How Much Does a Sunroom Addition Cost in 2026?
By Michael JohnsonUpdated 7 sources comparedHow we estimate
A sunroom addition typically costs $20,000 to $75,000, and the national average is about $47,000 (HomeAdvisor). Three-season rooms sit at the low end, at roughly $10,000 to $40,000, while insulated four-season rooms run $25,000 to $80,000 or more and glass solariums and conservatories can top $100,000. The type of room, its size, the foundation and whether it needs heating and cooling drive most of the price.
- Typical cost
- $20,000–$75,000
- National average
- $47,000
- Full range
- $5,000–$150,000
The typical range covers a professionally installed three-season or four-season room of about 150 to 250 square feet, including foundation, permit and basic electrical work; DIY kits and small conversions sit at the national low, and large glass solariums and conservatories reach the national high. Prices are per project.
Sunroom cost by type
The table compiles installed prices from independent cost guides. The QuoteRuler typical range is where the sources overlap for a professionally built room of about 150 to 250 square feet.
| Sunroom type | Cost range in sources | Per sq ft in sources | QuoteRuler typical range |
|---|---|---|---|
| Prefab kit (materials only) | $1,500–$40,000 (HomeGuide, HomeAdvisor) | $20–$150 | $5,000–$30,000 before installation |
| Three-season room | $8,000–$50,000 (HomeAdvisor, HomeGuide, Fixr) | $80–$290 (HomeGuide, Block Renovation) | $15,000–$40,000 |
| Four-season room | $20,000–$120,000 (HomeAdvisor, HomeGuide, Fixr) | $200–$400 (HomeGuide, Block Renovation) | $30,000–$80,000 |
| Glass solarium | $30,000–$150,000 (HomeAdvisor, HomeGuide, Fixr) | $300–$800 (HomeGuide) | $40,000–$100,000 |
| Conservatory | $5,000–$150,000 (HomeAdvisor, HomeGuide) | $200–$600, up to $1,200 (HomeGuide) | $50,000–$150,000 for a true glass-roofed conservatory |
The spread is wide because "sunroom" covers very different buildings. A three-season room is an aluminum or vinyl frame with single-pane glass or acrylic panels and little insulation, usable in spring, summer and fall. A four-season room is insulated, has double-pane or better glass and is heated and cooled like the rest of the house. A solarium has a glass roof as well as glass walls. A conservatory is a glass-roofed room with a more traditional, often custom, frame; HomeAdvisor's low figure of $5,000 to $6,000 reflects small garden-room kits rather than full conservatories, so we used HomeGuide's $50,000 to $150,000 for our typical range. Fixr's type figures date from November 2022, so we treat them as a cross-check only.
Sunroom manufacturers quote similar totals. LivingSpace Sunrooms says its rooms typically cost $20,000 to $70,000.
Estimate your cost
Enter the sunroom's floor area, pick the type of room, and tick the work your project needs. Four-season rooms usually need the heating and cooling option.
Ranges come from the sources listed at the end of this guide. The labor portion is adjusted for your state with BEA price data. Your final price depends on site conditions and local codes.
Sunroom cost by size
| Size | Three-season (HomeGuide) | Four-season (HomeGuide) | All types (HomeAdvisor) |
|---|---|---|---|
| 10x10 (100 sq ft) | $8,000–$23,000 | $20,000–$35,000 | $15,000–$30,000 |
| 12x12 (144 sq ft) | $11,500–$33,000 | $28,500–$47,500 | $21,600–$43,200 |
| 16x16 (256 sq ft) | $20,000–$60,000 | $50,000–$80,000 | not listed |
| 20x20 (400 sq ft) | $32,000–$90,000 | $80,000–$124,000 | $60,000–$120,000 |
Block Renovation's 2026 figures for a 12x12 room line up: $18,000 to $42,000 for three-season and $30,000 to $60,000 for four-season. Block notes four-season rooms cost roughly 30% to 60% more per square foot.
