/diy/ - Do It Yourself

Hello /diy/ ers. I come to you with a slight problem, hopefully I can get some help.

My mother-in-law recently had a brain tumor removed....she is now permanently disabled. As such, we are having to move into her house to care for her. The problem is that she has a 3 bedroom house, and there will be 5 people living there. (She also has a disabled son).

My plan is to enclose her porch and make it into an extra bedroom. Honestly, this doesn't have to be fancy...or even permanent. She will most likely live another 2-5 years at best...she knows this, and just wants to be at home, doesn't really care how that happens.

While I am a pretty handy guy, I feel this may be slightly beyond me...however, due to financial constraints, I will have to do the work and pay for materials myself. My budget is about $1500 - $2000.

I only need to enclose two sides (the other two are the house and a built in tool shed that can be converted to a closet.

Where should I start?