Revit’s OmniClass Name and and -Numbering functionality is
an extremely useful tool to create a bill of quantities which includes all relevant Revit categories in one schedule. This functionality is not used often enough,
as it will take a bit of time to set up (It is however worth it in the end!)
The most important thing to remember, not only for this Bill
of Quantities example, but for all of your Revit families, templates and
projects, is to use Revit Best Practices. If you do things properly right from
the start, you will reap the rewards not only for your current project, but
also for all existing and future projects.
To use the OmniClass functionality, take the following
points into consideration:
- Proper Revit family and type naming conventions
- Company specific, or custom, OmniClass Taxonomy file
- Correct OmniClass Name and –Number assigned to families
- Properly set up Bill of Quantities schedule
An OOTB mechanical Variable Air Volume unit was placed in a
project. The type properties of this unit contains the OmniClass Number, and
respective OmniClass Title that has been assigned to the unit. These properties
are greyed out, and thus not editable.
To access and modify the above mentioned properties, one has
to enter the VAV unit family environment. The OmniClass Number can be created
or modified from the instance properties. A list of OmniClass Numbers and
Titles will show (Extracted from an external OmniClass Table 23 Product
Classification text file)
The OmniClass Taxonomy text file can be found in the
following location:
C:\Users\<USER NAME>\AppData\Roaming\Autodesk\Revit\Autodesk
Revit 2015
The text file will contain the OmniClass Number in the first
column and the OmniClass Title in the second column. Should you require to edit
the Omniclass Titles and Numbers, remember to create a backup file, to ensure
that you will be able to restore the file should something go wrong.
We can now create a Multi-Category schedule, where we can
extract various common parameters from, such as the Count, Omniclass Number,
Omniclass Title, Family and Type, and Cost. This is where the family naming
conventions come in handy to ensure that you have consistency in your schedule,
and that the schedule looks like a MEP Bill of Quantities should look like.
With some minimal editing being made to the schedule, such
as changing the Sorting and Grouping options, as well as the Formatting, you
should be able to extract a graphical representation as per the image below.
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