Castelle Prism Sofa High Back Deep 3-Seater
High back outdoor sofas with genuine deep seating dimensions can be surprisingly rare -- most manufacturers compromise on either back support or seat depth to keep costs manageable. The Castelle Prism High Back Deep 3-Seater is an 82.5-inch contemporary outdoor sofa built for three adults with full back support and 28.5-inch seat depth, available at LOOMLAN with free shipping to the continental US. This handcrafted aluminum frame sofa anchors the Prism Collection's modern aesthetic with powder-coated finish and customizable upholstery options. Made in the USA by Castelle, a premium outdoor furniture manufacturer known for welded aluminum construction, the Prism sofa delivers rust-resistant durability for coastal and poolside installations. You're looking at a serious piece of outdoor furniture that doesn't require constant repositioning or fluffing to stay comfortable.
What Is an Outdoor Deep Seating Sofa?
An outdoor deep seating sofa is a three-person seating piece designed with seat depths of 24 inches or greater, full back cushions, and weather-resistant construction for year-round outdoor use. Unlike standard outdoor benches or dining furniture, deep seating sofas prioritize lounging comfort over upright dining posture. Also known as outdoor sectional components or patio sofas, these pieces anchor outdoor living spaces with the same comfort expectations as indoor furniture. Best for covered patios, screened porches, and poolside lounge areas where extended relaxation is the primary goal.
Key Features of the Castelle Prism High Back Deep Sofa
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High Back Design -- The 39-inch overall height includes a supportive high back that extends well above shoulder level for three adults, providing lumbar support during extended outdoor entertaining. Unlike standard outdoor sofas that top out at 32-34 inches, this high back design prevents the slouching that happens when guests settle in for longer conversations.
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True Deep Seating Dimensions -- The 28.5-inch seat depth allows adults to sit fully back against the cushions with proper leg support, rather than perching on the front edge. This is 4-6 inches deeper than most outdoor sofas, creating the comfort level you'd expect from quality indoor furniture.
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Welded Aluminum Frame Construction -- Castelle's signature welded extruded aluminum frame eliminates the flex and wobble common in bolted outdoor furniture. The sled-leg base distributes weight evenly across the frame, preventing the sagging that develops in multi-person seating over time.
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Powder-Coated Rust Resistance -- The aluminum frame receives a multi-stage powder coating process that bonds directly to the metal, creating a barrier against salt air, pool chemicals, and UV exposure. This coating won't chip or peel like painted finishes, maintaining its appearance through years of coastal or poolside use.
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Customizable Frame and Fabric Options -- Available in 20+ powder-coated frame finishes and 100+ Sunbrella fabric options, allowing coordination across an entire outdoor space or specific matching to architectural elements. The shown warm gray frame represents just one option in the full Castelle color palette.
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Antimicrobial Cushion Technology -- The cushions feature mildew-resistant, antimicrobial treatment that prevents odor and bacterial growth in humid climates. Combined with hypoallergenic fill, this makes the sofa suitable for guests with allergies or sensitivities.
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Commercial-Grade Engineering -- Built to contract-grade specifications with reinforced stress points and commercial-quality hardware. The frame engineering meets hospitality durability standards while maintaining residential comfort levels.
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Made in USA Manufacturing -- Handcrafted in Castelle's US facility with domestic aluminum and quality control standards that ensure consistent frame welding and finish quality across production runs.
Outdoor Sofa Sizing and Space Planning
At 82.5 inches wide by 36.5 inches deep, the Prism sofa requires a minimum space of 10 feet wide by 8 feet deep to allow for coffee table placement and circulation. For comfortable conversation groupings, position the sofa 8-10 feet from opposing seating with a fire table or outdoor coffee table centered between them. The 19-inch seat height (with cushions) aligns perfectly with standard outdoor coffee table heights of 16-18 inches, creating proper proportions for drinks and dining.
Allow 18 inches minimum between the sofa front and any coffee table -- this provides enough space for guests to stand without moving furniture. For poolside placement, position the sofa at least 36 inches from the pool edge to meet most residential safety codes and allow comfortable towel placement.
The deep 28.5-inch seat depth means guests sit 6-8 inches further back than on standard outdoor furniture, creating a more relaxed, residential feel. This depth works especially well for covered patios and screened porches where the seating will be used for extended periods rather than quick poolside breaks.
Styling Your Contemporary Outdoor Living Space
The Prism sofa's clean lines and sled-base design pair naturally with mid-century modern and contemporary outdoor styling. Position it as the anchor piece on a large
outdoor rug that extends at least 2 feet beyond all sides of the seating arrangement.
Add visual interest with contrasting
outdoor throw pillows in bold geometric patterns or rich jewel tones. The high back provides an excellent backdrop for larger 22-inch or 24-inch pillows that won't get lost against the frame height.
For coffee table pairing, consider a rectangular fire table or sleek aluminum outdoor coffee table that echoes the sofa's linear aesthetic. Flank the seating area with tall
outdoor planters containing architectural plants like bamboo or ornamental grasses.
The customizable frame finishes allow perfect coordination with existing outdoor elements -- match pool coping, railing colors, or architectural trim for a cohesive outdoor room feeling. For covered patios, add
outdoor wall art behind the sofa to create a finished living room atmosphere.
