Introduction
If you are considering a private ADHD assessment in London, you are not alone. NHS waiting times for ADHD assessment now routinely exceed three to five years in London and the surrounding areas. For many adults and parents of children who are struggling, waiting is simply not an option.
This guide explains exactly what a private ADHD assessment in London involves, what it costs, how long it takes, and what happens afterwards. Written by the clinical team at Harley Mind Care, a CQC-registered consultant psychiatrist-led clinic at 10 Harley Street.
Why are so many people seeking private ADHD assessments in London?
Demand for ADHD assessment has grown significantly over the past decade. Greater public awareness, better understanding of how ADHD presents in adults and in women, and growing recognition of late diagnosis have all contributed. At the same time, NHS capacity has not kept pace. In 2024, NHS England data showed over 196,000 people on neurodevelopmental waiting lists nationally.
Private assessment offers an alternative — not a shortcut, but a different pathway to the same clinical rigour, available within weeks rather than years.
What does a private ADHD assessment in London involve?
A thorough private ADHD assessment at a reputable clinic involves several stages:
Pre-assessment questionnaires. Before your appointment you will complete validated rating scales such as the Conners 4 (for children) or adult ADHD self-report scales. For children, the school is also asked to contribute independently. This multi-informant approach is essential — it captures how ADHD presents across different settings rather than relying solely on self-report.
Clinical interview. The assessment appointment itself typically lasts 60 to 90 minutes with a consultant psychiatrist. This is a detailed clinical conversation covering your current symptoms, developmental history, educational and occupational history, and the impact on your daily functioning.
Differential diagnosis. A good assessment does not simply confirm ADHD — it considers and rules out other conditions that can present similarly, including anxiety, depression, bipolar disorder, and autism. At Harley Mind Care every assessment considers the full clinical picture.
Written diagnostic report. Following the assessment you receive a full written report within approximately two weeks, setting out the clinical findings, diagnosis or absence of diagnosis, and specific recommendations for support and treatment.
How much does a private ADHD assessment cost in London in 2026?
Private ADHD assessment costs in London typically range from £600 to £1,500 depending on the clinic, the clinician’s qualifications, and what is included in the fee.
At Harley Mind Care, adult ADHD assessments start from £800. This includes all pre-assessment questionnaires, the clinical assessment with a consultant psychiatrist, the full written report, the first prescription at no additional cost if medication is recommended, and a free Shared Care Agreement letter to your GP.
Child and adolescent ADHD assessments start from £1,245, including Conners 4 parent and teacher rating scales, clinical assessment with a consultant child psychiatrist, full report, first prescription, and shared care documentation.
Interest-free instalment plans are available for families who need to spread the cost.
How long does a private ADHD assessment take?
From booking to receiving your report, the typical timeline at Harley Mind Care is four to six weeks. The assessment appointment itself is 60 to 90 minutes. For children, school input is required before the assessment can be completed — it is important to arrange this promptly after booking to avoid delays.
What happens after a private ADHD diagnosis?
A diagnosis opens access to treatment and support. If medication is recommended, your first prescription is provided. We then support a Shared Care Agreement with your GP so that ongoing prescribing transfers to the NHS — significantly reducing your long-term costs. Your report can be used for workplace adjustments, DSA applications for students, exam access arrangements, EHCP applications for children, and DVLA notifications where relevant.
Who conducts the assessment — and why it matters?
This is the most important question to ask any provider. At Harley Mind Care, every assessment is conducted by a consultant psychiatrist or consultant paediatrician — a doctor with a minimum of 13 years of specialist training, Royal College of Psychiatrists membership, and GMC Specialist Register listing. We do not use trainees for diagnostic work.
Some private providers use nurses, psychologists, or other clinicians for ADHD assessments. These clinicians can be skilled and experienced. However, for complex presentations, differential diagnosis, and prescribing decisions, consultant psychiatrist involvement provides an additional layer of clinical expertise. Always ask who will be conducting your assessment before you book.
Is a no GP referral needed?
At Harley Mind Care, no GP referral is needed. You can self-refer directly by booking online or calling 020 7047 8888. We do recommend informing your GP that you are seeking a private assessment, as this helps with onward care and shared care arrangements following diagnosis.
Book an assessment at Harley Mind Care
Harley Mind Care is a CQC-registered private psychiatry clinic at 10 Harley Street, London. All assessments are conducted by consultant psychiatrists or paediatricians. No GP referral needed. Virtual appointments available UK-wide.
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