There are three main routes to an adult ADHD assessment in the UK: through the NHS in the usual way, through the NHS using Right to Choose (in England), or by paying privately. They differ in who pays, how long you wait, and what happens afterwards. This guide explains each one honestly, including the free NHS options, so you can decide what fits.
Whichever route you take, the starting point is usually the same: a GP appointment.
Key takeaways
- All routes usually start with a GP referral. Only a specialist can diagnose ADHD, after a full assessment — not from a questionnaire alone (NICE NG87).
- Right to Choose (England only) lets you pick an NHS-funded provider at the point of referral, which can mean a shorter wait (NHS Choice Framework).
- NHS waits can be long: the independent ADHD Taskforce reported waits of up to 8+ years for adults in some areas (NHS England Taskforce, 2025).
- Going private means paying for the assessment, any titration, follow-ups and medicine — and your GP may or may not agree to take over prescribing later (Norfolk & Suffolk ICB).
- A private diagnosis can't move you up the NHS waiting list (Norfolk & Suffolk ICB).
What an assessment actually involves
Before comparing routes, it helps to know what you're being referred for. A proper ADHD assessment is a structured clinical process, not a quiz.
Under NICE guidance, a diagnosis should be made only by a specialist psychiatrist, paediatrician or other appropriately qualified professional. It requires a full clinical and psychosocial assessment, a developmental and psychiatric history, and, where possible, information from someone who knows you. It should never rest on a rating scale alone. Symptoms must meet recognised diagnostic criteria, cause at least moderate impairment, and be present in two or more settings (NICE NG87).
In practice, an adult assessment often takes a couple of hours. A UK quality standard published in 2024 recommends at least two hours of direct contact in most cases, whether face to face or by video (Adamou et al., 2024).
A quality checklist for any provider:
- Who carries out the assessment, and what ADHD training and professional registration do they have?
- Does it follow NICE — an interview, developmental history, information from someone who knows you, and evidence of impairment in two or more settings?
- Is it at least around two hours of direct contact, with a full written report?
- Are all the costs clear up front?
- What happens if your GP later declines shared care?
A provider that only diagnoses (and doesn't treat) may not need to register with the Care Quality Commission, so CQC registration matters most where the provider also prescribes (CQC).
Route 1: The standard NHS pathway
You see a GP, describe how symptoms affect your work, study or relationships, and — if it's appropriate — they refer you to a local NHS ADHD service (NHS).
- Cost: free.
- The catch: waiting times. The NHS says waits can be months or years, and the independent ADHD Taskforce described adult waits of up to 8+ years in some areas, with no national adult waiting-list data collected (NHS England Taskforce, 2025).
Route 2: Right to Choose (England)
Our dedicated guide to ADHD Right to Choose covers how to ask, what to do if your GP says no, and the shared care question in more detail.
In England, when your GP refers you, you have a legal right to choose which provider carries out your first outpatient appointment, including for mental health. The provider must hold an NHS contract for that service. If you choose one, the NHS still pays (NHS Choice Framework).
How to ask:
- Your GP agrees a referral is appropriate.
- You name a provider that holds an NHS Right to Choose contract.
- You complete that provider's forms.
- Your GP sends the referral.
- If you're not offered a choice, you can raise it with your Integrated Care Board (ICB).
Important limits:
- It applies in England only. It doesn't apply in Scotland, Wales or Northern Ireland (ADHD UK).
- It doesn't apply if you're already being treated for the condition, or using crisis services (NHS Choice Framework).
- During 2026, some ICBs introduced activity plans that limit how quickly Right to Choose providers can take referrals, so waits vary by area (South West London ICB).
Route 3: Going private
You can usually book a private assessment without a GP referral, and waits are typically shorter. The trade-off is cost, and some things to plan for afterwards (Norfolk & Suffolk ICB):
- you pay for the assessment, and for any titration, follow-ups and medicine
- your GP may reassess the diagnosis and can decline to take over NHS prescribing
- a private diagnosis can't move you up the NHS waiting list
Published private assessment prices (as advertised by providers, correct as of September 2026 — always confirm the current figure, and what's included, before booking):
| Provider | Assessment (published price) |
|---|---|
| ADHD Certify | £495 online / £795 in person |
| Clinical Partners | £895 |
| Psychiatry-UK | £950 |
| ADHD 360 | From £950 |
Titration, follow-ups and medicine are usually charged separately, so ask for the full first-year cost, not just the assessment fee.
How the three routes compare
| Feature | NHS (standard) | Right to Choose | Private |
|---|---|---|---|
| Who pays | NHS | NHS | You |
| Where it applies | UK-wide | England only | UK-wide |
| GP referral | Yes | Yes | Usually not needed |
| Typical wait | Long (months to years) | Varies; can be shorter | Usually shortest |
| Who diagnoses | NHS specialist | Contracted specialist | Private specialist |
| Ongoing prescribing | NHS | Via shared care with your GP | Private, unless your GP agrees shared care |
What happens after a diagnosis
If medication is appropriate, it's started and monitored by a specialist through a process called titration, where the dose is adjusted carefully with regular health checks (NICE NG87).
