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BIM model change review

What changed in the model, and which line items should you review?

When a new BIM model version arrives, Axiora compares it with the previous one, shows the new, modified, reclassified and deleted elements, how much the quantities vary, and which budget line items are worth reviewing.

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For Structures, Architecture and MEP, as an assisted review. The price depends on complexity and we send it to you before charging.

What you need

  • Budget in ExcelRequired
  • Two versions of the BIM model (IFC or RVT)Required

Example findings

  • Affected line item04.08.03: BIM v3 86.4 m² → v4 92.1 m² (+6.6 %)
  • Deleted elementsDoor P-02: 8 → 6 units between v3 and v4

Illustrative data

What this review answers

Impact of changes

What changed between model versions, and which line items does it affect?

Shows which elements are new, modified or deleted, how much the quantities vary and which line items are worth reviewing.

Version comparisonBIM v3 → v4

Modified214 elem.−120.40 m²
New96 elem.+186.20 m²
Reclassified31 elem.−8.20 m²
Deleted18 elem.−12.60 m²
Affected line item 04.08.0386.4 m²→92.1 m²BIM v3 → BIM v4
Illustrative example

Example result

Architecture · IFC model v3 against v4Illustrative example
Line itemUnitBIM v3BIM v4VariationFinding
04.08.03 Porcelain skirting tile 60×120m²86.4092.10+5.70 (+6.6 %)Line item possibly affected
04.17.02 Flush door P-02ea86−2 (−25.0 %)Elements deleted in v4
04.08.01 Porcelain floor tile 60×60m²409.80409.800.00No changes

Coverage: 3 line items compared between versions · 2 with changes to review.

What it reviews

What changed
Elements that are new, modified, reclassified or deleted between the previous version and the current one.
Affected line items
Quantity variations per line item, and items worth reviewing against the new version.
Potential impact
It estimates an amount only when the change links reliably to line items and unit rates. Otherwise it reports the change with no amount.
Tracking
Shows which findings are new, which persist and which were resolved since the previous review.

How it works

  1. 01

    Axiora reads and classifies the information

    It identifies the budget line items and the elements of each BIM model version.

  2. 02

    Axiora compares versions

    It identifies what changed between versions and links it to the budget line items. A specialist reviews the changes before they are delivered.

  3. 03

    Review the changes

    Review each change against its previous and current version, and decide with your team what to adjust.

Scope and limits

  • If an element is deleted and recreated in the model, it may appear as both deleted and added.
  • The financial impact requires line items with a unit rate and a reliable link to the model.
  • A change in the model is not automatically a variation: it depends on the contract and the scope.

Other reviews

Review your budget with evidence, not just with assumptions.

We show you how Axiora checks a budget against the BIM model, the drawings and the specifications.

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We show you how Axiora checks a budget against the BIM model, the drawings and the specifications.