All the furniture in Andrew's house are on wheels. Hmm ... certainly makes cleaning easier. For us, he gives the Tullsta Armchair mobility.
He say, "Basically, I remove the stick legs from the Tullsta and replace it with a wood 2x4 box and Rill casters to put the armchair on wheels. 95% of the stuff is Ikea, and can be bought currently. I've done this to 4 of my Tullsta chairs, and it's a real simple hack."
See more pictures and instructions for the Tullsta on wheels.