At a glance
The NHS autism assessment landscape is in active change. The 2026/27 NHS Payment Scheme introduced ICB-level caps that may affect Right to Choose capacity. NHS England's transition to the Department of Health and Social Care by around 2027 may further reshape commissioning. ICBs are also being reduced from 42 to 26 through 2025–26. Private assessment costs and waiting times also vary by provider — always check current provider information for the most up-to-date situation.
Many people seeking an autism diagnosis in the UK face a difficult decision: wait for an NHS assessment or pursue a private diagnosis.
NHS autism services are free but often involve long waiting lists. Private assessments can be accessed more quickly but require paying directly for the evaluation.
This guide explains how NHS and private autism assessments differ, including waiting times, costs, and when each option may make sense.
How NHS autism assessments work
Most autism diagnoses in England begin with a referral from a GP.
After referral, patients are typically placed on a waiting list for a specialist autism assessment service. Assessments are usually carried out by multidisciplinary teams that may include psychiatrists, psychologists, and speech and language specialists.
NHS autism assessments follow recognised diagnostic standards and are free at the point of use. Assessments are expected to follow NICE clinical guidelines (CG128 for adults, CG170 for children and young people). If you are considering a private assessment, you may wish to check that the provider follows these recognised diagnostic standards.
However, NHS autism diagnosis waiting times can be long in many areas.
NHS autism assessments are free and follow recognised diagnostic standards. However, waiting times in England often range from 12 to 36 months or longer, depending on local service capacity. These figures are approximate and based on data reported by NHS trusts and Integrated Care Boards.
Current NHS autism assessment waiting times across England.
How private autism assessments work
Private autism assessments are offered by independent clinics and specialists.
Patients usually book an appointment directly with the provider rather than waiting for an NHS referral pathway.
Private assessments may follow similar diagnostic frameworks used in the NHS, but the process and timeline are typically faster.
Waiting times for private autism assessments are often a few weeks to a few months, depending on the provider.
Cost of private autism diagnosis in the UK
Private autism assessments can vary in cost depending on the provider and the complexity of the assessment.
Typical price ranges include:
- Around £1,500 to £3,000 for adult autism assessments, though fees may be higher depending on the provider, the complexity of the assessment, and whether the assessment is for an adult or a child
- Some providers may charge additional fees for follow-up reports or support
Patients considering private diagnosis should ensure that the provider uses recognised diagnostic tools and that the assessment will be accepted for relevant support services where needed.
Private autism assessment costs in the UK commonly range from around £1,500 to £3,000, though fees may be higher depending on the provider and complexity. While faster than NHS pathways, they require upfront payment and may not always integrate seamlessly with NHS follow-up services.
Waiting time comparison
Typical timelines:
| Pathway | Referral route | Typical waiting time |
|---|---|---|
| NHS autism diagnosis | Referral required through GP | 1–3 years or longer |
| Private autism diagnosis | Direct booking with a provider | 2–12 weeks |
| Right to Choose | Referral required through GP | Varies by provider, may be shorter than local NHS service |
These differences are one reason many patients explore alternative NHS pathways such as Right to Choose.
Right to Choose: an alternative to both
Under the NHS Constitution, patients in England referred for their first outpatient appointment have the legal right to choose their provider. This includes autism assessments. However, your GP must first agree that a referral is clinically appropriate.
This pathway is still funded by the NHS but may allow patients to access autism assessments through different providers.
How Right to Choose works for autism assessments in England, who's eligible, and how to request a referral.
Check your Right to Choose eligibility
Not sure whether you qualify? Use our free eligibility checker to find out in under 60 seconds.
Check eligibilityWhen private diagnosis may make sense
Some patients choose private autism assessments if:
- NHS waiting lists are very long
- They need a diagnosis more quickly
- They want greater flexibility in appointment scheduling
However, private assessments involve direct costs and may not always integrate easily with NHS follow-up services.
Explore autism assessment providers
Find Care Compare helps patients explore NHS and private autism assessment providers. You can:
- Browse providers accepting Right to Choose referrals
- Compare waiting times and assessment formats
- Understand what each provider offers
Frequently asked questions
Sources
This article summarises publicly available information from:
Sources referenced include:
- NHS England — autism assessment guidance
- NICE CG128 — autism in adults guideline
- NICE CG170 — autism in under 19s guideline
- NHS England — Choice Framework
- National Autistic Society — autism diagnosis resources
- Department of Health and Social Care — autism strategy
Related guides
Autism Right to Choose explained
How Right to Choose works for autism assessments in England, who's eligible, and how to request a referral.
Read guide GuideAutism diagnosis waiting times
Current NHS autism assessment waiting times across England.
Read guide GuideAdult autism assessment in the UK
What to expect from an adult autism assessment in the UK.
Read guide GuideChild autism assessment in the UK
How child autism assessments work in the UK, including referral pathways and waiting times.
Read guide