Sliding glass doors

A sliding glass door is a multi-panel unit where one or more panels roll on a bottom track while others stay fixed. Sizing is driven by the overall width and the panel count, with each panel marked O (fixed) or X (operating) — for example a 3-panel OXO has a center panel that slides past two fixed ends. These are heavy, labor-intensive units: budget roughly 4 crew-hours per panel plus a separate screw-inspection return trip before the trim covers go on. Because the work scales with panels, sliders are priced per panel, not per linear foot.

Panel configuration sets width, price and which way the glass moves.

Labor: ~4 crew-hours per panel
Pricing: per panel (not per LF)
Buck pieces: 3 (head + 2 jambs, NO sill)
Jamb cut: each jamb −1.5" (door rule)
Extra trip: 1 screw inspection before covers go on
Config example: 3-panel OXO = 2 fixed + 1 operating

Configuration is written in O/X notation: O = fixed (stationary) panel, X = operating (sliding) panel. Common layouts are OX, XO, OXO and OXXO — read left to right as you face the door.
The bottom track IS the sill, so the buck is only 3 pieces: a head and 2 jambs. Sliding glass doors and bifolds follow the door rule — jambs are cut −1.5" (windows are −3" because they also get a sill).
Plan the screw-inspection trip into the schedule: anchors must be seen and signed off before the head/jamb covers are installed, or you'll be pulling covers back off later.
Masonry-opening math is the same as any unit: from a nominal size add 3.5", from a labeled R.O. add 3.0", and a labeled M.O. is used as-is; the finished hole is the door plus 1/2" shim space.

Pros

Priced per panel, so a wider unit with the same panel count doesn't blow up the quote like LF pricing would
Only 3 buck pieces (no sill) — fewer cuts and the track does double duty as the sill
O/X notation makes the operating layout unambiguous on the order and on site

Watch-outs

Heavy labor: ~4 crew-hours per panel adds up fast on 3- and 4-panel units
Requires a dedicated screw-inspection return trip before covers — easy to forget when scheduling
Glass and frames are heavy and awkward; setting and shimming the track level is critical for smooth operation

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