7/6/2013 9:07 AM
This is generally done to include all costs with the project. This way, the entire cost can be recorded, depreciated, and at some point in the future, replaced. If you do not include all costs, you may not be able to "afford" to replace/redo the work when it's again necessary.
Think of it this way: if you hired a company to do the work, all their costs are included as well.