A dwelling or conversion is defined as ‘started’ when work commences and the requirements of the building regulations apply (e.g., excavation of foundations, drainage, structural alterations).
Gwaith Mae'n cyfeirio at brosiectau adeiladu neu beirianneg sifil, gan gynnwys tasgau megis datblygu seilwaith, atgyweirio, adnewyddu, a gosodiadau.