LIBRARY // ACCURATE MODELLING AND RESEARCH

Model Accuracy Checks for Revit and BIM Projects

A model can look convincing and still be wrong in ways that only show up on site. Accuracy checks catch that early.

A model is only useful if people can trust it. Drawings, schedules, quantities and coordination all come from it, so an error in the model spreads everywhere. Regular accuracy checks keep it reliable without slowing production down.

Check the foundations first

Coordinates and location

• Is the project base point and survey point set correctly?
• Do linked consultant models align with shared coordinates?
• Is true north set correctly for site and solar studies?

Levels and grids

• Do levels match the agreed datum and floor-to-floor heights?
• Do grids match the structural model?
• Are there duplicate or unused levels and grids?

Errors here affect every other element, so check them before modelling goes far.

Compare with source information

• Survey drawings or point clouds for existing buildings
• Architectural design drawings or sketches
• Structural and MEP consultant models
• Planning or authority-approved drawings, where the design must stay within limits

Overlaying the source in a view, or using a point cloud deviation analysis where available, makes differences easy to spot.

Check model health

• Review Revit warnings regularly, especially duplicate instances, overlapping walls and room separation issues
• Purge unused families and views
• Check for imported CAD files that should be linked instead
• Make sure elements are on the correct level and workset
• Keep file size under control

A healthy model is faster to work in and less likely to produce errors.

Check element data

Information matters as much as geometry:

• Wall, floor and door types match the design
• Rooms have names, numbers and correct boundaries
• Areas calculate as expected
• Parameters required for schedules are filled in
• Classification codes are applied if the project uses them

Schedules are a quick way to find blanks and odd values.

Check views and sheets

• Views use the right templates
• Crop regions don't hide important information
• Annotation and tags read correctly
• Sheets reference the correct views

Agree tolerances

No model matches reality perfectly. Agree tolerances for different elements and stages, especially for existing buildings, and record them in the BIM execution plan or modelling brief.

Document the checks

Keep a simple model check log showing what was checked, when, by whom and what was found. On ISO 19650 projects, checks are part of moving information between work in progress, shared and published states, so a record is useful evidence.

Make checks routine

Checks work best little and often. A quick weekly check of warnings, links and coordinates, plus a fuller check before each issue, catches most problems early.

1. 01Check the foundations first
2. 02Compare with source information
3. 03Check model health
4. 04Check element data
5. 05Check views and sheets
6. 06Agree tolerances

Share the results

Checks are only useful if the team acts on them. Share a short summary after each check, listing what was found, who's fixing it and by when. Recurring issues often point to a gap in the template, the families or the modelling guidance, so fix the cause as well as the symptom. Over time, the number of issues found at each check should fall.

An accurate model saves time across the whole project, from coordination meetings to site, and it protects the credibility of everything produced from it.

If your team needs extra production capacity for work like this, take a look at our Architectural production services, or tell us about your project.