Hollow metal and wood doors are not competing choices for the same opening so much as the right answer for different openings. Hollow metal, a steel door and frame, is the standard for exterior, stair, mechanical, and high-abuse openings and reaches fire ratings up to three hours. Wood, usually a solid-core architectural door, is used on interior openings where a finished appearance and sound control matter and is commonly rated up to about 90 minutes. The most common commercial configuration pairs them: a wood door in a hollow metal frame. Choose by opening function, fire rating, and exposure, not by a single building-wide default.
Door selection on commercial and multifamily projects is governed by the door schedule, where each opening is assigned a material, fire rating, and hardware set based on its function and location. Treating doors as one material decision for the whole building misses the point: an exterior or stair opening has different requirements than a unit entry, and a unit entry has different requirements than an interior bedroom door. Understanding how hollow metal and wood doors differ lets a GC confirm the schedule assigns the right door to each opening before procurement.
What each door is
A hollow metal door is built from formed steel face sheets over an internal core, which may be stiffened steel channels, a honeycomb, or an insulating fill, within a steel frame. Steel is dent and impact resistant, holds up to weather when galvanized, and is the default material for exterior and heavy-use openings. Hollow metal frames are used widely even where the door leaf is wood.
A wood door in commercial and multifamily construction is typically a solid-core flush door, a wood or composite core faced with a wood veneer or laminate. Solid-core construction gives it mass for sound control and fire resistance and a finished appearance for interior and public-facing openings. Wood is not used for exterior openings because it is susceptible to moisture, warping, and weather over time.
The decision factors side by side
| Factor | Hollow metal (steel) | Wood (solid-core) |
|---|---|---|
| Construction | Steel faces over a core, steel frame | Solid core with wood or laminate face |
| Fire rating ceiling | Up to 3 hours | Commonly up to about 90 minutes |
| Durability and impact | High, dent and abuse resistant | Good interior; can warp or dent |
| Exterior and moisture | Standard for exterior; galvanized options | Not for exterior; moisture sensitive |
| Appearance | Utilitarian, painted | Finished wood, warmer look |
| Acoustics | Depends on core and sealing | Depends on core and sealing |
| Security | Higher resistance to forced entry | Lower |
| Typical use | Exterior, stair, mechanical, corridor | Unit entries, interior, amenity |
Fire rating, durability, and exposure
The clearest difference is the fire rating ceiling. Steel door and frame assemblies are available up to three hours, while fire-rated wood doors are commonly available up to about 90 minutes. Both are fire-rated products used throughout code-compliant buildings, but where an opening requires a rating above the wood ceiling, hollow metal is specified. Confirm the required rating per opening on the door schedule against the governing code.
On durability, steel is the tougher material. It resists dents, impact, and abuse, and hollow metal openings commonly last for decades in service. Wood doors perform well on protected interior openings but are more vulnerable to denting, warping, and, where exposed to moisture, deterioration. For exterior, stair, mechanical, trash, and other high-abuse or weather-exposed openings, hollow metal is the standard. Steel also offers higher resistance to forced entry, which matters at exterior and secured openings.
Acoustics and appearance
Sound control is often assumed to be a material choice, but the acoustic performance of a door depends more on its core, thickness, and perimeter sealing than on whether it is steel or wood. A solid-core door with full perimeter gasketing and a door bottom will outperform a poorly sealed door of either material. The practical multifamily pattern is a solid-core wood unit entry door for its combination of sound control and finished appearance, with hollow metal reserved for corridor, stair, and service openings. Where a specific sound rating is required, confirm the tested STC of the actual door and frame assembly rather than assuming a material delivers it.
On appearance, wood provides the warm, finished look expected at unit entries, lobbies, and amenity spaces. Hollow metal is utilitarian and painted, appropriate where function rather than finish drives the opening.
Which to choose
Use hollow metal at exterior openings, stair and corridor fire doors, mechanical, electrical, and trash rooms, and any opening where durability, a high fire rating, weather exposure, or security governs. Use solid-core wood at unit entries, interior unit doors, and public-facing openings where appearance and sound control matter, commonly hung in hollow metal frames so the frame carries the rating and the wood leaf carries the finish. The wood-door-in-steel-frame combination is the most common commercial interior configuration for exactly this reason. Confirm each opening against the door schedule rather than applying one material across the project.
How Innergy approaches the openings package
Doors, frames, and the hardware that hangs on them fall under CSI MasterFormat Division 08, Openings, the same division that covers our shower door, glazing, and mirror scope, with steel doors and frames specified around section 08 11 00 and flush wood doors around section 08 14 00. On Innergy projects, openings and their hardware are scheduled per opening with the material, fire rating, and hardware set confirmed against the door schedule and the governing code before procurement, so a fire-rated or exterior opening is never defaulted to the wrong door. For openings and hardware coordination as part of a full Division 8 scope or a seven-division interior finishes package in TX, WA, OR, CO, UT, NM, or AZ , contact us and we respond within one business day.
Innergy covers Division 8-Openings, Mirrors & Shower Doors for multifamily construction and commercial construction under a single subcontract. Matching each door to its opening, hollow metal where fire rating, durability, and exposure govern and solid-core wood where appearance and sound control matter, is the reliable way to get an openings package that passes inspection and holds up in service.