Sunroom addition: cost & ROI
Adding a glassed-in sunroom or three/four-season room to extend living space toward the garden. It's a lifestyle upgrade buyers enjoy, but a national average recoups only about half its cost — a four-season, fully insulated room returns more than a three-season or screened one.
Worth knowing: National data puts sunroom recovery at roughly 49–55% of cost (midrange ≈ 50%), though it varies widely — four-season rooms outperform three-season and screened ones. Like a pool, treat it as a lifestyle purchase that adds some value, not an investment that pays for itself.
“Net cost after resale” = project cost − resale value added. It's the part you don't recoup at sale, not a loss — most renovations cost more than they return, with the difference buying you the use and enjoyment of the upgrade.
How much does a sunroom addition cost in 2026?
A sunroom extends living space toward the garden with a light-filled, glassed-in room — a lifestyle upgrade buyers enjoy, but one that recoups only about half its cost on a national average. In 2026 a sunroom addition averages around $50,000, ranging from roughly $25,000 for a three-season room to $80,000+ for a fully insulated four-season room that ties into the home's heating. It recoups about 50% of its cost, so it's best treated as space you build to use rather than as a resale investment.
The single biggest variable is whether the room is three-season or four-season. A three-season (or screened) room is cheaper but usable only in mild weather and adds little to counted living area; a four-season room with insulation, proper glazing and climate control reads as genuine, year-round square footage and returns noticeably more. Foundation work, the extent of glazing, and roof tie-in complexity round out the cost.
| Type | Typical installed cost | Notes |
|---|---|---|
| Screened / three-season room | $25,000–$40,000 | Not fully insulated; usable in mild weather only. |
| Four-season room (national avg) | $45,000–$60,000 | Insulated, climate-controlled, counts as living space. |
| Large four-season addition | $60,000–$80,000 | Bigger footprint, premium glazing, full HVAC tie-in. |
| Premium / conservatory | $80,000–$110,000+ | High-end glazing, bespoke design, extensive foundation work. |
Ranges are 2026 US market figures compiled from industry cost guides; your local quote depends on size, finish and labour rates.
What a sunroom addition typically includes
- Foundation or reinforced slab
- Framing and large glazed walls/roof
- Insulation and climate control (four-season)
- Flooring, electrical and lighting
- Permits and professional fees
Pro tip: A four-season room that ties into the home's heating and finishes reads as real living space and returns more; a three-season or screened room is cheaper but recoups noticeably less.
How sunroom addition compares
Ranked by share of cost recouped at resale, sunroom addition is #31 of 32 projects we track.
What affects the cost
- Three- vs four-season
- Insulation, glazing and climate control make a four-season room cost — and return — more than a screened one.
- Foundation
- A slab or reinforced foundation for a heated room costs more than a simple deck-style base for a three-season room.
- Glazing extent
- More glass and higher-performance windows raise both cost and comfort.
- HVAC tie-in
- Extending heating and cooling into the room is what makes it count as living space — and adds cost.
Sunroom addition cost by region
Costs vary by market. These are midrange estimates adjusted for regional price levels — always confirm with local quotes.
Full cost-by-location table (with ROI)
| Location | Estimated cost | Recouped |
|---|---|---|
| US National Average | $50,000 | 50% |
| New York, NY | $65,000 | 50% |
| Los Angeles, CA | $61,000 | 50% |
| Chicago, IL | $55,000 | 50% |
| Houston, TX | $49,000 | 50% |
| Phoenix, AZ | $48,500 | 50% |
| Miami, FL | $54,000 | 50% |
| Seattle, WA | $61,000 | 50% |
| Denver, CO | $54,000 | 50% |
| Atlanta, GA | $49,000 | 50% |
| Boston, MA | $63,000 | 50% |
| San Francisco, CA | $69,000 | 50% |
| London, UK | £41,500 | 50% |
| Manchester, UK | £35,600 | 50% |
| Birmingham, UK | £34,800 | 50% |
| Edinburgh, UK | £38,700 | 50% |
| Dublin, IE | €49,700 | 50% |
| Toronto, CA | C$71,900 | 50% |
| Vancouver, CA | C$76,700 | 50% |
| Sydney, AU | A$83,600 | 50% |
| Melbourne, AU | A$77,500 | 50% |
| Auckland, NZ | NZ$89,100 | 50% |
| Washington, DC | $56,500 | 50% |
| Philadelphia, PA | $57,500 | 50% |
| Minneapolis, MN | $53,500 | 50% |
| Austin, TX | $44,500 | 50% |
| Dallas, TX | $43,500 | 50% |
| Glasgow, UK | £35,200 | 50% |
| Bristol, UK | £37,500 | 50% |
| Calgary, CA | C$66,400 | 50% |
| Montreal, CA | C$61,700 | 50% |
| Brisbane, AU | A$79,800 | 50% |
| San Diego, CA | $59,000 | 50% |
| Portland, OR | $56,500 | 50% |
| Nashville, TN | $47,500 | 50% |
| Charlotte, NC | $46,000 | 50% |
| Tampa, FL | $49,000 | 50% |
| Leeds, UK | £34,800 | 50% |
| Perth, AU | A$81,300 | 50% |
| Adelaide, AU | A$68,400 | 50% |
| Wellington, NZ | NZ$85,000 | 50% |
| Christchurch, NZ | NZ$80,000 | 50% |
Before you spend
- Get 3 written quotes from licensed local contractors before committing
- Match finishes to what's normal for your neighbourhood, not above it
- Keep a 10–15% contingency for surprises once work starts
- Avoid overcapitalising — check what comparable homes nearby actually sell for
- If you're selling soon, weigh resale timing against how long the project will take
Frequently asked questions
How much does a sunroom cost in 2026?
About $50,000 on average, from roughly $25,000 for a three-season room to $80,000+ for a fully insulated four-season room.
Does a sunroom add value?
It recoups around 50% of its cost — a four-season room that counts as living space returns more than a three-season or screened one. Treat it as a lifestyle addition.
Three-season or four-season sunroom?
A four-season room costs more but is usable year-round and adds to counted living area; a three-season room is cheaper but limited to mild weather.
Is a sunroom cheaper than a regular addition?
Usually yes — its glazed, lighter construction costs less per square foot than a conventional framed addition, though it also returns less.
Related cost guides
Estimate your own sunroom addition
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How it compares
Every project ranked by how much of its cost you recoup at resale, at your settings. Your pick is highlighted.
Methodology
Figures are national midrange “Cost vs. Value” averages adjusted for finish, scope and region. They are planning estimates, not quotes or appraisals, and lean toward US/UK/Canada/Australia mid-markets. Reviewed June 2026. See our full methodology →
Get your own sunroom addition numbers
See how the sunroom addition stacks up against 31 other renovations, or take the numbers with you.