42% admitted that their tenants would need to leave the properties during the improvement works, with 38% expecting their properties to be vacant for four weeks at a cost of £5k in rental income.

Meanwhile, 23% of landlords said their properties are currently rated D or below for energy efficiency so would face being unable to begin a new tenancy from 2025 unless improvements are made, should the proposed regulations be implemented.

However, 27% of landlords admitted to not knowing the energy efficiency rating of their property. In some cases, landlords said they only knew the current energy efficiency rating for some, not all of their rental properties.

Consequently, 25% of landlords don’t know if, or what, level of work will be needed for their properties to meet the minimum ‘C’ rating under current proposals.

The research found that, on average, landlords expect the improvements to cost £5,900, but only 31% currently have the necessary funds available to pay for the proposed changes.

Emma Cox, managing director of real estate at Shawbrook, said: “As a business, we welcome the proposed legislative changes and the opportunity this will provide landlords and members of the private rented sector to be at the forefront of the UK’s green revolution. However, there are many unanswered questions about the deadline and possible incentives to enable improvements to be made, so further clarity and education is needed to support landlords through the changes.

“While our research shows that one in 10 landlords are planning to put off starting any work for three to four years in the hope that this will bring further clarity, putting works off for too long could be detrimental financially. For landlords that don’t have access to the necessary funds to make improvements, brokers can play a key role in supporting them. There are cost effective funding options available, such as bridging finance, and brokers are well placed to help make landlords aware of these solutions.”