What a Screen Porch Really Is (Hint: It's Not a Deck With Mesh)

It Starts as a Roof and a Foundation, Not a Deck

People ask us for a screen porch and picture the screening first: mesh panels between posts on an existing deck. That's backwards from how it actually gets built. A real screen porch is a small building. It needs footings dug below the frost line so the structure doesn't heave every winter, framing sized to carry a real roof load, and a roof tied into the house correctly, not just an awning bolted to the siding. The screens are the last thing that goes on, not the first thing that gets decided.

Before any of that starts, it's worth a call to your local building office to ask what applies to a project like this on your specific lot, since requirements differ from one township to the next. We'll help you through the process, but we'd rather you hear the answer from the office that actually issues the paperwork than have us guess at it for you.

The Holbrook Porch, Start to Finish

One of the jobs we're proudest of started as a low, tired deck on a yellow-sided ranch house here in White Heath: worn boards, no roof over it, nothing you'd want to sit out on during a rainstorm or a hot afternoon. Here's roughly how that project actually went.

• The old deck came off down to bare ground, so we could see what the existing footings actually looked like.
• New footings went in below the frost line, and new posts and framing went up sized for a real roof, not just a floor.
• The roof structure tied into the house with proper ledger flashing, so water sheds away from the wall instead of into it.
• The floor went down last, over the completed frame, ready for the screen panels and railing.
• Railing and steps finished it off, built to match the house rather than look like an add-on.

What used to be an unused deck is now a screened porch with a real gable roof, a floor you can put furniture on, and railing and steps that look like they were part of the house from the start, because structurally, now they are. The screen panels themselves went in last, framed tight against the new posts so there's no gap for insects to work through at the corners, which is the detail that separates a screen porch that actually keeps bugs out from one that just looks like it should.

Sunrooms, Decks, and What Holds Them Up

The same rules apply whether you want a full screen porch, a sunroom, or a straightforward deck. Footings have to go below the frost line or the structure will move with the ground every year, which shows up eventually as a step that's suddenly not level anymore, or a railing post that's worked loose. A ledger board bolted to the house needs its own flashing so it doesn't become the one place your siding traps water against the framing. A deck without a roof is a simpler build than a porch, but the footing and framing decisions underneath it are the same conversation, not a shortcut version of it.

A sunroom sits somewhere between the two. It gets a real foundation and a real roof like a screen porch does, but with glazed walls instead of screens, and depending on how it's built, it can be conditioned space you use year round rather than a three-season room. The decision between a screen porch and a sunroom usually comes down to how you actually plan to use the space: an evening spot to sit outside without the bugs, or a room you want heated and cooled like the rest of the house. Either way, the foundation work underneath doesn't change.

We handle new home construction, additions, sunrooms, screen porches and decks, along with the electrical and plumbing work that often comes with them, all backed by a one-year labor guarantee on new construction labor. A free estimate is the first step, and it costs nothing to have us walk your yard, look at what's already there, and tell you honestly what a porch like the Holbrook job would actually take on your own house.