Bumping out always seemed easier to me, but I learned the hard way that nothing’s ever straightforward with these old houses. We tried building up once—thought it’d be simpler since we wouldn’t have to mess with the foundation. Ended up fighting with sagging joists and weird ceiling transitions for weeks. At least when you bump out, you can start fresh on a new slab or crawlspace, even if tying into the old framing is a headache. Found an old cistern under our kitchen addition... nearly fell in. Sometimes I think these houses are just testing us.
Funny you mention the cistern—ran into something similar under a 1920s bungalow once, except it was an old coal chute. Nearly twisted my ankle. I get what you’re saying about bumping out being “easier,” but I’ve found it’s a toss-up. With older homes, sometimes the foundation’s so bad that building up actually makes more sense, even with the weird ceiling lines and all. Ever had to deal with matching old siding or brickwork when you bump out? That can be a nightmare in itself...
Matching old siding is brutal—especially when the original stuff’s not even made anymore.
I’ve only just started poking around the idea of a bump-out, but the thought of trying to blend new Hardie with 100-year-old wood makes me nervous. Did you find any tricks for getting the colors/textures close, or did you just accept it’d look a little “patched”? I’m also wondering how much dealing with permits factored into your decision—seems like that can be a whole other headache.Ever had to deal with matching old siding or brickwork when you bump out? That can be a nightmare in itself...
Matching new siding to century-old wood is a real test of patience. I’ve been through it twice now—once with a bump-out and once with a small addition. Honestly, unless you’re willing to hunt down reclaimed materials (which can get expensive and time-consuming), you’ll probably end up with a bit of a patchwork look. That said, there are a few tricks that help minimize the contrast.
First, if you’re using Hardie or any fiber cement, try to get the reveal (the exposed part of each board) as close as possible to your original siding. Even if the texture isn’t a perfect match, having the lines line up goes a long way. For color, I’ve had better luck bringing a chunk of the old siding to a good paint store and having them custom-match it, rather than picking from swatches. The sun does weird things to paint over 100 years, so even “historical” colors can be way off.
Texture’s tougher. Some people go as far as using a wire brush or even a little sandblasting on the new boards to rough them up, but that’s a lot of work for marginal gains. In my case, I just accepted that the new section would look fresher for a while. After a couple years, weathering helps blend things in more than you’d think.
Permits are their own beast. Where I live, bump-outs triggered more scrutiny than building up—something about changing the footprint versus just adding height. The paperwork was tedious, but honestly, the inspection process was more straightforward than I expected. If you’re in a historic district, though, brace yourself for extra hoops.
I wouldn’t let the siding issue scare you off if a bump-out makes sense for your space. Most people don’t notice the differences unless they’re looking for them. And if you ever do want to unify things down the line, you can always re-side the whole wall or add trim details to break up the transition. It’s never going to be invisible, but it doesn’t have to look like an afterthought either.
- Matching siding really is a pain, especially if you’re sticking to a budget. I’ve found that even the best paint match can look off in certain light, but I agree—lining up the reveals is key.
- When I looked into bumping out vs. building up, the costs were all over the place. Bump-outs meant pouring a new foundation or at least footings, while building up meant beefing up the old structure to handle extra load. For my 1920s place, framing costs for going up were higher, but foundation work for a bump-out added up too.
- Permits in my town were actually easier for a second story addition—less zoning hassle since the footprint didn’t change. But I know that’s not universal.
- One thing I ran into: utilities. Moving plumbing or electric for a bump-out got pricey fast. Did you have to reroute anything major with your addition, or did you get lucky?
- Curious if anyone’s tried using engineered wood siding as a compromise? It’s cheaper than fiber cement and can get pretty close on texture if you’re not right up on it...
