# The Building Regulations 2010, Regulation 11U: Principal designer and principal contractor: Wales


(1) Where there is more than one contractor, or it is reasonably foreseeable that more than one contractor will be working on a project, the client must appoint in writing—
(a) a designer with control over the design work as the principal designer for the purposes of these Regulations, and
(b) a contractor with control over the building work as the principal contractor for the purposes of these Regulations.
(2) A client is treated as complying with the requirement in paragraph (1) if, instead of appointing a person for the purposes of these Regulations, they certify, in writing, that the person who is the CDM principal designer, or, as the case may be, the CDM principal contractor, is treated as appointed as the principal designer or, as the case may be, the principal contractor, for the purposes of these Regulations.
(3) The appointments under this regulation must be made—
(a) in relation to a project which includes higher-risk building work for which an application for building control approval must be submitted to the building control authority, before that application is submitted;
(b) in relation to any other project, before the construction phase begins.
(4) Where the appointment of a principal designer or the principal contractor ends before the end of the project, as soon as reasonably practicable the client must appoint a new principal designer or new principal contractor under this regulation.
(5) Where the client fails to appoint a principal designer (or a replacement principal designer) or, a principal contractor (or a replacement principal contractor), the client must fulfil the duties of the principal designer or the principal contractor, under these Regulations until they appoint another person to that role.
(6) Where there is only one contractor working on a project that contractor is to be treated as appointed as the principal contractor and must fulfil the duties of the principal contractor set out in these Regulations.
(7) Where paragraph (6) applies and—
(a) there is only one designer, or it is reasonably foreseeable that there will be only one designer working on a project, that designer must fulfil the duties of the principal designer set out in these Regulations, or
(b) there is more than one designer or it is reasonably foreseeable that there will be more than one designer working on a project at any time—
(i) the designers must agree in writing which designer is to fulfil the duties of the principal designer set out in these Regulations (“the lead designer”);
(ii) the principal designer must give a copy of the agreement to the client.
(8) In relation to higher-risk building work, on appointing a principal designer, for each appointment the client must keep a record, in writing, of the steps it took under paragraph (2) to (4) of regulation 11V (considerations before a person carries out work: Wales).
(9) In relation to higher-risk building work, on appointing a principal contractor, for each appointment the client must keep a record, in writing, of the steps it took under paragraphs (2), (3) and (5) of regulation 11V (considerations before a person carries out work: Wales).
(10) In relation to higher-risk building work, on appointing any other person, the person making the appointment must give to the client (and the client must keep) a record, in writing, of the steps the person making the appointment took under regulation 11V(2) (considerations before a person carries out work: Wales).
(11) In this regulation—
“CDM principal contractor” means a contractor appointed as principal contractor under the CDM Regulations;
“CDM principal designer” means a designer appointed as principal designer under the CDM Regulations;
“the CDM Regulations” means the Construction (Design and Management) Regulations 2015.

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Source: https://www.legislation.gov.uk/uksi/2010/2214/regulation/11U (the official version)
Page: https://openlegislation.uk/building-regulations-2010/regulation-11U
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.