A Guide to Buying a Spiral Staircase
The opening in the ceiling for a spiral should ideally exceed the total diameter of the stair being placed in it by 100mm. So, if a 1600mm diameter spiral is being installed, a circular opening of 1700mm or more would be necessary, allowing 50mm on either side of the staircase.This is to allow the 50mm "knuckle gap" as a person climbing the stair moves their hand along the handrail. Spiral stairs are available to suit many budgets; kit ones can begin at £800 or so, whilst top of the line bespoke spirals, in oak or with stainless steel centre columns, can reach upwards of £9000. In general, if looking for a small secondary access stair, budgeting £1800-£1900 should be sufficient unless it is passing over 3000mm in height, and for a main staircase, a budget of around £5000-£6000 should cover the more popular options in terms of material and style. To purchase a spiral, the important dimensions to know are: - The floor to floor height - The diameter of the staircase - The dimensions of the opening in the ceiling (if applicable) Important building regulations to be aware of when selecting a spiral staircase include the 100mm gap rule, which states that clear distances on the staircase (such as between the spindles of the balustrade) may not be more than 100mm wide. This also applies to the risers - or gaps underneath each tread - which are normally supplied with a riser bar to fit across the gap, thereby enclosing it sufficiently. The other critical regulation is in regards to clear tread width, which was touched on above.
Contrary to popular belief, a 1600mm diameter spiral does not have the required 800mm clear tread width, as the diameter of this spiral includes both the centre column width (normally 120-150mm) and the handrail to either side of the stair (40-50mm).
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