Installing Trim Around A Plastered Window Well

By Robert Robillard on Finish Carpentry

Simple Window Trim Dresses Up Window Opening:

Recently I was asked what I could do to dress up a basement recessed window that had no trim and waInstalling Trim Around A Plastered Window Wells all plaster walls by installing trim around a plastered window well.  

The designer on the project wanted the window to look like the windows upstairs, which had window trim and a traditional window sill. This was an easy fix I so I suggested we add a half round molding to the plaster opening bottom to simulate a window sill and then install colonial casing  [similar trim to what is on the interior doors in that room] around the window opening.

It’s All in the Reveal

The first step was to mark my reveals around the opening.  I use 3/16″ as my reveal.  Once that was done I measured the width of the two side reveal marks, added the width of my trim multiplied times two and then added for sill nosing over hang of 3/4″ on both sides. 

[ FORMULA:  width between reveal marks + 2x Trim width + 1.5″ for sill overhang] I then used a router to rout a half round on three sides of a 4″ board, then ripped the board down to 1-1/4″ wide.  

Start With the Sill Trim

I applied this nosing to the wall below the window opening with adhesive caulk and finish nails. Installing Trim Around A Plastered Window WellNext I applied trim to the two sides of the opening and then ripped the top trim on the table saw to fit tight to the crown molding.   I finished this project by adding trim under the sill  nosing to form the stool trim.  forty-five degree bevel returns to the walls finish off the trim nicely.  

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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzzr As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising-the-bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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