Screened porch, three-season room, sunroom — homeowners use these terms interchangeably, but they're three very different rooms with different price tags, permit paths, and property-tax outcomes. Getting the category right before you design is the most consequential call in the project — the gap between the cheapest option and the most involved one can be nearly tenfold.
In the DFW metroplex, the choice comes down to our climate. North Texas hands you glorious springs and falls, a brutal July and August, and a few hard-freeze weeks in winter. How many of those seasons you want the room to be genuinely comfortable is what separates a screened porch from a true sunroom. Here's how the three compare on cost, permitting, foundation, and HVAC — and how to pick the one that fits your home.
Three rooms on one spectrum
Think of these as a ladder. Each rung adds enclosure, climate control, cost, and permanence.
| Room | What it is | Climate control | Comfortable in DFW | Typical 2026 cost | Counts as living area? |
|---|---|---|---|---|---|
| Screened porch | Roof + screen walls, open air | None | Spring & fall | ~$10–$25/sq ft to screen an existing porch; ~$50–$175/sq ft built new | No |
| Three-season room | Glazed windows + roof, uninsulated | Minimal / portable | Most of the year — not peak summer or the coldest weeks | ~$80–$230/sq ft | Usually no |
| Four-season room / sunroom | Insulated, HVAC-tied — a true addition | Full | Year-round | ~$150–$400/sq ft | Yes |
Every figure here is national market data from cost guides like HomeGuide and Angi — a range, not a quote from The Remo Guys.
Screened porch: open-air, bug-free, budget-friendly
A screened porch is the simplest of the three: a roofed structure with screen — not glass — for its walls. No insulation, no glazing, no climate control. What it does spectacularly well is keep mosquitoes and wasps out while letting the breeze through — the ideal room for exactly the seasons North Texans want to be outside.
Cost. HomeGuide's 2026 data puts screening in an existing covered porch at roughly $10–$25 per square foot, or about $2,000–$5,000; building a new screened porch from the ground up runs about $50–$175 per square foot, or $10,000–$35,000. Angi lands in the same territory — $25–$120 per square foot for a new screened porch and $5–$20 per square foot to enclose an existing one, or roughly $2,000–$4,000 to screen in an existing porch with a ready-made kit.
Permit and foundation. This is the lightest build. Adding screen panels to a porch that already has a roof and slab is sometimes treated as minor work; but any new roof structure needs a building permit and wind-load design (uplift is the real enemy here, not weight), and lighting or a ceiling fan triggers an electrical permit and a state-licensed electrician. A screened porch usually sits on a simple slab — no deep engineered foundation, no vapor barrier, no ductwork.
One Texas-specific wrinkle: if your screened porch fronts a swimming pool, the screen wall can become part of the pool's required safety barrier. Under the pool-barrier provisions DFW cities adopt (IRC Appendix G and the International Swimming Pool and Spa Code), a compliant barrier is generally at least 48 inches tall with no gap a 4-inch sphere can pass, its gates self-closing and self-latching, plus an audible alarm on any house door that opens to the pool area. Confirm your city's adopted edition before you design.
Three-season room: glass walls, most of the year
Step up a rung and screens become glass. A three-season room is enclosed with windows and a roof but is not fully insulated or tied into your home's heating and cooling. You might run a space heater or a window unit to stretch the shoulder seasons, but it isn't built to hold a temperature against a 105-degree August afternoon or an ice storm.
Cost. HomeGuide puts a three-season room at about $80–$230 per square foot, or roughly $8,000–$50,000; Angi pegs a three-season room addition in a similar $10,000–$40,000 range.
The tradeoff: you gain light, views, and protection from wind and rain that a screen can't offer, usable most of the year — but because it isn't conditioned space, an appraiser typically classes it with "enclosed patios," not heated living area. It usually won't add to your official square footage, and its tax impact is modest.
Four-season room (sunroom): a true addition
A four-season room — what most people mean by "sunroom" — is a different animal. It's fully insulated, tied into your HVAC (or given its own dedicated system), and built to be comfortable every day of the year. That means it counts as conditioned living space, adds to your home's square footage, and delivers resale value the other two can't.
