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Your country might have its own standards.

Walk around your city and observe where Braille is used, like the above link pints out, “People who are blind or visually impaired benefit from braille signs that are placed in convenient and predictable locations.”

This is one of the reasons I think Braille is impractical and refuse to learn it. If you blanket every wall in Braille and I don't know it's there, you haven't helped me at all.

Blind people generally can manage stairs by themselves, but sometimes the underlying cause of our blindness causes other physical problems and we're in wheelchairs. I hope your client realizes blind people in wheelchairs are a small subset of the blind community and not the norm. Chances are good your client will go years between seeing a blind customer in a wheelchair.

But let's get to the specifics of your question. Some people need assistance navigating stairs, and some of the people who do will be blind. How can they know to ring the bell?

Well, how do they know they need to go to the next floor? Either they're regular customers who already know what's on the next floor, or someone told them the next floor is where they can find what they're looking for.

Regular customers already know about the stairs and the bell - if they couldn't ring the bell or navigate the stairs by themselves they wouldn't be regular customers.

And finally we arrive: what about the new, blind customer in a wheelchair who doesn't know there's a bell to ring but somehow knows the second floor has what he's after?

Your client's blind customer isn't stoopid. He will ask for assistance if he needs it, and if he doesn't know there's a bell to ring he will ask for assistance the old fashioned way, using words.

Yeah, your client might be surprised, but we can talk!

Wait, unless we're blind, deaf, and in a wheelchair, yet somehow shopping by ourselves. In that case, signage in Braille is probably the least of our concerns.

I think all signs should have braille on them because I have the right to read it if I want to read it. Also, I recognize that this is very impractical and will never happen.

I am more than capable of walking up the stairs by myself and usually will do it unless I am lost then I’ll ask for help but I am kind of independent and stubborn like that.

I would say ideally every sign has braille on it, and the fact that so many signs don’t have braille I assume this one does not but if it does I would be more than pleased and delighted.

I am in the tech industry so I try to find technological solutions too.

Does your client have a website, part of it is also putting it on the website as well that if they need assistance there is a bell at the stairs or in the lobby and if you need help don’t hesitate to ring it. Or please give us a call at xxxxxxxxx number.

But the braille signage would be interesting and useful.

Is there a way. To redo the flooring so there would be say tactile feedback?

So most of us who take orientation and mobility classes are taught about Braille guidelines for public buildings and warned about types of buildings that have it and that don’t have to follow it.
Unfortunately since it’s usually sighted people making and applying them though there are many errors and inconsistencies so it’s just easier to flag someone down to help.
If you *really* want a service bell for someone to come assist maybe a motion activated sound box programmed to say “please ring bell here for assistance” or something next to the bell itself? That doesn’t account for the blind and deaf community but the odds of people with additional struggles not bringing their own aid is pretty low.
Most of us learn a routine and try to stick to it or bring someone to help us.