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How much does a sunroom addition cost?

A sunroom addition costs $22,000 to $75,000 in 2026. What changes your price is below.

HomeAdvisor puts the average at about $47,000, or $150 to $300 per square foot. A 12 by 12 foot three season room runs about $11,500 to $33,000 and a four season room of the same size $28,500 to $47,500. Prefab kits and screen rooms can start near $8,000.

A sunroom addition costs $22,000 to $75,000 in 2026

Estimate your sunroom addition cost

Pick what you need and add your ZIP. The price updates as you go. Got a price already? Check it in the last step.

1Which one do you need?
2Size
3What is your ZIP?
Local prices not added yet.
4Got a price?
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Is this price fair?

A fair price is $28,500 to $47,500.

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Low$38,000High
Your estimateUS average
$28.5Kto$47.5K

Middle of the range: $38,000

$0$32,070$64,140
Normal range Middle

What you are paying for

Four season12 by 12. US range for this job.$28,500 to $47,500
About 12 by 12Size.Base price
US averageLocal prices not added yet.US price
Middle of rangeHalfway between low and high.$38,000
How we calculate this

    Prices are for the United States in 2026 from published cost guides, checked September 2026. This is an estimate, not a quote.

    Middle $38,000$28.5K to $47.5K

    Cost by type

    Screen room or three season$8,000 to $25,000 (Always Do Better, 2026).
    12 by 12 three season$11,500 to $33,000.
    12 by 12 four season$28,500 to $47,500.
    Prefab four season kit$25,000 to $40,000.
    Solarium with glass roof$30,000 to $100,000.
    Conservatory$50,000 to $150,000.

    Is your quote fair?

    Type the price you were quoted. We compare it to the usual 2026 range of $22,000 to $75,000.

    What pushes a quote up

    Three or four seasonInsulation, double pane glass and heating and cooling add a lot.
    SizePriced by the square foot.
    GlassWindows cost more than regular wall.
    FoundationA new slab or footings add cost.
    PermitsTreated like a home addition in most towns.

    Sunroom addition cost by region

    Lower cost states$17,600 to $60,000. Alabama, Arkansas, Indiana, Iowa, Kansas, Kentucky, Mississippi, Missouri, Oklahoma, Tennessee, West Virginia and most rural areas.
    Average cost states$22,000 to $75,000. Arizona, Florida, Georgia, Michigan, North Carolina, Ohio, Pennsylvania, Texas, Virginia and most mid size cities.
    Higher cost states$28,600 to $97,500. California, Connecticut, Hawaii, Massachusetts, New Jersey, New York, Washington, plus big metros such as Chicago, Denver and Washington DC.

    These rows are our estimate. We took the typical national range and adjusted it for local labor costs, which run about 20 percent lower in the cheapest states and about 30 percent higher in the dearest ones. Labor and permit costs vary widely by region, so local quotes matter.

    Three season or four season

    This Old House explains the split. A three season room uses single pane windows and is meant for mild weather. A four season room has double pane windows and heating and cooling so you can use it all year. The four season version costs far more and needs more permits.

    A sunroom is not cheaper than a regular addition. Ken Ward, a Virginia remodeler quoted by Real Homes, says windows drive up the cost because glass costs more than a normal wall of siding, insulation and drywall. Angi's figures put a sunroom at $150 to $300 per square foot, against $80 to $200 for a regular addition.

    Deck conversions

    Prefab kits are often used to enclose an existing patio or deck. Make sure the deck can carry the weight before you buy.

    Why this costs more in 2026

    Glass, framing lumber and trade labor all cost more this year.

    Fuel went up fast this year. AAA diesel topped $6 a gallon on September 11, 2026 (CBS 8), and building material prices rose 4.8 percent in a year (Roofing Contractor). Get the quote date in writing.

    How to judge the quote in your hand

    Ways to pay less