We built ours from scratch. 30x50 barn with 4 stalls, feed room, tack room, grooming area, and hay storage area. 7x50 overhangs on both long sides for loafing/shade and shelter from the weather. All stalls have dutch doors and we have split 10' sliders on the 30' ends, plus a 10' slider on one long wall for ease of unloading hay and feed and external personnel door into tack room. Cement floors in tack, feed and grooming area plus patio outside tack room door for viewing arena. EquiTerr flooring in stalls. Priefert stalls.
It cost ~$20K to build in 2005 just for the barn before cement and finishing stalls/feed/tack rooms. We were quoted $~30 K without all the dutch doors and extra sliders and windows in feed/tack rooms. Hubby said he could build me what I wanted if we did it ourselves, for the price we had in mind. We saved enough to buy him a front loader for his tractor.
Cement, Priefert, EquiTerr, flooring, lumber, etc. for finishing was probably another $5K.