Longer term, many people move to shared care, where a GP takes over prescribing under an agreement with the specialist. This is voluntary for GPs, who can decline it, so it's worth asking any provider what happens if your GP says no (BMA).
If the symptoms that led you here also sound like they could overlap with other things, our guide to ADHD in women covers how ADHD is often mistaken for anxiety or low mood.
One reassuring point: you don't need a diagnosis to get support at work. Access to Work doesn't require a diagnosis, and under the Equality Act a worker doesn't need one to be entitled to reasonable adjustments (GOV.UK; Acas). That can take the pressure off rushing into a low-quality assessment.
Related: Is ADHD a disability? UK rights, PIP and support at work
Renvo can help. Our ADHD service starts with a free initial consultation to talk through your situation and the right next step for you. It isn't the assessment itself — it's the first conversation, with a clinician. Book a free consultation
Is there an NHS online ADHD test?
No. There's no official NHS online test that diagnoses ADHD. The NHS links to a charity self-screening questionnaire, which itself says only a clinician can diagnose ADHD (ADHD UK). A positive screen is a prompt to seek an assessment, not a diagnosis.
Related: our free adult ADHD self-screener is a starting point for a conversation, not a diagnosis.
When to get urgent help
If you ever feel unable to keep yourself safe (NHS):
- call 999 or go to A&E if a life is at risk
- for urgent mental health help, call NHS 111 and choose the mental health option
- Samaritans are free, any time, on 116 123
This service is not a substitute for emergency care.
What the price actually covers
The headline assessment fee is rarely the whole cost, and the difference between providers is usually what sits outside it rather than the number on the website.
| Item | Typically included? | Why it matters |
|---|---|---|
| Pre-assessment questionnaires | Usually | Completed before the appointment |
| The diagnostic appointment | Yes | Normally 60–120 minutes with a specialist |
| Written report | Usually, but check | You need this for your GP, employer or university |
| Titration appointments | Usually extra | Where treatment is involved, this is several appointments |
| Follow-up reviews | Usually extra | Ongoing, often at a set interval |
| Prescriptions and dispensing | Extra | Charged separately, and privately priced |
| Shared-care transfer to your GP | Not guaranteed | Depends entirely on your GP practice and local policy |
Two costs catch people out. The first is titration — finding the right treatment and dose takes multiple appointments over months, and at private rates that can exceed the assessment fee itself. The second is what happens if shared care is declined: your GP is not obliged to take over prescribing, and if they do not, the ongoing private cost continues indefinitely rather than ending after diagnosis.
Ask any provider three questions before booking: what the total cost looks like over the first twelve months, whether the written report is included, and what happens if your GP declines shared care.
Honest FAQs
How much is a private ADHD assessment in the UK?
Published prices from UK providers at the time of writing ranged from roughly £495 to £950 for the assessment itself. Titration, follow-up appointments and medicine are normally charged on top, so the first-year total is usually considerably higher than the headline figure. Always confirm the current price and what is included before booking.
How much does an ADHD assessment cost on the NHS?
Nothing. NHS assessment is free, including through Right to Choose in England. The cost is time rather than money — waits vary widely by area and can run to years in some regions.
Why do private ADHD assessment prices vary so much?
Mostly because of who conducts the assessment and what comes with it. A consultant psychiatrist costs more than a specialist nurse or psychologist, an in-person appointment more than an online one, and some fees include the written report and a follow-up while others do not. A higher price does not automatically mean a more thorough assessment, so compare what is included rather than the number alone.
Can a GP diagnose ADHD in adults?
No. A GP is the starting point and can refer you, but only a specialist can diagnose ADHD, after a full assessment (NHS; NICE NG87).
How long is the NHS wait for an adult ADHD assessment?
It varies widely by area, from months to years. The independent ADHD Taskforce reported waits of up to 8+ years for adults in some places (NHS England Taskforce, 2025).
What is Right to Choose, and how do I ask?
In England, it's your legal right to choose an NHS-funded provider at the point of GP referral, which can shorten your wait. Ask your GP to refer you to a named provider that holds an NHS Right to Choose contract (NHS Choice Framework).
Will my GP accept a private ADHD diagnosis?
They may reassess it, and they can decline to take over NHS prescribing through shared care, which is voluntary for GPs. Ask any private provider what happens if your GP says no (Norfolk & Suffolk ICB; BMA).
How much does a private ADHD assessment cost in the UK?
Published prices from providers at the time of writing ranged from about £495 to £950 for the assessment, with titration, follow-ups and medicine usually charged on top. Always confirm the current, full cost before booking.
This article is general information, not medical advice. Prices and waiting times were correct as of September 2026 and change frequently — check directly with providers.
