We have a new client coming onboard and this was a question during our pre-retainer discussion.
There are portable hand washing sinks available for about 2500-3500 each.
You'll need an electrical plug in at each location and there are two tanks located within the unit - one for fresh potable water and the other for waste (grey) water.
There is a built in heater unit to boost up the temperature for handwashing.
The handsfree units have a battery operated faucet so that when hands are placed under the faucet the water flow starts and stops when the person remove their hands.
Upside: avoiding substantial piping costs for a traditional sink.
Downside: Your employees will need to change out the tanks.
Thus, you'll need extra tanks for rapid change outs.
I observed two of these in a beverage company and found them to be quite the work horses.
It's the downside that bothers me, because the change outs will not always be on time then you have people not washing their hands and/or grey water overflowing.
I agree with SQFConsultant.
We had two of these in our facility along with regular handwashing stations throughout. We used these in places where it was harder to pipe additional plumbing. We had someone come around and check the tanks twice a day to remove the grey water and refill the clean water. They were hands free and pretty nice when they were functioning.
As mentioned, you do have to keep a constant eye on these units, so there were times when we couldn't use them.
All in all, it is a relatively inexpensive option to add additional sinks to your facility. However, when they aren't functioning, the lazy folks are going to be less inclined to go a bit further in distance to wash their hands.