DIY Easy Craftsman Window Trim

DIY Easy Craftsman Window Trim Tutorial @Remodelaholic

Hi, friends!  It's Lauren from Bless'er House, and I'm thrilled to be back sharing more DIY goodness from our latest house shenanigans.

If you've never visited my little corner of the web, my husband and I are on a mission to bring lots of character and charm to our very basic builder box house.

This time two years ago, our living room looked like this:


Since embarking on our homeowning journey, we've discovered that the top three ways to transform a space in a huge way is with paint, long curtains, and architectural details.

DIY Easy Craftsman Window Trim

We already tackled the paint and curtains part last year, and when we threw our DIY faux fireplace into the mix, the space suddenly looked 10 times bigger!  But one thing it was missing in the character department- window trim.

So we decided it was time to fix that.

DIY Easy Craftsman Trim (6 of 22)

By the way, Pandora radio is a must-have in any DIY project at our house.  Turn on some 80s jams, make it a date, and get to sprucing up the place.

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Aside from your tunes, here's what you'll need.

DIY tutorial for installing the easiest DIY window trim. This craftsman style trim requires NO confusing angled cuts, so it's easy for anyone to do, even a beginner @Remodelaholic

Simple DIY Craftsman Window Trim

Can't see the video? Get it on our YouTube channel here (and subscribe while you're there 😉

Supplies list:

(The below supplies are what you'll need for one standard 35.5″ x 59.5″ window.)

  • 1″x2″x8′ board
  • 2- 1″x4″x8′ boards
  • 1″×6″x8′ board
  • 2-in brad nails
  • Wood screws
  • Combination square tool
  • Pencil
  • Hammer or nail gun
  • Drill
  • White trim caulk
  • Wood filler
  • Fine grit sandpaper
  • Paint (I used Sherwin Williams Pure White to match our fireplace and baseboards.)
  • Jigsaw
  • Circular saw or table saw

We had five windows to add trim to, so we had quite a bit more wood than what is in that list.  The best part though is this requires very elementary carpentry skills, so this is an excellent project if you're a beginner at home improvement.  No complicated angled cuts!

The Steps:

1 – We started out by building the header first and measured the top width of our window then added 10 inches to that measurement to allow for a 5 inch overhang on each side of the window.

We marked that measurement on a 1″x6″ board using the square tool to mark a straight line.

DIY Easy Craftsman Trim (1 of 22)

Then, using our circular saw, we cut the 1″x6″ board.

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We used the same measurement from our 1″x6″ to mark and cut two pieces of 1″x2″ boards.  Since we had three windows clustered together to make one large window, we worked from a 12 foot length board.

Once the 1″x2″s were cut, we attached them to each side of the 1″x6″ board with wood screws (as shown below).

DIY Easy Craftsman Trim (3 of 22)

Our header had to be very long for our large window, and since we couldn't find 1″x2″x12′ boards, we had to cut and attach our 1″x2″s in 6 pieces to the longer 1″x6″x12′ board.

DIY Easy Craftsman Trim (4 of 22)

Then we had our header!

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Once we centered our new header over the windows, we nailed them into place.  We used a good ol' fashioned hammer since the size of our nails wouldn't work in our nail gun.

DIY Easy Craftsman Trim (8 of 22)

Lookin' better already, right?

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2 – Next section was the window sill.  We worked on this larger window in thirds too.  Your entire window sill should be the same length as your header was.

We marked the width we needed for the sill on another 1″x6″ board and cut using our circular saw.

Then, using the newly cut 1″x6 “board, we marked on the wall where the sill should end (5 inch overhang) and held up the board to mark the window's edge.

DIY Easy Craftsman Trim (10 of 22)

We measured the window's depth too.

DIY Easy Craftsman Trim (11 of 22)

We marked those two measurements (the window's width and depth) on the 1″x6″ board.

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Using our square tool again, we marked the straight lines between the measurements.

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DIY Easy Craftsman Trim (17 of 22)

Then cut it out with a jigsaw.

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After our cuts, here's what our 1″x6″ board looked like.

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We fit our newly cut 1″x6″ board into place and nailed it in to form our window sill.

DIY Easy Craftsman Trim (19 of 22)

3 – To make the sides of the window, we used 1″x4″ boards.

