That's our range for a four-season sunroom (insulated, heated and cooled, on a new foundation), with a typical cost of about $300 per sq ft. A popular 12×12 four-season room typically costs about $43,200. A three-season room runs about $155 per sq ft, and a screened porch or enclosed patio about $110.
Estimate Our range, based on sources [1][2]. Planning numbers, not quotes. Glass, foundation and heating and cooling move the price most.
Bars run from our Low to High figure; the dark tick marks Typical. Same numbers as the table below.
Sunroom cost by type
The biggest price question is whether the room is meant for year-round use. A screened porch or enclosed patio keeps the weather out but isn't insulated. A three-season room adds glass walls but usually no heating or cooling. A four-season room is a real addition with insulation, heating and cooling, and a foundation, and a solarium adds a glass roof. The dollar columns use a 12×12 ft (144 sq ft) room, one of the most popular sizes.[1]
| Type | Per sq ft Estimate | 12×12 ft Estimate | Typical Estimate |
|---|---|---|---|
| Screened porch or enclosed patio Built on an existing deck or patio. Usually no insulation, heating, cooling or wiring. | $65 – $150 | $9,400 – $21,600 | $15,800 |
| Three-season room Glass or screen walls and a solid roof, usually on a foundation. Typically not insulated, heated or cooled. | $80 – $230 | $11,500 – $33,100 | $22,300 |
| Four-season room Insulated walls and roof, insulated glass, heating and cooling, and a foundation. Used year-round like any other room. | $200 – $400 | $28,800 – $57,600 | $43,200 |
| Glass solarium Glass walls and a glass roof, usually on a steel or aluminum frame. | $315 – $545 | $45,400 – $78,500 | $64,100 |
Estimate Our range, based on sources [1][2]. For each type we pooled the low, midpoint and high figure each source publishes (a single benchmark figure counts once), then used the median as Typical and the middle half of the pooled figures as Low–High. Totals without a stated size were divided by our 144 sq ft reference room. The screened porch tier pools HomeGuide's enclosed patio or screened porch range with Angi's Arizona room range; the three- and four-season tiers pool HomeGuide's per-sq-ft rates and 12×12 prices with Angi's ranges by type; the solarium tier pools HomeGuide's per-sq-ft rate with Angi's solarium range. Per-sq-ft rates are rounded to $5. See How we build our ranges.
What the sources say Sourced
HomeGuide puts a sunroom at $100 to $350 per sq ft: $80 to $230 per sq ft for a custom three-season room and $200 to $400 for a custom four-season room. It lists a three-season room at $8,000 to $50,000, a four-season room at $20,000 to $80,000, and a glass solarium at $30,000 to $150,000.[1] Angi's 2026 average sunroom addition is $47,000, with most projects between $22,000 and $75,000, or about $150 to $300 per sq ft.[2]
Sunroom cost by size Estimate
| Size | 3-season, typical Estimate | 4-season, typical Estimate | HomeGuide, 4-season Sourced |
|---|---|---|---|
| 10×10 ft | $15,500 | $30,000 | $20,000 – $35,000 |
| 10×12 ft | $18,600 | $36,000 | $24,000 – $42,000 |
| 12×12 ft | $22,300 | $43,200 | $28,500 – $47,500 |
| 12×16 ft | $29,800 | $57,600 | $38,500 – $63,500 |
| 16×16 ft | $39,700 | $76,800 | $50,000 – $80,000 |
| 20×20 ft | $62,000 | $120,000 | $80,000 – $124,000 |
Estimate Our per-sq-ft rates multiplied by the floor area. The HomeGuide column is its published four-season price for each size.[1] Angi puts a 12×12 sunroom at $21,600 to $43,200.[2] The doors, permit and heating and cooling don't grow with size, so large rooms usually cost a little less per square foot than our flat rate suggests.
