What is a bid estimate in construction?
A bid estimate is a contractor's priced offer for a defined scope, built from the bid documents: quantities from a takeoff, unit prices, labor burden, general conditions, bonds and insurance, contingency, overhead and profit. It is submitted on the bid form and becomes the contract price if the contractor is awarded the work.
Bid Estimate Definition
The priced number a contractor submits on a bid form to compete for a defined scope of work is the bid. It converts the bid documents — plans, specifications, addenda and the owner's general conditions — into a single lump sum or a set of unit rates that the contractor will be bound to if awarded the contract. The definition matters because the number is a promise, not a budget: once the bid opening closes, the contractor cannot reprice the labor, material or risk it already committed to. A useful definition therefore has three parts: a measured quantity takeoff, a cost basis for each quantity, and a documented allowance for what the drawings do not show.
Bid documents drive the boundary of the number. Division 01 general conditions define site supervision, temporary facilities, cleanup and closeout obligations; Division 03 concrete and Division 26 electrical scopes set the quantities you price; the supplementary conditions and the performance bond requirement set the cost of guaranteeing the work. Read the addenda before you price anything, because an addendum issued during the bid period replaces the drawing or specification it amends, and pricing the superseded sheet is the most common way a submission becomes nonresponsive.
An engineer's estimate is the owner's or design team's independent opinion of probable cost, prepared from the same drawings and usually published at bid opening for comparison. It is not a contractor's submission. It carries no contractor commitment, no bond and no markup for risk transfer, so a number that lands far below it usually signals a missed scope item rather than a bargain. When you compare your figure to the engineer's number, reconcile the differences line by line instead of arguing the total.
Two deliverables keep the number traceable: a quantity sheet showing the measurement rule and unit for every line, and a pricing sheet showing labor hours, wage rate, material unit cost and markup. Our priced bid submissions are built that way, with each figure tied to a published source. If you want to see how the submitted number differs from an internal budget figure, read bid vs estimate before you set your markup.
Components of a Bid Estimate
A contractor's estimate for a submitted price is assembled in three layers: direct costs you can measure, indirect costs you must carry for the duration, and markup that covers risk and profit. Keep the layers separate on the sheet. When a number is questioned at bid review, you need to show which layer it came from without rebuilding the whole estimate.
Start with the plans and specifications and complete the takeoff before you price a single line. The sequence is fixed: measure quantities by CSI MasterFormat division, assign a unit and a measurement rule, then apply labor, material and equipment rates. Pricing out of order — taking a subcontractor's lump sum before you have your own quantities — leaves you unable to test whether the quote covers the full scope.
Direct costs
Direct costs are the labor, material and equipment consumed by the work itself. Labor is priced as hours times a fully burdened rate, where labor burden carries payroll taxes, workers' compensation and benefits on top of the base wage. Prevailing wage projects use the applicable wage determination instead of the open-shop rate. Material is priced at the delivered unit cost, including sales tax where the jurisdiction applies it, plus a typical waste allowance by trade — a common range is 5 to 10 percent for dimensional lumber and 3 to 5 percent for ready-mix concrete, and you should confirm the allowance your supplier and field crew actually expect.
Indirect costs and general conditions
Indirect costs are the general conditions items that support the work without being part of it: project supervision, temporary power and water, site fencing, mobilization, permits, submittals and closeout documents. Price supervision as months on site times a monthly rate, not as a percentage, so a schedule slip shows up as a real cost. Mobilization is a one-time line tied to the number of trips the site requires.
Markup, risk and clarifications
Markup covers overhead and profit, plus contingency for the risk the drawings leave open. Contingency percentage should reflect the estimate class and the completeness of the documents, not a habit. List every assumption on the bid form itself: allowances for owner-furnished equipment, alternates priced separately, and any addendum you priced against. Unstated assumptions do not protect you after award. Our worksheet for assembling the three layers follows this structure, and our guide on how to estimate a construction bid walks the takeoff sequence step by step.
Bid Estimate vs Engineer’s Estimate
The two documents answer different questions. The contractor's submission asks what a firm will charge to perform the scope under the contract terms; the engineer's estimate asks what the design team believes the work should cost. The gap between them is information, not error, and reading it correctly is how you decide whether to sharpen a number or walk away.
