Construction Glossary: 70 Terms for Building Product Professionals

How to use this glossary

Each entry gives a plain-English definition, then a short line on why it matters if you sell building products, supply materials, or prospect for commercial work as a contractor.

Most terms belong to a project stage: planning, design, bidding, or construction. When a term shows up in a project record or a meeting, it tells you how far along the project is and who is making decisions. The stage table after the glossary pulls this together.

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A to C terms

Addendum

A written change to the bid documents, issued by the owner or architect before bids are due. An addendum can revise drawings or specifications, correct errors, answer bidder questions, or move the bid date, and it becomes part of the contract.

Why it matters: A product named in the original specification can be removed, or a competitor added, by addendum. Read every addendum on projects where you are specified.

Allowance

A set dollar amount carried in the contract for work or materials that have not been fully selected yet, such as finishes, hardware, or fixtures. When the actual selection is made, the contract price is adjusted to match the real cost.

Why it matters: Allowance items are still open decisions after the contract is signed, so they are a chance to put your product in front of the owner or designer.

Alternate (Bid Alternate)

A separate price, submitted with the base bid, for a defined change to the scope, such as an added wing, an upgraded roof, or a different material. The owner can accept or reject each alternate after bids come in.

Why it matters: If your product appears only as an alternate, it can be accepted or dropped based on budget. Know the price gap between the base bid and your alternate.

Architect of Record (AOR)

The licensed architect or architecture firm that seals the construction documents and takes legal responsibility for the design. Other firms may contribute to the design, but the AOR signs off on the drawings and specifications.

Why it matters: The AOR’s team, including its spec writer, decides which products the specifications name. It is a primary contact when you are working to get specified.

Base Bid

The contractor’s price for the scope defined in the bid documents, not counting alternates. Owners use the base bid to compare bidders on equal terms.

Why it matters: Products in the base bid are part of the core scope. Products that appear only in alternates can be cut when bids come in over budget.

Basis of Design (BOD)

The specific product named in a specification as the standard for performance, quality, and appearance. Other manufacturers may be allowed if they show their product is equal, but the basis of design sets the bar. In mechanical and electrical work, the term can also mean a document that records the design criteria.

Why it matters: Being the basis of design is a strong position. Competitors have to prove they match your product, not the other way around.

Bid Bond

A surety bond submitted with a bid that guarantees the bidder will sign the contract at its bid price if selected. If the winning bidder walks away, the surety compensates the owner, up to the bond amount.

Why it matters: Bid bonds are common on public work. A contractor that cannot get one cannot bid those jobs, which limits the projects it can pursue.

Bid Date

The deadline, set in the bid documents, by which bids must be submitted. On public work, sealed bids are usually opened and read aloud at a public bid opening at that time. Private owners may review bids privately.

Why it matters: Product decisions harden as the bid date nears. Subcontractors and suppliers usually need to send pricing to bidding contractors before the bid date itself.

Bid Package

The set of documents bidders need to price a project or part of one: drawings, specifications, bid forms, instructions, and addenda. General contractors also split a project into trade bid packages, such as roofing or drywall, and send each one to subcontractors.

Why it matters: Your product’s specification section sits inside a bid package. Knowing which package covers your scope tells you which subcontractors to call.

Bid Tabulation (Bid Tab)

A side-by-side list of every bid received on a project, usually showing base bids and alternates. Public agencies often publish bid tabs after the bid opening.

Why it matters: A public bid tab shows who bid, at what price, and who the apparent low bidder is. That contractor is the one to call next.

BIM (Building Information Modeling)

A process for designing and managing a building with a shared digital model that holds data about each element, such as size, material, and performance, along with its geometry. Architects, engineers, and contractors use the model to coordinate the design and plan construction.

Why it matters: When your products are available as BIM objects, designers can place them straight into the model. Learn more in our guide to building information modeling (BIM).

Bonding Capacity

The amount of bonded work a contractor’s surety will back, both on a single project and across all of its open projects at once. It is based on the contractor’s finances, experience, and track record.

Why it matters: Bonding capacity caps the size of public work a contractor can bid. It is a quick way to judge whether a contractor fits a large job.

Building Permit

Official approval from the local building department to build, alter, or demolish a structure, issued after the department reviews the plans for code compliance. Most work cannot legally start without one.

Why it matters: Permit filings are public and can reveal projects, but by the time a permit is issued, most products have been chosen. Our guide to construction reports and permit data explains how to use them.

