Specialist costs: Curtain walling | Features

The following costings are purely indicative. It is advisable to undertake market testing with those specialists seen as most appropriate to the project. It also is critical that specific conditions such as site constraints, client expectations, designers intentions and performance requirements are considered when putting an overall price to a curtain walling system.
Typical design options
	Approximate costs
Cost of each additional frit	£15-20/m2
Extra over cost on system for faceting	10-15%
Extra over cost on system for single radius	60% minimum
Glass external fins, depending on profile	£250-350/m
Aluminium external fins, depending on profile	£100-200/m
Extra over cost for laminated glass in place of toughened	£15-20/m2
Inter-cavity blinds (motorised tilt only, manual raise and lower)	£50-60/m2
Additional layer of glazing (opening inwards for access to cavity)	£90-120/m2
Miscellaneous items
	Approximate costs
Parapets	£250-400/m
Penetrations through system	£1500-2000 each
Single doors	£3500 each
Double doors	£6000 each
External soffits	£400/m2
Interface with other elements ie stone	£250/m
Secondary steelwork	Project-specific