Prefab kit vs. custom-built sunroom
Prefab or modular systems from sunroom manufacturers are engineered panels assembled on site, which keeps labor down. HomeAdvisor puts prefab kits at $6,000 to $40,000 for the product alone, and HomeGuide lists low-end DIY kits at $1,500 to $5,000 plus up to $500 shipping. A kit still needs a level foundation, a permit and usually electrical work. Custom stick-built rooms are framed like a regular addition, can match your home's roofline and siding, and cost the most. HomeAdvisor gives $150 to $300 per square foot for custom builds, versus as low as $100 for prefab.
Labor vs. materials
Sunrooms are material-heavy because glass and engineered frames are expensive. HomeAdvisor and Block Renovation both put labor at 40% to 60% of the total, and HomeAdvisor says professional labor runs $18,800 to $28,800 once materials or a kit are bought. HomeGuide's breakdown is lower: labor of $3,000 to $15,000 on an $8,000 to $50,000 three-season room, and $10,000 to $20,000 on a $25,000 to $80,000 four-season room. We use a labor share of 45% for our state adjustments, between those figures. Fixr's 2022 component breakdown shows where the money goes: windows about 25% of the total, frames 18%, roofing 12%, foundation 8%, and HVAC and insulation 6% each.
What drives the price up or down
- Foundation. Building on a sound existing slab or deck saves $3,000 to $8,000 (Block Renovation). A new foundation costs $1,000 to $6,000 (HomeAdvisor, HomeGuide), with a concrete slab at $5 to $10 per square foot and pier-and-beam at $7 to $11 (HomeGuide). An old deck may not carry a glass room's weight, so have it checked. If you need a new slab first, see our concrete patio cost guide.
- Glass. HomeGuide lists single-pane windows at $290 to $460 each, double-pane at $450 to $1,000 and triple-pane at $600 to $1,300. Low-E coatings cut heat gain and loss, which matters most in a four-season room. A glass roof adds $3,000 to $7,000 (HomeGuide).
- Heating and cooling. HomeGuide prices a ductless mini-split at $2,000 to $6,000 and Block Renovation at $3,000 to $5,000 installed for a 12x12 room. Extending existing ductwork costs $10 to $20 per linear foot, but your system may not have the capacity. A ductless mini-split avoids that problem because it doesn't rely on the existing ducts. Our heat pump installation cost guide covers mini-split pricing in more detail.
- Frame material. Aluminum and vinyl are the budget options; wood and fiberglass frames cost more (Fixr).
- Electrical. Outlets run $120 to $275 each, light fixtures $135 to $415 and a ceiling fan $150 to $350 (HomeGuide). If your panel is full, an upgrade adds $850 to $1,700.
- Location. Block Renovation says the Northeast, parts of the West Coast and major metros run 30% to 50% above baseline.
Sunroom addition cost by state
Labor rates and building codes vary by state, and snow and wind loads raise structural requirements in some regions. The table below starts from our national range, compiled from the sources above, and adjusts only the labor portion (45%) using the Bureau of Economic Analysis Regional Price Parities for each state.
| State | Typical range | Average | vs. U.S. |
|---|---|---|---|
| Alabama | $19,100–$71,600 | $44,900 | -4.5% |
| Alaska | $20,200–$75,600 | $47,400 | +0.8% |
| Arizona | $20,100–$75,400 | $47,200 | +0.5% |
| Arkansas | $18,800–$70,400 | $44,100 | -6.1% |
| California | $21,100–$79,300 | $49,700 | +5.7% |
| Colorado | $20,100–$75,500 | $47,300 | +0.6% |
| Connecticut | $20,300–$76,200 | $47,800 | +1.7% |
| Delaware | $19,900–$74,800 | $46,900 | -0.3% |
| District of Columbia | $21,000–$78,600 | $49,300 | +4.9% |
| Florida | $20,300–$76,200 | $47,700 | +1.6% |
| Georgia | $19,700–$73,900 | $46,300 | -1.5% |
| Hawaii | $20,800–$77,900 | $48,800 | +3.9% |
