A plain-English glossary of the words builders, contracts, and courtrooms use, for people who have never picked up a trowel.

From The Law Offices of Colby Lewis, Houston, Texas.

Every trade has its own language, and construction has more of it than most. Walk onto a job site or open a construction contract and you hit a wall of words, soffit, parapet, retainage, change order, substantial completion, that everyone around you treats as obvious. They are what lawyers call terms of art: ordinary-sounding words that carry a specific, settled meaning inside the industry. Miss the meaning and you can misread your own contract, your own house, or your own dispute.

This guide translates that language. Below are more than 79 of the terms you are most likely to run into as a homeowner, a property owner, or anyone dealing with a builder, grouped so they build on each other, from the bones of a structure to the words that show up when a project goes sideways. No jargon in the explanations, no construction background assumed. If a friend who had never seen a blueprint asked you what a ‘parapet’ was, this is how you would answer.

How to read this glossary
The terms are organized in seven groups, roughly the order you would meet them on a real project: the structure, the exterior, what is inside the walls, the people, the money, the paperwork, and finally the words that come up in defects and disputes. You can read it start to finish or jump to the group you need.

The Bones: Structure and Foundation

Foundation. The part of the building below the ground that carries everything above it and transfers that weight into the soil. If the foundation moves, the whole house feels it.

Footing. The wide base at the bottom of the foundation that spreads the building’s weight over more dirt so it does not sink. Think of footings as snowshoes for a house: the wider the base, the less it presses into soft ground.

Slab (slab-on-grade). A flat concrete floor poured directly on the ground, common in warm climates. When people say a house is ‘on a slab,’ this is what they mean, as opposed to having a crawlspace or basement.

Grade / grading. ‘Grade’ is the level of the ground. ‘At grade’ means at ground level. ‘Grading’ is shaping the dirt around a building so water runs away from it instead of toward it. Bad grading is a leading cause of water problems.

Load-bearing wall. A wall that holds up the structure above it. You can remove a non-load-bearing wall fairly freely, but knock out a load-bearing wall without adding support and the floor or roof above can sag or fail.

Beam. A horizontal structural member that carries weight across an open space, such as the header over a garage door or the beam under a floor.

Girder. A large, heavy beam that supports smaller beams. The girder is the muscle; the joists lean on it.

Joist. One of the many parallel horizontal members that hold up a floor or ceiling. When a floor feels bouncy, undersized or over-spanned joists are often the reason.

Rafter. One of the sloped members that frame a traditional roof and give it its pitch.

Truss. A pre-built, triangulated frame (for a roof or floor) engineered in a factory to carry load using less material. You should never cut or modify a truss without an engineer, because every piece is doing a job.

Stud. One of the vertical members, wood or metal, inside a wall. ‘Finding a stud’ matters because that is the solid framing behind the drywall.

Header. The beam placed over a window or door opening that carries the weight around the hole so the opening does not collapse.

Lintel. The same idea as a header, but the term used for the beam spanning an opening in brick or stone.

Column / pier. A vertical support that carries load straight down to the foundation. Columns are the legs the beams and girders stand on.

Dead load and live load. Dead load is the permanent weight of the building itself. Live load is the temporary, movable weight it must also carry: people, furniture, snow on the roof. Buildings are designed for both.

Settlement / differential settlement. Settlement is the building sinking as the soil compresses. A little, evenly, is normal. ‘Differential’ settlement is uneven sinking, and that is what cracks foundations, walls, and tile.

The Skin and Trim: What You See Outside

Facade. The face of a building, usually the front. It is the exterior wall you notice from the street.

Cladding / veneer. The outer skin of a building, such as brick, stone, or panels, attached to the structure behind it. A brick ‘veneer’ often looks structural but is really a weather layer hung on the frame.

Curtain wall. A non-structural outer wall, usually glass and metal, hung on the building’s frame like a curtain. It keeps weather out but holds up none of the building. Most glass towers use curtain walls.

Parapet. The short wall that extends up past the roofline at the edge of a flat roof. It hides rooftop equipment, helps with fire separation, and keeps people from walking off the edge.

Soffit. The finished underside of an overhang, most commonly the underside of the roof eaves where the roof sticks out past the wall. Look up while standing next to a house and the panel above your head is the soffit. It usually has vents that let the attic breathe.

Fascia. The vertical board that runs along the edge of the roof, where the gutters are attached. Soffit is the bottom of the overhang; fascia is the front of it.

Eave. The part of the roof that overhangs the exterior wall. The eave is the overhang; the soffit and fascia are the finished surfaces on it.

Cornice. The decorative, molded projection at the very top of a wall, where the wall meets the roof. Common on older and more ornate buildings.

Flashing. Thin sheets of metal (or other material) installed at the seams of a building, around chimneys, in roof valleys, above windows and doors, to direct water away from the joint. Flashing is the single most important, and most commonly botched, defense against leaks.

Weep hole. Small gaps left in the bottom course of a brick wall on purpose, so any water that gets behind the brick can drain back out instead of rotting the wall. Homeowners sometimes seal them by mistake and trap water inside.