The contractor's version carries commitment. The firm signs the bid form, accepts the general conditions, and typically furnishes a bid bond with the submission and a performance bond on award. Those obligations cost money and appear in the number. The engineer's estimate carries none of them, so it usually excludes bond premiums, contractor overhead and the risk premium a firm adds for a scope it cannot fully verify.
Do not confuse this comparison with the difference between a submitted number and a cost estimate. A cost estimate is an internal planning tool, often prepared to AACE estimate classes, and it can be revised freely as design develops. The submitted version is frozen at the bid opening. The same quantity takeoff can feed both, but only the bid version adds the bond, the schedule risk and the markup.
Use the table below as a reconciliation checklist when your number and the engineer's estimate diverge.
When the difference sits in one division, re-measure that division before you touch markup. A concrete quantity that is 8 percent light usually traces to a slab thickness read from the wrong sheet or a waste allowance left off. When the difference is spread evenly across every division, the cause is more often contingency or bond cost, and the fix belongs in the markup section rather than the takeoff. Our bid day support covers the final reconciliation before submission, and general contractor estimating covers the budget side of the same numbers.
| Line item | Contractor bid estimate | Engineer's estimate | What the gap usually means |
|---|---|---|---|
| Quantity takeoff basis | Measured from issued drawings and addenda | Measured from design documents at the current phase | Design phase difference, not a pricing error |
| Labor rate | Fully burdened wage plus labor burden | Published wage data without contractor burden | Burden omitted on the owner's side |
| Bond and insurance | Bid bond, performance bond and insurance premiums included | Usually excluded or carried as an allowance | Real cost the owner's number does not carry |
| General conditions | Priced by months on site | Often a percentage of construction cost | Schedule assumptions differ |
| Contingency | Set by estimate class and scope gaps | Set by design phase and owner policy | Compare the basis, not the percentage |
| Markup | Overhead and profit stated separately | Typically excluded | Contractor business cost, not waste |
| Alternates | Priced separately on the bid form | May be folded into the base number | Check that both compare the same base scope |
Bid Estimate Example
Here is a worked contractor example for a single-story tenant improvement: 4,000 sq ft of interior build-out in an existing shell, Division 03 slab infill and Division 26 power and lighting included. The scope of work is fixed by the bid documents, so every line below carries a unit, a quantity from the takeoff, and a unit price built from labor, material and equipment.
Labor is priced at the published wage for the trade plus labor burden. Take the carpenter line: 640 labor hours at a base wage rate of $29.12 per hour is $18,636.80 in wages; a 38% burden for payroll taxes, workers' compensation and fringe adds $7,081.98, for a loaded labor cost of $25,718.78. Material for the same line is 3,200 board feet at $1.85 per board foot, or $5,920.00, and a 10% waste allowance on framing lumber adds $592.00.
The table shows the components of the submission as they land on the bid form. Direct cost is the sum of the trade lines; general conditions, overhead and profit, bond and insurance, and contingency are applied on top. Confirm sales tax treatment with your accountant, since rules vary by state and by whether the contractor is the purchaser of record.
A lump sum bid form asks for one number, but the backup stays line-item so change orders and alternates can be priced from the same unit prices. If a scope gap appears after bid opening, the line-item backup is what lets you price the add without rebuilding the whole sheet. Our spreadsheet structure for bid summaries mirrors this layout, and takeoff and pricing support covers the quantities behind it.
| Line item | Basis | Amount |
|---|---|---|
| Division 03 concrete and slab infill | Direct cost | $86,400 |
| Division 26 electrical | Direct cost | $112,750 |
| Framing, drywall and finishes | Direct cost | $241,300 |
| General conditions (supervision, temp facilities, cleanup) | 8% of direct cost | $35,236 |
| Bond and insurance | 2.5% of direct cost | $11,011 |
| Contingency | 5% of direct cost | $22,023 |
| Overhead and profit | 12% of direct cost plus general conditions | $57,022 |
| Bid total | Sum of lines | $565,742 |
How Long a Bid Estimate Stays Valid
The offer you submit has a clock attached. A number priced from current material quotes is a snapshot, and the bid form should state how long the offer holds. Thirty days is common on private work; public agencies set their own acceptance window in the instructions to bidders, and some hold bids for 60 or 90 days before award.
