Construction projects move fast, and the paperwork moves even faster. Bid documents, change orders, schedules, and contracts are full of letter combinations that can feel like a different language to anyone who is new to a job site, a real estate transaction, or a roofing project.

This guide explains 100+ common acronyms in construction in plain English. Each entry tells you what the abbreviation means and where you are likely to see it, so you can read a proposal, follow a meeting, or review an estimate with confidence.

Some abbreviations carry more than one meaning depending on context. Where that is the case, this guide lists each version separately so you can pick the right one based on the document you are reading.

100+ common acronyms in construction

AC: Actual cost

Actual cost is the total money already spent on a project at a given point in time. It is one of the core figures used in earned value analysis to compare planned spending against real spending.

ACI: American Concrete Institute

ACI is a technical organization that publishes standards, guides, and building codes for concrete design and testing. Its specifications are widely referenced in commercial construction projects across the United States.

ADA: Americans with Disabilities Act

ADA is a federal civil rights law that prohibits discrimination based on disability. In construction, ADA sets accessibility standards for ramps, doorways, restrooms, and other building features.

AEC: Architecture, engineering, and construction

AEC is an umbrella term for the three core professions that design and build the built environment. The term often appears in software, contracts, and conferences that cover work across all three fields.

AFF: Above finished floor

AFF is a notation on construction drawings that measures height from the final finished floor surface. Electricians, plumbers, and framers use this reference to position outlets, fixtures, and trim accurately.

AIA: American Institute of Architects

AIA is a professional organization representing licensed architects in the United States. AIA also publishes widely used contract templates such as the G702 and G703 payment forms.

AISC: American Institute of Steel Construction

AISC is a trade association and technical institute focused on structural steel design and fabrication. Its specifications are referenced by nearly every U.S. building code that involves steel framing.

ANSI: American National Standards Institute

ANSI oversees the development of voluntary consensus standards for products, services, and systems in the United States. Many roofing and building product certifications reference ANSI testing methods.

AOR: Architect of record

The architect of record is the licensed architect or firm responsible for the official design documents of a project. This party carries legal responsibility for the design and signs the drawings.

ASCE: American Society of Civil Engineers

ASCE is a professional association representing civil engineers in the United States and abroad. ASCE publishes the widely cited “Minimum Design Loads for Buildings and Other Structures,” which feeds into building codes.

ASTM: ASTM International

ASTM International develops voluntary technical standards for materials, products, systems, and services. Asphalt shingles, roofing membranes, and concrete all reference ASTM test standards in their specifications.

BAC: Budget at completion

Budget at completion is the total approved budget for finishing the entire project. It is the baseline figure used to track variance once actual spending begins.

BIM: Building information modeling

BIM is a process and software approach that uses 3D models to store design, construction, and operational data about a building. Project teams use BIM to coordinate trades, catch conflicts, and plan maintenance.

BOM: Bill of materials

A bill of materials is a complete itemized list of every part, component, and quantity needed to build a project. It supports purchasing, estimating, and inventory control during construction.

BOQ: Bill of quantities

A bill of quantities lists measured work items with quantities used by contractors during bidding. It allows for apples to apples comparisons between competing bids on the same scope.

CA: Construction administration

Construction administration covers the services an architect or engineer provides during the building phase. Typical duties include reviewing submittals, answering RFIs, and visiting the job site.

CAD: Computer aided design

CAD refers to software used by designers and engineers to draft and detail building plans. Common CAD programs include AutoCAD, Revit, and similar tools used for construction drawings.

CCD: Construction change directive

A construction change directive is a written order from the owner to the contractor that changes the work before a price is agreed upon. It keeps a project moving while the change order paperwork is finalized.

CD: Construction documents

Construction documents are the full set of drawings and specifications used to build a project. They include floor plans, sections, details, and written specs that contractors price and follow.

CEI: Construction engineering and inspection

CEI refers to independent oversight of a construction project on behalf of the owner. The term shows up most often on transportation and public infrastructure projects.

CM: Construction management or construction manager

CM can stand for construction management as a practice or construction manager as a role. Context determines which meaning applies in a given sentence or contract.

CMAA: Construction Management Association of America

CMAA is a nonprofit that sets standards for professional construction management. It also issues the Certified Construction Manager credential recognized across the industry.

CMAR: Construction manager at risk

Construction manager at risk is a delivery method where the CM commits to a guaranteed maximum price. The CM acts as an advisor during design and then takes on contractor risk during construction.

CMU: Concrete masonry unit

A CMU is a hollow or solid concrete block used in walls, foundations, and structural construction. The term is sometimes used interchangeably with cinder block in field conversations.

