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How Much Does a Sunroom Cost to Build? (2026 Prices)
These numbers aren't national averages — they come from the actual material lists of 39 buildable sunrooms designs, priced line by line (lumber, hardware, concrete, roofing) at 2026 retail prices. DIY material costs range from $4,175 to $13,739, with a median of $8,638. Contractor estimates below add labor (about 65% of materials), overhead and profit.
Cost by design and size
| Design | DIY materials | Contractor estimate | Plan |
|---|
| Bryce Sunroom Plan — 12x16 Deck with Gable Sunroom | DIY… | $4,175 | $8,715 | $43 |
| Marca Sunroom Plan – 14x14 Deck with Classic Gable Sunroom… | $4,233 | $8,835 | $43 |
| Mikel Sunroom Plan – 12x20 Deck with Classic Gable Sunroom… | $4,848 | $10,118 | $43 |
| Costa 12x12 Monoslope Sunroom Plan – Compact Modern… | $4,927 | $10,284 | $43 |
| Diaz 12x14 Monoslope Sunroom Plan – Modern Backyard… | $5,253 | $10,964 | $43 |
| Bori Sunroom Plan — 16x16 Deck with Gable Sunroom | DIY… | $5,306 | $11,074 | $43 |
| Raya Sunroom Plan – 14x20 Deck with Classic Gable Sunroom… | $5,319 | $11,102 | $43 |
| Mariah 14x14 Modern Monoslope Sunroom Plan – DIY Backyard… | $5,469 | $11,415 | $43 |
| Silva 12x16 Modern Monoslope Sunroom Plan – DIY Backyard… | $5,600 | $11,689 | $43 |
| Nunez 14x16 Modern Monoslope Sunroom Plan – DIY Backyard… | $5,852 | $12,215 | $43 |
| Dalia 12x18 Monoslope Sunroom Plan – Modern Backyard… | $5,912 | $12,340 | $43 |
| Abaz 14x18 Monoslope Sunroom Plan – Modern Backyard… | $6,221 | $12,985 | $43 |
| McWilliam 16x16 Modern Monoslope Sunroom Plan – DIY… | $6,500 | $13,568 | $43 |
| Julius Sunroom Plan – 8x14 Deck with Classic Gable Sunroom… | $7,771 | $16,220 | $43 |
| Malee Sunroom Plan – 8x16 Deck with Classic Gable Sunroom… | $8,066 | $16,835 | $43 |
| Vogo 12x20 Modern Monoslope Sunroom Plan – DIY Backyard… | $8,202 | $17,120 | $43 |
| Arnie Sunroom Plan — 10x14 Deck with Gable Sunroom | DIY… | $8,320 | $17,365 | $43 |
| Baker 14x20 Monoslope Sunroom Plan – Modern Backyard… | $8,458 | $17,654 | $43 |
| Leslie Sunroom Plan – 8x18 Deck with Classic Gable Sunroom… | $8,513 | $17,768 | $43 |
| Deely Sunroom Plan — 10x16 Deck with Gable Sunroom | DIY… | $8,638 | $18,030 | $43 |
| Lizzie Sunroom Plan – 8x20 Deck with Classic Gable Sunroom… | $8,781 | $18,328 | $43 |
| Emmons 14x22 Monoslope Sunroom Plan – Modern Backyard… | $8,788 | $18,344 | $43 |
| Ina 12x24 Monoslope Sunroom Plan – Modern Backyard Sunroom… | $8,807 | $18,382 | $43 |
| Margo Sunroom Plan – 12x14 Deck with Classic Gable Sunroom… | $8,875 | $18,523 | $43 |
| Perliter 14x24 Modern Monoslope Sunroom Plan – DIY… | $9,122 | $19,041 | $43 |
| Roberto 10x18 Gable Sunroom Plan — DIY Covered Deck with… | $9,158 | $19,115 | $43 |
| Palora 12x14 Screened Gazebo Plan — Charming Outdoor… | $9,255 | $19,317 | $43 |
| Samba 10x20 Gable Sunroom Plan — DIY Covered Deck with… | $9,529 | $19,889 | $43 |
| Deliah Sunroom Plan – 12x18 Deck with Classic Gable… | $9,710 | $20,267 | $43 |
| Pedro Sunroom Plan – 14x16 Deck with Classic Gable Sunroom… | $9,824 | $20,505 | $43 |
| Avonwood 14x14 Gazebo Plan — Spacious Screened Outdoor… | $9,849 | $20,557 | $43 |
| Torres 14x18 Gable Sunroom Plan — DIY Covered Deck with… | $10,338 | $21,577 | $43 |
| Orie Sunroom Plan – 16x18 Deck with Classic Gable Sunroom… | $10,732 | $22,400 | $43 |
| Wingrove 16x16 Gazebo Plan — Spacious Screened Outdoor… | $11,198 | $23,373 | $43 |
| Merino Sunroom Plan – 16x20 Deck with Classic Gable… | $11,311 | $23,608 | $43 |
| Ayla Sunroom Plan — 18x18 Deck with Gable Sunroom | DIY… | $12,277 | $25,626 | $43 |
| Haverford 18x18 Gazebo Plan — Spacious Screened Outdoor… | $12,460 | $26,007 | $43 |
| Garcia Sunroom Plan – 18x20 Deck with Classic Gable… | $12,523 | $26,138 | $43 |
| Sonata 20x20 Gazebo Plan — Spacious Screened Outdoor… | $13,739 | $28,676 | $43 |
What drives the cost
Size is the biggest factor, followed by roof type and foundation. Every plan above includes the full material list, so you can price it at your local lumberyard — or open the design's live calculator (linked from each plan page) to see the line-by-line breakdown behind these totals.
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