| Idaho | $19,200–$72,100 | $45,200 | -3.9% |
| Illinois | $19,900–$74,600 | $46,800 | -0.5% |
| Indiana | $19,300–$72,400 | $45,400 | -3.5% |
| Iowa | $19,000–$71,200 | $44,600 | -5.0% |
| Kansas | $19,100–$71,600 | $44,900 | -4.5% |
| Kentucky | $19,100–$71,800 | $45,000 | -4.3% |
| Louisiana | $18,900–$71,100 | $44,500 | -5.3% |
| Maine | $19,700–$74,000 | $46,400 | -1.3% |
| Maryland | $20,400–$76,400 | $47,800 | +1.8% |
| Massachusetts | $20,700–$77,800 | $48,700 | +3.7% |
| Michigan | $19,500–$73,000 | $45,800 | -2.6% |
| Minnesota | $19,900–$74,500 | $46,700 | -0.7% |
| Mississippi | $18,900–$70,700 | $44,300 | -5.7% |
| Missouri | $19,300–$72,200 | $45,300 | -3.7% |
| Montana | $19,100–$71,700 | $44,900 | -4.4% |
| Nebraska | $19,100–$71,800 | $45,000 | -4.3% |
| Nevada | $19,700–$74,000 | $46,400 | -1.3% |
| New Hampshire | $20,500–$76,800 | $48,100 | +2.4% |
| New Jersey | $20,800–$78,000 | $48,900 | +4.0% |
| New Mexico | $19,100–$71,800 | $45,000 | -4.3% |
| New York | $20,700–$77,600 | $48,600 | +3.4% |
| North Carolina | $19,500–$73,000 | $45,800 | -2.7% |
| North Dakota | $19,000–$71,200 | $44,600 | -5.1% |
| Ohio | $19,300–$72,200 | $45,300 | -3.7% |
| Oklahoma | $18,900–$71,100 | $44,500 | -5.3% |
| Oregon | $20,400–$76,600 | $48,000 | +2.1% |
| Pennsylvania | $19,800–$74,200 | $46,500 | -1.1% |
| Rhode Island | $20,100–$75,500 | $47,300 | +0.6% |
| South Carolina | $19,400–$72,700 | $45,600 | -3.1% |
| South Dakota | $18,900–$71,000 | $44,500 | -5.4% |
| Tennessee | $19,300–$72,500 | $45,400 | -3.4% |
| Texas | $19,700–$74,100 | $46,400 | -1.3% |
| Utah | $19,600–$73,300 | $45,900 | -2.2% |
| Vermont | $19,700–$73,900 | $46,300 | -1.5% |
| Virginia | $20,100–$75,200 | $47,100 | +0.3% |
| Washington | $20,800–$77,900 | $48,800 | +3.9% |
| West Virginia | $19,100–$71,600 | $44,800 | -4.6% |
| Wisconsin | $19,400–$72,700 | $45,500 | -3.1% |
| Wyoming | $19,200–$71,900 | $45,100 | -4.1% |
The state figures are a starting point. A four-season room in a cold climate needs more insulation and better glass than one in the Sun Belt, regardless of local labor rates.
Three-season vs. four-season: which is worth it?
A three-season room costs roughly half as much, but it is not legal living space in most places and may not count toward your home's finished square footage. HomeGuide notes appraisers may value it at as little as 25% of the home's per-square-foot price. It also gets hot in summer and cold in winter.
A four-season room is built like an addition: insulated walls and floor, efficient glass and conditioned air. It costs more, but HomeGuide says it is generally valued at the home's normal price per square foot. HomeAdvisor reports a 49% average return for sunrooms overall. Converting a three-season room to four-season later costs $5,000 to $20,000 (Fixr, 2022), so if you think you will want year-round use, building four-season from the start can be cheaper.
If you only want a bug-free outdoor room, a screened porch costs far less; see our screened-in porch cost guide. If you need a full bedroom or office with plumbing, compare a conventional room in our home addition cost guide.
DIY vs. hiring a pro
A small three-season kit is one of the few addition-type projects some homeowners assemble themselves, and low-end kits are sold with that in mind. Even then, the foundation, electrical work and any HVAC usually need contractors, and a four-season room's insulation and glazing details are hard to get right without experience. Most sunrooms need a building permit, and electrical circuits and HVAC connections should be done by licensed electricians and HVAC technicians. Have a structural engineer or the manufacturer confirm that an existing deck or slab can support the room.
How to save money on a sunroom
- Build on an existing slab or deck if it is sound and properly footed.