CO: Change order

A change order is a formal written agreement that modifies the contract scope, schedule, or cost. Both the owner and contractor must sign it before the change becomes part of the contract.

CO: Certificate of occupancy

A certificate of occupancy is issued by a local authority when a building is approved for use. It confirms the structure meets applicable codes and is safe to occupy.

COR: Change order request

A change order request is the contractor’s proposal for a change to the contract before formal approval. It typically includes pricing, schedule impact, and a description of the affected scope.

CPI: Cost performance index

CPI measures how efficiently project funds are being spent compared to the work completed. A CPI below 1.0 means the project is over budget, while a value above 1.0 means it is under budget.

CPM: Critical path method

Critical path method is a scheduling technique that identifies the longest sequence of dependent tasks. The activities on this path drive the overall project completion date.

CSI: Construction Specifications Institute

CSI is an organization that develops standards for organizing construction specifications. Its MasterFormat system is the basis for how most commercial specs are numbered and divided.

DB: Design build

Design build is a delivery method where a single firm handles both design and construction under one contract. It often shortens project timelines by overlapping design with early construction work.

DBB: Design bid build

Design bid build is the traditional delivery method where design finishes first, then contractors bid on the completed plans. The owner holds separate contracts with the designer and the builder.

DBE: Disadvantaged business enterprise

A DBE is a small business certified as being owned and controlled by socially or economically disadvantaged individuals. Many federally funded infrastructure projects require a percentage of work to go to certified DBEs.

DD: Design development

Design development is the phase between schematic design and construction documents. During DD, the architect refines layouts, finishes, and major systems based on the schematic concept.

DWG: Drawing

DWG is shorthand for drawing and also the file extension used by AutoCAD. The term appears on title blocks, sheet indexes, and when referring to plan sets on the job site.

EA: Each

EA is a unit of measurement for items counted as whole pieces rather than measured by length, area, or volume. Lighting fixtures, doors, and rooftop units are typically priced per EA.

EAC: Estimate at completion

Estimate at completion is the forecast of total project cost once all remaining work is finished. It is recalculated as the project progresses to reflect actual performance trends.

ECI: Early contractor involvement

Early contractor involvement brings the main contractor into the project before the design is finalized. This approach lets the builder advise on constructability, materials, and budget during design.

E&O: Errors and omissions

Errors and omissions describes mistakes, oversights, or missing details in construction drawings or specifications. The term also appears in professional liability insurance covering designers.

EOR: Engineer of record

The engineer of record is the licensed engineer or firm responsible for a project’s engineering documents. This party signs and seals the structural, mechanical, electrical, or civil drawings.

EPC: Engineering, procurement, and construction

EPC is a delivery method common in industrial, energy, and infrastructure projects. One contractor handles engineering, procurement of materials, and full construction under a single agreement.

ETC: Estimate to complete

Estimate to complete is the projected cost of the work remaining on a project. It is added to actual cost to date to calculate the estimate at completion.

EV: Earned value

Earned value represents the budgeted value of the work that has actually been completed. It is the foundation of earned value management, which compares planned, earned, and actual costs.

FFE: Furniture, fixtures, and equipment

FFE refers to movable items in a building that are not permanently attached to the structure. Owners often budget for FFE separately from base construction costs.

FF: Free float

Free float is the time an activity can slip without delaying the start of the next task. It is calculated from a critical path method schedule and helps planners manage minor delays.

GC: General contractor

A general contractor is the primary builder responsible for delivering a construction project. The GC manages subcontractors, schedules, materials, and on site safety.

GMP: Guaranteed maximum price

A guaranteed maximum price caps how much a contractor can charge for a defined scope of work. Any cost above the GMP is typically the contractor’s responsibility under the contract.

GPR: Ground penetrating radar

Ground penetrating radar is a survey technology that maps buried utilities, rebar, and voids. It is commonly used before excavation, coring, or saw cutting to avoid hidden hazards.

GSF: Gross square feet

Gross square feet measures the total enclosed floor area of a building, including walls and shafts. It is commonly used in leasing, programming, and high level cost benchmarking.

HVAC: Heating, ventilation, and air conditioning

HVAC covers the systems that manage indoor temperature, humidity, and air quality. The acronym appears throughout mechanical drawings, specifications, and trade conversations.

IAQ: Indoor air quality

Indoor air quality describes the condition of the air inside a building for occupant health. Ventilation rates, filtration, and low VOC materials all influence IAQ performance.

IFB: Invitation for bid

An invitation for bid is a formal solicitation asking contractors to submit pricing for a defined scope. Public projects often use IFBs because the award typically goes to the lowest responsible bidder.

