A shower door or shower screen should be chosen from the finished opening, not the rough construction opening. Measure after tile, wall panels, back walls, and the threshold surface are complete so the product size matches the space the glass will actually fit.
Quick answer
Measure the finished opening width at the top, middle, and bottom. Then compare the narrowest measurement with the adjustable range on the product page. Also check height, wall plumb, threshold depth, and whether the door needs swing clearance.
What to measure first
| Finished width | Measure left to right at the top, middle, and bottom of the opening. |
| Finished height | Measure from the threshold or tub ledge to the intended top of the glass or frame. |
| Wall and threshold | Check plumb, level, threshold depth, and whether the mounting surface can support the hardware. |
For sliding and bypass shower doors
Sliding and bypass doors usually list an adjustable width range. Your finished opening should fall inside that range. If the product notes mention trimming a guide rail or track, plan the installation around the listed adjustment method and do not choose a size outside the stated range.
For pivot, fold, and swing shower doors
Measure the opening the same way, then check the door path. A hinged or pivoting panel may need space around the shower entrance. Also review whether the door can be installed left or right, and whether the product page lists any wall or threshold requirements.
For fixed and walk-in shower screens
Walk-in screens are more open than enclosed doors, so placement matters. Confirm the glass width, height, support bar or wall-mounting requirements, and the direction of water flow in the shower area.
Delivery and installation notes
- Glass shower doors and screens are bulky items; check site access before ordering.
- Inspect packaging before installation.
- Use the product page's exact dimensions and fit notes as the final reference.
- Professional installation is recommended if you are not comfortable handling large glass panels.
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