A Piano String Broke — What Now?

First: nobody did anything wrong, the piano is not failing, and this is not an emergency. A broken string is the piano equivalent of a popped guitar string that took fifty years to happen — a routine repair, not a diagnosis. You can even keep playing in the meantime; most notes have two or three strings, so the note will sound thinner but usually still sounds.

Here's what to do today, what the fix involves, and the one situation where a broken string is telling you something.

What to do right now

Don't pull the wire out. If the broken string is drooping or curling where fingers (or cat paws) can reach, coil it gently out of the way, or tuck it aside without forcing anything. The remaining coil stays useful to the technician — it identifies the exact gauge, and for bass strings it may travel to the string maker as the pattern for a custom replacement. Piano wire ends are sharp; handle it like a rose stem, and this is one tidy-up job to keep away from helpful children.

Note which note it is (count up from the left, or just leave the wire visible) and whether anything else happened at the same time — a buzz, a clunk, another note gone odd.

Then book at your convenience, not in a panic. A single broken string changes nothing else about the instrument.

Why strings break

A piano string is steel wire under roughly 70–90 kg of tension, and it holds that tension for decades. Strings break for a handful of unmysterious reasons:

Age and metal fatigue. The most common cause by far. Fifty or eighty years of tension, seasonal humidity cycling, and vibration eventually finds the weakest point — often at the tuning pin or a bearing point, where the wire bends.

Rust and corrosion. Damp storage pits the wire's surface, and pits concentrate stress. Pianos with a basement or cottage past break strings more often, and the string usually shows its rust plainly.

A hard life at the hammer line. Decades of fortissimo on the same note work-hardens the wire where the hammer strikes.

During a pitch raise — occasionally, and predictably. Pulling a long-neglected piano up to pitch adds real tension to elderly wire, and sometimes a string that was going to fail soon anyway chooses that moment. A technician will warn you of the risk on a very flat old piano before starting; it's an accepted part of rescuing a neglected instrument, not a mishap.

The repair, honestly described

Plain steel strings (the middle and treble) are replaced from wire stock, matched to gauge. The replacement itself is quick; if we have the piano's context in advance (which note, roughly what piano), it's very often a same-visit fix alongside a tuning.

Bass strings are bespoke. Each copper-wound bass string is made for its exact position on its exact model, so a broken one is typically measured (or its remains sent) and custom-wound by a string maker — a couple of weeks' turnaround, then a short visit to install. The piano is entirely playable while you wait.

The honest footnote every new string carries: fresh wire stretches. The new string will drift flat faster than its neighbours for a few months and may want a touch-up tune before it fully settles. That's the metallurgy, not the workmanship.

Cost-wise: a single plain-wire replacement during a service visit is modest money; a custom bass string adds the maker's charge. As with all our repair work — assessed and quoted plainly before anything happens, and if we're already there for a tuning, you're only paying the difference.

When one string is a message

One broken string in an old piano: life. A pattern of breakage — several strings in a year, especially with visible rust across the strings — is the piano telling you about its environment or its era of wire, and it's worth an honest conversation about whether re-stringing makes sense or whether the instrument has earned retirement. We'll tell you which, plainly; get in touch and describe what's happened.

Common questions

Can I play a piano with a broken string?
Yes. Most notes have multiple strings, so playing continues — the affected note just sounds thinner. Playing causes no further harm while you wait for the repair.

How much does replacing a piano string cost?
A plain treble/middle string is a modest add-on to a service or tuning visit; a bass string costs more because each is custom-made. You'll have the exact price before any work starts — see our pricing for visit rates.

Why did my string break during tuning?
Raising a very flat, elderly string to pitch adds tension that occasionally finishes what fatigue started. It's a known, warned-about risk on long-neglected pianos — and it's still the right thing to do for the instrument.