How much does a sunroom cost in Columbia, SC?

A sunroom in Columbia, SC typically starts at about $200 per square foot. For a typical 150 to 250 square foot room, that lands between roughly $30,000 for a small build and $50,000 for a large one. These are typical ranges, not a quote. Your exact price is set in writing first.

What's the difference between a 3-season and 4-season sunroom?

A 3-season sunroom is built for spring, summer, and fall, glass-forward but not climate-controlled. A 4-season sunroom is insulated and conditioned to stay comfortable year-round, so it lives like any other room. The 4-season build costs more and sits toward the top of the total price band.

Why do sunroom bids vary so much?

Most variation comes from scope. A low bid often skips insulation, the proper roof tie-in, or foundation detail, then recovers it later through change orders. A complete bid lists the full scope, schedule, and fixed price in writing up front, so the final cost matches the quote, no surprise billing.

Does Chonko Construction build year-round sunrooms?

Yes. As a licensed South Carolina home builder (license #52210), Chonko Construction builds and installs both 3-season and 4-season sunrooms across Columbia and the Midlands. Every project comes with full written scope, a fixed price, a final walkthrough, and a named workmanship warranty.

Sunroom Cost in Columbia, SC (2026): Real Price Ranges from a Licensed Builder

A sunroom in Columbia, SC typically costs from about $200 per square foot, depending on whether you build a 3-season or 4-season room, so a typical 150 to 250 square foot sunroom in the Midlands lands somewhere between $30,000 (small) and $50,000 (large). These are typical ranges, not a quote. The exact number gets set in writing before any work starts. The big swing comes down to one decision: how many seasons you want to use the room. We build sunrooms and outdoor living space across Columbia and the Midlands.

A 3-season sunroom is built for spring, summer, and fall, generous glass, a comfortable shoulder-season space, but not designed to hold a steady temperature in a January cold snap or a July heat index. A 4-season sunroom is insulated, climate-controlled, and tied into (or independently heated and cooled for) your home's comfort system, so it lives like any other room year-round. That difference drives both the per-square-foot cost and where you land in the total band.

What a sunroom costs by season type

Tier	What you get	Typical price
3-season (small, ~150 sq ft)	Glass-forward room for spring–fall use	from ~$200/sq ft
4-season (mid, ~200 sq ft)	Insulated, climate-controlled, year-round	from ~$200/sq ft
4-season (large, ~250 sq ft)	Full year-round room, larger footprint	from ~$200/sq ft
Typical total band	150–250 sq ft, built	about $30,000 (small) to $50,000 (large)

Per-square-foot pricing starts at about $200; a 4-season build sits at the higher end of the total band because of insulation, conditioning, and a heavier structural envelope. These are typical ranges, not a quote, your exact number is set in writing.

Three-season or four-season is the fork that sets the price.

The choices that set your sunroom price

3-season vs 4-season. Insulation, climate control, and a sealed envelope move a 4-season room toward the top of the band. A 3-season room costs less because it's not built to hold temperature.
Size and footprint. More square feet means more glass, more roof, and more foundation. The jump from a small to a large room is most of the gap between $30,000 and $50,000.
Foundation and attachment. How the room ties into your existing house, slab, or footings affects structural and waterproofing work.
Glass and framing package. Window-to-wall ratio, glass quality, and frame material all move the per-square-foot figure.
Heating, cooling, and electrical. A 4-season room needs conditioning and wiring; a 3-season room needs far less.
Roof and tie-in. Matching the new roofline to your existing roof cleanly adds labor and material.

Insulation, HVAC, and a code-rated foundation are the usual omissions.

The line items missing from a cheap sunroom quote

Sunroom quotes are hard to compare because the cheap one is usually pricing a lighter room than you pictured. Read any bid for these five lines specifically.

Insulation, in all three planes. Walls, roof, and floor. A room sold as 4-season without insulation in the roof and under the floor is a 3-season room with a thermostat losing an argument with a Midlands July.
The conditioning, and the circuit that feeds it. Heating and cooling is one line item; the electrical work to power it is another. A quote naming neither is not pricing a year-round room.
The glass package, by spec. Insulated units and coated glass are a different product from basic glazing, and the quote should say which one you are buying and in which frame material.
The roof tie-in. Where the new roof meets your existing wall, the flashing and step detail is what keeps water out of that seam. It is real labor and it belongs on the page.
The foundation. A sunroom carries wall and roof load. Setting it on an existing slab or deck that was never sized to hold that load is not a savings, it is a deferred bill.

What your sunroom quote itemizes

Full scope in writing, structure, glass package, foundation, roof tie-in, and finishes, line by line
A clear schedule with start and finish dates
One fixed price agreed before work begins, no surprise billing
One accountable licensed builder (SC license #52210) coordinating every sub on the job
A final walkthrough with you before we call it done
A named workmanship warranty in writing

A three-season room built to convert later spreads the cost out.

Holding a sunroom budget down

Decide 3-season vs 4-season up front. It's the single biggest cost lever, choosing once, in writing, avoids the most expensive mid-project change.
Lock the footprint before framing. Resizing after the foundation is set is where budgets break.
Pick your glass and finish package early so nothing gets re-specified mid-build.
Insist on full scope in the contract, a complete written scope is what protects the budget from change orders.

Building a sunroom should feel like an upgrade, not a gamble. If you're weighing a 3-season versus 4-season room, or just want to know where your space would land in the range, book a free phone consultation with Chonko Construction. We'll walk the scope with you and put a clear, complete number in writing before any work begins.