It's classed as a disability so that comes with an entitlement to disability benefits including PIP.
https://www.benefitsandwork.co.uk/news/claiming-pip-for-adults-with-add-adhd
Here's some highlights:
"One of the most visited threads on the Benefits and Work forum is a six year old one about claiming PIP for adults with Attention Deficit Hyperactivity Disorder (ADHD)'
"In total, there are 37,784 PIP claimants with ADD/ADHD listed as their main disabling condition according to the DWP’s own statistics"
"The average success rate for all assessed claims for PIP is 53%.
For ADD/ADHD the success rate is 49%.
So, a little bit lower than average, but still almost half of all claimants with ADD/ADHD get an award."
"Almost everyone who gets PIP for ADD/ADHD gets an award of the daily living component and two thirds get an award of the mobility component.
34% get the enhanced rates of both components.
Enhanced daily living 26,699 (71%)
Standard daily living 10,200 (27%)
Enhanced mobility 14,030 (37%)
Standard mobility 11,502 (31%)"
And here's some tips on how to get awarded PIP for ADHD:
"There are no statistics which show which activities and descriptors PIP claimants with ADD/ADHD scored points for.
But, because PIP is awarded not because of your condition, but because of the way it affects your daily living and mobility then every claim will be different in any case.
The best way to establish whether you might be eligible for PIP on the basis of ADD/ADHD is to look through this list of PIP activities and think about the ways that your condition affects your ability to carry them out.
Preparing food
Taking nutrition
Managing therapy or monitoring a health condition
Washing and bathing
Managing toilet needs or incontinence
Dressing and undressing
Communicating verbally
Reading and understanding signs, symbols and words
Engaging with other people face-to-face
Making budgeting decisions
Planning and following journeys
Moving around
Remember that you need to be able to complete the activities
to a reasonable standard,
safely,
repeatedly
no more than twice as long as it would take a person without a health condition.
Below are some examples of the issues that you might have.
Being easily distracted, a tendency to procrastinate and difficulties with organizing tasks may cause problems in relation to preparing food, washing and bathing and dressing and undressing. Tasks may not get started, you may start but not complete them or they may take you more than twice as long as people without a health condition.
A tendency to hyperfocus may affect activities like taking nutrition, if you become so engrossed in things that you forget to eat.
Forgetfulness and disorganization may cause problems with managing medication or therapy.
Being impulsive may make budgeting a real problem.
Engaging with other people may be a challenge because of difficulties with turn taking, maintaining concentration and keeping to a topic during conversations.
Planning and following journeys may be challenging because of impulsivity, poor concentration and anxiety"