CISR12030 | The Scheme: contractors: businesses and individuals that are NOT contractors
From HM Revenue & Customs · Construction Industry Scheme Reform Manual
Under the Scheme, the following businesses and individuals are NOT contractors:
Businesses or other concerns outside the mainstream construction industry whose average annual expenditure on construction work over the last rolling 12 month period does not exceed £3 million (See CISR12050 for more information about this).
Householders that are having work done on their own homes, such as new house building, decoration, repairs or an extension.