Panic & Exit Hardware: what shapes the quote

It depends on the pair. Some latch independently and need nothing extra. Where the hardware calls for a set closing order, a coordinator lets the two leaves close in the right sequence, letting the active leaf's device seat properly into a strike carried on the inactive leaf, or into an astragal. Alternatively, the centre mullion can be removed and a vertical-rod device fitted to each leaf, turning the pair into one wide exit. Whichever applies, both leaves are tested working together, not one at a time.

Condition of the existing hardware

A device that only needs adjustment, cleaning and new fasteners costs less in labour than removing a seized or badly worn device and fitting a replacement in its place.

Device family required

A rim device suits many single doors with modest work. A mortise or vertical-rod device, or hardware built to a fire-exit listing, takes more preparation and generally more hardware, which the quote reflects.

Signage and labelling

Any exit signage or alarm labelling the opening needs is a small addition on its own, but it is named in the quote rather than assumed to already exist on the door.