Dealing with old pipes during a bathroom overhaul - worth replacing or just patching up?

That’s funny, I actually crawled under my own sinks with a flashlight when I first moved in - old copper pipes everywhere, and half the shutoff valves were stuck. I debated just swapping out the worst bits, but once I started opening walls for the remodel, it felt silly not to do the whole thing. Is it overkill? Maybe, but I kept thinking about what a leak would cost down the line versus just biting the bullet now. Anyone else get nervous about hidden corrosion or is that just me being paranoid?

“once I started opening walls for the remodel, it felt silly not to do the whole thing. Is it overkill?”

I get it - when you’ve already got the walls open, it feels like half measures are just asking for trouble later. I did a similar thing last year and swapped everything out to PEX. Some folks say copper can last forever, but in my place the corrosion was hiding where I’d never have found it until it leaked. Honestly, peace of mind is worth more than patching up old stuff... at least that’s how I justify the extra expense to myself.

Honestly, I don’t think it’s overkill at all. Once you’ve got the walls open, it’s the perfect time to deal with old pipes - otherwise you’re just setting yourself up for a headache down the road. I used to think patching was enough, but after chasing a hidden leak behind new tile, I learned my lesson. If you can swing it in the budget, replacing now saves a lot of hassle (and money) later.

- Totally agree, especially with:

Once you’ve got the walls open, it’s the perfect time to deal with old pipes - otherwise you’re just setting yourself up for a headache down the road.

If you’ve already got the walls open, it’s hard to justify not replacing old pipes - especially galvanized. Even if they look “fine” on the outside, corrosion and buildup inside can be a real problem, and you won’t always see it until you cut them open. I’ve seen plenty of cases where folks wanted to keep original copper or even some old brass lines for the sake of history, but honestly, reliability usually wins out. Water pressure is a big one too; swapping out those old lines for PEX or new copper can make a noticeable difference.

That said, if you’re dealing with something like heavy-walled copper from the 1920s that’s still in great shape (no pitting, no green corrosion), I get the hesitation. There’s a certain charm to keeping original materials where possible. But from a practical standpoint, most people end up happier in the long run when they bite the bullet and update everything while access is easy. It’s just one less thing to worry about down the line... and trust me, patch jobs have a way of coming back to haunt you at 2am on a holiday weekend.

patch jobs have a way of coming back to haunt you at 2am on a holiday weekend.

Couldn’t agree more with this. I’ve tried to “save” old lines before, thinking I was being clever or preserving character, and it always ends up biting me later. If you’ve got the walls open, it’s just smart to do it right the first time - even if it stings a bit now. Long-term peace of mind is worth it.

Honestly, I’ve seen way too many projects where people try to “save” a few bucks by patching up old pipes, only to end up tearing out finished tile a year later. Here’s how I usually look at it:

- If the walls are open, you’re already halfway there - why not just get the peace of mind?
- New plumbing doesn’t add much to the overall cost compared to what you’ll spend fixing water damage down the line.
- From a design perspective, nothing kills the vibe of a beautiful new bathroom faster than a leak or weird water stains.

That said, sometimes older homes have gorgeous original fixtures or unique supply lines that add character. Ever worked on a place where you really wanted to keep something original? Did it work out, or did it turn into a headache? Just curious how others balance that risk vs. reward when you’re knee-deep in demo...

Dealing With Old Pipes During a Bathroom Overhaul - Worth Replacing or Just Patching Up?

You’re spot on about the “false economy” of patching old pipes. I’ve lost count of the times I’ve been called back to fix a leak behind brand new tile because someone wanted to save a couple hundred bucks. Once those walls are open, it’s the perfect time to do it right. The cost of new supply lines or drains is peanuts compared to the headache (and expense) of water damage repairs later.

