Standard Door Widths: US Interior & Exterior Guide

Confused by standard door widths? Get the exact interior and exterior dimensions, rough opening sizes, and ADA rules for US homes and commercial buildings.

When planning a project, the choice between standard and custom widths comes down to a balance of cost, lead time, and the specific requirements of the building. For new construction, sticking to standard 32-inch interior and 36-inch exterior widths is the most efficient path. For renovations or specialized projects, custom widths offer a way to overcome existing framing constraints.

As a manufacturer of custom doors and windows, we approach this from a practical standpoint. Our factory in China produces both standard and fully custom sizes. For projects that require non-standard widths, we can adjust the profile structure and fittings to match your local building codes and specific dimensions. We handle direct factory supply, which means you are not paying a middleman markup, and we provide full pre-shipment inspections to verify that the dimensions are correct before the units are packed for FCL or LCL shipment. If you have a project that requires specific door widths, you can submit your drawings for a precise quote.

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