Note that these provisions apply only to expenditure incurred before 6 April 2015.
Finance Act 2004 introduced ICTA 1988, s. 31A and 31B, which applied to capital expenditure laid out for the provision of certain energy-saving items in a residential dwelling-house, on or after 6 April 2004 but before 6 April 2009. The end date was extended from 2009 to 5 April 2015 by Finance Act 2007.
The relief is known as the ‘landlords’ energy saving allowance’ (LESA). It operates by allowing the landlord to deduct the capital expenditure in calculating the profits of the property business, effectively as if it were a revenue expense.