How Much Does a Private Autism Assessment Cost in the UK? (Adults & Children)
- Suits You Media Developer
- October 17, 2026
- Edited 6 minutes ago
A private autism assessment in the UK usually costs between about £800 and £3,500, depending on who carries it out, the tools used and whether it happens online or in person. At Harley Street Mental Health (HSMH), adult and child autism assessments cost £1,850 online or £2,300 in person (October 2026), with a written report included.
This guide is for adults and parents considering a private autism assessment who want to know what the fee should buy, and how to tell a thorough assessment from a quick screen.
Private autism assessment costs in the UK at a glance (2026)
Prices vary because “autism assessment” can mean anything from a questionnaire review to several hours with a multidisciplinary team. These are published UK ranges, not quotes from any single clinic.
Published UK price ranges for private autism assessment
| Assessment type | Typical UK price |
|---|---|
| Adult, online | £800–£1,500 |
| Adult, in person | £1,200–£2,000 |
| Adult, all formats | £1,900–£3,500+ |
| Child or adolescent | £1,500–£2,500+ |
| Extra school report or meeting | £100–£300 |
| Follow-up appointment | £150–£300 |
Sources: TreatCompare, May 2026 (all rows except “all formats”); Oxford CBT, Aug 2023 (adult, all formats).
Location and clinician mix both affect price, according to TreatCompare.
What Harley Street Mental Health charges
Our autism assessment fees are fixed and published in advance. The table below is taken from our pricing page as it stood on 6 October 2026.
Harley Street Mental Health autism assessment fees (October 2026)
| Assessment | Length | Online | In person (Harley Street) | Included (as stated on our pricing page) |
|---|---|---|---|---|
| Adult ASD appointment | 120–180 minutes | £1,850 | £2,300 | Full NICE-compliant assessment; comprehensive report and personalised treatment plan |
| Child ASD appointment | Up to 90 minutes | £1,850 | £2,300 | Full NICE-compliant assessment [CONFIRM: B3, child ASD pathway meets NICE CG128 (assessing team, school input, physical examination)]; comprehensive report and personalised treatment plan |
The price you see is the price you pay for the assessment and report. You can see every service we offer on our full fee list.
For children, the assessment is carried out by [CONFIRM: B3, who carries out the child assessment, whether school or nursery information is gathered, and whether a physical examination is included]. If you need extra letters for school or work, ask us before you book so there are no surprises.
Fixed fee, report included. Online or at Harley Street. Book an assessment · See all fees
What your fee should pay for (and why a thorough assessment costs more)
NICE sets out what a comprehensive autism assessment should involve. Each part takes trained clinician time, which is most of what you pay for. Recommendation numbers are in brackets.
For adults (NICE CG142)
NICE guideline CG142 says a comprehensive assessment for adults should include:
- professionals who are trained and competent, working in a team-based way that draws on a range of professions and skills (1.2.5)
- where possible, a family member, partner, carer or other informant, or documentary evidence such as school reports, covering current and past behaviour and early development (1.2.5)
- a discussion at the start about the purpose of the assessment and how the outcome will be fed back to you (1.2.6)
- questions about core autistic features present in childhood and continuing into adulthood, early developmental history, functioning at home, in education or at work, and sensory sensitivities (1.2.7)
- direct observation of core autistic features, especially in social situations (1.2.7)
- assessment for other possible explanations and co-occurring conditions, including other neurodevelopmental conditions such as ADHD, anxiety, depression and learning disability (1.2.10)
- a care plan based on the assessment (1.2.13)
For children and young people (NICE CG128)
NICE guideline CG128 covers under-19s. It recommends:
- a multidisciplinary autism team whose core membership includes a paediatrician and/or child and adolescent psychiatrist, a speech and language therapist and a psychologist (1.1.3)
- a developmental history, observation of the child’s social and communication skills, a medical history, a physical examination, consideration of other diagnoses, assessment for co-occurring conditions and a profile of the child’s strengths and needs (1.5.5, 1.5.6)
- information from other sources, or further observation in settings such as school or nursery, if what parents report differs from what clinicians see in the clinic (1.5.9)
- a written report for parents explaining the findings and the reasons for the conclusions, shared with the GP (1.8.4, 1.8.5)
Where ADOS-2 and ADI-R fit (and what they add to the cost)
The ADOS-2 is a standardised observation of social communication and behaviour. The ADI-R is a structured interview about early development with a parent or someone who knew you as a child. Both take trained time to administer and score, which is part of why assessments using them cost more than questionnaire-based ones.
NICE lists the ADI-R and the ADOS-G (the earlier version of ADOS-2) among tools to consider, particularly for more complex assessments (CG142 1.2.8–1.2.9), and suggests considering an autism-specific tool for children (CG128 1.5.5). It does not make them compulsory, and it says no autism-specific tool should be used on its own to make a diagnosis (CG128 1.5.11).
At Harley Street Mental Health, adult assessments use “either an assessment informed by the ADI-R or an assessment informed by the ADOS-2”. Which one depends on your circumstances and on whether you are assessed in person at Harley Street or virtually.
The written report and feedback session
The report is often the part of the fee you use most. A good report sets out:
- the diagnostic conclusion and the reasons for it
- which ICD-11 or DSM-5 criteria are met
- any co-occurring conditions identified
- a profile of strengths and needs
- practical recommendations for your GP, employer, university or school
NHS guidance describes a similar report. It is the document a GP, employer (reasonable adjustments), university (Disabled Students’ Allowance) or school will read, so a thin report can cost you more later.
What makes the price go up or down
Six things explain most of the difference between quotes:
- Clinician type and seniority. A consultant psychiatrist or senior psychologist usually costs more than a single non-medical practitioner.
