Commercial construction covers everything from retail build-outs and office renovations to ground-up light commercial projects. Whether you are a business owner, property manager, or tenant planning a build-out, you will likely run into specialized terms during permitting, design, and construction that are unfamiliar. This glossary covers 357 terms used throughout commercial and light commercial construction, from site work and permitting to structural systems, building systems, and project closeout, so you can communicate clearly with your builder and understand every phase of your project.
A
Accessible Parking Space
A designated parking space, including required clearances and signage, reserved for use by people with disabilities.
Accessible Restroom
A restroom designed and dimensioned to meet ADA clearance, fixture height, and grab bar requirements.
Accessible Route
A continuous, unobstructed path that people with disabilities can use to move through a building.
Accessible Route of Travel
The specific path required by code connecting a public entrance to all required accessible elements within a building.
Acoustic Ceiling Tile (ACT)
Lightweight tiles set into a ceiling grid to control sound and conceal ceiling plenum space.
ADA (Americans with Disabilities Act)
Federal civil rights legislation requiring commercial buildings to be accessible to people with disabilities.
Adaptive Reuse
The process of repurposing an existing building for a new use different from its original design intent.
Addendum
A written modification to the bid documents issued before contract award.
Aggregate
Sand, gravel, or crushed stone used as a component of concrete and asphalt.
AIA Contract Documents
A widely used family of standardized construction contract forms published by the American Institute of Architects.
Air Handling Unit (AHU)
Equipment that circulates and conditions air, typically working with a separate heating or cooling source.
Allowance
A budgeted amount included in a contract for an item not yet fully specified, to be reconciled once selections are finalized.
ALTA Survey
A detailed land survey meeting standards set by the American Land Title Association, commonly required for commercial real estate transactions.
Amperage (Amps)
A measure of electrical current, used to size circuits and equipment.
Architect of Record (AOR)
The licensed architect legally responsible for the design documents submitted for permitting.
As-Built Documentation
The final set of drawings and records reflecting the actual completed condition of the project.
As-Built Drawings
Drawings updated to reflect the actual final condition of construction, including any field changes.
Asphalt
A petroleum-based material used for paving parking lots and drive surfaces.
Attic Stock
Extra materials (tile, paint, flooring) left with the owner at project completion for future repairs or matching replacements.
Automatic Transfer Switch (ATS)
Equipment that automatically switches a building's power source from utility to backup generator during an outage.
Awning
A fabric or metal cover attached to a building providing shade or weather protection over a window, door, or walkway.
B
Backflow Preventer
A plumbing device that prevents contaminated water from flowing back into the potable water supply.
Baseline Schedule
The originally approved project schedule against which actual progress is measured.
Beam
A horizontal structural member that carries load across a span to columns or walls.
Bid Bond
A bond submitted with a bid guaranteeing the bidder will enter into a contract if awarded the project.
Big Box Retail
A large-format, standalone retail building type.
Boiler
Equipment that heats water or produces steam used for building heating systems.
Boom Lift
An aerial work platform used to elevate workers and tools for overhead or high-reach tasks.
Branch Circuit
A wiring circuit extending from a panel to the outlets, fixtures, or equipment it serves.
Brick
A fired clay masonry unit used for structural or veneer wall construction.
Brick Veneer
A single-wythe layer of brick applied over a structural backup wall for aesthetic purposes.
Build-Out
General term for the interior construction work completed to finish a space for occupancy.
Build-to-Suit
A building constructed to the specific requirements of a known future tenant or owner.
Builder's Risk Insurance
Insurance covering a building under construction against damage from fire, weather, and other covered perils.
Building Automation System (BAS)
A centralized control system that monitors and manages a building's mechanical and electrical systems.
Building Code
The set of regulations governing minimum construction standards for safety, structure, and systems.
Building Envelope
The complete exterior shell of a building, including walls, roof, windows, and doors, that separates interior conditioned space from the outdoors.
Building Envelope Air Sealing
Construction measures taken to minimize uncontrolled air leakage through a building's exterior assemblies.
Building Envelope Performance
The measured or calculated efficiency of a building's exterior assemblies in resisting heat transfer and air leakage.
Building Information Modeling (BIM)
A 3D digital model of the building used to coordinate design, systems, and construction sequencing.
Building Official
The local government representative responsible for reviewing permits and inspecting construction for code compliance.
Building Permit
Official government approval required before starting construction, confirming plans meet applicable codes.
Built-Up Roofing (BUR)
A traditional roofing system made of alternating layers of bitumen and reinforcing fabric.
