Planning permission is generally not required for garden offices! Garden Studios such as ours are classed as outbuildings that fall within your permitted development rights. Some properties in the UK don’t have permitted development rights, in which case planning permission would be required.
For peace of mind, we recommend checking the government’s online planning portal or visit your local council with a rough layout of your garden, and a photograph of the garden room you would like because more often than not the council will give you, ‘a letter of permitted development’.