If you believe your client might have Hoarding Disorder (HD) based on the DSM-V definition, several standard rating scales listed here can help you make a diagnosis and assess the severity and impact of HD on the client.
Saving Inventory-Revised (SIR)
The Saving Inventory-Revised is a 23-item questionnaire designed to measure three features of HD: excessive acquisition, difficulty discarding, and clutter. Scoring instructions are located at the end of the questionnaire, along with a table showing the average scores of people who do not suffer from HD, as well as cutoff scores that typically indicate a significant clinical hoarding problem and/or HD diagnosis.
Download the SIR here.
Hoarding Rating Scale (HRS)
The Hoarding Rating Scale is a brief 5-item scale that can be given as a semi-structured clinician interview or as a questionnaire. This tool includes 5 questions about clutter, difficulty discarding, excessive acquisition, and the resulting distress and impairment caused by hoarding. Initial studies suggest that a score of 14 or higher on the HRS indicates a probable hoarding problem/HD diagnosis.
Download the HRS here.
Clutter Image Rating (CIR)
The Clutter Image Rating is a tool that helps standardize definitions of clutter by showing a series of images depicting rooms in various stages of clutter. This allows the client, the clinician, or another observer to select the image on the scale that best corresponds with the state of the main rooms in the home. The CIR contains three sets of 9 pictures to clarifiy the level of clutter in the kitchen, the living room, and the bedroom. The living room photos can be used to rate other types of rooms in the home. In general, rooms that are rated as picture #4 or higher indicate a probable hoarding problem/HD diagnosis.
Download the CIR here.