IFC: Issued for construction

Issued for construction means a set of drawings has been finalized and approved for building. Field teams should always confirm they are working from the latest IFC set.

IPD: Integrated project delivery

Integrated project delivery is a contract approach that aligns owner, designer, and contractor through shared risk and reward. The goal is to reduce waste, conflict, and rework across the project life cycle.

LD: Liquidated damages

Liquidated damages are pre agreed sums the contractor pays the owner for each day a project finishes late. The amount is set in the contract to reflect the owner’s probable loss from delay.

LEED: Leadership in Energy and Environmental Design

LEED is a green building certification program from the U.S. Green Building Council. Buildings earn points across categories such as energy, water, materials, and indoor environmental quality.

LF: Linear foot

Linear foot is a unit of measure for length used in pricing items such as trim, piping, and curbing. Estimators often quote materials like gutters and downspouts per LF.

LOA: Letter of authorization

A letter of authorization grants someone permission to act on another party’s behalf for a specific purpose. In construction, it often allows a contractor to communicate with the insurance carrier on a homeowner’s claim.

LOI: Letter of intent

A letter of intent is a preliminary written agreement that outlines the major terms of a future contract. It often allows early work to begin while the full contract is being negotiated.

LS: Lump sum

Lump sum is a single fixed price covering a defined scope of work. It is common for items that are difficult to measure separately, such as mobilization or general conditions.

MBE: Minority business enterprise

An MBE is a business certified as at least 51 percent owned and controlled by minority individuals. Many public projects set goals for MBE participation as part of the contract.

MEP: Mechanical, electrical, and plumbing

MEP refers to the three building systems most often coordinated together in design and construction. MEP contractors are typically among the largest specialty trades on a commercial project.

MOH: Materials on hand

Materials on hand are project materials that have been delivered or stored but not yet installed. Contractors sometimes bill for MOH so they can pay suppliers before installation occurs.

MOU: Memorandum of understanding

A memorandum of understanding is a written outline of an agreement between two or more parties. It is less binding than a contract but signals serious commitment to cooperate on a project.

MSDS: Material safety data sheet

An MSDS describes the hazards, handling, and emergency procedures for a specific chemical or product. Job sites must keep MSDS records accessible to workers under OSHA hazard communication rules.

NEC: National Electric Code

The National Electric Code is the U.S. standard for safe electrical design and installation. Local jurisdictions adopt and sometimes amend the NEC to suit regional requirements.

NIC: Not in contract

Not in contract means an item shown on the drawings is excluded from the contractor’s scope. It signals that the owner or another party will furnish or install that work.

NOA: Notice of award

A notice of award is an official letter telling a bidder it has been selected for the project. It typically precedes the formal contract signing and notice to proceed.

NTP: Notice to proceed

Notice to proceed is a formal letter from the owner telling the contractor to begin work. It often marks the start of the contract time used to measure schedule performance.

NTS: Not to scale

Not to scale on a drawing means the detail or sketch does not match the printed scale. Field teams should rely on written dimensions when a drawing is marked NTS.

OAC: Owner, architect, contractor

OAC refers to the three primary parties on a commercial project. The OAC meeting is a recurring coordination meeting where these stakeholders review progress, RFIs, and changes.

OC: On center

On center is the spacing measured from the center of one element to the center of the next. Framing layouts often call out studs and joists at 16 inch or 24 inch OC.

OSHA: Occupational Safety and Health Administration

OSHA is the U.S. agency that sets and enforces workplace safety standards. Construction sites must follow OSHA fall protection, scaffolding, and personal protective equipment rules.

PCO: Potential change order

A potential change order is a contractor’s preliminary notice that a change in scope, cost, or schedule may be needed. It allows pricing and review to begin before a formal change order is executed.

PE: Professional engineer

PE is the credential held by a licensed professional engineer. A PE is authorized to sign and seal engineering drawings, calculations, and reports.

PM: Project manager or project management

PM can refer to the practice of managing a project or to the individual managing it. Both meanings are common in construction conversations and titles.

PMP: Project management plan or Project Management Professional

PMP can mean a written project management plan that guides a single project. It can also refer to the Project Management Professional certification issued by the Project Management Institute.

PO: Purchase order

A purchase order is a written commitment to buy specific goods or services at agreed prices and quantities. Subcontractors and suppliers use POs to formalize material orders on a job.

PPE: Personal protective equipment

Personal protective equipment includes hard hats, safety glasses, gloves, harnesses, and other gear that protects workers. OSHA requires employers to provide and enforce the use of appropriate PPE on construction sites.

PS&E: Plans, specifications, and estimates

PS&E is the final design package for a project, especially in transportation and public works. It includes the full drawings, written specifications, and engineer’s cost estimate.

