1. Forgetting Waste and Laps
Quantifying only the theoretical geometry ignores the material you'll actually buy. Rebar laps, drywall waste, and cut offcuts all add up. Skip the allowances and your numbers are short before you start.
2. Missing Scope in the Schedules
The floor plan rarely tells the whole story. Door, window, and finish schedules carry quantities and specs the plans only hint at. Estimators who don't reconcile both miss scope.
3. Ignoring the Specifications
The drawings show geometry; the specs define quality and inclusions. Pricing a standard finish when the spec calls for a premium one is a margin error waiting to surface during submittals.
4. Inconsistent Methods
When every estimator measures differently, your quantities — and your costs — become unpredictable. Standardized takeoff methods are what make numbers repeatable across jobs.
5. Padding Instead of Measuring
Adding contingency to cover shaky quantities prices you out of close bids. The fix isn't a bigger cushion — it's quantities accurate enough that you don't need one.
6. Rushing the Hard Trades
Earthwork, MEP, and structural steel carry the most risk and reward the most care. Rushing them to hit a deadline is where the biggest dollar errors hide.
7. Not Documenting Assumptions
Undocumented guesses are unprotected guesses. Recording every assumption alongside the quantity makes your bid defensible and your RFIs faster. Avoid these seven and your margins get far more predictable.