- Pick three-season if you don't need year-round use, but price the four-season upgrade before you decide.
- Choose a manufacturer's modular system instead of a fully custom design.
- Size it to your furniture. A 12x12 room costs about half as much as a 20x20.
- Use a mini-split instead of extending ducts when your system lacks capacity.
- Don't count on the federal credit. The IRS says the Energy Efficient Home Improvement Credit, which covered qualifying windows and heat pumps, does not apply to property placed in service after December 31, 2025. Check your utility for heat pump rebates instead.
- Get three quotes, including at least one from a sunroom specialist and one from a general contractor.
How to compare sunroom quotes
A fair quote should list:
- Room type, exact dimensions, frame material and the glass specification (panes, low-E, tempered).
- Roof type: solid insulated panels, shingles tied into the house, or glass.
- Foundation scope, or written confirmation that the existing slab or deck is adequate.
- Electrical and HVAC work, itemized.
- Permit fees and who pulls the permit.
- Product and labor warranties, which manufacturers and installers often offer separately.
Red flags: high-pressure "today only" pricing, refusal to put the glass specification in writing, no permit in the plan, or a quote that leaves out foundation work on an unknown slab.
Hidden costs people forget
- Permits and design: permits run $250 to $1,500 (HomeAdvisor), and Block Renovation puts architect or designer fees at 5% to 15% of the project.
- Site prep when you can't build on an existing foundation: $500 to $5,600 (HomeAdvisor).
- Window treatments to control glare and heat; Fixr lists blinds at $300 to $1,000.
- Overheating fixes such as film, shades and vents: $1,500 to $4,000 (Block Renovation).
- Flooring and insulation upgrades: HomeAdvisor adds $500 to $1,500 of extra insulation in snow, hail or high-wind areas, and flooring is often priced separately.
- Higher utility bills for a heated and cooled glass room.
- Property tax and insurance increases once the room is assessed.
Bottom line
Most sunroom additions cost $20,000 to $75,000, with $47,000 as a realistic national average. A basic three-season room can come in under $40,000, while a four-season room with HVAC usually runs $30,000 to $80,000 and glass solariums and conservatories cost more. Decide early whether you need year-round use, confirm what your foundation can support, and compare itemized quotes that spell out the glass, roof and HVAC.
Frequently asked questions
Is it cheaper to build a sunroom or an addition?
A three-season sunroom is almost always cheaper than a conventional addition: about $80 to $290 per square foot (HomeGuide, Block Renovation) versus $100 to $300 for a ground-floor room addition. A four-season sunroom, at $200 to $400 per square foot, can cost as much as a standard addition because it needs insulation, efficient glass and HVAC.
How much does a 12x12 sunroom addition cost?
A 12x12 (144 sq ft) sunroom costs about $11,500 to $33,000 as a three-season room and $28,500 to $47,500 as a four-season room, according to HomeGuide. Block Renovation's 2026 figures are similar: $18,000 to $42,000 for three-season and $30,000 to $60,000 for four-season. HomeAdvisor gives $21,600 to $43,200 for all types.
How much would a 20x20 sunroom cost?
A 20x20 (400 sq ft) sunroom costs about $60,000 to $120,000 according to HomeAdvisor. HomeGuide puts a 20x20 three-season room at $32,000 to $90,000 and a four-season room at $80,000 to $124,000.
How much does a 16x20 sunroom cost?
None of our sources list 16x20 directly, but their per-square-foot figures give an estimate. At HomeAdvisor's $150 to $300 per square foot for custom builds, a 320-square-foot room comes to about $48,000 to $96,000. A basic three-season room at HomeGuide's $80 to $230 per square foot would be about $25,600 to $73,600.
What is the difference between a three-season and four-season sunroom?
A three-season room has a lighter frame, single-pane glass or acrylic panels and little insulation, so it is comfortable in spring, summer and fall only. A four-season room has insulated walls and floor, double- or triple-pane glass and heating and cooling, so it can be used year-round and usually counts as living space. Four-season rooms cost roughly 30% to 60% more per square foot (Block Renovation).
Does a sunroom add value to a home?
