Both add usable living space and resale value, but a screened porch and a sunroom serve very different lifestyles — and very different budgets. If you’re early in deciding which one fits your Wisconsin home, this is a real decision worth thinking through before you fall in love with a photo online. The right answer depends on how many months of the year you want to use the space, whether you want heating and cooling, and how much you’re ready to invest. Here’s how the two compare in the Madison area.
Key Takeaways
- A screened porch is open-air with screened walls and no HVAC — a 3-season space, usable roughly May through October in Wisconsin.
- A sunroom has glass walls; with insulation, heat, and cooling it’s a true 4-season room, though it can also be built as a 3-season space using non-insulated window products.
- Screened porches typically cost $50,000–$80,000; sunrooms run $80,000–$150,000+ — and the ranges overlap at the edges.
- In Dane County’s bug season (June–August), a screened porch is the space you’ll actually live in.
- Both add resale value; sunrooms tend to add slightly more in cold climates, but screened porches have strong buyer appeal.
What’s the Difference?
A screened porch is an open-air structure with screened walls instead of glass. There’s no insulation and no HVAC, so it tracks the outdoor temperature — wonderful on a summer evening, closed up by late fall. In Wisconsin that means comfortable use from about May through October. Underfoot, a screened porch is usually built like a deck, using treated wood, cedar, or composite decking, and depending on the design it often needs a railing.
A sunroom is a fully built room with glass walls and interior-style flooring like the rest of your house. With proper insulation, heating, and cooling it becomes a true four-season space you can use in January — and because it’s essentially a small addition to your home’s conditioned envelope, it costs more. Depending on the window product, a sunroom may not need a railing at all.
The four-season line isn’t absolute, though. A sunroom can also be built as a three-season room using non-insulated window products — there are several on the market we use for this — which lands between a screened porch and a fully conditioned sunroom in both comfort and cost.
One structural difference drives both cost and feel: a sunroom needs wall structures to handle wind bracing, and that bracing can close the space in more than homeowners expect. We’ve worked with engineers to design sunrooms with less bulk than standard code framing would require, keeping the space open and light — but that engineering adds cost, both for the calculations themselves and for the materials and detailing needed to pull it off.
| Screened Porch | Sunroom | |
|---|---|---|
| Cost | $50,000–$80,000 | $80,000–$150,000+ |
| Seasonality | 3-season (May–Oct) | 4-season (if insulated/HVAC); can be built 3-season |
| Permits | Always required, plus zoning | Always required, plus zoning |
| Flooring | Deck-style (treated, cedar, composite) | Interior flooring, like the rest of the house |
| Maintenance | Low–moderate — screens and sweeping; wood decking may need staining and can warp over time | Low — similar to the rest of your home |
| ROI | Strong, especially suburban/lake areas | Slightly higher in cold climates |
Building Over an Existing Deck
A common request is to enclose or build a porch or sunroom on top of an existing deck. Sometimes that works — but often it doesn’t, because many older decks weren’t built with footings large enough or framing strong enough to carry the weight of walls and a roof. When that’s the case, the old deck has to come out and the structure is built from the ground up. It’s worth having the existing deck evaluated early, since it can meaningfully change the scope and the budget.
Wisconsin Climate Considerations
Climate is the deciding factor here more than anywhere else in the country. A screened porch in the Madison area is genuinely usable May through October — and during Dane County’s bug season from June through August, it’s the only outdoor space where you can sit at dusk without being eaten alive. That’s exactly when screened porches shine.
A sunroom earns its keep the rest of the year. Because Wisconsin sits in climate Zone 6, insulation R-value matters a great deal — a poorly insulated sunroom becomes an icebox in winter and an oven in summer, while a properly built one stays comfortable year-round. If a four-season room is where you’re leaning, our guide to three-season vs four-season sunrooms in Wisconsin breaks down the comfort and cost trade-offs in more detail. If you want a space for January mornings with coffee and a book, that’s a sunroom, not a porch.
Cost Comparison in Wisconsin
The budget difference is usually the deciding factor — though the two ranges overlap more than people expect. A screened porch typically runs $50,000–$80,000, depending on size, screening, decking material, and railings. A sunroom typically runs $80,000–$150,000 or more, with the spread driven by insulation and window products, heating and cooling, and the engineered wall bracing the structure requires. Both need permits in Dane County (plus zoning approval), and both need proper frost-depth footings as attached structures.
Put simply: a sunroom generally costs more, but a high-end screened porch can reach entry-level sunroom territory — so the decision rarely comes down to price alone. It comes down to how many months you’ll actually use the space.
Which Adds More Value to a Wisconsin Home?
Both add resale value. Sunrooms tend to add slightly more in colder climates because they expand year-round living space and count toward usable square footage when properly conditioned. Screened porches, though, have outsized buyer appeal in suburban and lake-area neighborhoods around Madison and Windsor — buyers picture summer evenings, and that emotional pull translates to interest. Neither is a wrong investment; they simply appeal to different buyers.
How to Decide
Three questions usually settle it. First, what’s your budget — if the answer is closer to $50,000 than $120,000, a screened porch is the realistic path. Second, how many months do you want to use the space — if three warm-weather seasons is plenty, don’t pay for four. Third, do you want heating and cooling — if year-round comfort is non-negotiable, you’re describing a sunroom. Answer those honestly and the choice tends to make itself.
Beckman Builders Builds Both
Beckman Builders has built both screened porches and sunrooms across the greater Madison area since 2003, including throughout Windsor and Dane County. Because we build both, we can give you an honest recommendation based on your home and how you’ll use the space — not a pitch for whichever one we happen to sell. Learn more on our sun and screen rooms page.
Frequently Asked Questions
Is a screened porch or sunroom cheaper in Wisconsin?
A screened porch is usually the less expensive option, but the gap is smaller than many people expect — roughly $50,000–$80,000 for a porch versus $80,000–$150,000+ for a sunroom, with the ranges overlapping at the high and low ends. The difference comes mostly from insulation, glass and window products, HVAC, and the engineered wall bracing a sunroom requires.
Can you use a sunroom year-round in Wisconsin?
Yes, if it’s properly insulated and has heating and cooling. Because Wisconsin is in climate Zone 6, insulation R-value is critical — a well-built four-season sunroom stays comfortable through Madison-area winters. A sunroom can also be built as a three-season room with non-insulated window products if year-round use isn’t the goal.
How many months can you use a screened porch in Wisconsin?
Roughly May through October in the Madison area. A screened porch has no HVAC, so it tracks outdoor temperatures, making it a comfortable 3-season space and ideal during summer bug season.
Which adds more resale value, a screened porch or a sunroom?
Sunrooms tend to add slightly more value in cold climates because they expand conditioned living space. Screened porches have strong buyer appeal too, especially in suburban and lake-area neighborhoods around Madison and Windsor.
Do I need a permit for a screened porch or sunroom in Dane County?
Yes — both require a permit and zoning approval in Dane County municipalities, and attached structures need proper frost-depth footings. A licensed contractor handles permitting as part of the project.
Can I build a sunroom or porch over my existing deck?
Sometimes, but not always. Many older decks lack footings large enough or framing strong enough to support walls and a roof, in which case the deck has to be rebuilt first. It’s best to have the existing structure evaluated before planning the project.
Not sure which is right for your home? Beckman Builders builds both, so let’s talk through your space, your budget, and how you’ll use it. Explore our sun and screen rooms or call (608) 846-3341 to schedule a free consultation.
