Well, if one goes by zoning rules where I live that I’ve been recently investigating in my desire to have a shed workshop:
A porch under roof attached to a house is outside. If you enclose a porch it makes your house larger.
A porch under roof attached to a shed is apparently inside, which is to say that just having a porch at all counts towards the point that you have to use brick.
Not to mention if a screen makes it “inside” then your property taxes get raised. If it’s attached to a shed, then said shed is no longer taxed at shed rate but at the higher house rate. Face it, no matter what, you lose.