PSI: Pounds per square inch

PSI measures pressure or material strength as force divided by area. Concrete compressive strength and pipe pressure ratings are commonly expressed in PSI.

PV: Planned value

Planned value is the budgeted cost of the work scheduled to be done by a given date. It is the baseline that earned value and actual cost are measured against.

QA: Quality assurance

Quality assurance is the planned set of processes used to make sure work meets defined standards. It focuses on building quality into the process rather than relying only on final inspection.

QC: Quality control

Quality control covers the inspections, tests, and reviews used to verify finished work. QC activities include concrete testing, roof tear off inspections, and punch list walks.

RE: Resident engineer

A resident engineer supervises field work on behalf of the owner or designer. The role is common on transportation and public infrastructure projects.

REBAR: Reinforcing bar

Rebar is the steel bar embedded in concrete to resist tension and bending. Sizes are usually called out in eighths of an inch, such as #4 or #5 bar.

RFI: Request for information

An RFI is a written question from the contractor seeking clarification on the drawings, specs, or field conditions. The architect or engineer issues a written response that becomes part of the project record.

RFP: Request for proposal

An RFP is a solicitation asking firms to submit a proposed approach, team, and price for a project. Owners often use RFPs for design, construction management, or specialty services.

RFQ: Request for quotation or qualifications

RFQ can mean a request for quotation, which seeks pricing on defined items. It can also mean a request for qualifications, which seeks team experience and resumes before pricing is requested.

ROM: Rough order of magnitude

A rough order of magnitude estimate is an early ballpark figure used during planning. The accuracy is wide, often plus or minus 25 to 50 percent of the final cost.

SD: Schematic design

Schematic design is the early phase where the architect develops the basic concept and layout. The output includes preliminary plans, elevations, and a rough scope of work for budgeting.

SF: Square foot

Square foot is a unit of area used throughout construction estimating and design. Roofing, flooring, and drywall are commonly priced per SF.

SOV: Schedule of values

A schedule of values is the contractor’s breakdown of the contract amount into line items of work. It is the basis for monthly payment applications and progress billing.

SOW: Scope of work

A scope of work describes the tasks, deliverables, and boundaries of a specific contract. Clear SOWs reduce disputes by spelling out exactly what is included and excluded.

SPI: Schedule performance index

SPI compares the value of work completed to the value planned for the same period. A value below 1.0 means the project is behind schedule, while above 1.0 means it is ahead.

SSHO: Site safety and health officer

An SSHO is a qualified professional who oversees safety on construction sites. The role is required on U.S. government and military construction projects of significant size.

SWPPP: Storm water pollution prevention plan

An SWPPP is a written plan that identifies sources of storm water pollution on a construction site. It also details the controls used to prevent sediment and chemicals from reaching nearby waterways.

TBD: To be determined

TBD marks an item that has not yet been finalized in the documents. It commonly appears on early drawings, schedules, or specs where decisions are still pending.

TI: Tenant improvement

Tenant improvement covers the buildout of a leased commercial space for a specific tenant’s use. Common TI work includes partitions, finishes, lighting, and HVAC adjustments.

TYP: Typical

TYP on a drawing means the called out condition applies to all similar elements. It saves drafters from labeling each repeating item separately.

VE: Value engineering

Value engineering is a structured review of design choices to reduce cost while keeping required performance. It often happens between schematic design and construction documents.

VOC: Volatile organic compound

VOCs are organic chemicals that easily evaporate at room temperature and contribute to indoor and outdoor air pollution. Paints, adhesives, and sealants often advertise low VOC formulations for healthier indoor air.

WBE: Women business enterprise

A WBE is a business certified as at least 51 percent owned and controlled by women. Public agencies often set participation goals for WBEs on funded construction projects.

WBS: Work breakdown structure

A work breakdown structure is a hierarchical breakdown of the entire project scope. It divides the work into manageable packages that can be estimated, scheduled, and tracked.

WIP: Work in progress

Work in progress refers to construction work that has been started but is not yet finished. WIP also appears in contractor financial reports to show earned but unbilled revenue.

WWF: Welded wire fabric

Welded wire fabric is a grid of steel wires used to reinforce concrete slabs and toppings. It functions like rebar but is laid out as a continuous mesh sheet.

Conclusion

Learning the acronyms in construction that appear on proposals and contracts is the first step toward making smarter decisions for your property. The next step is working with a contractor who uses plain language and backs every recommendation with a real inspection.

If you would rather skip the homework and talk to someone who can explain the abbreviation for construction work on your own property, Alliance EDS is ready to help. Call us at (720) 484-8181 to schedule a free inspection today!