Client, designer and contractor dutyholder responsibilities

Duty holders

The new duty holders introduced under the Building Regulations etc. (Amendment) (England) Regulations 2023 are: 

  • client - a person for whom the project is carried out,
  • domestic client - a person for whom the project is carried out but not for the furtherance of a clients business,
  • principal designer - usually the lead designer,
  • principal contractor - usually the lead contractor.

There are also new duties placed on designers (including sole or lead designers) and contractors (including sole contractors). These roles are effective from 1 October 2023, The aim is to ensure that at each stage in a building project, duty holders are identified, and the roles, responsibilities and expectations are clear.

Duty holders must ensure they possess the necessary skills, knowledge, experience, and behaviour to carry out their design and construction work. They must also stay within the limits of their competence. Additionally, the client must take reasonable steps to confirm that the dutyholders they appoint are competent, and duty holders themselves must decline appointments for work they aren't competent to handle. Duty holders are required to collaborate with other dutyholders, coordinate their work, and share information with each other. It is possible for a dutyholder to hold more than one duty-holding role, as long as they are competent to do so.

Client means any person for whom a project is carried out project means a project which includes or is intended to include any building work and includes all planning work, design work, management or other work involved in a project until the end of the construction phase.

The client’s duties cannot be subcontracted to a third party. Where there is more than one client, one person must be named as the client for the project,

The client must: 

  • make sure they make suitable arrangements for planning, managing and monitoring the project to ensure it complies with the building regulations, during design, construction and for the lifetime of the project.
  • make sure they appoint a competent principal designer and principal contractor for the work and sign a declaration that they have done so.
  • the council will require the names, phone numbers, addresses, and email addresses of the principal designer and the principal contractor. (Provision for this is on the application form.)
  • advise building control of the start date of the work, and date and description of ‘commencement’. This information is required at the application stage.
  • give notice to Kingston council if there is a change of client after a building control approval application is made or a building notice is given.
  • the client has overall control over the project and, therefore, they are ultimately responsible for the provision of information to others involved in the project. For HRBs this is known as The Golden Thread - both the information that allows you to understand a building and the steps needed to keep both the building and people safe, now and in the future - but it is important to keep an information trail for all building work.
  • if any of the designers or contractors change, then there should be a handover of information. The new person in charge then notifies the relevant authority, explaining that they're doing work on behalf of the domestic client. Whilst the client can ask others to do certain tasks, they can't pass on the overall responsibility, and they have to make sure the people they choose are qualified for the job.

Domestic client means a client for whom a project is being carried out which is not in the course or furtherance of a business of that client:

  • when it comes to home projects, the client usually won't have enough expertise to handle all of the key client responsibilities. So, most of the duties related to the project's safety and compliance will fall on those doing the design and construction work.
  • where there is more than one person working on different aspects of the project, a domestic client should appoint a principal designer to be in control of design work and a principal contractor to be in control of the building work.
  • if a domestic client does not appoint either a principal designer or principal contractor, then the designer in control of the design phase of the project is the principal designer and the contractor in control of the construction phase of the project is the principal contractor.
  • on minor projects, where there is no designer, the principal contractor may take the role of both PD & PC
  • the domestic client must provide building information that they have, or it would be reasonable for them to obtain, to the designers and contractors working on the project.
  • they must cooperate with anyone working on or in relation to the project to the extent necessary to enable them to comply with their duties or functions

Principal designer is a designer who is an organisation or individual (on smaller projects) appointed by the client to take control of the pre-construction phase of any project involving more than one contractor.

A principal designer must be appointed in writing before the construction phase begins, or for building control approval for a higher-risk building, before submitting an application.

You must:

  • plan, manage and monitor the design work during the design phase.
  • take all reasonable steps to ensure the design work carried out by them and anyone under their control is planned, managed and monitored so that the design is such that, if built, it would comply with all relevant requirements of the building regulations.
  • make sure that they, and all those working on the project, cooperate, communicate and coordinate their work with the client, the principal contractor, and other designers and contractors.
  • liaise with the principal contractor and share information relevant to the building work.
  • assist the client in providing information to designers.
  • review the arrangements of any previous principal designer.
  • notify building control in writing, where applicable, that the work is being carried out on behalf of a domestic client.
  • ehere applicable, sign the declarations as referred to above in the client's duties when work is complete.

Designer means any person who in the course of a business:

(a) carries out any design work, or
(b) arranges for, or instructs, any person under their control to do so; (including a client, contractor or other person referred to in Part 2A of the Regulations) 

You must:

  • plan, manage and monitor design work so that if the building work were carried out, it would comply with the building regulations.
  • cooperate with the client, designers, and contractors to the extent that if the building work were carried out, it would comply with the building regulations.
  • not start any design work unless you are satisfied that the client is aware of the duties owed by the client.
  • carry out design to ensure that if building work were carried out, the design it would comply with the building regulations.
  • provide sufficient information about the building's design, construction and maintenance to allow the client, other designers and contractors to comply with the building regulations.
  • consider any other design work and report any compliance concerns relating to the design compliance to the principal designers and client.
  • must advise the principal designer or the client whether any work they are designing is higher-risk building work

Principal contractor is usually the main contractor and is appointed under Regulation 11D (principal designer and principal contractor) to perform the duties of a principal contractor where there is more than one contractor.

You must:

  • plan, Manage and Monitor the building work during the construction phase.
  • coordinate matters relating to building work to ensure the building work complies with the building regulations.
  • make sure cooperation amongst all duty holders.
  • make sure all building work is coordinated so that it complies with the building regulations.
  • make sure contractors comply with their duties.
  • liaise with the principal designer as required.
  • have regard to comments from the principal designer concerning compliance with the building regulations.
  • assist the client in providing information to contractors.
  • review the arrangements of any previous principal contractor.
  • notify building control in writing, where applicable, that the work is being carried out on behalf of a domestic client.
  • sign the declarations as referred to above in the client's duties when work is complete.

The contractor is any person including a client, but not a domestic client, who carries out, manages or controls any building work

You must:

  • plan, manage and monitor design work so that if the building work were carried out, it would comply with the building regulations.
  • cooperate with the client, designers, and contractors to the extent that if the building work were carried out, it would comply with the building regulations.
  • not start any design work unless you are satisfied that the client is aware of the duties owed by the client.
  • carry out design to ensure that if building work were carried out, the design would comply with the building regulations.
  • provide sufficient information about the building's design, construction and maintenance to allow the client, other designers and contractors to comply with the building regulations.
  • consider any other design work and report any compliance concerns relating to the design compliance to the principal designers and client.
  • must advise the principal designer or the client whether any work they are designing is higher-risk building work.