How to Write a Construction Phase Plan That Passes Every Audit

The construction phase plan is one of the most important documents on any project, yet it's also one of the most frequently botched. Auditors see the same problems again and again: plans that are copied wholesale from the last job, plans that were written before work started and never updated, and plans that read like a risk assessment rather than a management document.

Under CDM 2015, work cannot legally begin until a construction phase plan is in place. Getting it right from the start saves time, protects your workforce, and keeps you on the right side of the HSE.

What Is a Construction Phase Plan?

The construction phase plan (CPP) is a document required under Regulation 12 of the Construction (Design and Management) Regulations 2015. It sets out how health and safety will be managed during the construction phase of a project.

It's not a risk assessment. It's not a method statement. It's the overarching management document that explains how the project will be run safely — who's responsible for what, what the site rules are, how emergencies will be handled, and how health and safety performance will be monitored.

For single-contractor projects, the contractor must ensure the plan is drawn up before work begins. For multi-contractor projects, this duty falls to the principal contractor.

Who Is Responsible?

On projects with more than one contractor, the principal contractor is responsible for preparing, developing, and maintaining the construction phase plan. They must do so in consultation with the principal designer and, where necessary, other contractors.

On single-contractor projects, the lone contractor takes on this responsibility.

The client has a duty to ensure that a construction phase plan is in place before the construction phase begins. This means the client should be asking for evidence of the plan — not just assuming it exists.

What Must Be Included

The HSE doesn't prescribe a rigid template, but Regulation 12(2) sets out the minimum content. A compliant plan should cover the following areas.

Project Description and Arrangements

• A description of the project, including key dates and phases
• The management structure — who holds each duty holder role, and how they'll communicate
• Arrangements for cooperation and coordination between contractors
• How the principal contractor will consult with workers and their representatives

Site Rules and Procedures

• Site induction requirements and content
• Rules for access, egress, and movement of vehicles
• Procedures for delivery and storage of materials
• Rules on personal protective equipment (PPE)
• Arrangements for controlling access to the site by unauthorised persons
• Housekeeping standards and waste management procedures

Health and Safety Arrangements

• Arrangements for monitoring health and safety performance on site
• How RAMS (risk assessments and method statements) will be managed, reviewed, and communicated
• Procedures for reporting and investigating accidents and incidents
• Arrangements for health surveillance where required (e.g., noise exposure, vibration, dust)

Fire and Emergency Procedures

• Emergency procedures including fire, structural collapse, chemical spill, and medical emergencies
• Location and type of firefighting equipment
• Means of raising the alarm
• Assembly points and evacuation routes
• Names and roles of emergency coordinators
• Arrangements for liaising with emergency services

Welfare Arrangements

• Location and provision of welfare facilities: toilets, washing facilities, changing rooms, rest areas, drinking water
• Arrangements for first aid, including names of first aiders and location of first aid equipment
• Provisions for heating, lighting, and ventilation in enclosed work areas

Design and Risk Information

• A summary of key risks identified during the design process (provided by the principal designer)
• How residual design risks will be managed during construction
• Arrangements for dealing with unexpected risks or conditions discovered on site

Common Audit Failures

These are the issues that auditors flag most often — and the ones most likely to lead to enforcement action.

Generic content. If your plan reads like it could apply to any project, it's not project-specific enough. Auditors look for site addresses, named individuals, specific hazards relevant to this job, and references to actual site conditions. A CPP that mentions "working at height" without specifying the nature of the height work on this project is a red flag.

No evidence of review or update. A plan written in week one and never touched again fails the "living document" test. Auditors check version histories, review dates, and evidence that the plan has been updated as the project evolves — particularly when new trades arrive, the programme changes, or incidents occur.

Missing welfare details. It's surprisingly common for plans to omit or gloss over welfare arrangements. The HSE takes welfare seriously. If your plan doesn't specify where the toilets are, how they're maintained, and who's responsible, expect it to be raised.

No monitoring arrangements. Stating that health and safety will be "monitored" without explaining how — who carries out inspections, how often, what's recorded, how issues are escalated — is a consistent audit failure.

Unsigned or unacknowledged. There should be evidence that the plan has been communicated to all contractors on site and that they understand their obligations under it. Briefing records, induction sign-off sheets, and toolbox talk logs all support this.

Tips for Keeping It Current

A construction phase plan is only as good as its last review. Here's how to keep it relevant:

Schedule formal reviews. At minimum, review the plan monthly and at every significant phase change. Record each review with a date, reviewer name, and summary of changes.

Tie updates to site events. New contractor mobilising? Update the plan. Near-miss on site? Review the relevant section. Programme acceleration? Check your emergency and welfare provisions still hold.

Make it accessible. The plan should be available on site at all times — not buried in a filing cabinet in the head office. A digital copy that site managers can access on their phones is ideal.

Involve your supply chain. Subcontractors should contribute to the sections relevant to their work. This improves the quality of the plan and ensures they've actually read it.

Version control. Number your revisions and keep a change log. When an auditor asks to see the plan, they'll want to see evidence of its evolution — not just the latest version.

Getting Started

If you're starting from scratch, begin with the structure above and populate each section with project-specific content. Resist the temptation to paste in boilerplate from another project — auditors can tell, and more importantly, a generic plan doesn't protect anyone.

For principal contractors managing multiple projects, a standardised template with mandatory project-specific fields is a sensible approach. It gives you consistency without sacrificing relevance.

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The construction phase plan isn't a box-ticking exercise. Done properly, it's the document that ties together every other health and safety measure on site. Write it well, keep it current, and make sure everyone on site knows it exists. That's what passes audits — and, more importantly, what keeps people safe.