There are different types of estimators, whose title may be preceded by a modifier, such as building estimator, or electrical estimator, or chief estimator. Other professional titles may also prepare estimates or contribute to estimates, such as quantity surveyors, cost engineers, etc.
In the US, there were 185,400 cost estimators in 2010. There are around 75,000 professional quantity surveyors working in the UK. The sheet separately includes materials and labours.