Certificate of Occupancy (CO)

A document from the local building department confirming that a finished building meets code and can be occupied. A temporary certificate may allow partial use while final items are completed.

Why it matters: The CO date tells you when the owner will start using the building, which matters if you sell furnishings, equipment, or services bought at move-in.

Change Order

A written amendment, made after the contract is signed, that changes the scope, price, or schedule. Change orders cover design changes, owner requests, and unforeseen site conditions, and are signed by the owner and contractor, often with the architect.

Why it matters: A change order can reopen a product decision, for example when an owner upgrades a finish or a specified product becomes unavailable.

Construction Documents (CDs)

The final, detailed drawings and specifications used for permitting, bidding, and construction. It is also the name of the design phase, after design development, in which the architect completes them.

Why it matters: Specification language is finalized during the CD phase. If you are not named by the end of it, you will usually need a substitution request to get in.

Construction Lead

Information about a specific upcoming construction project, including its location, type, value, stage, timeline, and the people involved, found early enough for a seller to act on it. A useful lead names a decision-maker you can contact, not just a project in the news.

Why it matters: The earlier you find a lead, the more decisions are still open. See how to find construction leads for seven proven channels.

Construction Manager at Risk (CMAR)

A delivery method in which the owner hires a construction manager during design to give preconstruction advice, then to build the project under a guaranteed maximum price. The CM takes on the risk of finishing within that price. It is also called CM at-risk.

Why it matters: Because the CM joins during design, it often helps shape product and system choices. Treat the CM as an early contact alongside the architect.

Construction Project Data

Structured information about planned and active construction projects: location, owner, facility type, estimated value, stage, timeline, contacts, and often a materials list. Sellers use it to find, sort, and prioritize projects.

Why it matters: Manufacturers use project data to reach architects and contractors while products are still being chosen. See how manufacturers use project data to win specifications.

Cost-Plus Contract

A contract in which the owner pays the contractor’s actual costs for labor, materials, and equipment, plus a fee for overhead and profit. The fee may be a fixed amount or a percentage of cost, and many cost-plus contracts add a guaranteed maximum price.

Why it matters: The owner sees the real costs, so product price and value get close review. Clear pricing and performance data help your product hold its place.

CSI MasterFormat

The standard system for organizing construction specifications into numbered divisions and sections, published by the Construction Specifications Institute (CSI) and Construction Specifications Canada (CSC). Divisions run from 00 to 49. For example, Division 07 covers thermal and moisture protection, and Division 08 covers openings such as doors and windows.

Why it matters: Knowing your division and section numbers lets you find your product in any project manual in minutes and filter project data by the work you sell.

D to L terms

Design-Bid-Build

The traditional delivery method. The owner hires an architect to complete the design, then bids the finished documents to contractors and usually awards to the lowest qualified bidder. Design and construction are separate contracts carried out one after the other.

Why it matters: The architect controls the specification, so the design phases are your main window. Once the project is out to bid, most product choices are set.

Design-Build

A delivery method in which one entity, the design-builder, holds a single contract with the owner for both design and construction. Design and construction often overlap, which can shorten the schedule.

Why it matters: The builder has a say in products from the start, so reach the design-build team, not only the architect. Compare the two methods in design-build vs. design-bid-build.

Design Development (DD)

The second design phase, after schematic design. The architect and engineers refine the plans, choose building systems and materials, and often prepare outline specifications.

Why it matters: Product selections narrow during design development. It is a strong time to give the design team samples, data, and pricing.

Escalation Clause

A contract provision that lets the price change if the cost of named materials or labor rises, or sometimes falls, past an agreed point. It usually requires documentation of the change.

Why it matters: If you quote materials with volatile prices, find out whether the contract has one. It decides who absorbs a price increase between bid and delivery.

Fast-Track Construction

A schedule in which construction starts before the design is finished, with early packages such as site work and foundations released first. Design and construction overlap to shorten the overall timeline.

Why it matters: On fast-track jobs, product decisions are made package by package and on short deadlines. Be ready to respond quickly.

General Conditions

The part of a construction contract that sets the rights and duties of the owner, contractor, and architect, including payment, insurance, changes, and disputes. Standard forms such as AIA Document A201 in the U.S. and the CCDC contracts in Canada are common. Contractors also use the term for job-site overhead, such as supervision and temporary facilities.

Why it matters: General conditions set payment and change procedures that flow down to subcontractors and suppliers, so they affect when and how you get paid.

