Stair geometry
Bespoke widths, irregular pitches or winding forms typically increase the rate by 15–35% through additional mould and reinforcement requirements.
Finish standard
Fair-faced soffits, controlled colour and high-quality exposed edges can add £2,500–£6,000 per staircase.
Crane provision
A dedicated mobile crane and lifting team generally adds £2,000–£5,000 per visit, with higher allowances for large-radius lifts.
Bearing details
Proprietary connectors, thermal breaks, acoustic pads or heavily reinforced support zones can add £1,000–£3,500 per staircase.
Delivery constraints
Timed deliveries, urban restrictions or abnormal-load arrangements commonly add 5–15% to the supply-and-install rate.
Repetition and volume
Reuse of standard moulds across five or more identical staircases can reduce unit rates by approximately 8–18%.