Another solution I have seen is to build a new wall outside the current one as illustrated in photo accompanying this article. Often the posts on which the stall dividers are hung can be left in place and the wall between the posts is removed. Cows now have lunge room in the space created by a new wall two feet out from the old.
There are several variations of this plan depending on the current structure. If the old posts are sound structurally, then the new posts do not need to bear the roof load and can be spaced further apart. They will bear only the short roof extension. Alternatively, the new wall could bear the weight of the roof and the old posts cut off above the stalls.
Sometimes, the new wall is also the opportunity to hang a curtain sidewall that will improve ventilation in the barn, as well as stall comfort.
Producers who have added the new wall and thus extended their stalls have reported cows respond well to the added stall length with increased use and improved performance.
It is easy for producers to take things for granted and assume their barn is providing adequate cow comfort. However, the behavior of the cows will tell the truth if we are willing to listen. If cows are not properly using stalls they are telling you it is time to re-evaluate stall comfort and take your tape measure out to the barn. Penn State University has stall designs and dimensions that can be a useful tool in creating a stall comfort redesign on your farm.