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Line-item breakdown: a 12×12 four-season sunroom Estimate
Here's how we'd build the budget for a 12×12 four-season room on a new foundation off the back of the house: permit and drawings, foundation, framing, roof, ten insulated windows, a patio door, insulation, wiring, heating and cooling, interior finishing, flooring and cleanup. It's the checklist we'd hold every bid against.
| Line item | How we priced it | Amount Estimate |
|---|---|---|
| Building permit Fee | Our blended typical from HomeGuide's and Angi's sunroom permit ranges[1][2] | $425 |
| Drawings and design Fee | Our allowance for simple permit drawings. HomeGuide puts a full architect design at 5% to 20% of construction cost[1] | $1,500 |
| Foundation Installed price | Midpoint of HomeGuide's sunroom foundation range ($1,000–$6,000)[1] | $3,500 |
| Floor, wall and roof framing, sheathing Materials | Our allowance, about $14 per sq ft of floor | $2,020 |
| Frame the room and tie it into the house Labor | 80 hrs × $29.12/hr median wage for carpenters[4] × 1.7 labor burden | $3,960 |
| Asphalt shingle roof, about 152 sq ft with overhangs Installed price | Our typical installed asphalt rate ($6/sq ft) from the roofing guide | $910 |
| Ten insulated windows Installed price | Midpoint of HomeGuide's range for 10 sunroom windows ($3,500–$12,000)[1] | $7,750 |
| French or sliding glass door Installed price | Midpoint of HomeGuide's sunroom door range ($700–$2,400)[1] | $1,550 |
| Exterior siding below the windows, about 100 sq ft Installed price | Our typical installed vinyl rate ($8/sq ft) from the siding guide | $800 |
| Insulation Installed price | Average of the midpoints of HomeGuide's ($300–$1,500) and Angi's ($500–$1,500) sunroom insulation ranges[1][2] | $950 |
| Wiring and outlets Installed price | Midpoint of HomeGuide's sunroom wiring range ($250–$600)[1] | $425 |
| Light fixtures and a ceiling fan Materials | Our allowance | $350 |
| Heating and cooling Installed price | Midpoint of HomeGuide's sunroom HVAC range ($300–$5,000)[1] | $2,650 |
| Interior finishing: drywall or paneling, trim, paint Installed price | Midpoint of HomeGuide's interior finishing range ($500–$5,000)[1] | $2,750 |
| LVP flooring, 144 sq ft Installed price | Our typical installed LVP rate ($9/sq ft) from the flooring guide | $1,300 |
| Site cleanup Installed price | Midpoint of HomeGuide's cleanup range ($300–$700)[1] | $500 |
| Overhead & profit Our assumption | 20% on the labor and materials lines above. Installed prices and fees already include the installer's margin, so we don't mark them up again. | $1,270 |
| Line-item total | Before contingency and regional adjustment | $32,610 |
Estimate Our line-item build comes to $32,610, about 25% below our blended typical of $43,200. The build prices a plain room with mid-range stock windows and simple finishes, using the midpoint of each published item range. The published four-season totals also cover custom designs, upgraded glass, site work and bigger heating and cooling systems, and Angi puts labor alone at 40% to 60% of a sunroom's cost[2], so treat the gap as a sign of how fast upgrades add up. Method: How we build our ranges.
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Glass
Windows are the biggest line in most sunrooms. HomeGuide puts 10 sunroom windows at $3,500 to $12,000, and notes that non-insulated windows for a three-season room cost less than insulated glass for a four-season room or solarium.[1] Sourced
Heating and cooling
Angi puts adding heating and air conditioning to a sunroom at $2,300 to $20,500, with a ductless mini-split at the low end and new ductwork or baseboard heat at the high end. Only four-season rooms need it.[2] Sourced
Custom vs. prefab
HomeGuide lists prefab sunroom kits at $1,500 to $8,000 and high-end prefab sunrooms from name-brand dealers at $5,000 to $50,000, versus $20,000 to $80,000 for a custom four-season room.[1] Sourced
Contingency Estimate
A sunroom ties into your existing wall and roof, which is where surprises show up. We suggest holding 10% to 15%, more on an older house. That's our planning guidance.
