Your decorator will be one of the last professionals involved with a new project. You could find that your builder will find a decorator for you and take responsibility for the work carried out. However, if you need to choose a decorator yourself here are some tips to help you choose the right one.
Be quite clear about the decoration that you required. Be as specific as you possibly can with your requirements.
Ask to see examples/photos of other work he has carried out. This will be more important when you want a decorator to carry out complex work.
Ask the decorator questions to establish whether he has the specialist skills to carry out the work you require.
Will the decorator be required to work around other building activity? If so, make this clear from the start.
Let the decorator know what the room will be used for and what items of furniture will be in the room.
Make sure the decorator listens to your requirements and really understands them. It will probably be a long time before you decorate again so you want to get it right.