I'm renovating the bathroom. I used to have 1" thick drywall and I'm lowering it to 1/2" thick drywall (so the window sticks out of the wall 1" now).

What are my options for trimming the window? Inch thick trim seems really thick. Is that normal?

Here are pictures of my attempted explanation... enter image description here enter image description here

1 Answer 1


Your options are:

  1. Use a second layer of 1/2" drywall to bring the wall flush to the window;
  2. Trim the window casing down by 1/2"; or
  3. Use inch thick trim on the window casing.

Personally I recommend #2 and would use what's called a Japanese saw:

enter image description here

or a multi-tool with a wood blade

enter image description here

to trim the casing down to be flush with the wall.

  • The Ryōba has become very popular lately.
    – Tester101
    Aug 8, 2014 at 11:24
  • If I trim the casing, won't the window still stick into the room that far? I actually have a replacement window that fits the current window size (bought it before I realized I would want it to be thinner) Aug 8, 2014 at 15:23
  • Ok perhaps I misunderstood your meaning. Could you post a picture of the window? Aug 8, 2014 at 18:54
  • I've added pics. See my edit :) Aug 10, 2014 at 18:33
  • So I think perhaps we're using different meanings for terms here. The casing I talk about trimming is the wood you're measuring. You would install the drywall, then using the tools I indicated, cut the casing to be flush with the drywall. Aug 12, 2014 at 12:06

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