F20Z Spiral Staircase

5-7 weeks delivery

Prices include VAT and mainland UK delivery


Our F20Z spiral staircase is a modern kit external kit stair supplied fully galvanised for protection from the elements. It is formed folded steel plate treads with perforated non slip holes, vertical steel spindles and a PVC handrail supplied in one piece.  There are several diameter to choose from and the system can span floor heights 2100-3600mm.   To allow the stair to blend in better with its surroundings, the flight can be painted on top of the galvanised finish with the choice of black, white, grey or light grey.

Technical Information

ApplicationExternal or Internal Use
Diameters1100mm, 1200mm, 1300mm, 1400mm, 1500mm, 1600mm
TreadsFolded Steel plate with non slip perforations
SpindlesVertical steel 20mm diameter
Handrail42mm diameter Plastic

Top PlatformTriangular
Finish of SteelworkGalvanised
Or galvanised and powder Coated – White, Light Grey, Black or Grey

Steel Finishes

F20Z steel colours

F20 Spiral Rotations


Circular Opening


Square Opening




10 Risers

Clockwise & Anticlockwise


11 Risers

Clockwise & Anticlockwise


12 Risers

Clockwise & Anticlockwise


13 Risers

Clockwise & Anticlockwise


14 Risers

Clockwise & Anticlockwise


15 Risers

Clockwise & Anticlockwise


16 Risers

Clockwise & Anticlockwise

Delivery Information

The F20Z Spiral Staircase is considered a custom made order and is sourced directly to order from the factory in Italy.

Delivery can take between 4 and 6 weeks from order.

As this is a custom made product we are not able to accept cancelations.

Once the staircase arrives in the UK, the haulage company will call you directly to arrange a suitable day for delivery.  The delivery is ‘kerbside’ although most vehicles will have a tail-lift and pump truck so can wheel the staircase to a suitable position across even ground. A signature will be required to accept the goods are in good condition.  The delivery company generally delivers between 8am and 5pm during the week.

Delivery is included to mainland UK destinations.

For Northern Ireland, the Channel Islands, Scottish Isles and Isle of Wight and Isle of Man, please call the office for a door to door shipping cost.

01794 522444    sales@kitstairsystems.co.uk

Frequently asked Questions

Most external spiral staircases tend to fit to a flat surface like a balcony so there is no floor opening to worry about. Should you have an opening then it should be at least 50mm larger than the spiral diameter you are purchasing.   This opening in the floor can be circular or square.  For example a 1500mm diameter spiral would need a 1550mm diameter or 1550 x 1550mm square hole minimum.

This spiral staircase is made to order and is produced in Italy.  Delivery period do fluctuate during the year but are generally set at between 4-6 weeks from order.

The diameter you require will depend on a number of elements.  The application, the opening you have / can have within the floor and building regulations.  If you have building control involved in your project, please check what diameter they require.  Generally speaking, smaller diameters for lower use and larger diameter for more frequent use.

Normally a day for two people is enough to install the staircase.  This of course depends on the competency of the individuals.   Many clients opt to employ a builder/ joiner to install but they can be fitted by an experienced DIYer.

The entry and exit points are a crucial element to any spiral staircase.  This varies a little depending on the diameter and the number of risers you have.  Please see the relationship between the top tread and tread 1 under the rotation tab directly above.

Installation Instructions


Riser Bars

Riser bars can be supplied to reduce the gap between the treads.

Within the UK there is a regulation that states that the gap between the treads cannot be larger than 100mm.  This is to prevent young children slipping through the gap.

The F20Z riser bars consist of a steel bar which is fitted horizontally to the rear of the tread.  This keeps the riser open whilst reducing the gap.

The steelwork is finished the same as the stair.  Galvanised or galvanised and powder coated

These riser bars can be added to the order above.

Please check their requirement with your building inspector.

These can be fitted once the stair is assembled but if they are ordered separately, a delivery charge would be due.


Need some help? Get in touch about our kit spiral stairs.