Short answer: the price depends mostly on three things: whether it's framed or frameless, how many custom cuts or notches the glass needs, and the hardware finish you choose. Size matters less than most people expect once you're past a standard stall.
The three real cost drivers
Glass thickness and style is the biggest lever — frameless costs meaningfully more than framed because of both material and labor. After that, any non-standard shape (a neo-angle, a knee wall, an odd ceiling slope) adds custom fabrication time, which shows up directly in the quote.
Hardware finish is the smallest driver but the easiest to overspend on. Chrome and brushed nickel are the baseline; matte black and brushed brass usually carry a premium simply because they're less common stock items.
Where quotes vary the most
Two companies quoting the same door can land far apart if one is padding the frameless labor estimate or using a lower-grade glass supplier. Always ask what glass thickness and brand of hardware is included — vague quotes ("shower door install") without those specifics are the ones most likely to balloon later.
What actually saves you money
Sticking to a standard rectangular opening, choosing chrome or nickel hardware, and going framed if the bathroom is a rental or you're selling within a few years — all genuinely reduce cost without a compromise you'll regret.
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