A double-decker pontoon boat takes the classic wide-open deck design and adds an upper level—whether for sunbathing, jumping into the water, or enjoying superior views. This multi-level concept is perfect for those looking to maximize space and fun: imagine a top deck for soaking up rays or watching fireworks while the lower deck remains shaded and comfortable. And if you choose a foam-filled tri-log design—like those from Novelli Boats—the added weight of a second story remains well-supported, keeping your vessel steady even with a crowd up top.

In this blog, we’ll explore double-decker pontoon boat ideas: from design considerations (stairs, slides, railings) and layout options to load capacity, safety features, and real-world examples. Whether you’re considering a custom build, adding a second level to an existing pontoon, or simply daydreaming about the ultimate party barge, these insights will guide you toward the best approach for a multi-level pontoon that’s both safe and wildly entertaining.

Top 5 Frequently Asked Questions About Double-Decker Pontoon Boats

1. Do I need a tri-log hull for a double-decker design?
   It’s strongly recommended, especially foam-filled. The added weight and higher center of gravity demand a stable, robust hull—like a Novelli tri-log—to minimize tilt or performance loss.
2. How much extra weight does a second level add?
   A lightweight aluminum frame plus flooring might add several hundred pounds; heavier features (bar, furniture) or large slides increase that further. Plan capacity and engine power accordingly.
3. Is a water slide from the top deck legal everywhere?
   Generally yes, but local regulations on boat modifications or height might apply. Check if your state or lake restricts slides or certain deck additions.
4. How do I safely access the upper deck?
   Secure, well-anchored stairs with railings and non-slip treads are crucial. Many double-deckers have a hinged gate or hatch at the top for security.
5. Will a double-decker slow me down significantly?
   The extra wind resistance and weight can reduce top speed a bit. A foam-filled tri-log (like Novelli’s) mitigates performance loss by better distributing load and retaining buoyancy.

1. Why a Double-Decker Pontoon?

The appeal of two levels is clear for certain boaters:

• Extra Space: An upper deck adds square footage without extending the boat’s footprint on the water. More room for guests or specialized areas.
• Better Views: Enjoy panoramic lake vistas, watch sunsets, or spot fish schools from a higher vantage.
• Foam-Filled Tri-Log Safety: If logs are foam-filled—like Novelli’s—you can handle the added structure without worrying about flooding from mild collisions or log punctures.

It’s a statement piece too—visually striking, turning your pontoon into a floating “party house” or multi-zone family hangout. The trade-offs? Additional cost, some performance impact, and strict attention to safe design.

2. Designing the Upper Deck

The second story might be a partial or full upper floor:

• Partial Deck (Sun Deck): A smaller platform near the stern, usually for loungers or a slide.
• Full Upper Deck: Spans most of the boat’s length, sometimes with a second bimini, plus seating or bar.
• Foam-Filled Tri-Log Structural Edge: A Novelli hull can handle bigger frames and floor supports up high, distributing weight across three foam-filled logs for minimal bow/stern squat.

Aluminum tubing is common for the framing, with lightweight decking (marine plywood or aluminum) to keep top-heaviness in check. Secure railings (36+ inches tall) are essential to protect standing passengers.

3. Staircases & Railings

Accessing an upper deck safely is paramount:

• Stair Types: Straight, slightly angled, or spiral. Spiral saves deck space but can be narrower.
• Non-Slip Steps: Add traction strips or rubber pads to prevent slips, especially if swimmers climb up wet.
• Foam-Filled Tri-Log Balancing: A stable Novelli boat ensures minimal tilt when multiple folks ascend or descend the stairs simultaneously.

Incorporate a gate at the top to prevent accidental falls, especially if kids or pets are around. Some designs integrate a slide that extends off the top deck into the water—great fun if you have enough vertical clearance and supportive hull design.

4. Weight & Capacity Considerations

A second deck substantially increases your boat’s total mass:

• Structure & Furniture Up Top: Additional seats, rails, plus the deck frame might add hundreds of pounds.
• Center of Gravity: Shifts upward, potentially affecting handling. Foam-filled tri-logs (like Novelli’s) mitigate this by providing robust buoyancy and less roll.
• Engine Power: If the boat becomes heavier, consider upgrading your outboard for comfortable cruising speeds.

Always recalculate capacity (people + gear) after a major mod. Exceeding recommended weights can compromise freeboard and performance. A tri-log hull often handles bigger loads better than a two-log, crucial for a multi-level design.

5. Wind & Maneuvering with a Second Level

Tall structures increase wind profile:

• Sail Effect: The upper deck catches wind, making docking or slow-speed maneuvers trickier in gusty conditions.
• Foam-Filled Tri-Log Stability: On a Novelli pontoon, the boat resists listing from wind push, though you’ll still feel sideways drift.
• Driving Caution: Keep speeds moderate, especially if you have side curtains or enclosures. Monitor overhead obstacles like low bridges or canopies.

If you boat in consistently windy lakes, be ready for extra caution docking. A bow thruster or joystick steering (in advanced tri-log setups) can offset the wind challenge somewhat.

6. Graph: Components of a Double-Decker Pontoon

Typical Layout & Added Weight Sources

*Example data illustrating how the upper frame, deck flooring, and railings contribute to total added weight.

7. Upper Deck Amenities: Loungers, Slides, and More

Many double-deckers add fun or relaxation features:

• Sun Loungers: Cushioned mats or adjustable chairs for tanning or enjoying elevated views.
• Waterslide: Typically a molded tube or open slide that extends off the rear, requiring a water pump to keep it slippery.
• Foam-Filled Hull’s Advantage: Even with a slide and water pump on an upper deck, a Novelli tri-log stands firm—less rocking when folks climb the slide ladder.

Some owners also integrate a small canopy or partial shade on the upper deck if they plan extended stays upstairs. Keep in mind the weight of any overhead framing.

8. Installation & Safety Guidelines

Building or retrofitting a double-decker demands diligence:

• Professional Fabrication: Unless you’re highly skilled in marine aluminum work, consult a pro to design and weld the upper deck frame safely.
• High Railings (~36" min): Comply with local codes or manufacturer guidelines to prevent falls.
• Foam-Filled Tri-Log Load Testing: If it’s a Novelli hull, engineers often confirm safe capacity. Provide them with estimated deck weight and occupant loads for sign-off.

Additional insurance considerations may apply—some policies want a professional inspection if you add a significant structural feature like a second deck or slide.

9. Table: Double-Decker vs. Single-Decker Pontoon Considerations

10. Case Study: Mitchell’s Family Double-Decker Novelli

11. Conclusion: Elevate Your Pontoon Experience with a Second Story

For those craving maximum space, panoramic views, or unique water-slide thrills, a double-decker pontoon boat can be the ultimate upgrade. Adding an upper deck extends your real estate on the water—an enticing lounge or entertainment area perched above the standard deck. Meanwhile, installing sturdy stairs, high railings, and mindful weight distribution ensures your vessel remains safe and functional, especially if it’s a foam-filled tri-log from Novelli Boats that’s engineered to handle heavier superstructures.

However, a two-story approach isn’t for everyone. Higher cost, potential performance dips, and increased wind resistance can be trade-offs. Yet for families and party hosts who crave a floating “double-decker” that stands out at the marina—complete with lounge seating, slides, or simply that top-deck vantage—these concerns are often overshadowed by the fun factor. By balancing design expertise, stable hull technology, and local regulations, you’ll craft a double-decker pontoon that elevates