- One clinician or a team. NICE describes team-based assessment for adults (CG142 1.2.5) and a multidisciplinary core team for children (CG128 1.1.3). More professionals means more paid time.
- Structured tools or questionnaires only. Assessments informed by ADOS-2 or ADI-R take longer than those based on questionnaires.
- Online or in person. In-person assessments carry room and travel-time costs. At HSMH the difference is £1,850 online against £2,300 at Harley Street.
- Age. Child assessments usually involve more informants, often school input, and under NICE a physical examination (CG128 1.5.5).
- Add-ons charged separately. Some providers charge extra for school reports or meetings (£100–£300) and follow-ups (£150–£300), according to TreatCompare. ADHD often co-occurs with autism, and if it is also suspected, a separate ADHD assessment may add to the total.
Is the cheapest autism assessment worth it? Red flags to check
A lower price does not automatically mean lower quality. A shorter online assessment with one experienced clinician can suit some adults with a clear developmental history.
The risk with very cheap options is that they skip what makes a diagnosis stand up later: informant history, direct observation and a proper report. These questions help you compare any provider, including us.
Questions to ask any provider before you pay:
- Who will assess me, and are they registered? Doctors should be on the GMC register, and psychologists and speech and language therapists on the HCPC register. You can check both yourself.
- Will you speak to someone who knew me as a child, or review school records? NICE recommends this where possible (CG142 1.2.5).
- Is the diagnosis based on a questionnaire or online test score alone? The AQ-10 is used to decide who should be offered a comprehensive assessment (CG142 1.2.3), and no single tool should be used alone to diagnose (CG128 1.5.11).
- Will you assess for other conditions, such as ADHD, anxiety or learning disability? (CG142 1.2.10)
- Do I get a full written report, and can it be shared with my GP? For children, NICE recommends both (CG128 1.8.4–1.8.5).
- Is there a feedback appointment, and what happens if the result is unclear? NICE suggests considering a second opinion when there is uncertainty (CG142 1.2.16; CG128 1.6.2).
- For children: who is on the team, will you gather information from school, and is there a physical examination? (CG128 1.1.3, 1.5.5, 1.5.9)
Red flags. Be cautious of any service that promises a diagnosis in advance, diagnoses from an online form, gives no written report, does not name the clinician, or makes no attempt to involve an informant.
Ask us any of these questions before you book: speak to our team.
Is a cheaper route available?
Yes. An NHS assessment is free, usually through a GP referral, but NHS guidance notes it can take “a few months or longer”. In England, you can choose which NHS service does the assessment under Right to Choose, at no cost to you. Harley Street Mental Health also provides NHS-funded adult assessments, including an NHS Right to Choose autism assessment in West Yorkshire pathway for eligible adults.
Will a private diagnosis be accepted?
GPs and the NHS. GPs and local NHS services make their own decisions about private reports. A report from a registered clinician that shows a thorough, NICE-aligned assessment is more likely to be accepted, but no provider can guarantee it.
Schools and EHCPs. Under the SEND Code of Practice, a local authority decides whether to carry out an EHC needs assessment based on evidence of a child’s special educational needs and progress (para 9.14). Schools should not delay extra support while they gather evidence (para 6.19). A diagnosis is not what triggers support, but a clinical report can help show what a child needs. The process is the same whatever the condition.
Employers and universities. A report can support requests for reasonable adjustments at work. For Disabled Students’ Allowance, autistic students can provide a report or letter from a doctor or medical professional confirming the diagnosis.
How to book a private autism assessment at HSMH
Booking a private autism assessment with us follows four steps:
- Get in touch. Book online or speak to our team if you have questions or are booking for a child.
- Share background information. Where possible, we gather developmental history from a family member or long-term acquaintance.
- Attend your assessment. Choose online or in person at Harley Street. The adult appointment lasts 120–180 minutes and the child appointment up to 90 minutes.
- Receive your report and feedback. For adults, our service page says the detailed written report and feedback follow within a few weeks of the assessment.
Frequently asked questions
Does health insurance cover a private autism assessment?
It depends on your policy. Many policies limit or exclude developmental conditions, so ask your insurer before booking about pre-authorisation and which providers they recognise.
Why does an in-person autism assessment cost more than online?
An in-person assessment includes clinic room time and face-to-face clinician time. Some people and families find it easier to engage in the room. At Harley Street Mental Health it costs £2,300 in person against £1,850 online, and both lead to the same type of report.
Is an online autism test the same as an assessment?
No. Online questionnaires such as the AQ-10 are screening tools that help decide who should be offered a full assessment. NICE says no single tool should be used alone to diagnose autism, so a test score is not a diagnosis.
Does the price include the diagnostic report?
At Harley Street Mental Health, yes. Our pricing page lists a comprehensive report and personalised treatment plan for both adult and child ASD assessments. With other providers, check whether reports, follow-ups and school letters cost extra.
Can I get an EHCP for my child with a private autism diagnosis?
An EHC needs assessment is based on a child’s special educational needs, not on a diagnosis, under the SEND Code of Practice. A private report can help evidence those needs, but the local authority makes the decision.
Is there a free alternative to paying privately?
Yes. You can ask your GP for an NHS referral, and in England you can use Right to Choose to pick an NHS-funded provider. Your GP can explain the referral options available where you live.
How much does an ASD diagnosis cost for adults vs children?
At Harley Street Mental Health, an adult or child ASD assessment costs £1,850 online or £2,300 in person. Published UK ranges run from about £800 to £3,500 for adults and £1,500 to £2,500 or more for children.
Book a private autism assessment at Harley Street Mental Health
Fixed, published fees, a comprehensive written report, and a choice of online or in person at Harley Street.
Book a private autism assessment · Child enquiries: speak to our team · See our full fee list
