An exterior door is a building entry door designed to provide security, weather resistance, and energy efficiency.

An exterior door is a door installed at the outer boundary of a building, providing controlled access while protecting the interior from weather, intruders, and temperature extremes. It serves both functional and aesthetic roles, contributing to security, energy performance, and curb appeal.

In construction, exterior doors are commonly made from materials such as steel, fiberglass, aluminum, or solid wood. They are often paired with weatherstripping, thresholds, and insulated cores to reduce air and water infiltration. Exterior doors must meet specific performance requirements for durability, fire resistance, and energy efficiency depending on location and use.

Proper installation of exterior doors is critical to building performance. Doors must be correctly flashed, sealed, and aligned with the surrounding wall assembly to prevent leaks and drafts. Building codes often regulate exterior doors for egress, accessibility, fire rating, and thermal performance.

Fiberglass exterior doors are often molded with realistic wood grain patterns but resist warping and moisture far better than natural wood.

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