We just measured the height between the bottom of the header (from step 1) and the top of the sill (from step 2) to know at what length to cut the 1″x4″ board.

In working with our large window, the two sections in the middle of our three windows were a little wider than a 1″x4″ board at 4.74″.  So we had to cut two 1″x6″ boards lengthwise to make them the exact width we needed.

We lined the sides up on the edge of the windows and nailed them into place.

DIY Easy Craftsman Trim (20 of 22)

4 –  For the last carpentry step, we added our apron (the wood piece underneath the window sill).

We measured the width from the outside edge of the 1″x4″ side piece to the other outside edge of the 1″x4″ side piece to find how long to cut the 1″x4″ board for the apron.

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If you're a visual person, this might help to show you how we built the trim for our larger window.

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5 – Then caulk like crazy!  Also known as a carpenter's best friend.

Read tips for a perfect caulking job here and more tips (including a video) here. 

Caulk all of the seams and fill the nail holes and knots with wood filler.  Let dry and sand until smooth.

DIY Easy Craftsman Trim (2 of 2)

6 –  Finally, paint all of your new trim.  We did two coats of primer+paint in one.

Craftsman Window Molding (6 of 1)

We took advantage of the situation by tricking out…er…trimming out our dining room window too.

DIY Easy Craftsman Trim (3 of 1)

After we put our curtains back up, I was amazed at the difference it made!  It's like our windows were destined for Craftsman trim all along.

DIY Easy Craftsman Trim (4 of 7)

Our windows look beautiful with our fireplace too.  Very soon, we'll be putting an area rug in here to make this space finished.  And I hope to put beams on our ceiling eventually, but I might be pushing my luck there.

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As you can tell our dog, snoozing on the back of our loveseat there, is very impressed.

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You can see more sources and DIYs from this room over on Bless'er House.

DIY Easy Craftsman Trim (3 of 7)

What do you think?  Something you might attempt?  Trimming out windows really is a big room changer.  I can't wait to tackle the rest of our upstairs windows with it.




More tips and ideas for DIY window trim jobs:

Start Caulking! Tips and Tricks

caulk like magic

How to Add Trim to Arched Windows
trim molding on arched windows, The Rozy Home featured on Remodelaholic

More top tricks and tutorials for trimming windows:
The Best Tutorials and Resource to Help You Trim Your Windows via Remodelaholic

plus more tips and tricks for installing trim and molding:

Few things can update a home like wainscoting. This beginner's guide for installing trim is so informative, including tool recommendations

Remodelaholic is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Please see our full disclosure here.

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Thanks, Gina! It makes a WORLD of difference! We’ve finished 10 windows and have 4 left until they’re all done in our house. After you get the hang of it, you can knock out one window in about an hour. 🙂

We got it at Lowe’s a couple years ago for about $180 when they went on sale during the summer. It’s called Twin Breeze by Harbor Breeze. Hope that helps! 🙂

Because of this informative and easy tutorial, my husband requested a new table saw! Since I’m requesting this trim on our windows, I gave the green light. It’s a win, win! Thank you for making it a simple decision😊

I already have a window sill, but no trim. I love this look. Any tips on how to go about this? I think I would need to remove the current window sill because it doesn’t stick out as far on the sides. Is it difficult to remove?

Hello!! Where did you get those curtains?? I’m looking for something similar for my living room makeover!!

Thanks for the perfect tutorial. All the pictures and explanations are so thorough. Although I like your curtains, it is almost a shame to cover it all up. We will definitely use this process as we work on our windows in our home remodel. It is something that we can successfully do. All the best…

Just curious, but why did you not use MDF? Probably more labor in ripping the sheet but the finish is a lot easier, and the router works a little better with the MDF. (although you certainly could route the boards you used)

We just started our first window with this trim. We put wood filler over all our nail holes and it’s looking great, but how did you hide the wood screws?

When do g the window trim, would it work to paint once assembled I stead of installing then painting? I just don’t want to have to take and paint carefully

Hello, I am planning on framing out the window in our master bath. I liked how you still kept the blinds. We have blinds, but at the top they aren’t that pretty. Did you do anything to yours? Was thinking about putting the top piece of wood over it to hide them, but don’t think that would look good.