Foundation type
Root fixing with excavation and concrete generally adds £50–£100 each compared with bolting to a suitable existing slab.
Surface reinstatement
Cutting and matching existing paving can add £60–£150 each, with higher allowances for natural stone or specialist finishes.
Material finish
Powder coating typically adds £30–£70 each, while stainless steel can increase the complete rate by 70–100%.
Order quantity
Runs of fewer than ten stands may carry a 15–30% premium because delivery, supervision and mobilisation are spread over limited units.
Site access
Restricted working hours, pedestrian segregation or hand-carried materials can increase installation costs by 20–40%.
Service risk
Scanning, trial holes and hand excavation around buried services can add £40–£120 each depending on congestion and permit controls.