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PENNSYLVANIA CONSTRUCTION ESTIMATING

Construction Estimating Glossary

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Construction estimating terms describe different quantities, costs, and responsibilities. Use this glossary to read a takeoff, compare supplier quotations, or discuss a bid worksheet with your team. Definitions are general explanations; the project contract and applicable requirements determine their specific use. Ask for clarification whenever a term changes the scope or meaning of a price.

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What do these estimating terms mean?

Takeoff
Measurement of construction work from drawings and specifications.
Quantity takeoff
A schedule of measured counts, lengths, areas, volumes or weights.
Material takeoff
A material schedule that may convert installed quantities into purchasing units.
Unit cost
Cost assigned to one defined unit of measured work.
Allowance
A stated provision for an unresolved item with defined coverage.
CSI MasterFormat
A classification system for organizing construction information by work result.
General conditions
Project-specific support costs such as supervision and temporary facilities.
Contingency
A separate provision for identified uncertainty rather than known scope.
Overhead
Business operating costs not directly attributed to one measured installation.
Markup
An addition expressed relative to the underlying cost.
Margin
Profit expressed relative to the selling price.
Bid bond
A bond associated with a bidder’s obligations under the applicable tender terms.
Base bid
The offer for the principal tender scope before separate alternates.
Alternate
A separately identified addition, deduction or substitute scope.
Addendum
A formal update to tender documents.
RFI
A request for information used to clarify a project question.
Change order
An authorized contractual change under the project’s approval process.
Change estimate
A cost comparison for added and omitted scope.
Scope
The work and responsibilities covered by a defined package.
Inclusion
An item expressly covered by the estimate or offer.
Exclusion
An item expressly outside the package.
Assumption
A stated basis used where information or a decision is incomplete.
Labor unit
An installation-hour basis per defined unit of work.
Productivity
Output relative to time or resources for stated conditions.
Waste factor
An explicit allowance for cutting, laps or other procurement loss.
Net quantity
Measured installed work before purchasing adjustments.
Gross quantity
A quantity before specified deductions; its basis must be stated.
Bill of quantities
A structured schedule of measured work for pricing or comparison.
Bill of materials
A list of components or products required for a defined assembly.
Assembly
A group of components forming a specified construction system.
Drawing scale
The relationship between drawing distance and represented distance.
Datum
A reference elevation or coordinate used for measurement.
Cut and fill
Excavation and placed material measured against existing and proposed surfaces.
Swell
An identified change from in-place to loose material volume.
Compaction
The densification of placed material under specified requirements.
Formwork
The temporary or permanent form defining placed concrete geometry.
Rebar
Steel reinforcement specified for concrete construction.
Flashing
A detailed component directing water at an envelope junction or penetration.
Submittal
Product or construction information submitted for required review.
Lead time
Time between an order or approval and the required availability.
Quote validity
The period and conditions for which a quotation is offered.
Prevailing wage
Required compensation under applicable public-work rules and determinations.
UCC
Pennsylvania’s Uniform Construction Code framework.
HICPA
Pennsylvania’s Home Improvement Consumer Protection Act.
Buyout
The process of placing trade or supply commitments after award.
Value engineering
Evaluation of approved alternatives for function, scope and cost.
Commissioning
Specified verification and documentation of building-system operation.
Cost per square foot
A cost divided by a stated area; scope and area definitions are essential.
Procurement quantity
The quantity intended for purchasing after stated packaging or waste adjustments.
Scope leveling
Comparing quotations on a consistent coverage basis.

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