Having the right words to describe different parts of your windows and doors can be a real time-saver—especially if you’re looking to upgrade or replace them in the near future. Below, we’ve gathered definitions for everything from basic window terms to the parts that go into a variety of exterior and sliding door styles. By knowing the language, you’ll be able to speak confidently with your installer, compare quotes, and make the best decisions for your home.
Contractors often use technical phrases during consultations. Knowing standard window or door terminology eliminates confusion.
Recognizing different components helps you troubleshoot issues or plan more accurately for repairs and replacements.
When you understand the parts of a door or the details of a window’s build, it’s easier to compare brands, materials, and styles.
The supportive structure that surrounds and holds the sash or glass. In many modern designs, vinyl is a common choice for its durability and energy efficiency.
A moveable or fixed panel that encloses the glass. Double-hung windows typically have two sashes, both of which can move up or down.
The glass itself, which can be single, double, or even triple layers. The more layers, the better insulation.
The vertical sides of a window frame. These form the main outline of the window’s shape.
The bottom horizontal component. Often projects outward slightly to help guide water away from the wall.
The decorative or functional border that covers the space between a window frame and the surrounding wall. On exteriors, this may be called brickmold.
A vertical or horizontal divider that connects adjacent window units in one opening.
Looking for the parts of a door? Here are a few fundamental terms:
The main panel itself—often sold without a frame, hardware, or hinges.
The structure into which the slab is fitted. The jamb is the vertical section, while the head jamb is the horizontal top.
The bottom piece that you step over when walking in. Helps seal out drafts and moisture.
The trim around the door, covering the gap between the frame and the wall.
From hinges and knobs to deadbolts and levers, these components keep your door functional and secure.
Horizontal (rails) and vertical (stiles) components of some door designs that frame interior panels or glass inserts.
If you’re picking out details for a new door, it’s helpful to know some extras:
Ask your installer to walk you through each piece during a final inspection.
In many cases, yes. If the frame is in good condition, you can swap out the casing or brickmold to update the style or replace damaged areas.
If you’re planning a renovation or a new build, absolutely. You’ll be more informed and less likely to face misunderstandings.
Whether you’re curious about new sliding doors, energy-efficient windows, or just want to refresh your existing frames, Window World of Joliet is here for you. We offer a wide range of high-quality products, expert installation, and friendly guidance. Our team is happy to answer further questions about specific parts, materials, or finishes.
Reach out today to schedule a free in-home consultation. We’ll help you choose the perfect fit for your style and budget.