General Contractor (GC)

The company that holds the main construction contract with the owner. The GC runs the job site, hires and schedules subcontractors, buys or approves materials, and delivers the finished building.

Why it matters: On most commercial projects, the GC is your customer or your customer’s customer. Contractors looking for their next job will find more in our guide to contractor leads.

GMP (Guaranteed Maximum Price)

A contract price cap. The contractor is paid its actual costs plus a fee, but the owner will not pay more than the agreed maximum except through approved change orders. Costs above the cap are the contractor’s responsibility, and savings below it are often shared or returned to the owner.

Why it matters: Contractors working under a GMP have a strong reason to control cost. A product that meets the specification for less has a solid value engineering case.

Hard Bid

A competitive process in which contractors submit sealed, fixed-price bids on complete construction documents, and the contract usually goes to the lowest responsive, responsible bidder. Public projects are often awarded this way.

Why it matters: Price drives hard-bid work. Subcontractors and suppliers compete on numbers, so the specification has to be won before the bid.

Integrated Project Delivery (IPD)

A delivery method in which the owner, architect, builder, and often key trades sign one multi-party agreement and share the project’s risk and reward. The team works together from early design.

Why it matters: Key trades and suppliers can join an IPD team early, so product decisions are made together and sooner than on traditional projects.

Invitation to Bid (ITB)

A formal request to submit a bid on a defined scope, with the documents, instructions, and deadline. Public agencies issue ITBs openly to any qualified bidder, while general contractors send them to a selected list of subcontractors and suppliers. It is also called an invitation for bids (IFB).

Why it matters: Getting on a GC’s bid list means you receive its ITBs automatically. For subcontractors and suppliers, that list is a key business development goal.

Lead Verification

The process of confirming that a project is real and current, and that the listed contact is the right person, before a lead is used or published. Methods range from automated collection of public records to phone calls with owners, architects, and contractors.

Why it matters: Unverified leads waste sales time on stale projects and wrong contacts. Construct-A-Lead’s research team confirms every project by phone. See how we verify every project.

Letter of Intent (LOI)

A letter from an owner or general contractor stating that it intends to award a contract, issued before the formal contract is signed. Some letters of intent also authorize limited early work or material orders.

Why it matters: An LOI is a strong sign that a contractor has the job. It is a good moment to contact that contractor about your scope.

Lien Waiver

A document in which a contractor, subcontractor, or supplier gives up its lien rights for the amount it has been paid. A conditional waiver takes effect only once payment clears; an unconditional waiver takes effect when signed.

Why it matters: Suppliers are routinely asked for lien waivers to get paid. Never sign an unconditional waiver for money you have not received.

Liquidated Damages (LDs)

A daily amount, set in the contract, that the contractor owes the owner for each day the project finishes late. It is an agreed estimate of the owner’s losses from delay, not a penalty.

Why it matters: Contractors facing liquidated damages care about lead times, so reliable delivery dates are a selling point.

Lump Sum (Stipulated Sum)

A contract in which the contractor agrees to complete the defined scope for one fixed price. The contractor carries the risk of cost overruns and keeps any savings. In Canada it is often called a stipulated price contract.

Why it matters: On lump-sum work, the contractor keeps the savings from a lower-cost product, so equal-performance alternatives get a hearing during buyout.

M to P terms

Mechanic's Lien

A legal claim against a property by a contractor, subcontractor, or supplier that has not been paid for work or materials on it. In Canada it is usually called a construction lien or builders’ lien. Filing deadlines are strict and vary by state and province.

Why it matters: Lien rights protect suppliers from nonpayment, but only if notices and deadlines are met. Know the rules where you ship.

Negotiated Bid

A procurement method in which the owner picks a contractor based on qualifications, then negotiates the price, instead of awarding to the low bidder. It is common on private projects.

Why it matters: Negotiated work rewards relationships. Contractors chosen this way often join early, while products are still open.

Notice to Proceed (NTP)

A written notice from the owner telling the contractor to start work. The contract time, and any liquidated damages, are usually counted from the NTP date.

Why it matters: After NTP, buyout and material orders move quickly. Your product should already be specified or approved by then.

Or-Equal

Specification language, such as or equal or or approved equal, that allows products other than the ones named if the architect accepts them as equal in quality and performance.

Why it matters: If you are named, expect competitors to submit equals. If you are not, an or-equal clause is your way in.

