Warning · Spatial structure
How to fix Opening without host
in IFC files
Re-host or delete orphan IfcOpeningElement voids — every opening must cut a host element through IfcRelVoidsElement.
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No account · No upload · Runs in your browser · 38 validation checks
What it means
The Opening without host check
IfcOpeningElement not connected to any host element via IfcRelVoidsElement
The fix
How to fix Opening without host in your authoring tool
Concrete, tool-specific steps. The check itself is schema-agnostic and works for IFC2x3, IFC4, IFC4x1 and IFC4x3.
| Authoring tool | How to fix |
|---|---|
| Revit | Orphan openings come from deleted/edited hosts or loosely exported shaft openings. Delete stray openings and recreate the void on its host (wall/floor/roof) so the relationship exports, and re-host doors/windows if the cut was lost. |
| ArchiCAD | Openings must belong to a wall or slab. Remove free-standing opening objects and use the Opening tool (or door/window) anchored to the host so ArchiCAD exports IfcRelVoidsElement. |
| Tekla | Recreate the cut/opening as a feature of its host part instead of a loose object, so the void references a host on export. |
| Allplan | Place openings with the wall/slab opening tools so they belong to a host; delete detached opening solids. |
How it works
Find and fix it in the browser
The whole flow runs client-side — your IFC file never leaves your machine.
01
Open your IFC file
Open IFC Viewer Online and drag & drop your IFC file. It is parsed locally in your browser via WebAssembly — nothing is uploaded.
02
Run the Health Score validation
Run validation. The "Opening without host" check (RULE_OPENING_WITHOUT_HOST) flags every affected element and pinpoints it in the model tree.
03
Fix in Revit
Orphan openings come from deleted/edited hosts or loosely exported shaft openings. Delete stray openings and recreate the void on its host…
04
Fix in ArchiCAD
Openings must belong to a wall or slab. Remove free-standing opening objects and use the Opening tool (or door/window) anchored to the host so…
05
Fix in Tekla
Recreate the cut/opening as a feature of its host part instead of a loose object, so the void references a host on export.
06
Fix in Allplan
Place openings with the wall/slab opening tools so they belong to a host; delete detached opening solids.
07
Re-validate
Re-export from your authoring tool and re-run validation to confirm the issue is resolved and your Health Score improved.
Related checks
Other Spatial structure checks →
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