The Liberal Democrat manifesto pledges to build at least 100,000 homes for Social Rent each year and ensure total housebuilding increases to 300,000 per year. The also propose to link the Stamp Duty to the energy rating of a property and to introduce a Stamp Duty surcharge on overseas residents purchasing second homes. Properties bought as second homes would also to be subject to allowing local authorities to increase council tax by up to 500%.
For the rental market the Lib Dems plan to introduce a Help to Rent scheme providing Government backed deposits for first-time renters under 30 and to promote longer tenancies of 3 years or more with an inflation-linked annual rent increase.
On climate change and renewables they plan to get the UK to zero net greenhouse gas emissions by 2045 and set up a new Department for Climate Change and Natural Resources. All new homes will be built to a zero carbon standard by 2021. They propose an increase in the Minimum Energy Efficiency Standards (MEES) and removal of the cost cap.
You can read the full manifesto here.