# The Building Regulations 2000, Regulation 3: Meaning of building work


(1) In these Regulations “building work” means—
(a) the erection or extension of a building;
(b) the provision or extension of a controlled service or fitting in or in connection with a building;
(c) the material alteration of a building, or a controlled service or fitting, as mentioned in paragraph (2);
(d) work required by regulation 6 (requirements relating to material change of use);
(e) the insertion of insulating material into the cavity wall of a building;
(f) work involving the underpinning of a building.
(2) An alteration is material for the purposes of these Regulations if the work, or any part of it, would at any stage result—
(a) in a building or controlled service or fitting not complying with a relevant requirement where previously it did; or
(b) in a building or controlled service or fitting which before the work commenced did not comply with a relevant requirement, being more unsatisfactory in relation to such a requirement.
(3) In paragraph (2) “relevant requirement” means any of the following applicable requirements of Schedule 1, namely—
Part A (structure)
paragraph B1 (means of warning and escape)
paragraph B3 (internal fire spread—structure)
paragraph B4 (external fire spread)
paragraph B5 (access and facilities for the fire service)
Part M (access and facilities for disabled people).

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Source: https://www.legislation.gov.uk/uksi/2000/2531/regulation/3 (the official version)
Page: https://openlegislation.uk/building-regulations-2000/regulation-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.