Landlords can claim a special tax allowance of up to £1,500 per property for expenditure on energy-saving insulation. This includes loft, wall, floor or hot water system insulation installed in residential properties.
This is a one-off allowance for expenditure made before 6 April 2015. It cannot be claimed by those who are claiming rent a room relief or if there is commercial letting of furnished holiday accommodation.
See the details here: