It would be interesting if those writing in who worked from home truly went for the standards that are in place for unisex toilets in offices and public places. The loos have to be capable of being opened from the outside quickly and the door hinges capable of being reversed so you could open the door outwards. There would need to be minimum width dimensions, a standard height toilet bowl, fire alarms - ideally visual as well as audible, hooks, washable walls, doors resistant to sound, sanitary bins etc. They need a hand dryer - a blower or paper towels and a separate bin for that. They ideally have to lead out onto main circulation space too, like a hallway. High quality CCTV outside the toilet room sometimes retrospectively shows the lurkers faces and who’s been in and out for misuse (sex, drugs, hiding cameras) so you can catch them. Obviously ventilation rates have to be considered and some sort of mechanical ventilation is second best if natural can not be achieved.
A public toilet may only last a few hours before it’s vandalised though. Estimates put the cost of running a council public toilet at 15k per year. And if they really go for it on safety recommendations, clear bin bags within toilet rooms are used in high-risk terrorist locations.
If they had an incident in the toilet room whilst at work, they couldn’t sue themselves for not being up to standard. Perhaps they could have a radar key fitted? That was an attempt to stop misuse in the original mixed sex private toilets (the disabled). However you can buy one for a couple of quid on the internet so bare that in mind.
Home toilets aren’t upto the health and safety standards of public toilets.