Recognising and acting on possible ADHD in your child can make an enormous difference to their educational experience, their relationships, and their sense of self. Yet many parents find the path to a child ADHD diagnosis in the UK frustratingly unclear — uncertain whether to approach the school or the GP first, unsure whether CAMHS or a private paediatrician is the right route, and daunted by the costs and waiting times involved. This guide explains every available pathway clearly so that you can make the right choice for your child.
Key Takeaways
- ADHD in girls is frequently missed — inattentive presentation is less visible than hyperactive-impulsive
- NHS CAMHS is free but waits are 12–36 months in most of England
- Private child ADHD assessment costs £900–£1,800 and typically takes 2–8 weeks
- An ADHD diagnosis enables EHCP application, exam access arrangements, and school support
Signs of ADHD in Children and Teenagers
ADHD in children manifests across three presentations — predominantly inattentive, predominantly hyperactive-impulsive, and combined — and the picture can look very different depending on the child's age, sex, and environment. The stereotypical image of ADHD in childhood is the hyperactive, disruptive boy who cannot sit still. While this presentation exists, it represents only one part of the spectrum, and it is the inattentive presentation — particularly common in girls — that is most frequently missed at school and by GPs.
Signs of the hyperactive-impulsive presentation in children include: constant movement, fidgeting or squirming, running or climbing in inappropriate situations, excessive talking, interrupting others, difficulty taking turns, and acting without thinking about consequences. Signs of the inattentive presentation are often subtler: forgetting homework, losing belongings, struggling to follow multi-step instructions, appearing to daydream, and starting tasks but not finishing them.
In teenagers, ADHD often presents differently again. Hyperactivity may have reduced (or been internalised as restlessness), while inattention, disorganisation, and emotional dysregulation become more prominent. GCSE and A-Level study are common trigger points for referral.
NHS CAMHS: The Free Route (and the Long Wait)
The standard NHS route for children's ADHD assessment is referral to CAMHS — Child and Adolescent Mental Health Services. Your child can be referred either by your GP or by their school's SENCO (Special Educational Needs Coordinator). CAMHS assessments are free and, once completed, include access to the full range of NHS treatment options including medication, parent support programmes, and school liaison services.
The critical problem with CAMHS is waiting times. Average CAMHS waiting times for a first appointment in England range from 12 to 24 months, with some areas reporting waits of 3+ years for a completed ADHD assessment. For children struggling at school right now, these waits can have serious consequences for educational attainment, social development, and mental health.
Private ADHD Assessment for Children — Costs and Clinics
Private ADHD assessment for children in the UK is generally more expensive than adult assessment, typically ranging from £900 to £1,800 for a comprehensive evaluation. The higher cost reflects the greater clinical complexity of paediatric ADHD assessment: multiple informants are required (parents, teachers, sometimes other carers), the assessment battery includes more tools, and the assessor is usually a consultant child and adolescent psychiatrist or a clinical psychologist with specialist paediatric experience.
NHS Right to Choose may also apply to children's assessments in some areas, though availability is more limited than for adults. It is worth specifically asking your GP whether Right to Choose is available for child ADHD referrals in your area.
What Happens After a Child's ADHD Diagnosis?
A formal ADHD diagnosis opens several important doors for your child. The most immediately practical is school support. Under the SEND (Special Educational Needs and Disabilities) framework, an ADHD diagnosis qualifies as a special educational need. Your child's school is required to make reasonable adjustments and should have an EHCP (Education, Health and Care Plan) assessment considered for children with significant needs.
Medication is an important part of treatment for many children with moderate-to-severe ADHD. NICE guidelines recommend medication as part of a multimodal treatment package for school-age children with moderate-to-severe ADHD, typically methylphenidate as the first choice.
Beyond medication, evidence-based non-medication interventions include parent-mediated interventions (such as ADHD-specific parent training programmes, recommended by NICE for all children), teacher training and classroom strategies, and for older children, CBT-based interventions targeting organisation, time management, and emotional regulation.
Frequently Asked Questions
Can a school refer my child for an ADHD assessment?
A school SENCO can refer to CAMHS, and their observations and reports are valuable supporting evidence. However, a GP referral is usually required for both NHS and private assessment pathways. The school and GP can work together.
At what age can children be diagnosed with ADHD?
ADHD can be diagnosed from age 4–5, though diagnosis in pre-schoolers is relatively rare and requires careful clinical assessment. The majority of childhood diagnoses occur between ages 6 and 12, when school demands make the impairment most visible.
Will my child need to take medication if diagnosed with ADHD?
Not necessarily. For mild ADHD, behaviour management strategies, school support, and parent training may be sufficient. Medication is recommended by NICE for moderate-to-severe ADHD in school-age children, but it is always a joint decision between parents, the child (where appropriate), and the clinical team.