1100mm Milano C20 Plus Spiral Staircase


The Milano C20 Plus features powder coated steel vertical spindles and beautiful solid beech treads and segmented beech handrail.

Available in six diameters – 1100mm, 1200mm, 1300mm 1400mm, 1500mm and 1600mm to suit your project. PLEASE NOTE THIS PAGE IS FOR THE 1100mm DIAMETER. You will find separate product pages for the other diameters.

There are four colour choices for the powder coated steel – White, Light Grey, Black and Dark Grey and the brushed solid beech treads and segmented handrail are available in the following colour treatments – Oak, Walnut, Stone and Wenge. Matching accessories: balustrading for the stairwell and riserbars to fit between the treads.

Please select the number of treads and your colour choices from the drop down boxes below. (You can double-check the number of treads to order in the tab below labelled “How Many Treads Do I Need?”)

And all of this is delivered to your door in carefully manufactured components ready for straight forward installation by any competent DIYer or tradesperson. (Installation instructions are included!)

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Milano C20Plus Spiral Staircase Description

Manufacturer :: D’Opera, Italy
Model Name :: Milano C20Plus Made To Order
Format :: Spiral – Kit Format
Diameters :: 1100mm, 1200mm, 1300mm, 1400mm, 1500mm, 1600mm
Rotation :: Clockwise or AntiClockwise (you decide at installation)
Tread Colour Options :: Pigmented Oil and Hard Wax finish Oak, Walnut, Stone or Wenge
Steel Colour Options :: White, Light Grey, Black, Dark Grey
Number of Treads :: 10-16 including triangular landing tread (depending on the order)
Number of Risers :: 11-16 (depending on the order)
Tread Type :: 40mm thick Solid Laminated Beech with Brushed Finish
Balustrade Type :: Powder Coated Steel round baluster spindles 20mm diameter
Handrail Type :: Segmented beech colour matched to treads
Installation Video :: No
Warranty Period :: Two Years.
Installation Instructions :: Click here to download the C20 Plus Installation Instructions


important-button-icon-thN.B. This staircase is carefully designed and manufactured in Italy and is a certified product CE European Technical Approval – ETA. However, European staircase regulations differ from those in the UK, in particular about the maximum tread rise. You will find details of the UK Building Regulations (Part K) in our Knowledge Centre Page. Please give us a call if you would like further advice.

PLEASE NOTE: It is your responsibility to ensure that any Local Authority approvals necessary have been obtained. This will vary according to your application and we advise you to always check before going ahead with a purchase.

The delivery takes approx 4-5 weeks (and delivery to UK mainland and customs processing costs are included).

Steel Colours Wood Colours
White Oak
Light Grey Walnut
Black Stone
Dark Grey Wenge

(Click colour options for larger image)

Additional information

Steel Colour

White, Light Grey, Black, Dark Grey



Tread Colour

Oak, Walnut, Stone, Wenge

Floor to floor height

210-220cm 10 treads, 231-242cm 11 treads, 252-264cm 12 treads, 273-286cm 13 treads, 294-308cm 14 treads, 315-330cm 15 treads, 336-352cm 16 treads

Installation Instructions

pdf-iconInstallation Instructions Download here


Landing Installation options:

Circular Opening

Mezzanine Opening

Square Opening

Tread Geometry
Landing Tread Dimensions:
 Milano C20 Riserbars
C20 1100mm Tread Geometry


pdf-iconC20 1100mm Landing Tread Dimensions


Tread Layout Diagrams
Showing Clockwise and Anti-clockwise Ascent

10 treads/risers

11 treads/risers

12 treads/risers 

13 treads/risers

14 treads/risers

15 treads/risers

16 treads/risers


How many treads do I need?

How to calculate the number of treads

For your finished floor to floor height in mm:

UK Regulations EU Regulations Number of Treads
2100-2200mm 2100-2300mm 10 treads/risers
2310-2420mm 2310-2530mm 11 treads/risers
2520-2640mm 2520-2760mm 12 treads/risers
2730-2860mm 2730-2990mm 13 treads/risers
2940-3080mm 2940-3220mm 14 treads/risers
3150-3300mm 3150-3450mm 15 treads/risers
3360-3520mm 3360-3680mm 16 treads/risers

This table shows the individual tread rise range which can be installed for this staircase, from the minimum (210mm) to the maximum (230mm).

This staircase is carefully designed and manufactured in Italy and is a certified product CE European Technical Approval – ETA. However, European staircase regulations differ from those in the UK, in particular about the maximum tread rise. Please note that UK regulations require a maximum tread rise of 220mm and the table above will show how many treads you would need for the UK or EU.

Just to explain how the individual tread rise is adjusted, each tread rise section comprises the centre column (part no. C20-300) with a rigid plastic shim (C20-295) set into each end of the column. This results in a tread rise of 210mm. To increase the tread rise, additional shims are added at either end of the column, which will increase the tread rise by 5mm for each one, as shown in the following diagrams.


If you’re unsure about how this works for your project, or have any questions, please give us a call.