Owner's Representative (Owner's Rep)

A professional or firm hired by the owner to manage its interests through design and construction. The owner’s rep coordinates the architect and contractor, tracks budget and schedule, and often makes day-to-day decisions.

Why it matters: On complex projects, the owner’s rep can steer product choices the owner cares about, such as durability and maintenance cost.

Payment Bond

A surety bond guaranteeing that the contractor will pay its subcontractors, workers, and suppliers. In the U.S., the federal Miller Act and state laws often called Little Miller Acts require payment bonds on most public construction, where liens usually cannot be placed on the property.

Why it matters: On public projects, a claim against the payment bond is how an unpaid supplier gets paid. Notice deadlines apply.

Performance Bond

A surety bond guaranteeing that the contractor will finish the work according to the contract. If the contractor defaults, the surety arranges completion or compensates the owner, up to the bond amount.

Why it matters: Performance bonds are usually required with payment bonds on public work, so only bondable contractors can pursue those projects.

Plan Room

A physical or online place where contractors and suppliers can view or download the plans, specifications, and addenda for projects out to bid. Builders’ exchanges, reprographics firms, and online services run them.

Why it matters: Plan rooms show what is bidding now and which products the specifications call for. By that point, the design is mostly set.

Pre-Bid

Describes a project that has not yet gone out to bid, usually because it is still in planning or design. It also refers to steps just before bidding opens, such as a pre-bid meeting.

Why it matters: Pre-bid projects still have open decisions about the team and the products. That is when outreach has the most influence.

Pre-Bid Meeting

A meeting held by the owner or architect before bids are due to walk bidders through the project and answer questions. Attendance may be mandatory or optional, and skipping a mandatory meeting can disqualify a bid.

Why it matters: The sign-in sheet shows who is bidding, and the questions show what the owner cares about. Both help you target the right contractors.

Preconstruction

The planning work a contractor does before building starts: estimating, scheduling, constructability review, value engineering, permitting, and buying out subcontracts and materials. Under CM at-risk or design-build, preconstruction services often begin during design.

Why it matters: Preconstruction is often the last chance to influence products before orders are placed. Reach the contractor’s preconstruction or estimating team.

Pre-Qualification

The review an owner or general contractor does of a contractor’s or supplier’s finances, experience, safety record, and capacity before allowing it to bid. Firms that are not prequalified may never receive the invitation to bid.

Why it matters: Send prequalification packages to the main GCs in your territory before a project comes up. Being on file is how you get invited.

Prevailing Wage

The minimum hourly wage and benefits that must be paid to workers on many public construction projects, set by government for each trade and area. In the U.S., the Davis-Bacon Act covers federally funded construction, and many states have their own laws.

Why it matters: Prevailing wage raises labor cost on public work, so products that cut installation time can be easier to justify.

Project Delivery Method

The way an owner organizes the contracts for design and construction. The main methods are design-bid-build, design-build, construction manager at risk, and integrated project delivery.

Why it matters: The delivery method tells you who chooses products and when. Check it before you plan outreach on a project.

Project Stage

Where a project stands in its life cycle, usually tracked as planning, design, bidding, and construction. Project records list the stage so you can tell which decisions are still open.

Why it matters: Stage tells you who to call and what you can still influence. The stage table below shows what happens in each one.

Punch List

A list, made near the end of construction, of work that is unfinished or does not meet the contract. The architect and owner usually prepare it during a walk-through, and the contractor must fix every item before final completion and payment.

Why it matters: Punch list items can mean callbacks for installers and suppliers. Clean installs and complete paperwork help a project close out on time.

Purchase Order (PO)

A buyer’s written order to a supplier listing the products, quantities, prices, and delivery terms. Once the supplier accepts it, the PO is a binding agreement.

Why it matters: The PO is where a specification turns into revenue. Check that it matches the approved submittal before you ship.

R to Z terms

Retainage (Holdback)

A percentage of each progress payment that the owner withholds from the contractor, and the contractor withholds from subcontractors, until a set milestone, often substantial completion. In Canada, provincial lien laws require a similar holdback.

Why it matters: Retainage delays part of your payment, sometimes for months. Factor it into pricing and cash flow on long projects.

RFI (Request for Information)

A formal written question, usually from the contractor to the architect or engineer, asking for clarification of the drawings or specifications. The written answer becomes part of the project record and can lead to an addendum or change order.

Why it matters: An RFI about your product signals confusion in the documents. A fast, clear answer from you can protect the specification.

