The Construction Phase Plan Explained: What CDM 2015 Really Asks For (2026)

Few pieces of paper cause as much quiet panic on a UK site as the construction phase plan. A client asks for one before you can start. A principal contractor mentions it in passing. An enquiry lands with a line that says please send your construction phase plan, and suddenly a job you were ready to price feels like it needs a compliance department. So people do one of two things. They ignore it and hope nobody checks, or they download a fifty page template, fill in the first few boxes, and file something that has almost nothing to do with the work in front of them.

Both of those are worse than the truth. The truth is that a construction phase plan is simpler than the fear around it suggests. It is a written record of how a job will be run safely, drawn up before work starts and kept up to date as the job changes. It is required for every construction project under CDM 2015, however small, but the law never asks for a huge generic document. It asks for a plan that fits the job.

We run DDC Scaffolding alongside building Complys, so this is not theory for us. We produce construction phase plans for real jobs, and we have seen how much easier they are when the supporting detail is already in order. This guide sets out what a construction phase plan is, who is responsible for it, when it must be ready and what it should contain, in language you can actually use on site.

What is a construction phase plan?

A construction phase plan is the overall health and safety plan for a construction project. It records the arrangements for managing the work, the site rules everyone must follow, and the specific measures needed to control the significant risks on that particular job. It is the document that answers a simple question. How is this project going to be built without hurting anyone?

The requirement comes from the Construction Design and Management Regulations 2015, usually shortened to CDM 2015. Under those regulations a construction phase plan must be drawn up for every construction project. There is no size threshold below which it stops applying. A single day of work replacing a shopfront needs one, and so does a year long commercial build. What changes between those two is not whether you need a plan but how much plan the job justifies.

It helps to be precise about what a construction phase plan is not. It is not a risk assessment for one task. It is not a method statement. It is not an induction, a permit or a toolbox talk. Those things sit underneath it and feed into it. The construction phase plan is the level above them, the plan for the project as a whole, the thing that says here is how the whole site will be organised and controlled while the work is going on.

What is a construction phase plan for, in practice?

On the ground the plan does three jobs. First, it forces whoever is running the work to think through the risks before anyone turns up, rather than discovering them halfway through. Second, it gives everyone on site a shared reference for how things are done here, from where the welfare is to who controls access to a scaffold. Third, it gives clients, principal contractors and inspectors something to look at that shows the job is being managed rather than improvised.

That third point is where a lot of the demand comes from. Good clients will not let you on site without one. Principal contractors need to see that their subcontractors understand the site arrangements. And if the Health and Safety Executive visits, the construction phase plan is one of the first things they will ask to see, because it tells them at a glance whether the project has been planned or thrown together.

Who is responsible for the construction phase plan?

Responsibility depends on how many contractors are working on the project, and this is where a lot of the confusion sits, so it is worth being exact.

If a project involves more than one contractor, the client must appoint a principal contractor, and the principal contractor prepares the construction phase plan. On that kind of project the principal contractor is the organisation in overall charge of managing the construction work, and drawing up and maintaining the plan is one of their core duties. Every other contractor on site works within that plan and follows its site rules.

If a project involves only one contractor, there is no principal contractor, and the contractor themselves prepares the construction phase plan. This catches a huge number of small jobs. A single trade doing a single package of work on a domestic or commercial property is still a construction project under CDM 2015, and that contractor is responsible for the plan. Being small does not remove the duty. It only changes the scale of what is proportionate.

The client has a part to play too. Clients must make sure a construction phase plan is drawn up before the construction phase begins, and they must provide the pre-construction information that the plan is built on. So even when the client is not writing the plan themselves, they cannot simply hand the whole thing off and forget it. They have to check that it exists and that they have supplied what the plan needs.

When must the construction phase plan be ready?

The timing rule is short and it is not negotiable. The construction phase plan must be drawn up before the construction phase begins. Not on the first day. Not once the scaffold is up and someone remembers. Before work starts.

The reason is obvious once you say it out loud. The whole point of the plan is to work out how the job will be done safely before anyone is exposed to the risk. A plan written after the fact is not a plan, it is a record, and it has already failed the people it was supposed to protect. So the sequence on any job is that the pre-construction information comes together, the plan is drawn up from it, and only then does work begin on site.

This is also why the plan cannot be a one off event. It is drawn up before the start, but it does not stop there. As the job changes, the plan changes with it. We will come back to that, because treating the plan as a living document is one of the things that separates a real construction phase plan from a filed form.

How the plan fits with pre-construction information, RAMS, inductions and site rules

The construction phase plan does not exist on its own. It sits in a chain of documents, and understanding where it sits is the fastest way to stop feeling overwhelmed by all of them.

At the front of the chain is the pre-construction information. This is what the client and the design team know about the project before work starts, the things that affect health and safety, such as the nature of the structure, known hazards like asbestos or overhead cables, and constraints of the site and its surroundings. The construction phase plan takes account of that pre-construction information. In other words, the plan is the answer to the questions the pre-construction information raises. You cannot write a good plan without it, which is exactly why the client has a duty to provide it.

Underneath the plan sit the RAMS. RAMS stands for risk assessment and method statement, and here is the distinction that clears up most of the muddle. A construction phase plan is the overall plan for the whole project. A RAMS covers how one specific task is done safely. The construction phase plan for a refurbishment might refer to a scaffold being erected, and the RAMS is the document that says exactly how that scaffold is put up, by whom, with what controls. One is the map of the whole job. The others are the step by step routes for each individual piece of work.