What is included in the submitted price changes as the hold period lengthens. A firm lump sum with a 90-day acceptance period carries more exposure than a 30-day offer, because lumber, steel and copper wire move between the day you price and the day you sign. The PPI series for lumber and wood products, steel mill products and copper wire and cable each show the 12-month direction of those inputs; when a series is climbing, the estimator either shortens the validity window or adds an escalation line to the submitted price.
The bid bond is a separate clock. A surety issues the bond against a stated bid amount and expiration, and if the bid is extended the bond must be extended with it. A bid bond that lapses while the owner is still evaluating bids leaves the contractor exposed on the performance bond that follows award.
Line-item structure matters here too. A CSI MasterFormat breakdown by division lets you reprice only the affected trades when an addendum or an extended award date arrives, instead of reworking the entire sheet. Alternates should be priced with their own validity so the owner can accept base bid and alternate on different schedules.
Read the instructions to bidders before you set the date, and put the expiration on the bid form itself. If you need the pricing rebuilt against a revised award date, send your plans and we will quote the work. For teams pricing public work, our bid day support for hard bids covers the addendum and bid-form checks that keep the validity date consistent across every document.
Frequently Asked Questions
What is a bid estimate in construction?
A bid estimate is the priced document a contractor submits to an owner on bid day, built from the bid documents, a quantity takeoff and unit prices, with general conditions, overhead and profit, bonds and contingency added. It states a lump sum or unit rates against the bid form, not a range. Every line should trace to a drawing, a specification section and a measurement rule.
What is included in a construction bid estimate?
A complete bid estimate carries the scope of work by CSI MasterFormat division, quantities with units, labor hours and burden, material prices with sales tax, subcontractor quotes, general conditions, mobilization, bond and insurance costs, contingency and profit. Alternates and allowances are listed separately so the bid form can be filled without rework. Exclusions are written out, because an unstated exclusion becomes your risk.
How long does an estimate remain a firm bid?
A bid estimate stays firm for the period named in the bid form, commonly 30 to 60 days after bid opening; after that, material escalation and subcontractor quote expirations take over. Copper wire and cable and steel mill products move faster than concrete, so the validity window should match the volatile divisions. State the expiration date on the bid form and in the cover letter.
What is the difference between the engineer's estimate and the contractor's bid?
The engineer's estimate is the designer's opinion of probable cost, prepared for the owner's budget before bids are opened. The contractor's estimate is a binding offer priced from the same plans but with the bidder's own labor rates, subcontractor quotes and risk position. The gap between them shows up at bid tabulation and usually reflects market conditions rather than takeoff error.
How do you prepare a bid estimate?
Preparation runs in sequence: read the full bid documents and every addendum, perform the quantity takeoff by division, price labor with burden and prevailing wage where required, attach subcontractor quotes, then add general conditions, bonds, contingency and profit. A senior estimator reviews the sheet before the bid form is signed. Skipping the addendum review is the most common cause of a missed scope item.
Can you use my estimate template?
Send your template with the plans and specifications, and we confirm whether the estimate can be delivered in it before the fee is quoted. The workbook and PDF summary we produce by default can be mapped to your line structure, divisions and bid form. Any mismatch in units or cost codes is resolved during plan review, not after delivery.
Do you sign NDAs?
Clients can request an NDA before sending drawings, and the terms are agreed before plan review begins. Send the draft with the plan set so the scope of confidential material is defined at the same time. We do not publish a standard NDA policy, so each agreement is handled as submitted.
How is the fee for a bid estimate set?
The fee is quoted per project after we review the plans, because the drivers are sheet count, number of divisions, the volume of subcontractor quotes to reconcile and whether alternates or unit rates are priced. A single-division Division 03 concrete package prices differently from a full building with Division 26 electrical. Send the bid documents and bid date for a quote.