How To Trim a Window Interior in One Day or Less

Americans spent $567 billion on home improvements throughout 2022.

Whether you’re doing a large home improvement job, or just want to give a room a fresh look, trimming a window can be a good choice. While this is something that you may be able to do yourself, you should only do so if you’re confident in your abilities. For the best results, you’ll want to hire a professional contractor.

How To Trim a Window Interior in One Day

In this guide, we’ll explain how to trim a window interior. Keep reading for more.

Remove the Old Trim

Before you can install a new trim, you need to remove the old one. Apply pressure with a utility knife between the molding and the wall. Score through the dry paint around all four sides.

Place a pry bar between the wall and the trim, and gently tap it using a hammer. This will loosen the trim from the wall. Pry the trim off, and repeat this on the other trims.

Mark the Reveal Lines

Mark the revealed lines with a sharp pencil. Use a tape measure and ensure the reveal lines are 1/8 to 1/4 inches from the inside edge of the window.

You can look at the other window frames in your home to see if there are similar details. This can help you ensure things match up throughout your home.

Cut and Install Top Trim

Make a 45-degree cut on one end of a piece of trim. Position it against the upper reference mark, and use a pencil to mark the other end of the term where it meets the reveal line. Make a 45-degree cut at this point so that the trim is the perfect size.

If the size doesn’t quite match up, make incremental cuts to shorten it to the right size. Attach the trim to the jamb using a nail gun. Also Read – 10 Inexpensive Indoor Gardening Ideas

Cut and Install Vertical Trim

Follow the same steps for the vertical trim, cutting it to size, and making adjustments if needed. Apply wood glue before putting it in position, then use nails on the top and side of the trim to join them.

Wipe away any excess glue and fasten the trim in place similarly to the top trim. Do this the same way for both vertical trim pieces.

Cut and Install Bottom Trim

Use the same cutting process for the bottom trim to ensure it’s the right size. Apply wood glue to the cut end and put the trim in place. Wipe off any excess glue and nail it to the vertical trims.

Finish and Prep the Trim

The trim is now installed, and you can prepare it for painting or staining. Once you have your finished windows, you’ll want to think about window treatments. You can find plenty of options at

Knowing How to Trim a Window Interior

So you now know how to trim a window interior, but you need to be careful. If you haven’t done projects like this before, it can be easy to make mistakes. You may be better off hiring a professional contractor to ensure things are done right.

For more articles on home improvements, check out some of our other blog posts.