How long is the wait for an NHS autism assessment?

It depends heavily on where you live and your age. NHS England's guidance says a first appointment should follow within 13 weeks of a referral, but the published waiting-list figures show most people waiting far longer than that.

Why have autism waits grown so much?

Referrals have risen sharply as recognition has improved — the number of people on the waiting list is now roughly thirteen times what it was in 2019 — while assessment capacity has not grown at the same pace.

In England you can apply the Right to Choose route to autism assessments, provided the clinic holds an autism Right to Choose contract — waits there are sometimes shorter. Paying privately is usually faster still.

Do I need a diagnosis to get support?

Not always. Workplaces and schools can make reasonable adjustments based on the difficulties you describe, and many do so before any diagnosis is confirmed.

Is there anything that will treat autism while I wait?

Autism is not an illness and there is nothing to cure. What helps is adjustments, understanding and support — and treating any co-occurring condition such as anxiety or depression in its own right.

Autism

5 min read

Autism assessment waiting times in the UK

Written and reviewed by Dr Chris Smith · Last reviewed 22 September 2026

If you are waiting for an autism assessment and it feels as though nothing is moving, you are not imagining it. The published NHS figures show more than 200,000 people with an open referral for an autism assessment in England — roughly thirteen times as many as in 2019. This guide explains what those numbers mean, what the official standard is, and what you can actually do.

What the national picture shows

More than 200,000 people in England have an open referral waiting for an autism assessment.
That is around thirteen times the number waiting in 2019 — the steepest rise in any NHS diagnostic queue of its kind.
NHS England's standard is a first appointment within 13 weeks of referral. The published figures show the large majority of people waiting longer.
Waits vary enormously by area and by age group, so a national figure tells you the shape of the problem, not your own wait.

All of the above comes from NHS England's published autism statistics, linked in the sources below. We do not estimate.

Why the queue has grown

Recognition has improved a great deal — particularly of autistic adults, and of women and girls whose presentation was historically missed. More people are being referred, and rightly so. Assessment capacity, which depends on a limited pool of trained clinicians, has not grown at anything like the same rate. The gap between the two is the waiting list.

What you can do

Ask where you are in the queue. Your local service should be able to give you an indication, in writing.
Consider Right to Choose in England. It can apply to autism assessments — check the provider holds an autism Right to Choose contract first. See our autism Right to Choose guide.
Compare private waits. Our live autism waits and costs page shows what each listed provider publishes, and our cost guide shows the price range.
Ask for adjustments now. Workplaces and schools can respond to the difficulties you describe without waiting for a diagnosis.
Get co-occurring conditions treated. Anxiety, depression and sleep problems are treatable in their own right and should not be parked behind an autism assessment.

A word on what to avoid

Long waits attract people selling answers. Autism is not an illness and cannot be cured, so nothing on offer will "treat" it. NICE CG170 advises against secretin, chelation and hyperbaric oxygen therapy in any context; against neurofeedback and auditory integration training for speech and language; and against antipsychotics, antidepressants or exclusion diets for the core features of autism. The National Autistic Society is a reliable place to check anything you are unsure about.

Common questions

How long is the wait for an NHS autism assessment?: It depends heavily on where you live and your age. NHS England's guidance says a first appointment should follow within 13 weeks of a referral, but the published waiting-list figures show most people waiting far longer than that.
Why have autism waits grown so much?: Referrals have risen sharply as recognition has improved — the number of people on the waiting list is now roughly thirteen times what it was in 2019 — while assessment capacity has not grown at the same pace.
Can I speed it up?: In England you can apply the Right to Choose route to autism assessments, provided the clinic holds an autism Right to Choose contract — waits there are sometimes shorter. Paying privately is usually faster still.
Do I need a diagnosis to get support?: Not always. Workplaces and schools can make reasonable adjustments based on the difficulties you describe, and many do so before any diagnosis is confirmed.
Is there anything that will treat autism while I wait?: Autism is not an illness and there is nothing to cure. What helps is adjustments, understanding and support — and treating any co-occurring condition such as anxiety or depression in its own right.

Sources

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