Trimax® Gardentop Staircase – Anthracite Outdoor Staircase
✅ Durable outdoor modular staircase system designed for safe, weather-resistant access between levels in gardens, patios, decking and terraces.
🚚 FREE UK Mainland Delivery (3–5 Days) — tracked delivery included.
Hot-dip galvanised steel frame with anthracite TRIMAX® fibreglass-reinforced anti-slip treads — built for strength, safety, and season-proof performance.
At a Glance
Structure material: Hot-dip galvanised steel — weather resistant and long-lasting.
Tread material: TRIMAX® fibreglass-reinforced composite with anti-slip perforations.
Tread depth: 220 mm — deep, secure step surface.
Tread thickness: 40 mm — robust and load-bearing.
Floor-to-floor height range: 36 cm to 264 cm (modular config from 2 up to 12 treads).
Maximum load: 200 kg total stair load capacity.
Width options: 800 mm & 1000 mm tread widths available.
Use Type: Outdoor access stair system.
Guarantee: Lifetime Guarantee.
Key Benefits
Modular Outdoor Staircase
Fully configurable range from 2 to 12 treads — choose the number that matches your floor-to-floor height and terrace access requirements.
Durable & Weather-Proof
Hot-dip galvanised steel structure is highly resistant to rain, frost, heat and outdoor elements.
TRIMAX® Anti-Slip Treads
Fibreglass-reinforced composite treads with perforations provide confident grip even in wet conditions.
Wide Step Surface
220 mm deep treads deliver comfortable footing and practical use for everyday outdoor access.
Lifetime Guarantee
Built to last with industry-leading materials and backed by a Lifetime Guarantee for peace of mind.
📏 Sizes & Dimensions
| No. of Treads | Min Floor-to-Floor Height (m) | Max Floor-to-Floor Height (m) | Tread Depth (mm) | Tread Thickness (mm) | Staircase Width (mm) |
|---|
| 2 Tread | 0.36 m | 0.44 m | 220 mm | 40 mm | 800 / - 1000 mm |
| 3 Tread | 0.54 m | 0.66 m | 220 mm | 40 mm | 800 / - 1000 mm |
| 4 Tread | 0.72 m | 0.88 m | 220 mm | 40 mm | 800 / - 1000 mm |
| 5 Tread | 0.90 m | 1.10 m | 220 mm | 40 mm | 800 / - 1000 mm |
| 6 Tread | 1.08 m | 1.32 m | 220 mm | 40 mm | 800 / - 1000 mm |
| 7 Tread | 1.26 m | 1.54 m | 220 mm | 40 mm | 800 / - 1000 mm |
| 8 Tread | 1.44 m | 1.76 m | 220 mm | 40 mm | 800 / - 1000 mm |
| 9 Tread | 1.62 m | 1.98 m | 220 mm | 40 mm | 800 / - 1000 mm |
| 10 Tread | 1.80 m | 2.20 m | 220 mm | 40 mm | 800 / - 1000 mm |
| 11 Tread | 1.98 m | 2.42 m | 220 mm | 40 mm | 800 / - 1000 mm |
| 12 Tread | 2.16 m | 2.64 m | 220 mm | 40 mm | 800 / - 1000 mm |
Choose the correct configuration to safely overcome your specific vertical height — ensure the system you build matches your finished floor levels.
How Does It Compare?
| Feature | Trimax® Gardentop Staircase (Anthracite) | Standard Garden Stairs |
|---|
| Modular Configuration | ✔ 2–12 treads | ✘ Often fixed height |
| Anti-Slip Treads | ✔ TRIMAX® composite | ✘ Basic timber or steel |
| Weather-Resistant | ✔ Hot-dip galvanised | ✘ Lower corrosion resistance |
| Load Capacity | ✔ Up to 200 kg | ✘ Typically lower |
| Lifetime Guarantee | ✔ Yes | ✘ Varies |
This comparison highlights how the Gardentop system delivers durability, flexibility and safer use versus basic outdoor stair options.
Full Product Overview
The Trimax® Gardentop Staircase – Anthracite is a premium outdoor staircase solution engineered for modular height adjustment, robust performance and long-lasting reliability. With choices from 2 up to 12 treads, it delivers a tailored fit to floor-to-floor heights from 0.36 m up to 2.64 m.
Its hot-dip galvanised steel frame ensures strong, corrosion-resistant structural integrity, while the fibreglass-reinforced TRIMAX® treads offer anti-slip performance that’s safe even in wet conditions. Whether linking decking to garden, a patio to lawn, or a balcony to yard, this straight-flight staircase strikes a perfect balance between functionality and modern style — all backed by a Lifetime Guarantee.
Safety & Build Details
Hot-dip galvanised steel frame for enhanced outdoor durability.
TRIMAX® fibreglass-reinforced anti-slip treads for confident footing.
Modular height range to suit multiple floor-to-floor heights.
Wide tread surface (220 mm) for comfort and safety.
Lifetime Guarantee included for peace of mind.
Final Verdict
The Trimax® Gardentop Staircase – Anthracite range delivers robust outdoor access with excellent adaptability, weather resistance and modern aesthetics. Its modular design allows easy customisation to exact height requirements while providing reliable performance for daily use. A lifetime guarantee adds confidence, making this staircase an outstanding choice for both residential and commercial outdoor projects.
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