← Interior door bid calculator
Owners call with a slab in the hallway: “I already bought the door. Can you just hang it for $150?” That sounds like free margin because the millwork invoice left the bid. It did not leave the trip, the hang hours, or the chance that the leaf is a 30-inch in a 32-inch jamb.
Open the free interior door bid calculatorA carpenter-supplied hollow slab still carries the millwork invoice. An owner-supplied leaf that actually hangs zeros that line and keeps the same set hours. On a typical 80-inch hang-only — $42 wage, 30% burden, 15% overhead, 20% target margin, six miles — the carpenter-supplied bid is in the mid-$300s. Zeroing a $48 slab drops it, but the owner-supplied walk-away stays above $150. Taking the Facebook special to “just hang what they bought” still loses money.
| You supply | They supply, it hangs | They supply, wrong size | |
|---|---|---|---|
| Leaf invoice in the bid | Yes | No | No |
| Hang hours | Same | Same | Same, plus a callback |
| At $150 hang-only | Loses | Still loses | Loses more |
Store shelves default to 80-inch by 24/28/30/32. Plenty of jambs are 96-inch, a pair, or a hair tight. Hanging the wrong slab means a plane pass or a drive back to exchange it. Price that callback on the same opening before you agree. The calculator adds a starting second trip and a plane/shim kit on top of the rates you already typed.
Open the interior door bid calculator, enter the opening you are standing in, and put their hang-only number in “price you’re considering.” The who-supplies table scores that number against you-supply, owner-supplies-it-hangs, and owner-supplies-wrong-size. Nothing is uploaded.
This is the same arithmetic as how much to charge to replace interior doors. It is not a building-code determination, a fire-rating specification, or a reason to refuse a customer — it is the walk-away number on each supply path.
Only after you price the hang without the millwork invoice. Pulling their slab is still a trip, a set, and crew hours. A $150 hang-only special often sits under that walk-away number even when the leaf is free to you.
Usually not. Zeroing a $48 hollow-slab invoice drops the bid, but loaded labor, travel, and overhead stay. On a typical 80-inch hang-only the owner-supplied walk-away is still above $150. A slab that binds or is the wrong height adds a second trip and a plane pass.
That is a second dispatch plus a plane and shim, or a drive back to exchange it. Price that callback on the same opening before you agree to hang whatever they rolled into the driveway. The calculator adds a starting callback trip and a plane kit on top of your current rates.