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Survey the openings
Check existing construction, damage, lintels and sill details before ordering. Agree the dimensions and opening arrangements with the installer rather than relying on informal measurements alone.
Include glazing and connections
Specify glass, ventilation, hardware and the intended performance. The connection to the surrounding wall must address water, air leakage and insulation as appropriate to the design.
Clarify making good
Removal, waste handling, internal reveals, external finishes and decoration may be separate items. Inspect operation and junctions at handover and record maintenance and warranty information for the supplied products.