How Long Is the Autism Assessment Wait in the UK Right Now?
If you’ve recently been referred for an autism assessment, or you’re still trying to work out whether to ask for one, you’ve probably already heard some version of the same warning: it’s a long wait. What’s harder to find is a straight answer about how long, why, and what you’re actually supposed to do in the meantime. This article sets out the current figures, where they come from, and the practical steps worth taking while you’re on the list.
The Current Numbers
According to NHS England’s most recent published data, covering the year to March 2026, there were 270,701 people in England with an open referral for suspected autism. Of those, 242,708 — just under 90% — had been waiting 13 weeks or longer. That 13-week figure matters because it’s the maximum wait recommended by the National Institute for Health and Care Excellence (NICE) for a first care contact after referral. In practice, for the overwhelming majority of people on the list, that recommendation is not being met.
The same data shows the scale moving in month-by-month snapshots: just over 12,700 new referrals and around 13,150 referrals closed in March 2026 alone. Closed doesn’t necessarily mean assessed and diagnosed — referrals can close for several reasons, including the person being assessed, moving away, or withdrawing. The headline total of open referrals is best read as a rolling backlog rather than a queue that empties out at a predictable rate.
How the List Grew This Large
This isn’t a new problem, but it has grown quickly. Autism charities and health analysts, including the Nuffield Trust, have tracked a sustained rise in referrals over the past several years — driven by a mix of greater public and professional awareness of autism, wider recognition of how it presents in girls and adults, and referral pathways that are, in many areas, simply not resourced for the volume of demand now reaching them.
Commentary from the National Autistic Society has repeatedly pointed to funding and workforce capacity as the core constraint, rather than a lack of clinical guidance — NHS England has published an Autism Assessment Framework setting out how services should operate, but Integrated Care Boards in many regions report they don’t have the staffing to deliver it within the recommended timescale.
Why Waiting Times Vary So Much by Area
Autism assessment isn’t commissioned nationally in a single, uniform way. It’s delivered through a patchwork of NHS trusts, Child and Adolescent Mental Health Services (CAMHS), and community paediatric services, each commissioned locally by a different Integrated Care Board. That’s why two families a short distance apart can face very different waits — the referral pathway, the assessing team, and the local backlog are all different, even though the national guidance is the same.
Some areas also offer a Right to Choose route, which allows a GP to refer a patient to a qualified independent provider for assessment under the NHS, sometimes with a shorter wait than the default local pathway. Availability varies by area and can change with little notice, so it’s worth asking your GP directly whether it applies where you live, rather than assuming either way.
You Don’t Have to Wait for a Diagnosis to Start Helping Your Child
This is the part that gets lost in most articles about waiting times: a diagnosis is not a prerequisite for support. NICE guidance supports involving parents and carers directly in psychosocial interventions for autistic children, and that guidance is written around a child’s needs and presentation — not around whether a diagnostic label has been formally issued yet.
Behaviour-analytic approaches, including Applied Behaviour Analysis (ABA), work from a functional assessment of what’s actually happening for your child day to day: what triggers a meltdown, what a behaviour is achieving for them, where communication is breaking down. None of that requires a diagnosis to begin. Many families find that starting this kind of support during the wait — rather than after it — means they arrive at the eventual NHS assessment with a much clearer, evidenced picture of their child’s needs.
Practical Steps to Take While You’re on the List
- Get your name on the list as soon as you have any concern — don’t wait for certainty. Referrals can always be updated with more information later, but the clock on your place in the queue starts when the referral is made.
- Keep a simple written record of behaviours, triggers and what helps. Note roughly when and where difficulties happen, and what was going on beforehand. This becomes genuinely useful evidence, both for the eventual assessment and for any school or EHCP process running in parallel.
- Ask your GP directly whether a Right to Choose provider is available in your area, and what the current wait looks like through that route compared with the standard local pathway.
- Contact your local authority’s SEND team even without a diagnosis. Educational support, EHC needs assessments and school-based adjustments are based on a child’s identified needs, not on a formal diagnostic label.
- Consider starting behavioural or developmental support now. A structured assessment from a qualified behaviour analyst can identify what’s driving the difficulties you’re seeing and give you a working plan, independent of where you are on the NHS list.
- Loop in your child’s nursery or school early. Consistency between home and any group setting makes a measurable difference, and staff often welcome specialist input while a family is waiting.
Where This Fits With What We Do
We’re a home-based ABA therapy provider working with families across the UK, and a large proportion of the families we support are still waiting on an NHS assessment when they start with us. Our own assessment process maps a child’s current skills and identifies what’s driving the behaviour a family is concerned about, and from there we build a programme delivered in the home — without needing to wait for a diagnostic letter first.
If you’re on a waiting list and wondering what, if anything, you can do in the meantime, that’s a conversation worth having early rather than late.
Sources: NHS England, Autism Statistics (April 2025 to March 2026), published 14 May 2026; National Institute for Health and Care Excellence (NICE) guidance on autism spectrum disorder in under 19s; National Autistic Society public commentary on autism assessment waiting times; Nuffield Trust analysis on autism and ADHD assessment waiting lists.
