This Practice Note looks at the practice, in construction contracts, of employers retaining an agreed percentage from interim payments due to a contractor or sub-contractor as security for the future performance of its obligations under the building contract/sub-contract (known as ‘retention’ or ‘retentions’). It looks at the amount usually retained, the treatment of retention money, its release and retentions under standard form building contracts. It also considers the use of retention bonds and highlights the government plan to prohibit retention practices in construction contracts. The concept of a retention from interim payments is commonplace in commercial construction contracts, particularly standard form ones. This familiar landscape is due to change imminently now that the UK government has introduced the Commercial Contracts Bill which will, once in force, prohibit the use of retention clauses in construction contracts. See, below, ‘Change ahead: Change ahead: UK government proposals to outlaw retention What is retention? Retention is the name given to the money the employer retains from interim payments as security for the future performance of the contractor’s obligations