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Waste Responsibility Under CDM 2015: Who Is in Charge When a Homeowner’s Renovation Involves More Than One Contractor
CDM 2015 defines a domestic client as anyone having construction work done on their own home, or a family member’s home, outside of a business, and shifts that client’s legal duties under the regulations to the contractor or principal contractor instead of the homeowner.
In this guide
The Health and Safety Executive confirms that under CDM 2015, a domestic client’s duties normally pass to the contractor on a single-contractor project, or to the principal contractor, or the contractor in control of the construction work, on a project involving more than one contractor.
What counts as a domestic client
HSE defines a domestic client as any individual who has construction work carried out on their home, or the home of a family member, that is not done as part of any business. A homeowner commissioning a larger renovation, an extension, a loft conversion, or similar work involving several trades, falls within this definition in the same way as someone booking a single, smaller job, provided the work is not connected to a business the homeowner runs.
Where the duties actually go
CDM 2015 imposes a set of legal duties on clients generally, covering matters such as managing health and safety risk on a project. For a domestic client specifically, HSE confirms these duties do not stay with the homeowner by default; instead, they normally pass to whoever is actually running the work. On a project with a single contractor, that contractor takes on the client’s legal duties in addition to their own as contractor. On a project involving more than one contractor, the principal contractor takes on these duties, or, where no principal contractor has been formally appointed, the contractor in control of the construction work at the time does instead.
The designer alternative
HSE also describes an alternative route on a multi-contractor project: where a domestic client has appointed a designer, such as an architect, that designer can instead take on the role of principal designer and accept the client duties, but only through a written agreement specifically confirming this arrangement. Without that written agreement, the default position, duties passing to the principal contractor or the contractor in control of the work, applies instead.
Why this matters with more than one trade on site
A renovation involving several separate trades, for example a structural contractor, an electrician and a plumber working at different stages, is exactly the kind of multi-contractor project where identifying who holds the principal contractor role matters, because that is the party CDM 2015 makes responsible for coordinating health and safety, and by extension the client’s wider duties, across the whole project rather than each trade managing its own patch in isolation. A homeowner who has not clearly agreed who is acting as principal contractor risks a gap where no one has formally taken on this coordinating role, even though the regulations intend for someone to hold it.
What this means in practice
Because the domestic client’s duties are designed to sit with the contractor or principal contractor rather than the homeowner, a homeowner does not need to personally manage the regulatory side of running a construction site, including the broader health and safety coordination CDM 2015 requires, provided the project is properly set up with someone clearly holding the principal contractor role. This is different from a commercial client, who keeps the full set of client duties directly rather than having them pass on by default.
Checking who is holding the duties
Before work starts on a renovation involving more than one contractor, confirming in writing who is acting as principal contractor, or whether a designer has agreed in writing to take on the principal designer role instead, avoids ambiguity about who is actually responsible for coordinating the project once several trades are involved. This is worth establishing alongside the practical planning covered elsewhere on this site for organising a larger renovation, such as booking skips and waste collection around the different stages of work.
FAQs
Does a homeowner personally hold CDM 2015’s client duties?
Not by default. HSE confirms a domestic client’s duties normally pass to the contractor, or to the principal contractor on a multi-contractor project.
What happens if no principal contractor has been appointed?
HSE says the duties pass instead to the contractor in control of the construction work at the time.
Can a designer take on these duties instead?
Yes, where the domestic client has appointed a designer who agrees in writing to act as principal designer and accept the client duties.
Is a domestic client treated the same as a business commissioning work?
No. A commercial client keeps the full client duties directly, while a domestic client’s duties pass on to the contractor or principal contractor by default.
Bottom line
Under CDM 2015, a homeowner having renovation work done as a domestic client does not usually hold the regulations’ client duties directly; they pass by default to the contractor on a single-contractor job, or to the principal contractor, or the contractor in control of the work, once more than one contractor is involved, unless a designer has agreed in writing to take on the principal designer role instead. Confirming who holds this role in writing before work starts avoids ambiguity on a larger, multi-trade renovation. This is general information, not legal advice on a specific project; HSE’s published guidance sets out the full detail of each role’s duties.
Sources
This guide draws on the following primary sources, current as of 22 September 2026:
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