C
Caisson
A large-diameter drilled foundation shaft, often used for heavy structural loads or poor surface soil conditions.
Canopy
A projecting roof structure providing weather protection at an entrance or drive-through.
Casework
Built-in cabinetry, shelving, or counters fabricated for a specific space.
Cast-in-Place Concrete
Concrete poured and cured directly in its final structural location.
Ceiling Grid (Suspended Ceiling)
A metal framework suspended from the structure above that supports acoustic ceiling tiles.
Certificate of Insurance (COI)
A document verifying that a contractor or subcontractor carries required insurance coverage.
Certificate of Occupancy (CO)
A document issued by the local building authority confirming a building is safe and legal to occupy.
Certificate of Substantial Completion
A formal document marking the date a project reached substantial completion, often starting warranty periods.
Change of Use / Change of Occupancy
A permit process required when a building's use changes to a different occupancy classification.
Change Order
A formal document modifying the original contract scope, cost, or schedule.
Chiller
Large mechanical equipment that produces chilled water used to cool a building's air handling systems.
Civil Engineer
An engineer responsible for site grading, drainage, utilities, and other site infrastructure design.
Cleanout
An accessible fitting in a drainage line allowing maintenance access for clearing blockages.
Clearing and Grubbing
Removal of vegetation, brush, and roots from a construction site before grading begins.
CMU (Concrete Masonry Unit)
A precast concrete block used in structural and non-structural wall construction.
Code Official
The jurisdiction's authority responsible for interpreting and enforcing building codes.
Column
A vertical structural member that transfers loads from beams or floors down to the foundation.
Commissioning (Cx)
A quality assurance process that verifies building systems are installed and functioning according to design intent.
Commissioning Agent
A third-party professional who verifies building systems perform as designed before occupancy.
Compaction
The process of mechanically compressing soil to increase its density and load-bearing capacity.
Competent Person
An individual designated under OSHA regulations as capable of identifying jobsite hazards and authorized to take corrective action.
Competitive Bid
A procurement process where multiple contractors submit priced proposals and the contract is awarded based on price and qualifications.
Concrete
A composite building material made of cement, aggregate, and water, widely used in foundations, slabs, and structural elements.
Concrete Masonry Unit (CMU)
A standard concrete block used in structural and non-structural wall construction.
Concrete Pump
Equipment used to convey wet concrete from a truck to a specific placement location on a jobsite.
Conditional Use Permit
Approval allowing a use not normally permitted in a zoning district, subject to specific conditions.
Conduit
Tubing used to protect and route electrical wiring throughout a building.
Confined Space
A space with limited entry or exit and not designed for continuous occupancy, requiring special safety procedures to enter.
ConsensusDocs
An alternative set of standardized construction contract documents used across the industry.
Constructability Review
A preconstruction review of design documents to identify potential construction issues before bidding.
Construction Documents (CDs)
The complete set of drawings and specifications used to bid and build the project.
Construction Loan
A short-term loan used to finance construction, typically converted to permanent financing upon completion.
Construction Manager (CM)
A professional who manages the construction process on behalf of the owner, often involved from early design through completion.
Construction Manager as Agent (CMa)
A delivery method where the construction manager acts purely as the owner's representative without holding the construction contract directly.
Construction Manager at Risk (CMAR)
A delivery method where a construction manager is brought on during design to advise on cost and constructability, then commits to a guaranteed maximum price for construction.
Contingency
A budgeted allowance set aside to cover unforeseen costs during construction.
Continuous Footing
A footing running beneath a foundation wall for its full length.
Cool Roof
A roofing system designed with reflective properties to reduce heat absorption and lower cooling loads.
Cooling Tower
Equipment that rejects heat from a building's chiller system into the atmosphere.
Coping
A protective cap installed on top of a parapet wall to shed water.
Cost per Square Foot
A common metric used to compare or estimate construction costs across projects of different sizes.
Cost-Plus Contract
A contract where the owner pays actual project costs plus an agreed fee, often used when scope is not fully defined at the outset.
Crane
Heavy lifting equipment used to move materials, structural components, or equipment on a jobsite.
Critical Path
The sequence of dependent tasks in a project schedule that determines the shortest possible completion time.
Critical Path Method (CPM) Schedule
A scheduling technique that identifies task dependencies and the critical path to manage project timing.
Curb and Gutter
Concrete edging along a roadway or parking area that channels stormwater and defines pavement edges.
Curb Ramp
A sloped transition built into a curb to allow wheelchair access between a sidewalk and street or parking area.