That said, I get the temptation to keep original stuff, especially in older homes with cool brass or copper lines. I worked on a 1920s bungalow last year where the owner was dead set on keeping the old clawfoot tub and its exposed supply lines. We pressure-tested everything, replaced the shutoffs, and left the visible pipes since they were in good shape. But we swapped out everything hidden in the walls for new copper. That way, the charm stayed, but the risk was way down.

If you’re dealing with something like old galvanized or even early copper that’s showing green corrosion, I’d say don’t mess around - replace it. But if it’s a unique fixture or visible pipe that’s still solid, sometimes it’s worth the extra effort to keep it. Just make sure you’re not leaving yourself (or your client) with a ticking time bomb.

One thing I always tell folks: if you’re already spending the money on tile, fixtures, and labor, don’t skimp on the stuff you can’t see. It’s not glamorous, but it’s what keeps the pretty stuff looking good for years. And yeah, nothing kills the mood faster than a water stain creeping out from under a brand new vanity.

Long story short, I’m all for preserving character where it makes sense, but I’d rather be safe than sorry when it comes to what’s behind the walls.

Couldn’t agree more about not skimping on the hidden stuff. I learned that the hard way in my first house - patched an old copper joint because I thought, “Eh, it’s held up this long.” Six months later, I was ripping out a brand new vanity after a pinhole leak turned into a soggy mess. Lesson learned: if you’ve got the walls open, just do it right. I get the appeal of keeping some of the old charm, but man, water damage has zero nostalgia.

Had a client once who wanted to save a few bucks by leaving the old galvanized pipes in place - looked fine on the outside, but inside they were almost closed up with buildup. Ended up with terrible water pressure and another round of demo a year later. If you’ve got access, it’s just not worth patching over old stuff.

I’ve run into this dilemma a bunch, especially when clients are trying to balance budget with long-term value. It’s wild how pipes can look totally fine until you actually see a cross-section - like, who knew water could even get through that much gunk? I get the urge to save money, but patching over old plumbing always feels like putting a fresh coat of paint on a crumbling wall.

Here’s how I usually approach it when we’re planning a bathroom overhaul:

1. Figure out what’s accessible. If you’re already opening up walls or floors, it’s the perfect time to swap out old pipes. It’s way less hassle (and mess) than having to do it later.
2. Check the age and material. Galvanized pipes, in particular, are notorious for buildup and corrosion. If they’re original to the house, odds are they’re past their prime.
3. Think about future plans. If you’re planning to stay in the house for a while, investing in new plumbing pays off in peace of mind and resale value. If it’s a flip or short-term hold, I get why people hesitate, but even then, bad water pressure or leaks can tank a sale.
4. Budget for surprises. Even with the best planning, you never know what you’ll find once you open things up. I always recommend setting aside a little extra for “just in case” scenarios.

I’m curious - has anyone tried one of those pipe lining solutions instead of full replacement? I’ve heard mixed things, but never actually seen it done in a residential bathroom. Wondering if it’s a decent compromise or just another patch job that’ll come back to haunt you...

Honestly, you nailed it with the “fresh coat of paint on a crumbling wall” analogy. I’ve seen too many folks regret not biting the bullet when everything’s already torn up. It’s tough to spend more upfront, but future-you will thank you. Pipe lining always seemed more like a band-aid than a cure, especially in bathrooms where access is already open. If you’re already in there, might as well do it right.

Pipe lining always seemed more like a band-aid than a cure, especially in bathrooms where access is already open.

Couldn’t agree more - if you’ve got the walls open, it’s the perfect time to swap out those old pipes. I’ve seen folks try to save a few bucks with patch jobs, only to end up tearing everything out again a couple years later. Curious, has anyone here actually had good long-term luck with pipe lining in a bathroom? Or is it always just delaying the inevitable?

I’ve run into this a few times during renovations, and honestly, I lean toward full replacement if the walls are already open. Pipe lining might buy you a little time, but in my experience, it rarely solves underlying issues for the long haul. It’s tempting to save on upfront costs, but ripping things out twice is way more expensive - and frustrating - down the road.