Under the new Permitted Development (PD) rules, which came into effect on 31 August 2020, you can extend by up to two extra storeys. This is good news for many homeowners, including those with tricky loft conversions who were not eligible under the old PD rules.
However, extending up requires significant structural planning and you’ll need to adhere to Building Regulations. These ensure your house is structurally sound and meets standards regarding fire safety, energy efficiency and accessibility, among other things.