She should conform to you and your working practices, you lost a lot if ground here... get some round ones and stand up for yourselves.

As for starting off on the "wrong foot" she did that with her crazy demands.

One way to make up any lost ground is to tell management and HR "We tried to do things her way, and it is just not working for us. We need to get back to a normal office environment, NOW."

Speak up! She's not simply being unreasonable, but utterly weird and anti-social.

If this is true it is ridiculous. Working requires communication. Spoken communication is quick

This is actually pretty normal if you are you a large green chap who charges toll at bridges and your new colleague is a vampire.

You're presenting this as if you are all equal coworkers. Who's the boss? What do they think about this? Have they been given a chance to solve this issue?

Door locked sounds like a fire hazard, and is probably not legal.

You need to figure out why the new colleague wants that..... If it's a "I don't like noise".... noise cancelling headphones will be a wonderful thing for her. The door being locked likely comes from something she's worried about. You can aleviate that.... tl;dr: don't give in to the crazy demands... but they come from somewhere. Figure out what somewhere this is, and then fix THAT

@Patrice: Unless they've improved dramatically, noise-cancelling headphones (at least the ones I've tried) don't seem to do much for speech.

You and your coworkers need to take this to your boss at once. These requirements are way over-the-top, impact you and your co-workers productivity, and are a potential safety hazard. Maybe she's angling for a private office - or, maybe she's just a head case. Either way, your boss needs to get her and her demands under control.

Does your office space have a broom closet ? (humour)

Hang on. I was with you until almost to the end but if you fear the “look” of two people emerging from a closed room (and I do know what you mean), how do you go about having one on one meetings?

@jamesqf Is you listen to music they drown out voices almost perfectly. If you use them without music… not so much.

As a comment replying to those above, these requirements sound common for many neurological (mental health) disabilities. They aren't usually seen in the workplace because people aren't usually able to say what they need, but they are not unusual at home when working. So the issue is in part that culturally, disabled people needing these or similar environments to work well, are scared to ask for them. They aren't actually unusual or extreme adaptations in themselves, they just aren't seen often at work because people get scared to ask for what they need.

Does your manager also work in the room and accepts the conditions? If not, simply refuse to comply with this nonsense until you have a formal request, in writing, from somebody in authority. (And if you get the written instructions, take them to a lawyer to start proceedings against the company!)

@KonradRudolph Even 1:1 meetings are typically held with the lights on. Most workplaces I've been in had windows in the meeting room doors, etc. as well. Not least because you can see if the room is already occupied before opening the door.

Her rules are a healthy reaction to the usual hell of open plan offices.

@Patrice It seems unlikely that someone who wants to impose unreasonable restrictions on others would take kindly to being told to buy, wear, and use headphones.

No one can speak to her. Communication needs to be done over email only. Was the interview done over email only?

@PeterMortensen I laughed, but that's a really good point and severely undercuts any ADA claim.

@GalacticCowboy I'm not sure why you're bringing up the light. I was specifically talking about closed doors during meetings.

"So far I and my co-workers have [...] should I/we go about ..." - Do your two pre-existing coworkers share your grievances, or are they less bothered by the situation?