How tricky is it to make a window bigger?

And yeah, nothing in these old places is square, so shimming takes forever.

- Totally get the “nothing in these old places is square” pain. My 1920s bungalow has taught me that lesson a few times.
- Air sealing is one of those things you only appreciate after a few winters of cold toes.
- Making a window bigger? That’s a whole new level of chaos—dealing with headers, siding, and hoping you don’t find mystery wiring.
- Curious—did anyone here have to mess with moving electrical or plumbing when upsizing a window? That’s the part that always makes me nervous...

Haha, yeah, old houses are wild. I tried to widen a window in my kitchen last year and thought it’d be a quick job... ended up finding some ancient knob-and-tube wiring right where I needed to cut. Didn’t even realize what it was at first—looked like something out of a museum. Had to call in an electrician, which slowed everything way down (and cost more than I planned). Still worth it for the extra light, but man, these surprises keep me on my toes.

Yeah, I know what you mean—old houses are a total mixed bag. You think you’re just dealing with some drywall and studs, then bam, there’s 70-year-old wiring or weird framing that makes zero sense by today’s standards. I ran into knob-and-tube too when I opened up a wall in my dining room. Not fun, especially when you realize you can’t just patch it and move on.

Honestly, making a window bigger is never as simple as it looks on paper. Even if you dodge the electrical stuff, there’s always a risk of running into oddball framing or even hidden plumbing (ask me how I know...). Plus, with older homes, sometimes the headers aren’t up to code and you have to beef them up, which adds more time and money.

Still, I get why people do it—the extra light really does make a difference. Just wish these jobs could ever go as planned... but that’s old houses for you.

Yeah, that’s the thing—what looks straightforward on a YouTube video turns into a total rabbit hole with these older places. I had to open up a wall for an ethernet run and found not just knob-and-tube, but some weird diagonal bracing that made zero sense. Agree on headers too—mine was just a couple 2x4s stacked, definitely not what code calls for now. Worth it for the light, but you’ve gotta budget extra time and cash for surprises.

- Ran into a similar mess when I tried to widen a window in my 1950s ranch.
- Old framing was all over the place—found some random blocking that I’m pretty sure was just someone’s afterthought.
- Header was barely anything, like you said. Had to rebuild it to handle the new span.
- Also, plaster dust gets everywhere. Still finding it months later…
- Worth it for the natural light, but yeah, every “simple” job in these houses seems to uncover something odd.
- Definitely not as easy as those quick online tutorials make it look.

That’s the thing—opening up these old walls is always a gamble. When I did mine, the insulation (if you can call it that) was just wadded-up newspaper. I ended up redoing everything around the new window to actually make it airtight. It’s wild how much energy you lose through those “simple” upgrades if you don’t pay attention to the details. But yeah, plaster dust… it’s relentless.

Honestly, I get what you’re saying about the energy loss if you don’t seal things up right, but I kinda think people overestimate how much of a difference that makes unless your house is already super tight. I mean, I did a similar window job last year and yeah, the insulation was a joke—old magazines, a few mouse nests, and what looked like horsehair? But after I put in the new window, I just used some decent spray foam and called it good. My heating bill barely budged.

Maybe it depends on the climate or how old the house is. I’m in a 1960s ranch and honestly, the drafts come from like a million other places too. Plus, I actually like having a bit of airflow—keeps things from getting musty. Plaster dust though... that stuff finds its way into every sock drawer. No argument there.

I get wanting a bit of airflow—my last place was sealed up tight and it always felt stuffy, so I kind of appreciate the occasional draft in this house. Still, I noticed a bigger difference when I actually tracked down all the weird little leaks around outlets and baseboards, not just the windows. The new window looked great but didn’t do much for the bill until I went after those other spots. Guess it’s all cumulative. And yeah, plaster dust is wild... no matter how careful I am, it ends up everywhere.

I totally get what you mean about the leaks—tracking down all those little gaps made a way bigger difference than I expected.

The new window looked great but didn’t do much for the bill until I went after those other spots.

As for making a window bigger, I’m actually in the middle of figuring this out myself. Here’s what I’ve learned so far:

1. You need to check if the wall is load-bearing. That’s apparently a pretty big deal—if it is, you’ll probably have to add a new header (which supports the weight above the window). That part kind of scares me, to be honest.
2. After that, you have to cut through drywall or plaster (and yeah, the dust is unreal), then saw through studs underneath the window to make the opening taller or wider.
3. Framing out the new rough opening comes next, then flashing and waterproofing.
4. Once the new window’s in, there’s patching up siding or brick outside, plus drywall and trim inside.

It sounds doable but also like it could get complicated fast—especially with old houses where nothing’s quite square. Anyone else find weird surprises behind their walls?

Yeah, the “nothing’s quite square” struggle is real. When I opened up a wall to make room for a bigger kitchen window, I found an old wasp nest and what I think was a squirrel skeleton… fun times. And trying to get new framing to line up in my 1950s house felt like playing Jenga with crooked blocks.

That part kind of scares me, to be honest.

Same. I watched so many YouTube videos on headers I started dreaming about them. If you’re not 100% sure about the load-bearing thing, definitely worth getting a pro to peek at it. Otherwise, dust and chaos are pretty much guaranteed.