| Solid timber | Warm natural appearance; can be made with a substantial, solid feel. Timber can expand or contract as humidity changes. | Clear or tinted stain, paint, or a protective clear coat. The finish should be suitable for the door’s exposure to sun and weather. | Can be combined with a glazed panel when the door is designed and reinforced for it. | Inspect the finish periodically and maintain it as recommended, especially on exterior faces and edges. | Homes seeking a natural look, provided the door is appropriately engineered for its size and climate. |
| Aluminum | Lightweight relative to many solid door materials and resistant to corrosion when properly finished. Thermal performance depends on the frame design. | Powder-coated colors or anodized finishes are common. Ask how the finish is rated for the intended exposure. | Often used with single or insulated glazing, depending on the frame system and energy requirements. | Usually requires routine cleaning and checks of seals, hardware, and drainage details. | Contemporary designs and projects where a slim frame or large glazed area is desired. |
| Steel | Strong and suitable for slim-profile designs when correctly specified. Protective treatment is important to help prevent corrosion. | Painted or powder-coated finishes; exposed steel may need additional corrosion protection depending on the environment. | Can incorporate safety glazing. The frame and glass specification should be selected together. | Check the coating for damage and address exposed areas promptly, particularly in damp or coastal conditions. | Designs that call for narrow sightlines and a strong frame, with suitable protective finishing. |
| Timber-aluminum composite | Combines a timber interior appearance with an exterior aluminum cladding in many system designs. | Interior timber stain or clear coat paired with a factory-finished exterior cladding. | Available with glazing in systems designed to accept the selected glass thickness and weight. | Maintain the interior timber finish and clean the exterior cladding; inspect seals and hardware. | Projects seeking a timber interior and a more weather-resistant exterior surface. |
| Tempered safety glass | Provides a clear view and allows daylight through. Tempered glass is heat-treated; safety-glazing requirements vary by location and application. | Clear, tinted, patterned, or obscured glass; appearance and solar performance vary by specification. | Use a glass type and thickness approved for the door system. Laminated safety glass may be required or preferred in some locations. | Clean with a non-abrasive glass cleaner and inspect glazing seals and edges. | Doors where daylight and visibility are priorities, subject to privacy, energy, and safety needs. |
| Insulating glass unit | Two or more panes separated by a sealed space can improve thermal performance compared with a single pane; actual performance depends on the unit and frame. | Clear, low-emissivity, or solar-control glass options may be available. Confirm the specified performance values. | Often selected for exterior doors where energy performance is important. The complete door assembly affects overall results. | Keep the unit’s seals protected and have any failed or damaged glazing assessed by a qualified professional. | Exterior entrances in climates where reducing heat transfer is a design priority. |