Quite large but my cat loves it!  Easy to assemble.  I would suggest markoff the overall size on the floor to see if it is the right size for you .  I have a 23x13 living room so the size is perfect.  The first night Mittens just walked around it.  I sprinkled catnip on the perches and in the houses and now she is all over it.  My cat is 18# but there is no movement -- very sturdy.