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Estimating & Biddingaka: definitive estimateaka: bottom-up estimate

Detailed Estimate

In Plain English

A thorough line-by-line cost estimate prepared from complete drawings and specs.

Definition

A detailed estimate is a comprehensive cost projection developed from complete construction documents, using quantity takeoffs of every material and system in the project. It provides the highest level of estimating accuracy, typically plus or minus 5–10%, and forms the basis for a contractor's bid. Detailed estimates require significant time and expertise to prepare.

Why It Matters in Bidding

A detailed estimate is the foundation of a competitive, defensible bid because it builds the price from measured quantities rather than assumptions, exposing exactly where margin and risk live. Its line-item structure lets estimators solicit and level subcontractor quotes, apply accurate markup, and respond quickly to addenda or scope changes. Skipping this rigor on a complex project invites both losing bids and unprofitable wins.

Example

Working from complete construction documents, the estimator performs full quantity takeoffs for concrete, rebar, and formwork, prices each line with current unit costs and sub quotes, then rolls the totals into the lump-sum bid with markup.

Related Terms

Quantity TakeoffEstimateEstimatorMaterial Takeoff

Frequently Asked Questions

A detailed estimate is the most accurate method, commonly within plus or minus 5 to 10 percent, because it relies on quantity takeoffs from complete documents and current pricing. Conceptual and parametric estimates, used earlier when design is incomplete, carry much wider ranges and more contingency.
It requires complete construction documents and specifications, accurate quantity takeoffs, current material and labor unit costs, subcontractor quotes, and equipment rates. The estimator then adds general conditions, overhead, markup, and contingency. Any addenda must be incorporated so the final number reflects the latest scope before bid submission.
Significantly longer than approximate methods, because every system must be taken off and priced. Time depends on project size and complexity, document quality, and how many subcontractor quotes are involved. Estimators often start takeoffs early in the bid period to leave room for quote leveling and addenda near the deadline.

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