Building components · Openings & Frames
Door Frame
Explains the door frame as a loaded element, since a door is a moving mass acting on it repeatedly.
Educational reference entry. What this element has to do, and whether any particular arrangement of it is adequate, depends on the whole assembly, the loading, the exposure, local requirements, the manufacturer's instructions and qualified professional design.
Overview
What a door frame is
A door frame is fixed into an opening and carries the door: its weight through the hinges, the forces of it being used, and whatever the door is required to resist when closed.
Unlike a window frame, it is subject to repeated dynamic loading. A door being opened and closed thousands of times acts on the frame at the hinge side, and any looseness there shows quickly.
Boundaries
How it differs from nearby elements
The distinctions that keep this entry from being a restatement of its neighbours.
- It is not the door. The door is the moving leaf; the frame is the fixed surround.
- It is not a window frame. Both sit in openings, but a door frame carries a swinging mass and meets the floor, which introduces a threshold condition a window has no equivalent of.
- It is not a lining in the decorative sense, although the words overlap in internal work: a lining that carries a door is doing structural work whatever it is called.
Terminology
Common names and aliases
These names describe the same element. The library keeps one entry per component so that a trade term or a regional name never becomes a second, thinner page.
- door frames
- door lining
- doorset frame
Dependencies
What it depends on
What has to be right elsewhere for this element to do its job.
- How it is fixed into the opening, particularly on the hinge side where the door's weight acts.
- The threshold condition at its base, which for external doors combines weathering, drainage, thermal continuity and level access.
- Whether it is required to contribute to fire or acoustic separation, which changes it from a surround into a rated assembly.
- Squareness and alignment, since a frame out of square gives a door that will not close properly.
Considerations
Topics that genuinely apply here
Subjects worth discussing about this element. These are discussion topics, never measured values, ratings or performance claims.
Where a door is required to resist fire, the frame, seals and hardware are part of the assembly rather than accessories to it, and a rated door in an unrated frame is not a rated doorset.
Sound passes readily around a door, so perimeter seals and threshold arrangements determine the separation more than the door leaf alone.
External door thresholds sit where water arrives and where level access is commonly wanted, which are competing requirements.
Frames must be fixed square and plumb; a distorted frame is not correctable by adjusting the door.
Materials
Commonly formed from
Material families this element is commonly realised in. This states common practice only — it is not a statement that any of these materials suits this component in a particular building, which depends on the whole assembly and on qualified review.
Materials
Commonly incorporates
Materials this element commonly contains as a distinct constituent part, rather than being made of.
Assemblies
Building systems this element is met in
The role this component fills inside each assembly. A role describes what the element does there — it is not a statement that this component suits that system in any particular building.
Where it is met
Application contexts
Building contexts where this element is commonly encountered. Association is not recommendation: appearing here does not mean the component suits every instance of that context, or any particular one.
- Internal Partition
- Opening
Related elements
Neighbouring components
Typed relationships to other elements. There is deliberately no generic “related” category: an edge that cannot be classified does not exist.
Clarifications
Commonly misunderstood
- That a fire door is a door. It is a doorset: leaf, frame, seals and hardware together, and the certification applies to the assembly.
- That door problems are hinge problems. Frames working loose in the opening are at least as common a cause.
Conversations
Questions for qualified professionals
Questions worth asking someone with the project in front of them. This page cannot answer them.
- How is the frame fixed, particularly on the hinge side?
- Is this door required to resist fire or provide acoustic separation, and is the frame part of that assembly?
- How is the external threshold arranged for water, thermal continuity and level access together?
- Is the frame square and plumb, and does the door close without adjustment?
Go deeper
Related Build Design Hub guides
Planning guidance behind the decisions this element involves.
Preparation
Related planning checklists
Owner-side preparation before the conversation where this element comes up.
What this entry does not do
- No dimension, fixing, seal, fire rating or acoustic value is stated here.
- Fire-resisting doorsets are certified as complete assemblies; substituting any part is a regulatory matter.
Openings & Frame Elements
The frames, heads, jambs, sills, thresholds and closers that form and finish an opening through a wall.
Browse all openings & frames entries →