Curtain Wall
A non-load-bearing exterior wall system, typically glass and metal framing, that hangs from the building's structural frame.
Curtain Wall Glazing
Glass panels set into a curtain wall framing system forming a building's exterior skin.
Cut and Fill
The earthwork process of removing soil from higher areas (cut) and depositing it in lower areas (fill) to achieve design grades.
D
Daylighting
Design strategies that use natural light to reduce reliance on artificial lighting.
Deflection
The degree to which a structural member bends under load, a key factor in structural design limits.
Demising Wall
A wall separating one tenant's space from another tenant's space or from common areas.
Design Development (DD)
The design phase refining the schematic concept into more defined systems, materials, and dimensions.
Design-Bid-Build
A traditional delivery method where design is completed first, then contractors bid on the finished design, then construction begins.
Design-Build
A delivery method where one entity holds a single contract for both design and construction, streamlining communication and accountability.
Detail Drawing
An enlarged drawing showing precise construction of a specific condition, such as a wall section or connection.
Detectable Warning Surface
A textured surface installed at curb ramps and transit platforms to alert visually impaired individuals to a change in grade.
Detention Pond
A stormwater basin designed to temporarily hold runoff and release it slowly to reduce downstream flooding.
Developer
An entity that plans, finances, and oversees a project, often with the intent to lease or sell the completed property.
Differing Site Conditions
A contract clause addressing unforeseen physical conditions at a site that differ materially from those indicated in the contract documents.
Diffuser
A ceiling or wall device that distributes conditioned air into a room.
Domestic Water System
The building plumbing system supplying potable water for drinking, washing, and general use.
Door Hardware
Components such as locksets, closers, and hinges required for a functioning commercial door.
Draw Request (Pay Application)
A contractor's formal request for payment based on completed work to date.
Draw Schedule
A predetermined schedule of payment installments released during construction, typically tied to project milestones.
Drywall (Gypsum Board)
A panel product used to finish interior walls and ceilings.
Ductwork
The network of sheet metal or fabric passages that distribute conditioned air throughout a building.
E
Easement
A legal right allowing use of a portion of property by another party (utility lines, shared access, etc.) that can restrict building placement.
Economizer
An HVAC control feature that uses outside air for cooling when conditions allow, reducing mechanical cooling load.
Egress
The code-defined means of exiting a building safely in an emergency, including exit paths, doors, and stairways.
Egress Lighting (Exit Lighting)
Illuminated signage and lighting required to mark and light the path of egress during an emergency.
EIFS (Exterior Insulation and Finish System)
A synthetic exterior wall cladding system providing insulation and a stucco-like finish.
Electrical Service
The point where utility power enters a building and is distributed to the building's electrical system.
Elevation Drawing
A drawing showing the exterior (or interior) face of a building from a single vantage point.
Emergency Lighting
Battery-backed or generator-backed lighting that activates automatically during a power outage to illuminate egress paths.
Emergency Power
Backup electrical power (generator or battery) required to serve life safety systems during a utility outage.
Energy Code
Building code requirements establishing minimum energy efficiency standards for a building's envelope and systems.
Energy Recovery Ventilator (ERV)
Equipment that transfers energy between incoming and outgoing air streams to improve HVAC efficiency.
Engineered Wood Products
Manufactured wood products (LVL, glulam, I-joists) used to achieve structural spans or strength beyond standard lumber.
Environmental Review
A regulatory review process assessing a project's potential environmental impact before approval.
EPDM Roofing
A synthetic rubber single-ply roofing membrane used on commercial low-slope roofs.
Erosion Control
Measures (silt fences, sediment basins, etc.) used to prevent soil erosion and sediment runoff during construction.
Estimator
A professional responsible for calculating projected project costs during preconstruction.
Excavator
Heavy equipment used for digging, grading, and earthmoving.
Exhaust Fan
Equipment that removes air (and often odors, heat, or contaminants) from a specific space to the outdoors.
F
Facade
The exterior face of a building, often referring to its primary architectural presentation.
Fall Protection
Systems and equipment (guardrails, harnesses, nets) used to prevent worker falls from elevated surfaces.
Final Completion
The point at which all contract work, including punch list items, has been fully completed.
Final Inspection
The last code inspection confirming a project meets all applicable requirements before occupancy is granted.
Fine Grading
Final, precise grading performed close to construction of hardscape and landscape features.
Fire Alarm System
A system of detection devices, notification devices, and control panels that alerts occupants to fire conditions.
Fire Damper
A device installed in ductwork that automatically closes to prevent fire from spreading through the HVAC system.
