You guys!  Today’s project is easily one of our favorite before and after’s to date!  We recently drove to our sister’s house in Houston to crash it and give it a little shanty makeover.  We have already shared so many of the other projects with you, and today we are showing you how we gave her dining room window a serious update!  Many of you may have half circle windows.  They can not only be difficult to keep sunlight and heat out of, but they also tend to lock the room they are in into a certain look and era. There are shades out there to install such as sunburst shades or a cellular shade but we love the look of casement windows and thought we could change the look of her dining room with a quick DIY update!  We decided to take care of that with a little trim… Well, actually it was a whole lot of trim!  Just click the Play Button below to watch!

Before you all ask, from the outside of the house, the top window now looks white.  You can definitely add something to the back of these boards before attaching if you want a different look, but we love the simplicity of the white!

Now, each half moon window in every home is going to be a different type of window.  We will show you how we achieved the look with her arch windows setup, but you will likely have to modify it a bit to work with yours.  The very first thing we did was remove the existing window stool and replace it with new boards that were flush with the edge of the wall.  We used our table saws to get them the exact width we needed.  We are using primed white pine boards for the whole thing.

Adding Trim to a Window and Hiding a Half Circle

We attached the new stool pieces using wood glue and 2″ nails with our Ryobi 16G Finish Nailer.

Adding Trim to a Window and Hiding a Half Circle

Next, we created the “L” piece, or apron that runs under the window.  This is a 1×4 piece with a 1×2 piece that we attached to one end.  To get the measurement of the 1×4 piece, we measured the very end and inside of each side window to get the overall width of the whole window.  Then we added 7″ to that number since we are going to be adding a 1×4 going vertically on each end in a later step.  So, measure this number and then add 7″.

Adding Trim to a Window and Hiding a Half Circle

The 1×2 piece will be 1.5″ longer on each end and stick off evenly.  We attached those together using wood glue and 1.25″ brad nails with our Ryobi 18G brad nailer.  Once those were attached together, we placed in flush with the new stool piece and attached it to the wall using the finish nailer with 2″ nails again.  The apron will sit evenly under the window.

Adding Trim to a Window and Hiding a Half Circle

Next, we moved up top!  This is a step that some of you may not need depending on your setup.  Our half circle window was joined to our lower windows, so we needed to create a head jamb for the top of the window to separate the two.  We first measured this spot…

Adding Trim to a Window and Hiding a Half Circle

Then, we cut a board to fit that space…

Adding Trim to a Window and Hiding a Half Circle

To attach it, we added 3/4″ pocket holes using our Kreg Jig to the top of this board where nobody will ever see the holes.  Then, we attached it to the wall on each side using 1.25″ pocket hole screws.

Adding Trim to a Window and Hiding a Half Circle

We worked our way up from that point.  We used a 1×10 board and a 1×2 board to create the first piece for the header of this window trim.  We cut the 1×10 the same length as the 1×4 we used to create the apron, and we again made the 1×2 board 1.5″ longer on each side.  We attached the 1×2 to the 1×10 using wood glue and brad nails, and then set the bottom of it flush with the inside top of the windows and attached it to the wall using 2″ Spaz screws into the wall studs.

Adding Trim to a Window and Hiding a Half Circle

Adding Trim to a Window and Hiding a Half Circle

We built the rest of the header next.  This is a 1×8 board, cut the same length as the apron with a 1×2 board attached to each end.  The 1×2 boards are the same measurement as the previous 1×2 boards.

Adding Trim to a Window and Hiding a Half Circle

We attached them using wood glue and brad nails, and then attached the entire piece to the wall using 2″ Spax screws.

Adding Trim to a Window and Hiding a Half Circle

From there, we moved on to our vertical trim pieces.  The outside two boards are 1×4.  We grabbed this measurement and cut them to size.

Adding Trim to a Window and Hiding a Half Circle

We attached them using 2″ finish nails.

Adding Trim to a Window and Hiding a Half Circle

For the inside trim pieces, we grabbed this measurement.  We then used a table saw to cut 1×6 boards down to the exact width we needed.  The were the same length as the two outside trim pieces, and we also attached these using 2″ nails.

Adding Trim to a Window and Hiding a Half Circle

That’s it for trim!  Now comes the most important part…. The caulk and wood filler!  My stepdad once told me… Caulk and Paint make a carpenter what he ain’t.  I love it!  It’s so true!  And it really comes into play when working with walls that aren’t totally square and flush.  We filled all of seams with caulk, and filled the nail holes with wood filler.  After that dried, we put our sister to work painting it to match the rest of the room!  Now, let’s look at that before and after again!  Hide your eyes…  Here is the first before!

Adding Trim to a Window and Hiding a Half Circle

Here it is right before we got our hands on it!

Adding Trim to a Window and Hiding a Half Circle

And here she is now… Heck yes! Just removing the blinds added so much natural light to her space! We decided to get rid of the blinds and just use curtains for privacy

Adding Trim to a Window and Hiding a Half Circle

What about that guys?!

And a shot of the whole room….

Adding Trim to a Window and Hiding a Half Circle

Here are links to all the décor purchases we made for this space!

Finish for tabletop click HERE

Paint for base of table click HERE

Rug under table click HERE

Window panels click HERE

Dining Chairs click HERE

Table Runner click HERE

Centerpiece Vase Click HERE

Adding Trim to a Window and Hiding a Half Circle

Ashley and Whitney Blog post signature
Become a VIP Insider
Stay up-to-date on all the new project, free plans and new products available for you!

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *

33 Comments

  1. Beautiful! I have those awful half circle windows also. My problem is, the biggest one is over 2 standard windows, making it 6′ wide and 3′ high. Ugh.

    1. I can’t help but think this would look strange from the outside. Why not just actually remove the window if she doesnt like it and find matching brick for the outside to patch it up?

  2. If your window does not have an existing stool to be replaced do you just ignore that step and paint the window sill when you paint the boards? I feel the texture difference would be too obvious. My house is totally builder grade with plain Jane windows.

  3. I see you folks delete any comments regarding your apparent ignorance/glossing over of obvious condition problems ( i.e.: the existing frame rot/etc. ). – nor address those comments here. Do I assume that you utilize ‘editorial discretion’ & eliminate any observations which put your construction methods into question?

    1. You shouldn’t feel this entitled to their time and effort, especially when they are providing free content and building plans.

  4. Definitely would like to see the view from the outside. I imagine you did something creative to make it look like it was meant to be covered up. There are so many ideas that come to mind.

    1. I did read most of the post and skimmed parts I guess. You do answer the question before we asked. Thank you for your creative posts!

    2. I am curious about this as well. I love the idea of hiding the arch (so outdated) but not sure how it makes the outside look.

  5. You girls ROCK! What great updates for issues in houses that just need updates to be so much better. Your sister is so blessed to have you guys, & so are we!