Most domestic solar thermal panels do not need planning permission and are covered by permitted development rights. There are restrictions on the size and location of these systems. If you live in a conservation area or listed building, or want to install a very large solar thermal system, check with your local authority to see if you will need planning permission.
Guernsey
Guernsey is an island off the French coastline yet still keeps British Crown dependency. The island includes a population of 66,000 as well as a density of 2,578 individuals for each square mile. Combined with the other significant island of Jersey, Guernsey forms the group referred to as Channel Islands. Guernsey housing is divided between local market houses and open market properties. Anybody can live in open market buildings, but local market is tied to individuals who qualify. For all property improvements on the Guernsey Island, be sure to work with vetted experts to ensure a great price and a good quality finish.