# The Building Regulations (Northern Ireland) 2012, Regulation 43: Renovation of thermal elements

Extent: N.I.

(1) Where the renovation of an individual thermal element—
(a) constitutes a major renovation; or
(b) amounts to the renovation of more than 50% of the surface area of the thermal element,
the renovation shall be carried out so as to ensure that the whole of the thermal element complies with the requirement of regulation 39(a)(i) in so far that it is technically, functionally and economically feasible.
(2) Where the whole or any part of an individual thermal element is to be replaced and such work—
(a) constitutes a major renovation; or
(b) in the case of part replacement, amounts to the renovation of more than 50% of the surface area of the thermal element,
the whole of the thermal element shall be replaced to comply with the requirement of regulation 39(a)(i) in so far that it is technically, functionally and economically feasible.

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Source: https://www.legislation.gov.uk/nisr/2012/192/regulation/43 (the official version)
Page: https://openlegislation.uk/building-regulations-northern-ireland-2012/regulation-43
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.