A major London property developer needed an external spiral staircase and horizontal balustrade for a refurbishment in Highbury, North London. The original plan called for a traditional cast iron spiral, but budget constraints led us to design a steel version with chequer plate treads, vertical square spindles, and a flat bar handrail. The project required close collaboration with the builder, architect, and structural engineer to get everything just right.
The platform was made oversized to connect with the upper floor, which was set back from the building’s façade, creating a walkway underneath between the window and the stairs. The landing balustrade’s vertical supports were set 300mm into the coping stone at the end of the upper level, and all steelwork was galvanised and powder coated black at the factory.
Brief
- Design and produce a sleek black staircase to access the balcony
- Supply matching balustrade along the upper walkway
- Set spiral off the building to allow walkway below
- Embed newel posts on the landing 300mm into the coping stone a surround
Summary
- We supplied a galvanised and black spiral staircase
- Matching 15 x 15mm spindles to landing balustrade
- Enlarged top platform pushing stair away from building
- landing balustrade newels supplied oversized to allow for fixing below finished level
Outdoor Spiral Staircase Highbury – Technical Specifications
| Floor to floor height | 2742mm |
| Risers | 14 @ 195.8mm |
| Spiral Diameter | 1600mm |
| Clear Tread Width | 650mm |
| Tread Type | Chequer plate steel |
| Balustrade Type | Vertical 15 x 15mm steel spindles |
| Handrail | 45 x 8mm Steel |
| Centre Column | 140mm Ø |
| Finish of Steel | Galvanised and Powder Coated |
| Additional | Landing Balustrade to match |
CONTRIBUTORS TO
