CDM Compliance for Renovation and Refurbishment Projects

Yes, the Construction (Design and Management) Regulations 2015 apply to your refurbishment exactly as they apply to a new build. Strip out a shopfloor, reconfigure an office, convert an old mill into flats, and you are the client under CDM. Where more than one contractor is involved you must appoint a Principal Designer and a Principal Contractor in writing, and those duties start the day you begin planning, not the day the tools arrive on site.

Most people assume CDM is a new-build regime. It is not. Regulation 2 defines construction work to include alteration, renovation, maintenance and demolition, so a Victorian mill conversion off Chestergate and a single-floor office refit both sit inside the same rules. The paperwork scales with the risk. The legal duty does not switch off because the building is already standing.

Does CDM 2015 really apply to a refit?

It applies to every construction project, including domestic ones, from the smallest strip-out upward. The regulations came into force on 6 April 2015 and cover any client who has building work done in connection with a business. What changes between a small job and a large one is not whether CDM applies, but how many duty holders you have to appoint and what you have to write down.

The single test that catches most refurbishment clients out is the number of contractors. One contractor, and you still need a construction phase plan before work starts. More than one contractor, which is almost every refit once you have a main builder plus an electrician and a mechanical firm, and you are legally required to appoint a Principal Designer and a Principal Contractor, produce pre-construction information, and keep a health and safety file for the finished building. Get the appointments in writing early. A verbal understanding is not an appointment, and if the HSE asks, a nod on site is worth nothing.

Why is refurbishment more dangerous than a new build?

Because you cannot see what you are buying. A new build starts from a clean slate with known materials. A refurbishment starts inside a structure someone else built, often decades ago, with services, contamination and structural quirks hidden behind the finishes. That is where the compliance work earns its keep.

The first item on any pre-2000 building is asbestos. Under the Control of Asbestos Regulations 2012, a refurbishment and demolition survey (an R&D survey, done to the HSG264 standard) is required before any work that will disturb the fabric of a building constructed before the year 2000. That is not a management survey, which only covers material you can see and keeps it managed in place. An R&D survey is intrusive, and it has to be, because the asbestos that hurts people on a strip-out is the pipe lagging, the artex, the textured coating and the panel behind the plasterboard that nobody knew was there.

This matters more here than in most regions. The commercial stock across Stockport town centre and the wider Greater Manchester conurbation is overwhelmingly pre-2000: Victorian and Edwardian mills, interwar terraces, and 1960s to 1970s concrete framed offices. On that building stock, asbestos and unknown structure are close to a certainty, not a risk you might dodge.

We will not take the Principal Designer role on a pre-2000 building until an R&D survey is booked. Some consultants will start the design and chase the survey later. On this region's building stock that is a poor trade, and here is why we hold the line on it. Back in 2021 we inherited a mill conversion where the previous team had commissioned a management survey rather than an R&D survey to save a few hundred pounds. The lagging behind the boxing and the artex on two ceilings only surfaced when the strip-out began. The job stopped for three weeks while a licensed removal contractor was brought in, and the client paid twice: once for the emergency removal, and again for the programme delay. The survey would have been cheaper than a single day of that.

Do I have to notify the HSE about my project?

You notify the HSE on form F10 if the construction work is scheduled to last longer than 30 working days and have more than 20 workers on site at any one time, or if it will exceed 500 person days. Either threshold triggers it. A person day is simply one worker for one day, so 10 people for 50 days is 500 person days and notifiable, even if the headcount never tops 20.

Plenty of mid-sized refurbishments cross the line without the client realising. A six-week office fit-out with 25 trades on during the busy weeks is notifiable. So is a longer, thinner job that never looks busy but racks up the person days. The client gives notice in writing before the construction phase begins, or arranges for someone to do it for them, and the F10 has to be clearly displayed on site. Missing it is one of the easiest breaches for an inspector to spot, because the first thing they look for is the notice on the hoarding.

What does getting it wrong actually cost?

More than the compliance would have. If an HSE inspector finds you in material breach of health and safety law, you pay for their time to put it right under the Fee for Intervention scheme. From 1 April 2026 that rate is £188 per hour, and it covers the inspector's visit, the report, the follow-up and any investigation. A single serious finding on a live refurbishment routinely runs into four figures before any prosecution is even considered.

The prosecution is the part that ends careers. Breaches of CDM and the wider health and safety regime carry unlimited fines and, for the worst cases, custody. And if your refit touches a taller residential building, the Building Safety Act 2022 pulls anything over 18 metres or 7 storeys into the higher risk regime, with the Building Safety Regulator and its gateway approvals sitting across your programme. None of this is a reason to fear a refurbishment. It is a reason to appoint the right duty holders on day one and put the cost of doing it properly into your appraisal, not into your contingency.

Who does what under CDM on a refurbishment?

Here is how the duties fall on a typical multi-contractor refit, and what triggers each one.

What would we do first on a Stockport refurbishment?

Book the survey and get the appointments in writing before a designer draws a line. On a pre-2000 building the R&D asbestos survey drives the whole programme, because it decides what can come out, in what order, and by whom. In parallel we assemble the pre-construction information: the existing drawings if they survive, the structural assumptions, the live services, and the asbestos register. That pack is what a Principal Contractor prices against, and a thin pack produces a thin price and a fat variation later.

The honest tradeoff is that all of this front-loads cost and time onto a project before a single wall moves. You are paying to find problems you would rather not know about. We take that trade every time, because the same problem found after the contract is signed is no longer a design decision. It is a claim.

If you are planning a refit, a strip-out or a change of use anywhere across Stockport and Greater Manchester, our CDM advisor and health and safety team can take the Principal Designer role and set the compliance framework before you commit. We also fold it into wider project management and construction health and safety support, with independent quality assistance on site so the work that gets built matches the work that was specified. We have been reading this region's buildings since 1992. Talk to our team before you appoint a contractor, not after the strip-out finds the surprise.