I admitting that I didn't think this thru.

One day I was reading that laundromat business is going down because more people want to have washer and dryer in the unit. It is relatively easy to do if apartment is big enough, but if it is a tiny one bedroom or a studio apartment with no space in a kitchen or a bathroom?

For a while I was searching internet for the ideas. I found small under sink washing machines with shallow sink on top, wall mounted washers to wash one set of clothes, dryer combined with hand dryer.

The ideas are cute, but I am not sure good for rentals.

Some of installations was undercounter or inside a closet.

My imagination combined this two and I was thinking about a shallow cabinet or an opening in a bathroom, throughout a wall and to a adjacent room or closet, if possible. This design will make a little shelf in another room, but allowed to use width of the wall.

Now I need to figure out how to do pluming and exhaust for this and what to use to make a back wall to be as slim as possible.

Any ideas from RV, yacht or tiny house movement?

"Someone will want to pay more for the same apartment if it will be washer an dryer in the unit"

I would be leery of using any machines that any potential parts & service might be difficult to obtain. Just make sure that you don't end up paying dearly for just the possibility of getting slightly higher rents.

They do make front load washers that are a few inches smaller, their capacity is only 2 - 2.5 cu ft. They cost around $800 which is about the same price you can get a 4 cu ft one. They also make a combo washer and dryer but very expensive and not energy efficient. This is not the stack, but one unit. There are also portable washers, but I would not trust the tenant to hook it up to sink and not get water all over. Try looking at the website compactappliance.

I never want my tenants, especially the ones upstairs to have a washing machine, too many things can go wrong and it can flood that and a lower unit causing $5,000 damage.

One tenant of mine purchased their own portable dishwasher. When a guest was staying over they ran a load. They hooked up the washing machine to the kitchen faucet spout BUT Didn't run the disposal to clear the drain line. They also left dishes in the sink. When the washing machine drained, the water couldn't go down the drain so it spilled over the kitchen sink onto the floor -- then ran down into the downstairs apartment. Costing me $5,000 in damages.

Since a guest did the damage and not my tenants, and my tenants didn't have permission to have a portable washing machine and they cancelled their renters insurance, I lost in small claims court. Judge said poor low income tenants raising a family are not responsible for these type of issues. A landlord must keep on top of things and deal quickly.

One unit washer/dryer is not working good for the dryer part. It needs to be two separate units with permanent connections.