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Estimating & Bidding

Estimator

In Plain English

The person who calculates how much a construction project will cost for bidding purposes.

Definition

An estimator is a construction professional responsible for quantifying and pricing project scope to develop accurate cost estimates for bidding or budgeting. Estimators interpret drawings and specifications, perform quantity takeoffs, solicit subcontractor and supplier quotes, and compile complete project costs. They are central to a contractor's ability to win profitable work.

Why It Matters in Bidding

The estimator directly determines whether a contractor wins work and whether that work is profitable, since both an overpriced bid that loses and an underpriced bid that wins damage the company. Their judgment on quantities, sub coverage, contingency, and markup sets the financial baseline the entire project team must then live within.

Example

Before the bid deadline, an estimator finishes the concrete takeoff, levels three competing rebar quotes to a common scope, applies a 4 percent contingency for incomplete drawings, and assembles the spreadsheet the project manager will later use as the cost budget.

Related Terms

Cost EngineerQuantity TakeoffEstimateBid

Frequently Asked Questions

They review drawings and specs, perform quantity takeoffs, send invitations to bid, solicit and level subcontractor and supplier quotes, track addenda, apply markup and contingency, and assemble the final number. Near deadlines they reconcile scope gaps and coverage to ensure every division is bid before submission.
Leveling means normalizing quotes to identical scope so prices are comparable. The estimator notes each sub's inclusions, exclusions, and alternates, adjusts for missing items, and confirms each covers the full drawing set and addenda. This prevents awarding to an apparent low bidder whose number actually omits work the GC must then absorb.
Strong drawing and specification literacy, accurate quantity takeoff, knowledge of local subcontractor and material markets, and disciplined risk judgment on contingency and markup. Speed under deadline pressure and clear documentation matter too, since estimates feed the project budget and any error compounds across the full job.

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