Curtain wall cost factors are best understood through the complete facade scope. A square-metre rate may omit anchors, perimeter work, access equipment or project-specific engineering. Begin with coordinated drawings and a responsibility schedule so each bidder is pricing the same building interfaces.

Define system and assembly method

Identify whether the proposal is site assembled, factory assembled or another defined approach. System depth, module layout, opening vents and corner details affect the component package. Ask the supplier to state the system reference and assembly assumptions rather than offering a generic curtain wall price.

Repeated modules may differ from numerous unique corners and transitions. Provide elevations showing the actual divisions and special conditions. A simple rectangular sample area may not represent the cost of a facade with terraces, setbacks and several adjoining materials.

Glass and performance requirements

Record the full glass construction, coatings, appearance requirements and relevant project performance criteria. Large or unusual panes may affect fabrication, handling and replacement planning. Ask which calculations, reports and proposed tests are included.

Clarify whether a visual or performance mock-up is required and who provides it. A mock-up, laboratory test or site test should be a defined scope item with agreed acceptance criteria, not an assumption hidden behind a unit rate.

Allocate interfaces and site responsibilities

List anchors, brackets, slab-edge treatment, perimeter seals, flashing and connections to adjacent cladding. Identify who designs, supplies and installs each element. Missing boundaries can produce competing quotations that appear similar while leaving different parts of the building unfinished.

Review lifting access, scaffold or other access equipment, storage and installation sequence. A facade delivered in large units needs a suitable handling strategy. Site tolerances and survey information should be available before manufacture is released.

Compare cost by work package

• Framing, glass, vents and accessories.
• Engineering, drawings, samples and testing.
• Anchors and adjoining-building interfaces.
• Packing, delivery, storage and lifting.
• Installation, sealing, inspection and making good.

Ask every bidder to identify provisional quantities, exclusions and alternative assumptions. Compare the same drawing revision and areas. If an alternative system is proposed, review its structural, weathering and installation consequences before treating the difference as a saving.

Explore Shanghai Slang curtain wall options alongside window wall in architectural products. Send elevations, typical sections, project criteria and scope boundaries to request a coordinated proposal. The meaningful budget is for the agreed facade package, not a bare rate detached from the building.