Sigma Spiral Staircase – Premium Form Meets Architectural Function

The Sigma Spiral Staircase by DOLLE is where sculptural elegance meets safe, practical design. Finished in laminated beech and lacquered grey steel, it’s built for modern homes that demand both beauty and substance. With a maximum landing height of 309cm and adjustable risers for perfect installation, Sigma is a statement staircase that balances architectural presence with ease of use.

Available in 120cm and 140cm diameters, the Sigma spiral staircase takes up remarkably little space, making it perfect for contemporary interiors, loft access, or as a secondary staircase between levels where floor space is at a premium.

✅ Key Features – Sigma Spiral Staircase

• ✅ Max floor-to-floor height: 309cm

• ✅ 12 solid beech treads + triangular landing platform

• ✅ Adjustable risers from 19cm to 23.5cm

• ✅ Tread thickness: 38mm lamellar lacquered beech

• ✅ Available in 120cm or 140cm diameters

• ✅ Grey lacquered steel banister (RAL 9006) with 4 balusters per tread

• ✅ Matte finish powder-coating for structure and balustrade

• ✅ Sculptural, space-saving spiral layout

• ✅ No special tools required for assembly

• ✅ Optional matching landing banister available

• ✅ Compliant with EN 1991 & EN 1993 European building standards

• ❌ No plastic or MDF components

• ❌ No awkward angles or limited adjustments

• ❌ No compromise on safety or design finish

🔍 Sigma vs. Standard Spiral Staircases – Premium at Every Turn

🏡 A Sculptural Centrepiece with Minimal Footprint

The Sigma staircase is as much a visual centrepiece as it is a structural solution. It’s perfect for:

• �  Modern open-plan living areas

• 🛋️ Split-level loft conversions

• 🏢 Studios, galleries, and offices

• 📐 Tight spaces where every centimetre counts

The staircase is designed for quick installation with lightweight, durable components. With 12 treads and a matching triangular landing, plus included spacer rings for tailored riser height, you’ll get a staircase that fits beautifully and performs exceptionally.

A minimum ceiling opening of 125cm x 125cm (for the Ø120cm model) is all you need. For the 140cm option, allow 10cm additional clearance.

🚚 Standard UK Delivery – Fast, Secure & Reliable

We ensure every Sigma staircase is delivered with care:

• ✅ Free Standard UK Mainland Delivery

• ✅ Dispatched and delivered in 5–15 working days

• ✅ Flat-packed for easy transport and assembly

• ✅ Includes fixings, installation guide & hardware

💳 Flexible Payment Options – Safe & Hassle-Free

Choose how you’d like to pay:

• ✅ Pro Forma Invoicing – for schools, trades & businesses

• ✅ Klarna – Pay in 3 or later (subject to approval)

• ✅ PayPal – trusted, quick, and secure

• ✅ Credit & Debit Cards – all major providers accepted

• ✅ Apple Pay – fast, one-click mobile checkout

🏆 Our Verdict – Bold Design, Seamless Functionality

The Sigma Spiral Staircase is an exceptional choice for discerning homeowners and designers. With its solid timber treads, sculptural steel structure, and flexible configuration, Sigma delivers top-tier style, comfort, and functionality in one easy-to-install package.

👉 Order your Sigma Spiral Staircase today from Ladders UK Direct – where style climbs to new heights.