Fire Extinguisher
A portable device used to extinguish small fires, required at specified intervals throughout a commercial building.
Fire Pump
Equipment that boosts water pressure to meet the demand of a building's fire protection system.
Fire Rating
A tested classification indicating how long a wall, floor, or door assembly can resist fire exposure.
Fire Sprinkler System
An automatic fire suppression system that discharges water when heat from a fire is detected.
Fire Watch
A temporary safety measure involving continuous monitoring for fire hazards when a fire protection system is impaired.
Fire-Rated Assembly
A wall, floor, ceiling, or door assembly tested and certified to resist fire for a specified duration.
Firestopping
Fire-resistant material used to seal openings in fire-rated assemblies where pipes, cables, or ducts pass through.
Fixture Unit
A standardized value used to calculate plumbing system sizing based on the number and type of fixtures served.
Flashing
Thin, weather-resistant material installed at joints and transitions to direct water away from a building.
Flex Space
A commercial building type combining office and light industrial/warehouse space within a single structure.
Float (Slack)
The amount of time an activity can be delayed without affecting the overall project completion date.
Floor Covering
The finished surface material applied over a structural floor, such as carpet, tile, or vinyl.
Floor Plan
A drawing showing the layout of a building's interior spaces at a given level.
Footing
A widened base of a foundation wall or column that distributes structural load into the soil.
Force Majeure
A contract clause addressing extraordinary events (natural disasters, labor strikes) that excuse performance delays beyond a party's control.
Foreman
A trade-level supervisor responsible for directing a specific crew's daily work.
Foundation
The lowest structural element of a building that transfers building loads into the ground.
Freestanding Building
A single-tenant building not physically attached to other structures.
G
General Contracting
A method where the owner contracts directly with a general contractor who is responsible for means, methods, and subcontractor coordination.
General Contractor (GC)
The primary contractor responsible for overall construction, coordinating subcontractors, scheduling, and quality control.
General Liability Insurance
Insurance coverage protecting against claims of bodily injury or property damage arising from construction operations.
Generator
Equipment that produces backup electrical power during a utility outage.
Generator (Temporary Power)
Portable equipment used to supply electricity to a jobsite before permanent utility power is available.
Geotechnical Report (Soils Report)
A study of subsurface soil conditions used to guide foundation design and site preparation.
Glass (Glazing)
Transparent or translucent material used in windows, storefronts, and curtain wall systems.
Grab Bar
A mounted bar installed near a toilet or shower to provide support for people with limited mobility.
Grading
Shaping the land's surface to establish proper drainage and building pad elevations.
Gray Shell (Cold Shell)
The most basic base building condition, typically without interior partitions, finished floors, or operating HVAC distribution.
Grease Duct
A specially rated exhaust duct required for commercial kitchen hood systems to safely vent grease-laden air.
Grease Trap (Grease Interceptor)
A plumbing device that captures fats, oils, and grease from kitchen wastewater before it enters the sewer system.
Ground-Up Construction
Construction of an entirely new building on a site, as opposed to renovation of an existing structure.
Guaranteed Maximum Price (GMP)
A contract price ceiling above which the contractor absorbs cost overruns, with savings often shared with the owner.
Gypsum Board (Drywall)
A panel product used for interior wall and ceiling finishes.
H
Hard Costs
Direct construction costs, including labor and materials, as opposed to soft costs.
Hardscape
Non-living, constructed site elements such as walkways, patios, and retaining walls, as distinguished from landscaping.
Heat Detector
A device that senses a rise in temperature and triggers a fire alarm system.
HVAC (Heating, Ventilation, and Air Conditioning)
The complete system responsible for conditioning and circulating air within a building.
I
Impact Fee
A one-time fee charged by a municipality to offset the cost of infrastructure impact caused by new development.
Incident Report
Documentation completed following a jobsite injury, near-miss, or safety incident.
Indemnification
A contractual provision requiring one party to compensate another for certain losses or claims.
Inspector
A representative (municipal, third-party, or owner's) who verifies that completed work meets code and design requirements.
Insulation
Material installed within building assemblies to reduce heat transfer and improve energy performance.
Insulation (Batt, Rigid, Spray Foam)
Materials installed in wall, roof, and floor assemblies to reduce heat transfer.
Integrated Project Delivery (IPD)
A collaborative delivery method where owner, designer, and contractor share risk and reward under one multi-party agreement.
Interior Signage
Wayfinding and identification signage required within a completed commercial interior.
International Building Code (IBC)
The model building code most widely adopted across U.S. jurisdictions for commercial construction.
