The requirements for planning permission for roof-mounted solar panels can vary depending on the country, state, or local regulations In many jurisdictions, the installation of solar panels on residential or commercial roofs is considered a permitted development under certain conditions. These conditions may include:

1. Size and orientation: There may be limitations on the size and orientation of the solar panel system that can be installed without planning permission. It is important to check the specific regulations regarding the maximum size and preferred orientation of the panels.

2. Roof angle and visibility: Some regulations may dictate that the solar panels should not be visible from the ground or should maintain a certain angle relative to the roof surface. This is to ensure that the aesthetic appearance of the building or the surrounding area is not significantly affected.

3. Listed buildings or conservation areas: If your property is a listed building or located in a designated conservation area, there may be more stringent regulations regarding the installation of solar panels. In such cases, you may need to obtain special permissions or follow specific guidelines to ensure the panels blend in with the architectural style or character of the building.

4. Response from neighbors: In some cases, planning authorities may require you to notify and obtain consent from your neighbors if they may be affected visually by the installation of solar panels on your roof.

It is crucial to consult with your local planning authority or a professional solar installer to determine the specific regulations and requirements regarding planning permission for roof-mounted solar panels in your area. They will be able to provide you with accurate information and guidance to ensure compliance with the local regulations.