The plan also connects to what happens the moment someone arrives on site. Site inductions brief every worker on the arrangements and site rules the plan sets out. Site rules are the everyday requirements the plan establishes, from sign in procedures to exclusion zones to how deliveries are managed. Inductions are how those rules reach the people who have to follow them, and the check in register is how you know who has actually been briefed and is on site on a given day. All of it hangs off the plan, and all of it is the evidence that the plan is being lived rather than just written.

What a construction phase plan should contain

There is no single legally mandated template, which is part of why people find the plan hard to pin down. What CDM 2015 expects is that the plan sets out the health and safety arrangements, the site rules and the specific measures for the work, taking account of the pre-construction information. In practice a sound construction phase plan covers a recognisable set of things.

• A description of the project, including key dates, the client, and the contractors or trades involved.
• The management arrangements, covering who is responsible for what, how the work is supervised and how health and safety is monitored on site.
• The site rules that everyone must follow, and how they are communicated through induction.
• The arrangements for controlling the significant risks on this job, such as work at height, excavations, services, lifting, and any hazards flagged in the pre-construction information.
• Welfare arrangements, so there is drinking water, toilets, washing facilities and somewhere to rest, appropriate to the job.
• How emergencies are handled, including first aid, fire and the procedure for getting help to site.

The measures for controlling significant risks are where the plan earns its keep, because this is where it links out to the RAMS for the individual tasks. The plan does not need to reproduce every method statement inside itself. It needs to identify the significant risks and point to how each is controlled, with the detailed RAMS held alongside it. That connection between the plan and the supporting documents is the difference between a plan that means something and a plan that is just a cover sheet.

If you have ever searched for a construction phase plan example or a construction phase plan template to see what good looks like, this is the shape you are looking for. A template is a useful starting point and there is nothing wrong with using one. The trap is treating the template as the finished article. A CDM construction phase plan is only worth anything once it has been made specific to your job, your risks and your site.

Proportionality: a small job needs a small plan

This is the point that gets lost most often, and it is the one that saves people the most grief once they understand it. The construction phase plan must be proportionate to the size and risk of the job. A small, low risk project needs a short, relevant plan. It does not need a hundred page generic document that says nothing about the actual work.

In fact a bloated generic plan is arguably worse than a short specific one. Nobody reads it, the real risks get buried in boilerplate, and when an inspector or client opens it they can see immediately that it was not written for this job. A two page plan that names the real hazards on this site and says clearly how they are controlled does more for safety, and stands up better to scrutiny, than fifty pages of copied text.

So if you are a single contractor doing a modest job and you have been putting off the plan because you pictured a huge document, let that go. What is being asked of you is a clear, honest, short account of how this particular job will be done safely, built on the pre-construction information you have been given. That is achievable in an afternoon once the supporting detail is in order, and it is far more use to everyone involved.

A living document, not a form to file

Perhaps the most important thing to understand about a construction phase plan is that it is a living document. It is drawn up before work starts, but it is meant to be kept up to date as the job changes, not filled in once and forgotten in a folder.

Jobs change. A new trade comes on site. A risk that was not obvious at the start reveals itself. The programme shifts, the sequence of work changes, or the client varies the scope. Every one of those changes can affect how the work is managed safely, and the plan is supposed to move with them. A construction phase plan that still describes the job as it was imagined three months ago, when the job on site has moved on, is not doing its job.

This is where the supporting arrangements matter most. If your RAMS, your inductions, your site rules and your records of who is on site are scattered across emails, phones and filing cabinets, keeping the plan current is a chore that quietly gets dropped. If those pieces are together and easy to reach, updating the plan becomes a small, routine act rather than a project in itself. That is the practical reason to keep everything in one place, and it is the problem we set out to solve.

How Complys helps you keep the supporting arrangements in one place

Complys does not write your construction phase plan for you, and we would not trust any tool that claimed to. The plan has to reflect your job, your risks and your judgement. What Complys does is help you assemble and hold the pieces the plan relies on, so that writing it and keeping it current is far less painful.

On a Complys project you keep the trades, the RAMS, the site-specific inductions, the site check-in register and the work reports together in one place. That is exactly the supporting detail a construction phase plan refers to. When the plan says the significant risks are controlled through the following method statements, those RAMS are already sitting alongside it rather than in someone's inbox. When it sets out site rules and says every worker is inducted, the induction records and the check in register are right there to prove it.

That matters most at the two moments when a plan is really tested. The first is when the job changes and the plan needs updating, which is far quicker when everything it refers to is in one place. The second is when someone asks to see it. An inspector or a client may ask not just for the plan but for the detail behind it, the RAMS, the evidence people were inducted, the record of who was on site and what work was done. Having all of that together, tied to the same project, is the difference between a confident answer and a scramble.

So the honest description is this. Complys helps you gather and keep the supporting arrangements a construction phase plan depends on, in one place, up to date, and ready to show. The plan is still yours to write. We just make sure the raw material for it is never scattered.

Bringing it together

A construction phase plan is not the bureaucratic monster it is often made out to be. It is the overall health and safety plan for a project, required for every job under CDM 2015, drawn up before work starts by the principal contractor on multi contractor jobs or by the contractor on single contractor jobs. It sets out the arrangements, the site rules and the specific measures for the work, built on the pre-construction information, with the RAMS for individual tasks held underneath it. It should be proportionate to the job and kept alive as the job changes. Understand those points and the fear falls away.

The part that trips people up is rarely the plan itself. It is keeping hold of everything the plan leans on while the job is moving. That is the part we built Complys to make easy. Keep your trades, RAMS, inductions, check-ins and work reports together, and both writing the plan and proving it becomes routine. You can start free and set up your first project in minutes, then see how much simpler the whole thing feels when the supporting detail is finally in one place.