RFP (Request for Proposal)

A request for firms to submit a full proposal, covering approach, qualifications, schedule, and price, for a defined scope. Owners use RFPs to select architects, construction managers, and design-build teams when they want to weigh more than price.

Why it matters: An RFP for a construction manager or design-builder means a project is moving. The firm selected will soon be shaping products and subcontracts.

RFQ (Request for Qualifications)

A request for firms to show their experience and capabilities, usually without price. Owners use it to build a shortlist of firms invited to the next round, often an RFP or interview. In purchasing, RFQ can also mean request for quotation, which asks for price.

Why it matters: An RFQ is one of the earliest public signs that an owner is assembling its project team.

ROM Estimate (Rough Order of Magnitude)

An early, approximate cost estimate based on limited design information, such as building type and square footage. It is used to test feasibility and set a budget, and its accuracy range is wide.

Why it matters: A ROM estimate means the project is still in planning. The budget it sets will shape which products survive design.

Schematic Design (SD)

The first design phase, in which the architect sets the building’s overall layout, size, and look, and proposes major systems and materials. The owner approves schematic design before design development starts.

Why it matters: Schematic design is the earliest point to influence product choices. Reaching the architect now gives you the most time to shape the specification.

Shop Drawings

Detailed drawings prepared by a subcontractor, fabricator, or manufacturer that show how a product or system will be made and installed. They are submitted for the architect’s review before fabrication.

Why it matters: Accurate shop drawings keep your product approved and on schedule. Errors lead to resubmittals and delays.

Specification (Spec)

The written part of the construction documents that sets quality, performance, and installation requirements for materials and systems, and often names acceptable products or manufacturers. Specifications are organized by MasterFormat and bound into the project manual.

Why it matters: Being written into the specification is the strongest position a manufacturer can hold. Learn how to get your product specified.

Spec Writer (Specifier)

The person who writes a project’s specifications, either on the architect’s staff or as an independent consultant. Many hold credentials from CSI, such as the Certified Construction Specifier (CCS).

Why it matters: The spec writer decides how your product is named and whether equals are allowed. Accurate, ready-to-use specification language makes their job easier.

Subcontractor (Sub)

A company hired by the general contractor to perform a specific trade or scope, such as electrical, plumbing, roofing, or drywall. Subcontractors perform much of the physical work on commercial projects.

Why it matters: Subs often buy and install the products specified for their scope, so they are direct customers for manufacturers and distributors.

Submittal

Product data, samples, shop drawings, and other documents the contractor sends to the architect to show that the proposed products meet the specification. The architect approves, approves with comments, or rejects each one.

Why it matters: An approved submittal is the last gate before your product is ordered. Give contractors complete, accurate submittal packages.

Substantial Completion

The point at which the work is complete enough for the owner to use the building for its intended purpose, even if punch list items remain. It often triggers the release of retainage, the start of warranties, and the end of liquidated damages.

Why it matters: Warranty periods for your product often start at substantial completion. Know the date so you can plan follow-up.

Substitution Request

A contractor’s formal request to use a product other than the one specified. The request must show that the substitute meets or exceeds the specified product, and the architect decides whether to accept it.

Why it matters: Substitutions are possible but never guaranteed. Being specified from the start is a much stronger position.

Surety Bond

A three-party guarantee in which a surety company backs a contractor’s obligations to the owner. The contractor is the principal and the owner is the obligee. Bid, performance, and payment bonds are all surety bonds.

Why it matters: A contractor’s ability to get bonded is a quick read on its financial strength.

Takeoff (Quantity Takeoff)

Measuring and counting the materials a project needs from its drawings, such as square feet of drywall, linear feet of pipe, or cubic yards of concrete. Estimators use takeoffs to build their price, usually with digital takeoff software.

Why it matters: A takeoff tells you how much of your product a project needs. Offering takeoff help can strengthen your relationship with an estimator.

Value Engineering (VE)

A structured review of a design to cut cost without giving up the function or performance the owner needs. It can happen during design or preconstruction and often leads to product substitutions or system changes.

Why it matters: Value engineering can remove a specified product or open the door to yours. Have clear cost and performance data ready to defend or win the spec.

What are the stages of a construction project?

Most commercial projects move through four stages. Each one has its own vocabulary, and each one changes who you should call.

The earlier you reach a project, the more you can influence. Construct-A-Lead finds projects in planning and design, often before they go to bid, and each record includes the project’s stage. Learn how to find construction projects before they go to bid.