K
Kitchen Hood (Exhaust Hood)
Equipment installed above commercial cooking equipment to capture and remove heat, grease, and smoke.
L
Landlord
The property owner leasing space to a tenant, sometimes responsible for a base building or "shell" condition.
Landscaping
Plantings and vegetation installed as part of a site's finished condition, often required by zoning or site plan approval.
Lateral Load System
The structural system (shear walls, braced frames, moment frames) designed to resist horizontal forces such as wind and seismic loads.
Lavatory
The plumbing code term for a sink used for handwashing.
LEED (Leadership in Energy and Environmental Design)
A widely used third-party green building certification program.
Lien Waiver
A document signed by a contractor or supplier waiving their right to file a mechanic's lien in exchange for payment.
Light Commercial Construction
Construction of small to mid-sized commercial buildings such as retail stores, offices, and restaurants, as distinguished from heavy industrial or high-rise commercial construction.
Lighting Control System
Equipment and controls (dimmers, occupancy sensors, timers) used to manage building lighting for efficiency and code compliance.
Line of Credit
A flexible financing arrangement sometimes used to fund construction draws.
Liquidated Damages
A predetermined amount specified in a contract as compensation for delay, agreed upon in advance rather than calculated after the fact.
Load-Bearing Wall
A wall that carries structural weight from the building above down to the foundation.
Lockout/Tagout (LOTO)
A safety procedure ensuring equipment is properly shut off and cannot be restarted during maintenance or repair.
Long-Lead Item
Equipment or materials with an extended procurement or fabrication timeline that must be ordered early to avoid delaying the schedule.
Look-Ahead Schedule
A short-term schedule (typically two to three weeks) detailing near-term construction activities.
Louver
A ventilation opening with angled slats that allows airflow while blocking rain and debris.
Low-Flow Fixture
A plumbing fixture designed to reduce water consumption while maintaining function.
Low-Voltage Systems
Building systems (data, security, fire alarm, audio-visual) operating below standard building power voltage.
Lump Sum Contract
A fixed total contract price for a defined scope of work.
Luxury Vinyl Tile (LVT)
A durable, resilient flooring product commonly used in commercial interiors.
M
Make-Up Air Unit (MAU)
Equipment that introduces conditioned outside air to replace air exhausted from a building, commonly required in kitchens.
Means of Egress
The complete, continuous path a person travels from any point in a building to a public way in an emergency.
Mechanic's Lien
A legal claim filed against a property by a contractor, subcontractor, or supplier who has not been paid for work or materials provided.
Membrane Roofing (TPO, EPDM, PVC)
Single-ply synthetic materials used as waterproofing layers on low-slope commercial roofs.
MEP Engineer
An engineer (or engineering team) responsible for mechanical, electrical, and plumbing system design.
Metal Building System (Pre-Engineered Metal Building)
A prefabricated structural steel building system commonly used for warehouses, light industrial, and some retail buildings.
Metal Panel System
A prefinished metal exterior wall or roof cladding system.
Metal Stud Framing
Light-gauge steel framing used for interior partition walls in commercial construction.
Milestone
A significant point or event in a project schedule marking the completion of a key phase.
Millwork
Custom-fabricated wood finish work such as cabinetry, trim, and casework.
Mixed-Use Building
A building combining more than one type of use, such as retail on the ground floor with office or residential space above.
Mobilization
The process of moving equipment, materials, and personnel to a jobsite to begin construction.
Multi-Tenant Building
A building housing more than one tenant, each typically leasing a defined portion of the space.
N
Negotiated Contract
A contract awarded without competitive bidding, typically based on an established relationship or qualifications.
Notice to Proceed (NTP)
A formal written authorization directing the contractor to begin work.
O
Occupancy Classification
The code-based category assigned to a building based on its intended use (business, mercantile, assembly, etc.), which determines applicable requirements.
Occupancy Sensor
A device that automatically controls lighting or HVAC based on detected room occupancy.
Occupant Load
The maximum number of people a space is designed and permitted to safely accommodate, used to determine egress requirements.
Operations and Maintenance (O&M) Manuals
Documentation provided to the owner detailing how to operate and maintain installed building systems and equipment.
OSHA (Occupational Safety and Health Administration)
The federal agency responsible for setting and enforcing workplace safety standards, including on construction sites.
Owner
The individual or entity that commissions and ultimately owns the completed project.
Owner's Contingency
A budget reserve held by the owner, separate from the contractor's contingency, to cover owner-directed changes.
Owner's Representative
A person or firm hired to oversee a project on the owner's behalf, managing communication between owner, designer, and contractor.
