Enclose carport

6 months ago we started caring for our nephew and niece, we now have full custody. Our niece was only 3 days when she came here we had to pick her up from the hospital, her brother was 16 months old. We need another room added to our house, we  are wanting to close in our carport for our son and nephew. The room they are sharing now is super tiny and is good for one child but not the both of them. This would help us out so much and be such a blessing to our family. Going from 3 kids to 5 kids was hard at first but we are doing it and making the best out of life and trying to raise them up in a loving Christian home. These kids are our everything, they all mean so much to us blood or not. Ages of  all the kids...9,5 (6 in Dec),2 (3 in Dec), 20 months(nephew) and 4 months (niece)