I have just such a porch on my house!
It’s not original to this 135yr old cottage, as the transom window was discovered fully intact beneath the dry wall. Almost all the houses on my street have porches, some larger and grander. But ours is the only enclosed one.
We love it and get tons of use out of it. During really spectacular weather, summer or winter, it’s amazing to sit and watch it. The neighbours come out and watch for a moment only to retreat indoors quickly. I take my tea and cuddle up with my dog and watch the snow pile up or the rain pour down. It’s awesome.
We don’t use it as a mud room, to BBQ, or for coats, instead I’ve converted into a sort of library with a long shelf running the entire length of the porch, above door and windows. It holds a lot of books, plus there is additional book shelving below the windows as well. (Pretty sure all the books add insulation during the cold, cold winter!) A deacon style bench where you come in and a high window seat, to lay on, at the other end. It also holds my rock collections, deer antler and various artifacts of our travels.
Brought a lovely hammock back from Cambodia, kept under the seat of the bench, and with the mounts in place so it’s a breeze to hook up and take down. I spend time in it most every afternoon!
We get a lot of use from the porch, even in winter as we have a heated throw. In the autumn I can extend the flowering of my summer pots by several weeks by bringing them into my porch, which is wonderful. In the fading winter, the sunshine creates enough solar gain to make it warm enough for hammocking by late afternoon. A lifesaver when you’re bone tired of winters chill! Warm enough to add heat to the house even though there is still snow on the ground.
It was unused space, no shelves or seats, of little utility when we bought the house. But now it sees lots of use and is one of our favourite spaces. Every day when my hubby gets home, after dropping his gear, he heads to the window seat with our dog. Just to relax and chill, watch the world go by, enjoy the view and shake off that work feeling. I get in the hammock and we chatter while watching the the neighbour kids play. Pretty sure that’s how porches have always been used, and ours still is, almost daily, - even though it’s enclosed!