http://www.legislation.gov.uk/ukpga/1990/8/section/56/enactedTown and Country Planning Act 1990Structure PlansCouncil policies and plansPlanning (town and country)Local development plansPlanning ApplicationsKing's Printer of Acts of Parliament2021-08-02 Part IIIControl over developmentMeaning of developmentTime when development begun 56 1 Subject to the following provisions of this section, for the purposes of this Act development of land shall be taken to be initiated— a if the development consists of the carrying out of operations, at the time when those operations are begun; b if the development consists of a change in use, at the time when the new use is instituted; c if the development consists both of the carrying out of operations and of a change in use, at the earlier of the times mentioned in paragraphs (a) and (b). 2 For the purposes of the provisions of this Part mentioned in subsection (3) development shall be taken to be begun on the earliest date on which any material operation comprised in the development begins to be carried out. 3 The provisions referred to in subsection (2) are sections 85(2), 86(6), 87(4), 91, 92 and 94. 4 In subsection (2) “material operation” means— a any work of construction in the course of the erection of a building; b the digging of a trench which is to contain the foundations, or part of the foundations, of a building; c the laying of any underground main or pipe to the foundations, or part of the foundations, of a building or to any such trench as is mentioned in paragraph (b); d any operation in the course of laying out or constructing a road or part of a road; e any change in the use of any land which constitutes material development. 5 In subsection (4)(e) “material development” means any development other than— a development for which planning permission is granted by a general development order for the time being in force and which is carried out so as to comply with any condition or limitation subject to which planning permission is so granted; b development falling within any of paragraphs 1, 2, 3 and 5 to 8 of Schedule 3 (as read with Part III of that Schedule); and c development of any class prescribed for the purposes of this subsection. 6 In subsection (5) “general development order” means a development order (within the meaning of section 59) made as a general order applicable (subject to such exceptions as may be specified in it) to all land in England and Wales.