Hello. I too house my piggies in a shed where they live free range.
I have two small hutches at either end that I layer with newspaper and fill with hay. They then come and go as they please and roam around the floor.
I have covered my floor with Lino, I then cover this with lots of newspaper, scatter woodshavings over and then cover the whole lot with hay.
My shed has windows that do not open but let light in but it has a stable door so I can leave the top door open covered in mesh on nice days during the summer.
My hubby used the door from the old hutch and secured this to the bottom of the bottom door to stop the piggies from getting out when I open the door fully although they tend to know that's their home and don't attempt to come out unless I bring them out.
They also have lots of fleecy beds and tunnels etc that I scatter around the floor.