hen house

I have 7 in an area of 6 x 12 (72 sq ft) which is a little bigger than yours which will be 64 sq ft.  They are let out to freerange as well but seem really happy with the room they have.   

the run space is not very big at all - The very minimum of clear run space (so excluding the coop and the area where you have the feeders and drinkers) of 1 square metres per bird and ideally you should allow 3 square metres per bird if they are in it all the time.