There's a British Standard for designing buildings around how brains actually work. Almost nobody has read it.

It's called PAS 6463, it came out in October 2022 - and it's the first national building design standard written around neurodivergent people.

I'm autistic and I have ADHD. So when I say most buildings assume everybody filters noise, light and information the same way - I'm not reporting that secondhand.

I'll say what it covers, what the three principles actually mean on a site visit, and why it matters that a document like this exists at all.

Who it's for, and the number people get wrong

ACAS puts the neurodivergent share of the population at 15 to 20 per cent, drawing on research from Birkbeck. Call it somewhere between one in five and one in seven.

I hear "isn't that a bit niche" fairly often. So here's the comparison I use. The NHS estimate for wheelchair users in the UK is about 1.2 million, which is roughly 2 per cent of the population, and there isn't even an official count. Nobody argues wheelchair access is too niche to bother with.

The neurodivergent population is something like eight times larger than that.

PAS 6463 covers autism, ADHD, dyslexia, dyspraxia, dyscalculia, Tourette's, dementia, acquired brain injury and mental health conditions. That's a wide group - and it's the point, because they don't all need the same things.

It doesn't replace anything. It fills a gap.

Part M is physical access. BS 8300 covers physical and sensory access, mostly mobility, vision and hearing.

PAS 6463 is about cognitive and sensory processing. How much work your building makes somebody's brain do before they can get on with why they came.

There's overlap, obviously. Lighting, acoustics and wayfinding show up in all of them, and Part T hands its lighting guidance straight to PAS 6463. But the other documents tell you what to install - and this one goes into why a particular choice matters to somebody whose sensory filtering works differently from yours.

That's also why it's a PAS rather than a British Standard proper. It's a publicly available specification, developed faster and with neurodivergent people involved. It carries less weight than BS 8300 - and it covers ground nothing else does.

Clarity, Control, Calm

The whole thing hangs off three principles. They sound soft until you start measuring against them.

Clarity

Can somebody understand, predict and navigate the place without effort they didn't budget for?

An unclear building is exhausting in a very specific way. You're running a background process the whole time. Where am I. Where am I meant to be. What's that noise. Why is that light doing that. What's expected of me here.

In practice that means layouts that go where you'd expect, signage that's obvious rather than complete, a consistent visual language so doors look like doors, and far less on the walls than most places have.

When I walk into a building that gets this right, I can spend my attention on the meeting. When I walk into one that doesn't, I arrive at the meeting already spent - and the building did that before anything had even started.

Control

Can people adjust the environment, or must they take what they're given?

This is the one most often missed - and it's missed because of an assumption. Designers look for the right setting. There isn't one.

I need low light and quiet. Somebody else who is also neurodivergent needs brighter light and some background noise. We're not disagreeing - we need opposite things, and any single fixed setting fails one of us.

So: dimmable lighting rather than one level. A quiet route as well as the busy one. Somewhere private as well as the open plan. Things you can opt into rather than things that happen to you.

Open-plan offices nearly ended my working life before I got adjustments. Same brain, same job. Give me control over noise and light and I'm productive. Take it away and I'm not. Control is dignity - and it's cheaper than almost anything else in this field.

Calm

Is there anywhere to recover?

Sensory and cognitive load accumulates through a day. If there's nowhere to discharge it, it keeps going up until something gives. A quiet room isn't a crisis facility. It's the thing that stops the crisis.

That means somewhere low-stimulation to pause, gentle transitions between zones rather than walking from a quiet corridor straight into a hard bright atrium, and some natural light and planting - which is better evidenced than it sounds.

What this looks like when I'm actually in the building

PAS 6463 is the reason the Cognitive column exists in my audits - and the reason I measure things other people don't.

Lighting gets checked for flicker. Not just level. A fluorescent tube or a cheap LED driver pulsing at a rate most people never consciously notice can give somebody a headache within twenty minutes - and nobody in the building will ever connect the two.

Acoustics get checked for what the room does to speech. Not how loud it is. A hard, reverberant foyer is a different problem from a noisy one - and needs a different fix.

Wayfinding gets checked for decision load. Not "is there a sign" but how many decisions somebody has to make between the front door and where they're going - and whether the building confirms they got it right.

And I look for whether there is anywhere at all to stop. Most buildings have nowhere between the entrance and the destination where a person can stand still without being in someone's way or looking like they're lost.

Why I think the document matters more than its contents

Here's the part I actually care about.

For a long time the answer to sensory and cognitive access was individual adjustment. You ask. Somebody decides whether you're being reasonable. You get a thing, or you don't, and either way you've had to explain your brain to a stranger to get it.

A published standard changes what the conversation is. It stops being about whether your particular request is reasonable and starts being about whether the building meets a specification. That's a much better conversation to be in - and it's one you can have before you arrive rather than at a reception desk with a queue behind you.

It also says something by existing. Somebody sat down and wrote a national design standard on the premise that brains vary and buildings should account for it. For a lot of people that's the first official acknowledgement they'll have seen that the problem was ever the room.

One honest caveat

PAS 6463 is a purchasable BSI document and I'm not going to reproduce it here. If you're specifying to it, buy it. What's above is what it's for and how I use it, not a substitute for the text.

It's also guidance, not law. Nobody is going to prosecute you for ignoring it. But the Equality Act duty to make reasonable adjustments is anticipatory, and once a published standard exists describing what good looks like for a sixth of the population, "we didn't know" gets harder to say with a straight face.