Work a garage and outbuilding builder can help with
Detached garages
Describe what is there now, what you want changed and any photos, so quotes cover the same scope.
Workshops
Mention the size, access and any deadlines so tradespeople can price the job accurately.
Garden rooms
Say what finish or standard you expect and whether materials are included.
Outbuilding repairs
Add anything that could affect the work, such as parking, pets or working hours.