Regulation 41 Consequential improvements
Where it is proposed to execute building work in relation to any existing building with a total useful floor area greater than 1000 m2 and that work consists of or includes—
(a)
an extension;
(b)
the initial provision of any fixed building service; or
(c)
an increase in the capacity of any fixed building service,
consequential improvements to the existing building shall be carried out to ensure that the building complies with the requirements of regulation 39 so far as this is technically, functionally and economically feasible.