# QS vs estimator: what's the difference?

> An estimator prices the work — taking off quantities and building a competitive tender — while a quantity surveyor manages cost across the whole project, from the first estimate through to the final account.

The terms are often used interchangeably, but an estimator and a quantity surveyor do different jobs. The simplest way to think about it: an estimator focuses on **winning the work at the right price**, while a quantity surveyor focuses on **controlling cost once the work is underway**.

## What an estimator does

An estimator prices construction work to produce a competitive tender. They:

- read drawings and specifications,
- take off quantities,
- obtain supplier and subcontractor quotes,
- build up rates for labour, materials and plant,
- and assemble the bid.

Their job is largely front-loaded — before a contract is awarded.

## What a quantity surveyor does

A quantity surveyor (QS) has a broader, longer role across the whole project lifecycle. They:

- prepare cost plans and bills of quantities,
- run tenders,
- value work in progress for interim payments,
- manage variations and change,
- handle contractual matters,
- and agree the final account.

A QS is involved from the earliest cost plan right through to the closing figure.

## The overlap

Many estimators come from a QS background, and plenty of firms offer both services. On a smaller job the same person may estimate the work and then manage its cost. On a larger project the roles are usually separate — an estimating team wins the work, and a commercial/QS team manages it on site.

## Which do you need?

- Need a **price to start a project or compare quotes**? You need estimating.
- Need someone to **manage cost, payments and the final account** across a build? You need a quantity surveyor.

[Browse estimators and quantity surveyors](/disciplines) by trade and location to find the right specialist.

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Source: [QS vs estimator: what's the difference? on Find An Estimator](https://findanestimator.com/guides/qs-vs-estimator-difference)