Plumbline
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Plumbline 0.1.0

An early build for testing. It has not been run against a production model by anyone yet, and you should not point it at a job you cannot afford to have opinions about.

A review aid, not a compliance certificate. It cannot approve a design, and a report with no failures is not evidence of compliance.

0.1.0 Latest Untested
Revit 2026 · Windows · 449 KB · 29 August 2026
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What it is

A Revit add-in that measures your model against thresholds held in editable rule packs, then shows you every place it falls short.

Three answers, not two. Fail, Pass, and Inconclusive when the model cannot answer the question at all. A run full of Inconclusive is telling you the model is not yet modelled to a standard anyone can check, which is worth knowing early.

How it works

Pick your rule packs and your state, run the audit, and read the findings grouped by rule. Click any one to jump to that element, or paint the whole set into the active view.

Tick what you want fixed. Parameter changes are applied as one undo step, with the count of other elements each will move shown first. Anything needing a wall moved is walked through one at a time. Then it re-audits and tells you what actually closed.

Installing it

  1. Unzip it.
  2. Copy both NccChecker.addin and the NccChecker folder into %AppData%\Autodesk\Revit\Addins\2026\ Paste that path into an Explorer address bar to get there. Create the 2026 folder if it is not already there.
  3. Start Revit and open a project.
  4. Revit will warn that the add-in is unsigned. Choose Always Load. That warning is expected: the assembly is not code-signed yet.
  5. An NCC tab appears on the ribbon. Audit Model runs it.

To remove it, delete those two items from the same folder. Nothing else is installed and nothing is written outside your user profile.

Release notes

0.1.0 29 August 2026 · first build

Before you point it at a real job

Plumbline cannot approve or certify a design. It reports where a model misses a number that someone typed into a rule pack, and 14 of its 33 thresholds have not been checked against any source document at all.

Not affiliated with or endorsed by the ABCB, and it does not include or reproduce the NCC. © Commonwealth of Australia and the States and Territories 2022, published by the Australian Building Codes Board. Autodesk and Revit are trademarks of Autodesk, Inc.