How Long Does a Private ADHD Assessment Take in the UK?
From first contact to diagnosis in hand, most private ADHD assessments take 2 to 8 weeks. Here's a realistic breakdown of every stage — booking, the appointment, your report, and what comes after.
The short answer
From first contact to diagnosis in hand, most private ADHD assessments in the UK take 2 to 8 weeks in total. The assessment appointment itself typically lasts 1 to 3 hours. After that, you'll usually receive your diagnostic report within 1 to 4 weeks.
Compare that to the NHS route, where waiting lists for an ADHD assessment currently average 2 to 5 years in most parts of the UK. For many people, that wait is the primary reason for going private.
Stage 1: Booking and waiting for your appointment
Once you've chosen a clinic and made your booking, the waiting time for your actual assessment appointment varies significantly between providers.
Fastest providers: under 2 weeks
Several online providers currently offer assessments within 1 to 2 weeks of booking. Some in-person clinics in major cities have similarly short waits.
Mid-range providers: 3–6 weeks
This is common for established clinics with good reputations that see high demand.
Right to Choose providers: 6–12 weeks
Providers like Psychiatry-UK and ADHD 360 often have longer queues due to the combination of NHS-funded and private patients. The trade-off is that the assessment is free.
You can compare current waiting times across all UK providers on our city pages — every clinic listing shows an estimated wait time in weeks.
Stage 2: Pre-assessment preparation
Before your assessment appointment, most clinics will ask you to complete some preparatory work. This typically includes filling in standardised questionnaires such as the DIVA-5, CAARS, or Conners rating scales. Some clinics also ask for a developmental history questionnaire and may request that a family member or partner completes a separate questionnaire about your childhood behaviour.
This preparation usually takes 1 to 3 hours of your own time, spread over a few days. Some clinics send the questionnaires immediately after booking, so you can complete them while waiting for your appointment. Others send them closer to the assessment date.
A few providers also offer a pre-screening call — a short 15 to 30 minute conversation to confirm that a full assessment is appropriate and to answer any questions you might have. This is usually free.
Stage 3: The assessment appointment itself
The assessment appointment is the core of the process. A qualified clinician — usually a psychiatrist, specialist nurse, or clinical psychologist — evaluates you using standardised diagnostic criteria (DSM-5 or ICD-11).
Adults
Typically 1–2 hours. A detailed clinical interview covering current symptoms, daily life impact, childhood history, and mental health background.
Children
Usually 2–3 hours, sometimes across two sessions. Includes input from parents and sometimes teachers, plus direct observation.
Some providers include a computerised attention test like QbCheck or TOVA as part of the assessment. This adds about 20 to 30 minutes but provides objective data alongside the clinical interview.
The assessment can be online (via video call) or in-person at a clinic. Online assessments are equally valid for adults and are generally quicker to arrange. For more on the differences, see our guide on online ADHD assessments.
Stage 4: Getting your results and report
After the assessment, there are three possible outcomes: a positive ADHD diagnosis, no ADHD diagnosis, or a recommendation for further assessment.
Most clinics will give you a verbal indication of the outcome at the end of the assessment itself, so you won't leave without any idea of the result. However, the full written diagnostic report takes longer.
Stage 5: Medication and shared care
If you're diagnosed with ADHD and the clinician recommends medication, there's one more stage before treatment is fully set up: titration — the process of finding the right medication and dose.
Titration usually takes 4 to 12 weeks and involves regular check-ins with a prescriber (usually every 2 to 4 weeks) while your dose is adjusted. Some clinics include titration in their initial assessment fee, while others charge separately — typically £150 to £400 for the full titration process.
Once your medication is stabilised, most providers will write to your GP requesting a shared care agreement. This means your GP takes over prescribing at NHS rates (£9.90 per item) instead of private rates (£30–£150/month). Not all GPs agree to shared care, but most do if the assessment was conducted by a registered provider following NICE guidelines.
For more on the costs involved at each stage, see our ADHD assessment cost guide. For information on shared care agreements, see our guide on shared care.
Total timeline: booking to treatment
| Stage | Typical time |
|---|---|
| Booking to assessment appointment | 1–8 weeks |
| Pre-assessment questionnaires | 1–3 hours (your time) |
| Assessment appointment | 1–3 hours on the day |
| Assessment to written report | 1–4 weeks |
| Titration (if medication recommended) | 4–12 weeks |
| Total: booking to stabilised treatment | 2–6 months |
Compare that to the NHS, where the wait for an initial assessment alone is typically 2 to 5 years in most areas.
How to speed things up
If getting assessed quickly is your priority, here are a few things to consider when choosing a provider.
- Choose a clinic with a short waiting list. Check our city pages for current wait times. Online providers generally have shorter waits than in-person clinics.
- Complete your pre-assessment questionnaires as soon as they arrive. Delays in returning these can push back your appointment.
- Ask about report turnaround times before booking. A 1-week report turnaround versus a 4-week one makes a real difference to how quickly you can start treatment.
- Check whether titration is included in the assessment fee. Some clinics offer all-inclusive packages covering assessment, diagnosis, report, and titration support, which can be faster and more cost-effective.
- Consider online assessments if you're in an area with limited local options. Online assessments are available UK-wide, equally valid, and often have shorter waiting times.
Frequently asked questions
How long does the actual ADHD assessment appointment take?
For adults, typically 1 to 2 hours. For children, usually 2 to 3 hours, sometimes split across two sessions. Some providers also include a 20 to 30 minute computerised attention test.
How long do I have to wait for a private ADHD assessment?
Waiting times range from under a week to 12 weeks, depending on the provider. Online providers generally have the shortest waits. You can compare current wait times on our city pages.
How long does it take to get the diagnostic report?
Most providers deliver a written report within 2 to 3 weeks of the assessment. The fastest clinics provide reports within 3 to 5 working days. Some take up to 6 weeks.
How long does titration take after diagnosis?
Medication titration — finding the right dose — typically takes 4 to 12 weeks, with check-ins every 2 to 4 weeks. Some clinics include titration in their assessment fee, while others charge separately.
Is an online assessment faster than in-person?
Generally yes. Online providers tend to have shorter waiting lists because they are not limited by physical clinic capacity. The assessment itself takes a similar amount of time, but you also save travel time.
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