CDM 2015 Contractor Duties: What You Need to Do to Keep Your Site Safe

Published 2026-05-30

As a contractor under CDM 2015, you have a non-negotiable legal duty to plan, manage, and monitor all construction work under your control, making sure it is carried out safely and without risks to health.

Your Foundation: Core CDM 2015 Contractor Duties

If you carry out, manage, or control construction work, then CDM 2015 defines you as a contractor. This isn't just about big construction firms, it includes sole traders, plumbers, electricians, roofers, and anyone else doing construction work. Your primary responsibility is to ensure that any work you undertake, or that is under your control, is done safely. This means actively planning, managing, and monitoring the work from start to finish. It is not enough to simply react to problems, you need to be proactive in identifying and controlling risks.

A crucial part of your duty is to cooperate. You must work closely with other duty holders involved in the project, which includes the client, the principal designer, and the principal contractor. This cooperation ensures that everyone is on the same page regarding health and safety, sharing vital information and coordinating activities to prevent accidents and ill health. You also need to make sure that anyone working for you, or under your control, is competent to do the job safely. This means they should have the right skills, knowledge, training, and experience. If they don't, it is your duty to provide it. Furthermore, you are responsible for providing appropriate welfare facilities for your workers, ensuring they have access to things like toilets, washing facilities, and a place to rest and eat. These duties are not optional, they are legal requirements designed to protect everyone on a construction site. Ignoring them can lead to serious accidents, enforcement action, and significant penalties.

Making it Happen: Competence, Resources, and the Construction Phase Plan

To genuinely meet your CDM 2015 duties, you need to ensure two things are firmly in place: competence and adequate resources. Competence isn't just about having qualifications, it is about demonstrating that you, and everyone working for you, have the right mix of skills, knowledge, experience, and training to carry out their tasks safely. This applies to everyone, from the person digging a trench to the project manager overseeing the entire job. You need to assess the competence of your workforce and, if there are gaps, provide the necessary training or supervision to bridge them. Remember, relying on someone else's word isn't enough, you need to have a system in place to verify competence.

Alongside competence, you must ensure you have sufficient resources. This means having enough time, money, materials, and equipment to do the job properly and safely. Cutting corners on resources often leads to increased risks. For example, rushing a job due to tight deadlines can lead to mistakes and accidents, while using unsuitable or poorly maintained equipment can be dangerous. It is your responsibility to allocate these resources effectively to manage health and safety throughout the project.

Your Role with the Construction Phase Plan (CPP)

The Construction Phase Plan (CPP) is a vital document outlining how health and safety will be managed during the construction phase. Your involvement with the CPP depends on the project:

Having a robust CPP, and understanding your place within it, is fundamental to managing risks effectively on any construction site.

On the Ground: Managing Risks and Ensuring Site Safety

Once you have your plans and competent people in place, the real work of managing risks on site begins. This is where your duties translate into practical actions every single day. Risk assessment is at the heart of this. Before any work starts, you need to identify what could cause harm (the hazards), who might be harmed and how (the risks), and what you are going to do to prevent that harm (the control measures). This isn't a one-off exercise, it is an ongoing process. As circumstances change on site, or new tasks begin, you need to revisit your risk assessments.

Following on from risk assessments, method statements are your detailed instructions for how specific tasks will be carried out safely. These should clearly outline the sequence of work, the equipment to be used, the precautions to be taken, and the responsibilities of the workers involved. Everyone undertaking the task must understand and follow the method statement.

Key Site Safety Practices

Beyond risk assessments and method statements, several other practices are crucial for maintaining a safe site:

By actively implementing these measures, you create a robust safety culture and significantly reduce the likelihood of incidents on your construction site.

Teamwork Makes the Dream Work: Communication and Collaboration

Construction projects are rarely solitary endeavours. Most involve multiple parties, and CDM 2015 places a significant emphasis on communication and collaboration between all duty holders. As a contractor, you are a vital link in this chain. Effective communication ensures that everyone has the information they need to do their job safely and prevents misunderstandings that could lead to accidents.

Your duty to cooperate extends to every other party involved in the project:

Reporting and Feedback

Beyond day-to-day coordination, you have a duty to report any health and safety incidents, dangerous occurrences, or near misses to the principal contractor without delay. This