Addons, or markups, are indirect costs that apply to the whole estimate. Addon amounts can be based on a wide variety of costs such as the total cost of the estimate, category costs (labor, material, and equipment, for example), or selected hours.
| Possible markups include | Such as |
|---|---|
| Lump sum amounts | Permit fees |
| Fixed amounts | Telephone hookup |
| Fixed amounts with break points | Insurance |
| Straight percentage amounts | Profit, sales tax |
| Percentage amounts with break points | Bonds |