The Danish regulations concerning the layout of stalls and stables for horses requires that the area of the stall is at least the square of the double height of the horse, the shortest side has to be at least 1.7 times the height of the horse. Our stalls are all the same size: 3.5m x 3.5 m, so it is legal accommodation for a horse of up to 1.75 m.
In addition to the area requirements, there are an enormous number of other regulations regarding the height of the interior of the stable, how much volume of air per horse, how much natural light to come from windows and so on.. But since we rebuilt the stable two years ago, it complies with those regulations.
The stalls are made by inserting boards between the posts that form the outer edges of the stall.
Some 2x4" larch were sawn to length (125 cm), and then they were ripped on the tablesaw.
All the children including one playmate were "forced" to participate for 1 hour.
We didn't get to do much actual building, but we cleaned the area and started on making the holders for the boards.
Some of the boards only need to be 85 cm long, so I can use some of the twisted and ugly larch that is unsuitable for anything else. For this stall I plan to use boards of 5/4" thickness. The rest of the stalls have got normal 1" thick boards.
Previously it was common to make the upper board for a stable out of elm, since horses and pigs don't like to bite in it, presumably it doesn't taste very good. The existing stalls have boards made out of either larch or Sitka spruce. They have been painted with something called "bite stop", so it hasn't been a problem with the horses destroying the wood.
Please note that I do like horses and do enjoy riding myself once in a while.
Gustav (10) crosscutting a 2x4
Some fairly twisted larch
The boards inserted between two holders.
The future source of hide glue