Screened porch or sunroom: which fits a Greensboro house?

What is the difference between a screened porch and a sunroom?

A screened porch is an outdoor room with a roof and screen walls. It keeps rain off from above and insects out from the sides, but it is the same temperature as the yard. A three-season sunroom swaps the screens for glass or vinyl panels and blocks wind and some cold, but it is not heated or cooled with the house. A four-season room is a true addition: insulated walls and roof, real windows, and heating and cooling, so it can be used in January as easily as in May.

The three are often discussed as one choice, but they are different projects. A screened porch is mostly framing, roofing and screen work. A four-season room adds insulation, windows, electrical and HVAC, which is why its price sits in a different band and why it is permitted and built like any other addition.

How much does a screened porch cost compared with a sunroom?

HomeGuide publishes national figures for both. A new screened-in porch of about 200 square feet runs $10,000 to $35,000, or $50 to $175 per square foot, while screening in a porch that already has a roof costs $2,000 to $5,000. A three-season sunroom runs $8,000 to $50,000, and a four-season sunroom $20,000 to $80,000.

These are national averages rather than Greensboro prices, so use them for comparing the options, not for setting a budget. The per-square-foot column tells the real story. Even at the top of its range a screened porch costs less per square foot than the bottom of the four-season range, and the cheapest option of all is screening a covered porch you already have.

How does Greensboro's climate change the choice?

Greensboro has a humid subtropical climate. Under 1991-2020 normals at Piedmont Triad International Airport, the average July high is 88.5 degrees and the average January low is 30.1 degrees, with about 44 inches of precipitation and about 7 inches of snow a year. NC State Extension puts Guilford County's average last spring frost at April 1 and its average first fall frost at November 4.

Read together, those numbers describe a long, warm, wet outdoor season with a short cold stretch. A screened porch is comfortable for much of the year from spring into fall, and a ceiling fan carries it through most summer evenings. A three-season room stretches the shoulder months a little at each end. Only a four-season room is truly usable on a January night, and it is the only one of the three that has to be heated and cooled like the rest of the house.

Rain matters as much as temperature. A porch roof with gutters, and a pitch that sheds water away from the house, earns its keep in a city this wet. So does a floor that drains: screened porches see blowing rain, and the floor should be built to shrug it off.

Winter brings its own test. Cold-air damming can bring freezing rain to Greensboro, often a bigger winter concern here than snow, so a porch or sunroom roof needs to shed ice cleanly and its gutters need enough pitch to drain once it melts.

Why mosquitoes push so many Greensboro homeowners toward screens

Anyone who has sat on an open deck in Greensboro at dusk in July knows the problem. A Greensboro pest control company's blog devotes a full post to mosquito infestations in the city, and screened porches are a well-established project type around the Triad for that reason.

That is the practical case for screens. A deck is lovely on a dry October afternoon and miserable on a still summer evening. A screened porch keeps the outdoor feel, the breeze and the sound of rain, and takes the bugs out of the equation. It also tends to be the option that gets used every day, for coffee in the morning and dinner at night, rather than on a handful of perfect weekends.

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The details that make a porch room worth sitting in

Whichever option you pick, a handful of details decide whether the room gets used. Most of them have to be planned before the roof goes on, because they live in the ceiling, the floor or the walls.

Add these up and a screened porch starts to feel like a room rather than a covered deck, which is the whole point of building one.

• A ceiling fan, or two on a long porch, wired on its own switch.
• Lighting on a dimmer, plus outlets on at least two walls, all under an electrical permit.
• A ceiling finish such as painted tongue and groove that hides the framing and takes humidity.
• A floor chosen for the job: wood or composite decking that drains, or a sloped concrete slab.
• Pet-resistant screen on the lower panels if a dog will be pushing against it.
• A screen door with a closer that actually latches, so the room stays bug-free.

Starting from a deck you already have

Many screened porches start life as decks. HomeBlue's Greensboro deck figures put pressure-treated pine at $16 to $19 per square foot installed, cedar at $27 to $31 and composite at $32 to $33; for a 200 square foot deck, that works out to $3,200 to $3,800 in pressure-treated wood or $6,300 to $6,700 in composite. The 2025 Cost vs Value report prices its standard Greensboro wood deck addition at $15,878 and a composite deck at $22,803.

Screening an existing deck is not just a matter of adding posts and screen. The deck framing and footings were sized to carry people and furniture, not a roof, and the roof has to tie into the house without trapping water against it. North Carolina's residential code requires exterior footings at least 12 inches below undisturbed ground, and we check what is under the existing posts before planning a roof on top of them. Sometimes the deck is ready. Sometimes the right answer is new footings and new posts under the old deck.

Our deck building, screened porch construction and sunroom additions pages go into each project in more depth.

Do porches and sunrooms need permits in Greensboro?

Yes. The City of Greensboro lists decks, room additions, garages and accessory buildings among the new-footprint projects that always need a building permit, and a sunroom or a new porch adds footprint. Electrical work for fans, lights and outlets carries its own permit, and a four-season room's heating and cooling needs a mechanical permit.

State law carves railings, treads and decking out of the structural exclusion in the G.S. 160D-1110 permit exemption, which matters for repairs on an existing deck but not for adding a roof to it. If your house is in one of Greensboro's three local historic districts, a porch or sunroom also needs design approval first; our historic districts guide covers that step.

Which one fits your house?

Choose a screened porch if you want the outdoors without the insects, mostly from spring to fall, at the lowest cost per square foot. Choose a three-season room if you want to stretch the shoulder seasons and keep wind-driven rain off the furniture. Choose a four-season room if what you really want is another room of the house, with the budget, permits and heating and cooling that come with an addition.

The back of the house often makes the decision for you: how the roof can tie in, which door the room opens from, and what the ground does under it. Call any hour and we will look at it with you.