How to tell if free plumbing fixtures are safe or legal to reinstall
Free sinks, faucets, and toilets show up in curb alerts and renovation cleanouts fairly often, and they're a genuinely useful category to grab if the fixture checks out. But plumbing fixtures carry two separate questions that other free items don't — whether the piece is actually sound enough to reinstall, and whether reinstalling a used one is even allowed where you live. Worth being upfront: this isn't legal advice, and plumbing code varies by city and county — verify locally before you install anything.
The legal question varies more than you'd expect
Some jurisdictions restrict or outright prohibit reinstalling used toilets and certain fixtures in specific situations — rental properties and code-required renovations are where this comes up most. Other places have no restriction at all for a homeowner reinstalling a used fixture in their own home. There's no single national answer here, and it's not something to guess at: a quick call to your local building or plumbing department, or checking with a licensed plumber before you install anything, is the only way to know for sure what applies where you are.
Toilets: check for hairline cracks first
Toilets are the fixture most worth a careful visual check before you take one home. A hairline crack in the porcelain — even one that looks minor or cosmetic — is a real failure risk, since porcelain cracks tend to spread under the stress of normal use and water pressure, and a cracked tank or bowl can fail suddenly rather than gradually. Look closely at the tank, the bowl, and especially around the bolt holes and the base, ideally in good light, before deciding a toilet is worth taking. If you can see the seller fill and flush it before you commit, that's worth asking for.
Faucets and sinks: corrosion is the main thing to look for
For faucets, check the base and the areas around any visible metal fittings for corrosion, greenish discoloration on brass components, or a chalky white buildup that suggests long-term mineral buildup or a slow leak that was never addressed. A faucet that looks clean and turns smoothly with no resistance or grinding is usually a safe bet. For sinks — porcelain, cast iron, or stainless — check for chips, rust spots (on cast iron especially), and hairline cracks the same way you would with a toilet, since a compromised sink surface only gets worse with use.
Make sure all the mounting hardware and gaskets are included
A perfectly sound fixture missing its mounting hardware, wax ring, supply lines, or gaskets is a much smaller win than it looks like, since exact-match replacement parts for an older fixture aren't always easy to find. Before you commit to hauling something home, ask the poster whether everything that came with the original install is included, and do a quick visual check yourself — a toilet with no wax ring or a faucet with no supply lines means a trip to the hardware store before you can actually use it.
Water supply lines and shutoff valves
If a fixture comes with its old supply lines or shutoff valves attached, it's usually worth replacing these regardless of how the fixture itself looks — supply lines are inexpensive, and old or already-flexed ones are a common source of small leaks down the road. Treat these as consumables you replace on principle rather than something to evaluate for reuse.
When to just buy new instead
If a toilet has any visible crack, if a faucet shows real corrosion rather than just cosmetic wear, or if you're missing hardware you can't easily source, it's often not worth the trouble for something this inexpensive to replace new. Plumbing fixtures are one of the categories where the free price tag can tempt you past the point where a new one would genuinely be the better call.
Ask your local code office before installing, not after
If you're doing anything beyond a like-for-like swap in your own home — especially in a rental, or anything that touches a permitted renovation — check with your local building department before installation, not after. This is squarely a "rules vary by city and county" situation, and it's worth five minutes on the phone to avoid redoing work later.
The bottom line
A free plumbing fixture can be a genuinely good find, but check toilets for hairline cracks, faucets and sinks for corrosion, and confirm all mounting hardware and gaskets are included before you commit. The legal side isn't universal — this isn't legal advice, so verify with your local code office before reinstalling anything, especially in a rental.
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