Course. A single horizontal row of bricks, blocks, or stone. Masonry is built one course at a time.

Mullion and muntin. A mullion is the heavier vertical piece that separates two windows or door panels. A muntin is a thin strip that divides the small panes within a single window. Easy to mix up; the mullion is the bigger divider.

Inside the Walls: Framing, Systems, and Layers

Framing. The skeleton of the building, the assembled studs, joists, beams, and rafters, before anything covers it. ‘Framing stage’ is when a house looks like a wooden cage.

Sheathing. The panels (often plywood or OSB) that cover the framing to stiffen it and give siding and roofing something to attach to.

Subfloor. The structural floor layer that sits on the joists, underneath the finished floor you actually walk on.

Rough-in. Installing the hidden guts of the building, the pipes, wires, and ducts, inside the walls and floors before they are closed up with drywall. ‘Passing rough-in inspection’ means the hidden work was approved before it got covered.

MEP. Shorthand for mechanical, electrical, and plumbing, the three core systems that make a building work. When people talk about ‘the MEP,’ they mean the guts.

HVAC. Heating, ventilation, and air conditioning, the system that controls temperature and air in the building. Pronounced ‘H-VAC.’

Vapor barrier. A thin membrane installed to stop moisture from passing through walls, floors, or crawlspaces. Left out or installed on the wrong side, it can cause mold and rot instead of preventing it.

Expansion joint. A deliberate gap built into concrete, masonry, or long runs of material so the material can expand and contract with temperature without cracking. The lines you see cut into a concrete sidewalk are doing this job.

Waterproofing. The systems that keep water out where it is most likely to get in, below ground, on decks, balconies, and flat roofs. Distinct from a vapor barrier, which handles moisture in the air.

Who Is Who on a Construction Project

Owner. The person or company paying for the project and, usually, the one who ends up living with any defects. That may be you.

General contractor (GC, or ‘prime’). The main contractor responsible for delivering the whole project. The GC signs the contract with the owner and hires and manages the subcontractors.

Subcontractor (‘sub’). A specialty contractor hired by the general contractor to do one trade, such as the electrician, plumber, framer, or roofer. Subs usually work for the GC, not directly for you.

Design professional (architect or engineer). The licensed professional who designs the project and produces the plans and specifications. The architect handles the overall design; engineers handle structure, mechanical systems, and the like.

Construction manager. A professional hired to manage a project on the owner’s behalf, coordinating design and construction. On some projects the CM runs the job instead of a traditional general contractor.

Materialman / supplier. A business that supplies materials to the project (lumber, concrete, fixtures) rather than performing labor. The old-fashioned word ‘materialman’ still shows up in lien laws.

Surety. The company that issues bonds guaranteeing a contractor will perform the work and pay its subs. If the contractor fails, the surety can be on the hook. A surety is not an insurer of the owner; it backs the contractor’s promises.

Building inspector / Authority Having Jurisdiction (AHJ). The government official, and the office, that inspects the work and decides whether it meets the Code. ‘AHJ’ is the umbrella term for whoever has the legal authority to approve or reject the work in your area.

The Money Terms: Price and Payment

Code (building code). The set of minimum, legally adopted rules for how a building must be constructed to be safe. ‘Bringing it up to Code’ means meeting those minimum standards. Code is a floor, not a measure of quality; a builder can meet Code and still do mediocre work.

Scope of work. Exactly what the contractor agreed to do, spelled out in the contract and plans. A huge share of construction disputes come down to one question: was that task inside the scope, or an extra?

Change order. A written agreement that changes the original contract after it is signed, adjusting the work, the price, the schedule, or all three. Get every change in a signed change order. ‘The builder said it was fine’ is not a change order, and verbal changes are where disputes are born.

Lump sum (fixed price). One set price for the entire job. The contractor bears the risk if the work costs more than expected, and keeps the difference if it costs less.

Cost-plus. The owner pays the actual cost of the work plus an agreed fee or percentage for the contractor. More transparent, but the final price is open-ended unless it is capped.

Guaranteed maximum price (GMP). A cost-plus arrangement with a ceiling. The owner pays actual costs plus a fee, but not more than the guaranteed maximum. It blends the openness of cost-plus with the protection of a cap.

Allowance. A placeholder dollar amount in the contract for an item not yet chosen, such as a ‘5,000 dollar tile allowance.’ If you pick tile that costs more, you pay the difference. Allowances that are set too low are a classic way a bid looks cheaper than it really is.

Contingency. Money set aside in the budget for the unexpected. It is not a slush fund; it is a realistic cushion for the surprises that almost every project produces.

Schedule of values. A line-item breakdown of the contract price (so much for foundation, so much for framing, and so on). The contractor bills against it as each part gets done.

Progress payment / draw. A periodic payment made as the work advances, rather than all at once. A ‘draw’ is the contractor drawing the next installment, usually after that phase is inspected.

Retainage (retention). A percentage of each payment, often 5 or 10 percent, that the owner holds back until the job is finished, as leverage to make sure the contractor completes the work and fixes the punch list. The contractor gets it at the end.