HomeAdvisor reports a 49% average return on a sunroom addition, and Block Renovation cites 48% to 51%. A heated four-season room is more likely to be valued like the rest of the house; HomeGuide notes a three-season room may be appraised at as little as 25% of the home's per-square-foot value.
Do you need a permit to build a sunroom?
In most jurisdictions, yes. A sunroom attached to the house is treated as an addition, and permits typically cost $250 to $1,500 (HomeAdvisor) or $200 to $500 for a basic building permit (HomeGuide). Electrical and mechanical permits may be required separately.
Sources
We compared these sources to build the QuoteRuler range. State figures adjust the labor portion (45% of the total) using the BEA Regional Price Parities.
- How Much Does a Sunroom Addition Cost? — HomeAdvisor (Angi Inc.). Used for: Title references 2025 data. Average $47,000; typical $22,000–$75,000; custom $150–$300 per sq ft, prefab as low as $100; four-season $25,000–$120,000; three-season $10,000–$40,000; patio enclosure $10,000–$40,000; solarium $30,000–$75,000; conservatory $5,000–$80,000; prefab kit (product only) $6,000–$40,000; by size 10x10 $15,000–$30,000, 12x12 $21,600–$43,200, 20x20 $60,000–$120,000; site prep $500–$5,600; extra insulation $500–$1,500; permits $250–$1,500; labor 40%–60%, or $18,800–$28,800; ROI 49%..
- How Much Does a Sunroom Cost? — HomeGuide. Used for: Page shows no update date. Three-season $8,000–$50,000 ($80–$230 per sq ft); four-season $20,000–$80,000 ($200–$400); solarium $30,000–$150,000 ($300–$800); conservatory $50,000–$150,000 ($200–$600, up to $1,200); prefab kit $1,500–$8,000; DIY kit $1,500–$5,000 plus up to $500 shipping; sizes 10x10, 12x12, 16x16 and 20x20 for three- and four-season; foundation $1,000–$6,000, slab $5–$10 and pier-and-beam $7–$11 per sq ft; mini-split $2,000–$6,000; ductwork $10–$20 per linear ft; windows single-pane $290–$460, double-pane $450–$1,000, triple-pane $600–$1,300; glass roof $3,000–$7,000; outlets $120–$275, fixtures $135–$415, fan $150–$350, panel upgrade $850–$1,700; permit $200–$500; labor vs. materials table; three-season rooms may appraise at 25% of living-space value..
- How Much Does a 12x12 Sunroom Cost? — Block Renovation. Used for: Published May 6, 2026. 12x12 three-season $18,000–$42,000 ($125–$290 per sq ft); four-season $30,000–$60,000 ($200–$400); four-season 30%–60% more per sq ft; existing slab or deck saves $3,000–$8,000; mini-split installed $3,000–$5,000; three-season electrical $500–$1,500; permits $200–$1,500; labor 40%–60%; architect or designer 5%–15%; overheating retrofits $1,500–$4,000; Northeast, West Coast and major metros 30%–50% above baseline; ROI 48%–51%..
- How Much Does It Cost to Build a Sunroom? — Fixr. Used for: Last updated November 10, 2022 (older data, used only as a cross-check). Average $55,000, typical $35,000–$70,000; three-season $20,000–$50,000; four-season $35,000–$100,000; solarium $40,000–$100,000; three-season to four-season conversion $5,000–$20,000; component shares (windows 25%, frames 18%, roofing 12%, foundation 8%, HVAC 6%, insulation 6%); blinds $300–$1,000; frame materials aluminum and vinyl cheapest, wood highest..
- How Much Will My Sunroom Addition Cost? Price Guide — LivingSpace Sunrooms (manufacturer). Used for: Manufacturer's stated typical price range for its sunrooms: $20,000–$70,000, depending on size, customization, style and color..
- Energy Saver: Tips on Saving Money and Energy in Your Home (2022 guide) — U.S. Department of Energy (Energy Saver). Used for: Ductless mini-split heat pumps can be installed in homes or additions without ducts..
- Energy Efficient Home Improvement Credit — IRS. Used for: Section 25C credit for qualifying windows and heat pumps does not apply to property placed in service after December 31, 2025..
- Regional Price Parities by State, 2023 — U.S. Bureau of Economic Analysis. Used for: state cost adjustments.