Many psychotherapists believe that the nuances of psychotherapy cannot be captured by questionnaire-style observation, and prefer to rely on their own clinical experiences and conceptual arguments to support the type of treatment they practice.
Recommendation: The clear opening of a doorway should be at least 32. This would require a minimum 34 or 2'-10 door. For universal design, the minimum clear width is 34. If the existing structure precludes changing the opening then a minimum 24 or 2'-0 door is allowable. The door opening width is measured from jamb to jamb.
Standard door sizes allow for the mass production of doors ready-made for installation. This helps drive down the cost of a door, as having custom doors made is generally more expensive. In Australia the most common standard door width is 820mm, but there are other sizes that are popularly used.