It is also, unmistakably, a room addition — the mental shift that matters. It needs a properly engineered foundation (a real consideration on Collin County's expansive Blackland Prairie clay, which swells and shrinks with moisture and will crack an underbuilt slab), a genuine structural and roof tie-in to the house, full insulation and vapor control, and a real HVAC solution. Many builders spec a dedicated mini-split rather than overload your central system, since a glassy room is a heavy thermal load in Texas.
Cost. HomeGuide puts four-season rooms at roughly $200–$400 per square foot, or $20,000–$80,000. Angi lands in the same territory — a sunroom at $150–$300 per square foot, with prefab kits as low as about $100 per square foot.
Because it adds permitted, conditioned square footage, a four-season room is assessed like any room addition — expect it to raise your property taxes. That's not a reason to avoid it; it's a reason to budget for it. We walk through how North Texas appraisal districts handle this in will an addition raise my property taxes in Collin County.
Permits, foundation, and HVAC: where they really diverge
- Permits. All three usually need a building permit for the roof or structure. The four-season room adds full plan review, energy-code compliance, and separate HVAC and electrical permits. In Texas the trades are state-licensed even though general contractors are not — electricians and HVAC techs through the Texas Department of Licensing and Regulation, plumbers and gas fitters through the Texas State Board of Plumbing Examiners.
- Foundation. Screened porch: a simple slab. Three-season room: a slab, sometimes upgraded. Four-season room: an engineered foundation designed for our clay, held to the same standard as any addition.
- HVAC. Screened porch: none. Three-season room: portable at most. Four-season room: a central tie-in or a dedicated mini-split, plus the insulation and vapor barrier needed to actually hold conditioned air.
A note on terminology: Texas issues no statewide residential general-contractor license, so any GC you hire here is insured and bonded, not "licensed." Ask for proof of both, and make sure the trade permits are pulled by the licensed electrician and plumber doing that work.
Which one fits your home?
- Choose a screened porch if budget is the priority, you mainly want the space for spring and fall evenings, and keeping bugs out matters more than climate control.
- Choose a three-season room if you want glass, light, and views usable most of the year and don't need the space to count as heated square footage.
- Choose a four-season room / sunroom if you want year-round comfort, the added square footage and resale value, and you're prepared for the cost and property-tax bump of a true addition.
If there's any chance you'll eventually want year-round use, say so up front: a screened porch built on a foundation and framing that anticipate future glazing is far cheaper to upgrade later than one that has to be rebuilt — the kind of sequencing a design-build team plans for. See how we approach these on our outdoor living and additions & ADUs pages.
Frequently asked
- Does a sunroom add to my home's square footage in Texas?
- A four-season room does, because it's permitted, insulated, and conditioned like the rest of the house, so appraisers count it as gross living area. A three-season room and a screened porch generally do not, since they aren't heated and cooled by a permanent system.
- Do I need a permit for a screened porch in DFW?
- Usually yes — any new roof structure requires a building permit and wind-load design, and lighting or fans add an electrical permit. Adding screen panels to an already-roofed porch is sometimes minor work. Every DFW city runs its own building department, so confirm with yours before you build.
- Will a four-season room raise my property taxes?
- Almost certainly. Because it adds permitted, conditioned living area, your appraisal district will reassess the home at a higher value — the same way any room addition is treated. A screened porch or three-season room typically has a much smaller impact.
- Can I turn a screened porch into a sunroom later?
- Yes, but plan for it. Upgrading to glass and climate control means the foundation, framing, and roof have to meet addition standards — much cheaper to design in from the start than to retrofit. If year-round use is even a maybe, build the bones for it now. The Remo Guys is an insured and bonded design-build general contractor based in Allen, serving Plano, Frisco, McKinney, and the wider DFW metroplex. Tell us how you want to use the space and we'll map the right room, the permit path, and an honest number for your yard.
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