Regional cost differences
A sunroom is new space built onto the house, so we apply our additions cost index to our typical 12×12 four-season room.
| Region (Census division) | Our cost index Estimate | Typical 12×12 four-season room Estimate |
|---|---|---|
| New England CT, ME, MA, NH, RI, VT | 1.05 5% above U.S. | $45,500 |
| Middle Atlantic NJ, NY, PA | 1.14 14% above U.S. | $49,000 |
| South Atlantic DE, DC, FL, GA, MD, NC, SC, VA, WV | 0.97 3% below U.S. | $42,000 |
| U.S. average | 1.00 | $43,200 |
| East North Central IL, IN, MI, OH, WI | 0.94 6% below U.S. | $40,500 |
| East South Central AL, KY, MS, TN | 0.89 11% below U.S. | $38,500 |
| West North Central IA, KS, MN, MO, NE, ND, SD | 1.01 1% above U.S. | $43,500 |
| West South Central AR, LA, OK, TX | 0.92 8% below U.S. | $39,500 |
| Mountain AZ, CO, ID, MT, NV, NM, UT, WY | 0.99 1% below U.S. | $43,000 |
| Pacific AK, CA, HI, OR, WA | 1.09 9% above U.S. | $47,000 |
Estimate Derived, not published. Our additions index divides each division's 2025 Cost vs. Value average for five new-space projects (the accessory dwelling unit, two primary suite additions and two bathroom additions) by the national average and averages the five ratios.[3] The typical column multiplies our national typical by the index. See How we build our ranges.
Costs in your city
Our local cost pages adjust these national ranges for 50 metro areas using local construction wages, and add each area's housing age, climate zone and permit office: Atlanta, Austin, Baltimore, Birmingham, Boston, Charlotte, Chicago, Cincinnati, Cleveland, Columbus, Dallas, Denver, Detroit, Fresno, Grand Rapids, Hartford, Houston, Indianapolis, Jacksonville, Kansas City, Las Vegas, Los Angeles, Louisville, Memphis, Miami, Milwaukee, Minneapolis, Nashville, New York, Oklahoma City, Orlando, Philadelphia, Phoenix, Pittsburgh, Portland, Providence, Raleigh, Richmond, Riverside, Sacramento, Salt Lake City, San Antonio, San Diego, San Francisco, San Jose, Seattle, St. Louis, Tampa, Virginia Beach, Washington. See all local costs →
Sunroom FAQ
How much does a 12x12 sunroom cost?
About $28,800 – $57,600 for a four-season room by our estimate, typically about $43,200, and about $22,300 for a three-season room. HomeGuide puts a 12×12 four-season room at $28,500 to $47,500, and Angi puts a 12×12 sunroom at $21,600 to $43,200.[1][2]
What's the difference between a three-season and a four-season room?
A four-season room is insulated and heated and cooled, so you can use it year-round. A three-season room has glass or screen walls but usually no insulation, heating or cooling. By our ranges a four-season room typically costs about $300 per sq ft, about twice a three-season room's $155.
Is a sunroom cheaper than a room addition?
A three-season room usually is. A four-season room, at a typical $300 per sq ft by our estimate, can cost more per square foot than a basic one-story room addition, typically about $165 per sq ft in our home addition guide, because of all the glass.
Does a sunroom add value to a home?
Some. Angi puts a sunroom's return on investment at about 49%, and HomeGuide at 50% or more.[1][2] Build one because you'll use it, not to flip it.
How long does it take to build a sunroom?
Angi says an average-sized sunroom typically takes two to eight weeks to build, and larger or more elaborate rooms can take longer.[2] Permits can add two to eight weeks before work starts.
Related cost guides
Sources
- HomeGuide, “How much does a sunroom cost?” (updated Aug 22, 2025). homeguide.com/costs/sunroom-cost (accessed Oct 20, 2026).
- Angi, “How Much Does a Sunroom Addition Cost? [2026 Data]” (updated Aug 1, 2026). angi.com/articles/how-much-does-sunroom-cost.htm (accessed Oct 20, 2026).
- Zonda / Journal of Light Construction, 2025 Cost vs. Value Report: national averages and regional pages (New England, Middle Atlantic, South Atlantic, East North Central, East South Central, West North Central, West South Central, Mountain, Pacific) (accessed Oct 8, 2026). © 2025 Zonda Media. We quote a few national figures and use the regional figures only to derive our own cost index. States per division from the U.S. Census Bureau, Census Regions and Divisions.
- U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics (OEWS), May 2025 national median hourly wages by occupation, retrieved through the BLS Public Data API. bls.gov/oes (accessed Oct 8, 2026).
Quoted figures are labeled Sourced. Everything labeled Estimate is our own arithmetic on these sources, explained in How we build our ranges. Planning numbers only, not quotes. Get itemized local bids before you commit.