Interior designers specifying contemporary outdoor seating for high-end residential projects will find the Castelle customization options and contract-grade construction ideal for client spaces that demand both style and durability. Well-suited for luxury vacation rentals and boutique hotels requiring outdoor furniture that photographs beautifully while withstanding commercial use -- the high back design and deep seating create the upscale resort aesthetic that drives bookings. Ideal for homeowners with large covered patios or poolside terraces who need seating for six to eight people when paired with additional lounge chairs from the Prism collection.
Frequently Asked Questions
- How does the high back design affect comfort compared to standard outdoor sofas?
- The 39-inch total height provides shoulder and upper back support for adults up to 6 feet tall, preventing the forward slouch that develops on standard 32-34 inch outdoor sofas during extended seating. The high back also creates better conversation acoustics by positioning heads at more natural angles for group discussions.
- Can this sofa handle saltwater coastal environments?
- Yes, the welded aluminum frame with multi-stage powder coating is specifically engineered for coastal installations. Unlike steel frames that rust or wood that warps, aluminum won't corrode in salt air. The powder coating bonds chemically to the aluminum, creating a barrier against salt spray and UV exposure that maintains its appearance for years.
- What's included with the sofa and are cushions Sunbrella fabric?
- The sofa includes frame and full cushion set with antimicrobial, mildew-resistant fill. Cushion fabrics are available in 100+ Sunbrella options -- the specific fabric grade and pattern are selected during ordering through LOOMLAN's customization process.
- Is there a trade discount for designers and commercial buyers?
- Yes, LOOMLAN's trade program offers up to 40% off retail with no minimum order requirement. Approval takes 1-2 business days and trade pricing automatically applies at login. Apply free at LOOMLAN's trade program page.
- How does this compare to West Elm or CB2 outdoor sofas in the same price range?
- The Castelle Prism offers welded aluminum construction versus the bolted frames common at mass retailers, eliminating wobble and extending lifespan. The made-in-USA manufacturing provides quality control and customization options not available from imported furniture. The 28.5-inch seat depth is also significantly deeper than most mass-market outdoor sofas.
- What's the lead time for custom frame and fabric combinations?
- Castelle furniture is made to order with 4-6 week production time. This allows full customization of both frame finish and cushion fabric but requires advance planning for seasonal installations or project deadlines.
- What is LOOMLAN's return policy for custom outdoor furniture?
- Custom orders like the Castelle Prism with specific frame and fabric selections are final sale due to the personalized nature of the configuration. Standard return policy details are available at LOOMLAN's returns page.
For Trade Professionals & Commercial Buyers
The Castelle Prism High Back Deep Sofa serves three critical commercial applications where standard outdoor seating falls short. Luxury vacation rentals and high-end STR properties benefit from the deep seating comfort that creates memorable guest experiences -- the high back design and generous cushions photograph exceptionally well for listing marketing while providing the durability needed for constant guest turnover. Resort and boutique hotel terrace installations find the made-to-order customization allows perfect brand color matching while the contract-grade construction handles commercial usage without premature wear. Senior living and assisted care outdoor areas require the high back support for residents who need assistance transitioning from sitting to standing -- the 19-inch seat height and supportive back design meet accessibility guidelines while maintaining sophisticated aesthetics.
LOOMLAN's trade program offers up to 40% off retail pricing with no minimum order requirement, compared to CB2's 25% discount with $1,000 minimum or Arhaus's 30% with $2,500 minimum. Project Concierge services assist with large installations over $5,000, and approval takes just 1-2 business days.
| Specification |
Details |
| Lead Time |
Made to Order -- 4-6 weeks production |
| Contract Grade |
Yes -- engineered to commercial durability standards |
| Commercial Use |
Resort terraces, luxury vacation rentals, senior living outdoor areas |
| Trade Pricing |
Up to 40% off retail -- Apply here
|
| COM |
100+ Sunbrella fabric colors available for full customization |
| Spec Sheet |
Email trade@loomlan.com with SKU 0E14B |
| Volume Orders |
Project Concierge for orders over $5,000 -- trade@loomlan.com | 833-566-6526 |
Complete Specifications
| Specification |
Value |
| SKU |
0E14B |
| Brand/Manufacturer |
Castelle |
| Product Type |
Outdoor Deep Seating Sofa |
| Seating Capacity |
3 Adults |
| Overall Dimensions |
82.5" W x 36.5" D x 39" H |
| Seat Width |
82.5 inches |
| Seat Depth |
28.5 inches |
| Seat Height (with cushions) |
19 inches |
| Arm Height |
25 inches |
| Frame Material |
Welded Extruded Aluminum |
| Frame Finish |
Powder-Coated (20+ colors available) |
| Leg Style |
Sled Base |
| Cushion Features |
Mildew-resistant, antimicrobial, hypoallergenic |
| Fabric Options |
100+ Sunbrella colors available |
| Assembly Required |
Minimal -- cushion placement only |
| Weather Resistance |
All-weather, coastal suitable |
| Country of Origin |
Made in USA |
| Style Classification |
Contemporary |
| Commercial Grade |
Yes |
For detailed specifications on frame finish options and Sunbrella fabric selections, review our comprehensive
Outdoor Sofa Buying Guide or contact LOOMLAN directly.
