Sigma Spiral Staircase

Sigma Spiral Staircase

At a Glance

Use Type: Domestic

Structure Material: Powder-Coated Steel

Tread Material: Laminated Beech

Tread Finish: Varnished

Tread Thickness: 38 mm

Adjustable Tread Rise: 190 mm – 235 mm

Floor-to-Floor Height Range: 2470 mm – 3055 mm

Staircase Diameter Options: 1200 mm or 1400 mm

Minimum Floor Opening Length: 1250 mm

Minimum Floor Opening Width: 1250 mm

Maximum Point Load: 200 kg

Maximum Surface Load: 620 kg

Building Regulation Compliance: Yes

Guarantee: Lifetime Guarantee

Full Product Overview

The Sigma Spiral Staircase is designed to combine premium materials, compact efficiency and contemporary architectural styling for modern domestic interiors.

Featuring a robust powder-coated steel structure paired with 38 mm thick laminated beech treads, the Sigma creates a refined and durable staircase solution ideal for loft conversions, mezzanine floors and compact upper-level access. Its spiral design helps minimise floor space usage while still providing safe and comfortable everyday access between levels.

The staircase is available in both 1200 mm and 1400 mm diameter options, allowing flexibility depending on the available space and desired walking comfort. The larger 1400 mm version offers a wider walking line and enhanced ease of use for more frequent access applications.

An adjustable rise system allows tread spacing to be configured between 190 mm and 235 mm, enabling accurate installation across floor-to-floor heights ranging from 2470 mm to 3055 mm.

Certified to EN 1991 and EN 1993 structural standards, the Sigma Spiral Staircase is tested to a 620 kg total surface load and 200 kg point load, delivering dependable long-term domestic performance.

The integrated balustrade system with multiple balusters per tread enhances both safety and visual appeal, creating a staircase that functions as both an access solution and a modern design feature.

Sizes & Dimensions

Always measure your finished floor-to-floor height and floor opening before ordering.

Key Benefits

Compact spiral staircase design
Ideal for interiors where space is limited but comfortable access is still required.

Premium laminated beech treads
38 mm thick varnished treads provide durability and a high-quality finish.

Adjustable rise configuration
Allows accurate installation across a range of floor heights.

Modern powder-coated steel structure
Strong, durable and designed to complement contemporary interiors.

Two diameter options available
Choose 120 cm for compact spaces or 140 cm for increased walking comfort.

Integrated balustrade system
Multiple balusters per tread improve both safety and visual appeal.

Strong structural performance
Tested to 620 kg surface load and 200 kg point load capacity.

Suitable for lofts and mezzanines
A practical access solution with strong architectural presence.

Final Verdict

The Sigma Spiral Staircase combines premium laminated beech treads, structural steel construction and compact spiral efficiency to create a stylish and dependable domestic staircase solution.

With adjustable installation height, dual diameter options and certified structural performance, it delivers both modern design appeal and reliable everyday access — all backed by a Lifetime Guarantee.