13/10/2026
𝗔𝗻 𝗲𝘀𝘁𝗶𝗺𝗮𝘁𝗲 𝗰𝗮𝗻 𝗯𝗲 𝗽𝗿𝗲𝗰𝗶𝘀𝗲 𝘁𝗼 𝘁𝗵𝗲 𝗹𝗮𝘀𝘁 𝗱𝗲𝗰𝗶𝗺𝗮𝗹 𝗮𝗻𝗱 𝘀𝘁𝗶𝗹𝗹 𝗯𝗲 𝘂𝗻𝗿𝗲𝗹𝗶𝗮𝗯𝗹𝗲. 🧊
A quantity take-off can be measured correctly. A cost plan can price every listed item. And the final figure can still fall short.
The arithmetic is rarely the problem. The problem is what the project information leaves open.
Estimates lose reliability in three places:
🔹 𝗨𝗻𝗱𝗲𝗳𝗶𝗻𝗲𝗱 𝗲𝗹𝗲𝗺𝗲𝗻𝘁𝘀 — if the drawings or model don't show an item, the take-off doesn't capture it.
🔹 𝗔𝘀𝘀𝘂𝗺𝗲𝗱 𝘀𝗽𝗲𝗰𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 — every item is priced, but against a spec that may change after award.
🔹 𝗔𝘀𝘀𝘂𝗺𝗲𝗱 𝘀𝗰𝗼𝗽𝗲 𝗮𝗻𝗱 𝗺𝗲𝘁𝗵𝗼𝗱𝘀 — the estimate reflects how the work was expected to be built, not necessarily how it will be.
Measurement accuracy tells you how well the known scope was quantified. Reliability depends just as much on what remains unknown — and whether those assumptions and exclusions are stated clearly.
Before relying on an estimate, ask what it assumes.
