Certificate of existing lawful development for the caravan, as a means of its permanence, physical attachment to the ground, and that all paraphernalia existed was constructed on site, would constitute the definition of a ‘building’ as held under Section 336(1) of the Town and Country Planning Act of 1990, and ‘operational development’ held within Section 55(1) to the 1990 Act. Where the above is established, the caravan has remained as a building on site for more than 4 years and is considered lawful in use as a residential dwelling.