It is not an exaggeration to say that this is a pivotal decision to make, so getting the right architectural designer for your project is important. Lets take a look at the facts....
There are lots of factors to consider, some objective like whether they have the appropriate qualifications and PI cover and some highly subjective such as whether you feel a good personal chemistry or whether their previous designs are in a style that you like.
An architectural designer’s role can range from having minimal input outside of draughting up the plans for planning purposes to that of semi project managing the build and involved in virtually every aspect. Some designers have multi-discliplinary skills, which can add value and save costs.
Your architectural designer will advise you on the planning guidelines for your area but heres is a useful video to get you started