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The Home Depot

Window Casing Guide

Pro Referral > Home Guides > Door & Window > Window Casing Guide
Window Casing Guide

The molding that surrounds the window and covers the frame is known as window casing. The ones that are found on the outside of the house help seal the window frame to the house thus preventing the cold air from finding or navigating its way inside the house. The casings found in the interior are more for aesthetic purposes than functionality. There is a wide range and variety of window casings to choose form. Your choices will depend on your budget and the décor of your house.

  1. The material that window casing is made of can range from wood to bamboo to press boards and even some types of plastic. You can also choose to have the window casings custom-made if you so desire.

    1.Building Permits

    Before you start working on your ceiling fan ensure that the power supply to it has been disconnected. Do not just switch off the power to the fan; instead switch off the circuit breaker that supplies power to the fan. This step will ensure your safety and protect you from potential electrical shocks.

  2. 2.Costs and Measurements

    The material that window casing is made of can range from wood to bamboo to press boards and even some types of plastic. You can also choose to have the window casings custom-made if you so desire. Installation of window casings is an easy do-it-yourself project for someone with moderate skill in completing home improvement projects. Professional installations can cost anywhere between $1.40 and $3.75 per linear foot and can be done in a day or two. The work must be completed with adequate planning and sharp or just decent attention to detail.

  3. 3.Types of Window Casing

    Complete casings surround all the sides of a window. These can comprise of a single layer of molding or have multiple layers that are stacked up. The multiple, stacked layers can be more decorative and appealing than the single-layered ones. A low profile window casing is one which is placed flat against the siding or the interior walls. This helps insulate the house and keeps it warm even in cold weather. So, if you live in a region which sees and must cope with a long winter, you might like this type of casing for your windows. High profile casings have the widest range of options to offer. Readymade layered looks are available in this style and they can either be all around the windows or just on one side.


    If you like contemporary styles, modern casings may be your cup of tea. These are minimal in design and have clean lines, blending in with the window. The focus is more on glass rather than the moldings. Traditional casings, on the other hand, are more or less similar to the low profile casings. They usually come in simple designs with a decorative or fluted column design accompanying it. Plaster casings are also available but these are usually used only for renovations in historic buildings. The widths of window casings can range from 1.5 inches to 2.5 inches.

  5. 4.Installation

    When installing window casings, precise measurements and cuts will be required. You should remember to measure the same way all through and maintain consistency when cutting. You may need a miter saw for cutting as well as sufficient nails to attach the casing to the window frame. If you place a combination square against the window jamb, you will be able to attain the exact measurements for the edges and corners of the casing. Once the bottom casing is cut for mitered corners, you will have to find out the distance between the two marks on the vertical framing members at the bottom.


    Then you must cut a piece of casing to fit this. You will have to line up the bottom casing within the marks you have previously made and hammer it into place. Follow this process for the rest of the window and nail in the casing as per your measurements. Only the corners will need some special attention. You will have to glue the corner pieces in place. You can use silicone sealant to plug the nail holes and the spots where the pieces join.

  6. 5.Basic Protection

    Remember to wear protective gear such as gloves and safety glasses when doing this work. A dust mask will be needed when you are cutting wood but this is up to you. If using a miter saw, don’t forget to protect your hearing too and this is probably more important than a mask. You may want to wear some glasses too.

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