Calgary Spiral Staircase
At a Glance
Floor-to-Floor Heights: 2.45 m – 2.81 m
Number of Treads: 12 (11 treads + landing platform)
Tread Material: Multiplex wood with beech veneer
Structure Material: Powder-Coated Steel
Stair Diameter Options: 120 cm or 140 cm
Minimum Floor Opening Length: 1250 mm
Minimum Floor Opening Width: 1250 mm
Maximum Point Load: 200 kg
Maximum Surface Load: 620 kg
Use Type: Domestic
Certified to: EN 1991 & EN 1993
Meets UK Building Regulations: No — optional upgrades available
Guarantee: Lifetime Guarantee
Full Product Overview
The Calgary Spiral Staircase is a contemporary space-saving staircase designed for domestic interiors where efficient vertical access and modern styling are equally important. Ideal for loft conversions, mezzanine floors and upper-level access, its compact spiral design reduces floor space usage while still delivering comfortable everyday usability.
Available in either a 120 cm or 140 cm diameter, the Calgary staircase allows homeowners to choose between a tighter footprint for smaller spaces or a larger walking area for improved comfort. The 140 cm option offers noticeably wider tread space, making it particularly suitable for more frequent daily use.
Constructed from powder-coated steel and fitted with durable 35 mm thick varnished beech multiplex treads, the staircase combines structural strength with a refined architectural appearance. The clean steel framework is available in White (RAL 9016) or Grey (RAL 9006), helping it integrate easily into both contemporary and traditional interiors.
Its adjustable rise system allows installation across floor-to-floor heights from 2.45 m to 2.81 m by adjusting tread spacing or removing treads where necessary. This provides flexibility during installation while maintaining consistent climbing comfort.
Tested to a 620 kg total surface load and a 200 kg point load, the Calgary Spiral Staircase is engineered to meet EN 1991 and EN 1993 structural standards for dependable long-term domestic performance.
Optional riser bars and additional middle banister packs are also available for projects requiring enhanced compliance with UK Building Regulation requirements.
Sizes & Dimensions
| Specification | 120 cm Diameter | 140 cm Diameter |
|---|
| Stair Diameter | 120 cm | 140 cm |
| Tread Width | 627 mm | 727 mm |
| Floor-to-Floor Height | 2.45 m – 2.81 m | 2.45 m – 2.81 m |
| Adjustable Rise | 20.4 cm – 23.4 cm | 20.4 cm – 23.4 cm |
| Number of Treads | 12 | 12 |
| Tread Thickness | 35 mm | 35 mm |
| Minimum Floor Opening | 1250 mm × 1250 mm | 1250 mm × 1250 mm |
| Maximum Point Load | 200 kg | 200 kg |
| Maximum Surface Load | 620 kg | 620 kg |
Always measure your finished floor-to-floor height and floor opening carefully before ordering.
Key Benefits
Two staircase diameter options
Choose 120 cm for tighter spaces or 140 cm for improved walking comfort.
Adjustable floor height system
Designed for floor-to-floor heights between 2.45 m and 2.81 m.
Customisable tread rise
Adjustable tread spacing allows more tailored installation.
35 mm beech multiplex treads
Varnished timber treads provide durability and refined appearance.
Powder-coated steel structure
Strong steel framework available in White or Grey finishes.
Compact spiral footprint
Ideal for loft conversions and mezzanine access where space is limited.
Certified structural performance
Tested to 620 kg surface load and 200 kg point load capacity.
Optional compliance upgrades available
Riser bars and additional banister packs can support UK Building Regulation requirements.
Final Verdict
The Calgary Spiral Staircase combines compact space-saving design with premium materials, certified structural strength and flexible installation options.
With two diameter choices, adjustable rise configuration, durable beech multiplex treads and a Lifetime Guarantee, it provides a stylish and dependable solution for lofts, mezzanines and modern domestic interiors where efficient access and contemporary design are essential.
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