Is it possible to transform 2 identical single beds into bunk beds? Also is it safe to do?
Just get a good mattress and put it on the floor. Looks cool with some cushions on it, during day time use you can just stand it up against the wall, sit on the cushions and use the mattress like a sofa back. Cheap and cheer-full and gives you more space.
You would need to drill at minimum 1/2 inch holes (Centered) into the tops of the bed posts on one bed then into the bottom of the legs on the other. Glue wooden dowels or (iron or steel pins) into the holes connecting them together, Make certain the drill used is the correct size to ensure the dowels are a tight fit. Secure ALL other connection points with metal brackets and you should be good to go. Last thing you need is for the bed to come apart, so secure everything that connects together as though the bed came as one piece. If the beds have slats that support the box springs make sure to secure them too. Basically secure everything to ensure it stays together. If the head and foot boards are of different heights you'll need to cut them to uniform height. Safe is relative to how solid the beds are, so use good judgment before proceeding. BTW...I did it when my kids were younger and it worked perfectly. I worked roughly 10 years repairing furniture so that should count for something I hope.