Liquidated damages. A dollar amount agreed in advance, usually per day, that the contractor must pay if the project finishes late. Because actual delay losses are hard to prove, the parties fix the number up front. It has to be a reasonable estimate, not a penalty.

The Paper Trail: Documents and Milestones

Plans and specifications (‘specs’). The two halves of the design. The plans are the drawings that show what goes where; the specs are the written rules for the materials and the quality of workmanship. Together they define what you are owed.

Blueprint. An older word for the construction drawings, from the blue-tinted copies once used. People still say ‘blueprints’ even though they are now printed in black on white.

Submittal / shop drawings. Detailed drawings, product data, or samples the contractor or a supplier prepares and submits to the designer for approval before fabricating or installing something. It is the checkpoint where the designer confirms the actual product matches the design.

Request for information (RFI). A formal written question from the contractor to the designer asking to clarify or resolve something unclear in the plans. RFIs create a paper trail, and a pile of them can signal that the design was incomplete.

Building permit. The local government’s authorization to do the work. Building without a required permit can mean fines, forced removal, and problems when you sell the home.

Notice to proceed. The owner’s official instruction telling the contractor to start work, which often starts the clock on the project schedule.

Punch list. The list of small, unfinished, or defective items identified near the end of the job that the contractor must complete or fix before the work is fully accepted. The nicks, touch-ups, and ‘that door sticks’ items.

Substantial completion. The milestone when the project is complete enough for the owner to use it for its intended purpose, even if minor punch-list items remain. It is a big legal moment: it often starts the warranty clock, shifts responsibility for the property, and stops most delay damages.

Certificate of occupancy (CO). The government’s written sign-off that a building meets Code and is safe to occupy. You generally cannot legally move in until the CO is issued.

As-built drawings. Drawings updated at the end of the job to show what was actually built, including the changes made along the way. Invaluable later when someone needs to know where a pipe or wire really runs.

Warranty / callback. The contractor’s promise to come back and fix covered defects for a set period after completion. A ‘callback’ is exactly that: calling the contractor back to repair something that failed.

When Things Go Wrong: Defects, Delays, and Claims

Patent defect vs. latent defect. A patent defect is one that a reasonable inspection would reveal, it is out in the open. A latent defect is hidden and does not show up until later, sometimes years later, like a slow leak behind a wall. The difference can affect your legal deadlines.

Differing site conditions (changed conditions). When the actual conditions on site turn out to be materially different from what the contract assumed, for example, hitting rock, water, or bad soil where the plans showed none. It is one of the most common triggers for extra cost and time claims.

Critical path and float. The critical path is the chain of tasks that determines the project’s finish date; delay any of them and the whole project slips. ‘Float’ is the slack in tasks that are not on the critical path. This is the language courts and schedulers use to decide who actually caused a delay.

Backcharge. When one party bills another for the cost of fixing or completing that party’s work, for instance, a general contractor charging a subcontractor for cleaning up the sub’s mess.

Means and methods. The contractor’s own choices about how to carry out the work, the techniques, sequence, and equipment. As a rule, the contractor, not the designer, is responsible for means and methods, and for job-site safety that goes with them.

Value engineering. Substituting less expensive materials or methods to cut cost while trying to keep the same function. Done well, it saves money; done carelessly, ‘value engineering’ is where quality quietly disappears from a project.

Mechanic’s lien (materialman’s lien). A legal claim that an unpaid contractor, subcontractor, or supplier can record against the property itself. It can cloud your title even if you already paid the general contractor, which is why lien waivers matter so much.

Lien waiver. A signed document in which a contractor or supplier gives up its lien rights, usually in exchange for payment. Collecting lien waivers as you pay is how an owner avoids paying twice for the same work.

Payment bond and performance bond. Two guarantees from a surety. A performance bond promises the project will be completed if the contractor defaults. A payment bond promises the subcontractors and suppliers will be paid, which protects the owner from their liens.

Bid bond. A guarantee, submitted with a bid, that the bidder will actually sign the contract at its bid price if selected, rather than walking away.

The Spearin doctrine. A long-standing rule that if the owner provides the plans and specifications, the owner, not the contractor, is responsible when those plans turn out to be defective. In plain terms: if you hand the builder a flawed blueprint and the builder follows it, the resulting problem is generally on you, not the builder.

Why these words matter

Most construction disputes are, at bottom, arguments about language. Was that work inside the scope or an extra? Was the defect patent o latent? Did the job reach substantial completion before the delay damages stopped running? When you know what the words mean, you can read your own contract, ask sharper questions, and spot trouble while it is still cheap to fix.

If a project has already gone wrong
The Law Offices of Colby Lewis handles construction and commercial disputes for owners and homeowners across Texas. If you are staring at a contract you do not fully understand, a defect nobody will take responsibility for, or a lien on your property, you can learn more about our practice o contact our office.

This glossary is general educational information, not legal or construction advice, and does not create an attorney-client relationship. Definitions are written for plain understanding and are not technical or legal standards. For a specific project or dispute, consult a licensed professional. The Law Offices of Colby Lewis, Houston, Texas. Attorney advertising.