extensions and alterations
• Engineering and infrastructure projects
• Maintenance and repair works
• Decommissioning and dismantling activities

The regulations define responsibilities for five duty holders:

• Commercial Client
• Principal Designer
• Designer
• Principal Contractor
• Contractor

Each duty holder has specific legal obligations, supported by HSE guidance, designed to ensure that risk is eliminated or reduced as early as possible.

Why CDM 2015 Focuses on the Start of the Project

One of the key objectives of CDM 2015 was to shift attention upstream, placing greater responsibility on those who influence decisions at the earliest stages of a project.

Design choices, procurement strategy, programme constraints and contractor selection all have a profound impact on:

• Construction risk
• Workforce well-being
• Asset maintainability
• Long‑term operational safety

Well‑planned projects with clear leadership and adequate resourcing consistently deliver safer outcomes, fewer disruptions and better value over the full lifecycle of the asset.

CDM 2015: What Clients, Suppliers and Partners Need to Know

This guide provides a clear, practical overview of the Construction (Design and Management) Regulations 2015 (CDM 2015) and the responsibilities they place on clients and the wider project team. It explains why early planning, competent appointments and effective collaboration are critical to delivering safe, compliant construction projects.

With over 190 prosecutions and more than £16 million in fines issued under CDM 2015 to date—including individual penalties of up to £900,000—the consequences of non‑compliance are significant. This document is designed to help clients, suppliers and partners understand their duties, reduce risk, and support safer project delivery from concept through to completion.

Download CDM Regulations 2015: A Clients Duty 2026 PDF

Client Duties Under CDM 2015

The client role is pivotal. Clients set the tone, priorities and constraints within which all other duty holders operate.

Under CDM 2015, clients must ensure that:

Pre‑Construction Responsibilities

• Suitable arrangements are in place to manage health and safety
• A Principal Designer is appointed in writing where more than one contractor is involved
• Designers and contractors are competent and appropriately resourced
• Pre‑construction information is prepared and shared
• Sufficient time and budget are allowed for safe delivery
• Notifiable projects are reported to the HSE

During Construction

• Duty holders cooperate and coordinate effectively
• A suitable Construction Phase Plan is in place before work starts
• Welfare facilities are provided and maintained
• The Principal Designer and Principal Contractor are fulfilling their roles

Post‑Construction

• A compliant Health and Safety File is received, retained and made available for future works

Failure to meet these duties cannot be delegated away and remains a legal responsibility of the client.

CDM Enforcement and Legal Consequences

Despite CDM 2015 being in force for over ten years, HSE investigations continue to highlight repeated failures in client leadership and early planning.

Key enforcement realities include:

• Over 190 CDM 2015 prosecutions since the regulations came into force
• More than £16 million in total fines, with penalties increasing year on year
• Individual fines reaching £900,000 in serious cases
• A growing number of prosecutions involving clients and senior decision‑makers, not only principal contractors

The HSE also operates the Fee for Intervention (FFI) scheme. Where a material breach of health and safety law is identified, organisations can be charged for the cost of HSE intervention, currently £188 per hour. These costs apply regardless of whether a prosecution follows and can escalate quickly on complex projects.

Who Is a Client Under CDM?

A client is any organisation or individual for whom construction work is carried out.

This includes:

• Commercial developers and asset owners
• Public sector bodies and utilities
• Infrastructure operators
• Domestic clients (with modified duties)

Construction work under CDM covers a wide scope, including electrical, mechanical and fixed services installation, commissioning, maintenance and removal.

Working Together to Deliver Safer Projects

Effective CDM compliance is strongest where clients, designers, contractors and suppliers work collaboratively from the outset.

By treating health and safety as an integral part of project planning—rather than a compliance exercise—organisations can:

• Reduce incidents and disruption
• Improve buildability and efficiency
• Protect reputations and commercial outcomes
• Create safer environments for everyone involved

For clients, suppliers and partners alike, understanding and fulfilling CDM responsibilities is not optional. It is a legal requirement and a critical component of sustainable project delivery.