How to Measure Windows and Doors

Choose the guide that matches your installation: pocket or retrofit, full-frame brickmould, block frame, or jamb depth. Each guide explains where to place the tape, how to check the opening, and what dimensions to record before ordering.

How to Measure for an Entry Door

A great fit starts with knowing where to put the tape. Follow this guide for a single door, double door, or an entrance with sidelites and a transom.

Pocket / Retrofit Replacement

A pocket — or retrofit — replacement fits your new window inside the existing frame. Your interior trim, exterior finish, and siding stay untouched, so it's the fastest, least invasive way to replace a window that still has a solid, square frame.

Brickmould Replacement

A brickmould replacement removes the old window right back to the brick, and the new unit arrives with brickmould already attached — it fills the masonry opening in one piece. It's the standard full-frame replacement for brick and stone homes.

Block Frame (Straight-Through) Replacement

A block frame window has no nailing fin and no attached brickmould — a clean square frame that slides straight through the opening. It's the full tear-out option: everything comes out back to the rough or masonry opening, and trim is finished after the install.

Jamb Depth

Jamb depth describes the front-to-back depth of a window or door frame through the wall. For an order, distinguish the measured wall depth, the product frame depth and any extension jamb. Record the actual opening and the measuring points, then confirm how the selected frame and mounting accessory will meet the finished interior wall.

Turn your opening list into a window budget

Keep rough openings and manufactured frame dimensions clearly identified. The project estimators use frame sizes; your installer must confirm final order dimensions.

Replacing existing windows

Start with an itemized 10-, 15- or 20-window mix. Adjust the types, available frame sizes, quantities, finish and flange to plan your product subtotal.

Estimate a replacement-window project

Custom dimensions and options

The examples are starting configurations. Use the designer for other supported sizes, glass and accessories; freight, tax and installation are separate.

Review factory-direct ordering and prices