In light of concerns that it can constrain commercial rooftop solar projects, for what reason it requires permitted development for any sit…

Permitted development rights apply to solar photovoltaic panels on non-domestic properties in Scotland where the output does not exceed 50kW, subject to certain conditions. Installations with a greater output will need an application for planning permission, which is required to be determined in accordance with the development plan for the area unless material considerations indicate otherwise.
The Scottish Government consulted on changes to permitted development rights for non-domestic solar panels in 2015, including on proposals to increase the 50kW threshold. However, some comments received raised aviation safety concerns and consequently such a change was not progressed at that time.
Since then, responses to our consultation on Places, People and Planning have confirmed support for expanding permitted development rights across a wide range of development types, and we have commissioned a sustainability appraisal which will include consideration of the likely social, economic and environmental impacts of expanded permitted development rights for solar panels. We will publish the sustainability appraisal for public consultation in due course.