Mental Capacity Assessments
Mental Capacity Assessor: How to Choose the Right Capacity Assessment Provider
Specialist mental capacity assessors for legal, financial, welfare and Court of Protection decisions across England and Wales
What is a mental capacity assessor?
A mental capacity assessor is a professional who assesses whether a person can make a specific decision at the time it needs to be made. Capacity is not assessed in general: a person may be able to manage everyday spending but not sell a house, or decide where they want to live but not conduct litigation. A proper assessment is therefore decision-specific, time-specific and evidence-based.
Plain English
For families and professionals
England and Wales
National coverage
Registered professionals
Written and reviewed
Our registered social workers and psychologists complete decision-specific mental capacity assessments for families, solicitors, professional deputies, case managers, local authorities and other professionals who need clear, evidence-based capacity reports. The quality of the assessor matters because the report may be relied on by families, solicitors, deputies, attorneys, the Office of the Public Guardian, the Court of Protection or other professionals.
An assessor may be a social worker, psychologist, doctor, nurse, occupational therapist, speech and language therapist or another suitably experienced professional. The important question is not the job title. It is whether they have the knowledge, experience, independence and report-writing ability to apply the legal test properly and explain their opinion clearly. You can read more in our guide Who can assess mental capacity?
Decisions a capacity assessor may be instructed on
We assess capacity for a wide range of decisions, including:
How to choose a mental capacity assessor
A good assessor should be able to do more than meet the person and give a conclusion. Look for evidence of the following:
Decision-specific assessment. The assessor starts by clarifying the exact decision or decisions being assessed, why the decision needs to be made now, the options available and the consequences of each.
Knowledge of the Mental Capacity Act 2005. The statutory test is applied rather than relying on diagnosis, age, presentation, vulnerability or risk alone, and the person is supported to make their own decision wherever possible.
Clear relevant information. A strong assessment identifies the information the person needs to understand, retain, use and weigh for the particular decision. The relevant information for an LPA assessment is not the same as for testamentary capacity, deputyship, litigation, residence, care, contact, gifts, tenancy, equity release or property sale.
Evidence of practicable steps. The report records the steps taken to help the person participate, such as accessible language, visual prompts, breaks, familiar environments, interpreter support and communication aids. The point is not simply to test the person but to give them a fair opportunity to make the decision for themselves.
Ability to evidence impairment of the mind or brain. The report explains how the evidence supports the presence of an impairment of, or disturbance in the functioning of, the mind or brain, and how it affects the specific decision, drawing on records, clinical history and structured cognitive or psychometric tools where clinically relevant.
Court-ready report writing. For solicitor-led, contested or court-facing matters the report sets out the instructions, documents reviewed, assessment method, relevant information, functional analysis, reasoning and conclusion, with CPR Part 35 and Practice Direction 35 considered from the outset where they apply.
Current legal knowledge. A strong assessor knows when case law matters, from Banks v Goodfellow in testamentary capacity to CPR Part 35 duties in litigation, and explains it clearly where it affects the opinion.
Common problems with poor capacity assessments
- Assessing capacity globally rather than for a specific decision
- Relying too heavily on diagnosis
- Failing to identify the relevant information
- Ignoring practicable steps and communication support
- Confusing risk, disagreement or vulnerability with incapacity
- Failing to show the causal link between impairment and inability to decide
- Ignoring executive functioning or real-world decision-making
- Providing a conclusion without analysis, or falling short of CPR Part 35 standards where expert evidence is needed
- Assessing capacity globally rather than for a specific decision
- Relying too heavily on diagnosis
- Failing to identify the relevant information
- Ignoring practicable steps and communication support
- Confusing risk, disagreement or vulnerability with incapacity
- Failing to show the causal link between impairment and inability to decide
- Ignoring executive functioning or real-world decision-making
- Providing a conclusion without analysis, or falling short of CPR Part 35 standards where expert evidence is needed
Our assessment process and what a strong report includes
Every instruction begins with clarifying the exact decision or decisions to be assessed and the report format required, whether that is a COP3, an LPA assessment, a litigation report or testamentary capacity. We then identify and review the evidence needed before the assessment, which may include medical records, care records, social work notes, legal documents, draft Wills, LPA forms, financial information, court papers and previous assessments.
Before the assessment we identify the relevant information the person needs to understand, retain, use or weigh, and the support that may help them make the decision for themselves.
Assessments are usually completed face to face, though remote assessment may be appropriate in some cases. The assessor explains the purpose of the assessment, checks communication needs and explores the decision in a structured way, before completing the functional and diagnostic analysis. Where appropriate, we respond to reasonable clarification questions from instructing professionals after the report is delivered.
A strong report sets out the specific decision assessed, who instructed the assessor and why, the documents reviewed, the relevant information, the practicable steps taken, the person's presentation and responses, the evidence of impairment, the analysis of understanding, retention, use and weighing, and communication, the causal link between any impairment and the inability to decide, any fluctuating or borderline capacity, relevant case law, and a clear conclusion with professional reasoning.
Where required, reports include CPR Part 35 wording and a statement of truth. Where an existing report does not do this properly, a critical review or second opinion may be needed.
What makes Nellie Supports different
Nellie Supports is not a one-person assessment service or an ad hoc list of occasional assessors. We are a social work led multidisciplinary specialist practice working across England and Wales, operating through a permanent, full-time employed team that has completed more than 11,000 assessments. Complex, disputed and court-facing capacity questions are core work for the team.
Our assessment model is built around professional standards, supervision, peer learning, report quality and ongoing professional development. New assessors complete structured induction, supervised practice and shadowing, the team receives ongoing CPD and reflective supervision, and in complex or court-facing matters report quality and peer review focus on clarity, evidential sufficiency and the link between the person's impairment and their ability to make the specific decision.
Frequently Asked Questions
Does a mental capacity assessor have to be a doctor?
No. An assessor may be a social worker, psychologist, doctor, nurse, occupational therapist, speech and language therapist or another suitably experienced professional. What matters is the knowledge, experience, independence and report-writing ability to apply the legal test properly.
Why does the assessment have to be decision-specific?
Because capacity is not assessed in general. A person may be able to make one decision but not another, so the assessor must identify the exact decision, the relevant information for it and the consequences of the options available.
Does psychometric or cognitive testing replace the legal test?
No. Testing does not replace the Mental Capacity Act test, but it can strengthen the evidential basis of a report where cognition, memory, reasoning or executive functioning is in issue.
When does CPR Part 35 apply?
Where a report is prepared for litigation or may be relied on as expert evidence. Those reports should be written with the expert's duties in mind from the outset, including independence, reasoning and a statement of truth.
This guide is general information about mental capacity assessment in England and Wales, not legal advice, and does not create a professional relationship. Nellie Supports provides independent social work assessment, evidence and advocacy support. We do not provide regulated legal advice, and where a legal remedy is needed we will say so and support your solicitor's work.