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Why We Always Replace Both Springs (Even When Only One Broke)
Published April 15, 2026 by Matthew Knepp · President, Southern Garage Doors, Inc.
The Suspicion Is Reasonable
When a contractor tells you that you need to replace something besides the broken part, you should be suspicious by default. That suspicion is a good instinct and it's kept a lot of homeowners from getting ripped off.
So let's address it head-on: when only one of two garage door springs has broken, and we say both need to be replaced, we're aware of how that sounds. It sounds like every other "while we're in there" upsell anyone has ever heard from a contractor. If you're reading this with your arms crossed, that's fair.
The rest of this post is our side of the argument. We think it holds up under honest inspection. If at the end you still disagree, we'll replace only the broken spring — but we'll put the math we just showed you on the invoice so you can look at it again in six months when the other one fails.
What this means for you: this policy is not a preference. It's the answer cycle physics gives when you ask it the right question. The question is "how much total do I pay over the next 12 months?" — not "how much do I pay today?"
Both Springs Share the Work — So Both Springs Share the Wear
A double-spring door has two torsion springs working together as a single system. They're wound in opposite directions (so the forces cancel on the shaft) but they're doing the same job: storing energy when the door is down, releasing it when the door comes up.
On every open/close cycle, both springs bend the same amount. They're mechanically linked — rigid drums on a shared shaft. Neither spring can do "half the work" while the other rests. Whatever fatigue damage the broken spring absorbed over its life, the other spring absorbed in the same amount, across the same number of cycles.
If you haven't read the earlier post on cycle life, the one-paragraph version: garage door springs have a published cycle budget — typically 10,000 cycles for standard springs. Every open-and-close uses one cycle. Once the budget runs out, the metal snaps, abruptly, without warning.
Both springs on a double-spring door were installed on the same day, from the same coil stock, tied to the same door, operated on the same schedule. They started with identical cycle budgets. They've drawn down those budgets identically. When one breaks, the other is — not "might be" — at the same point in its fatigue curve.
What this means for you: when one spring snaps on a double-spring door, the second spring is not a fresh spring that happens to still be working. It's an end-of-life spring that happens not to have snapped yet. The difference matters.
The Math on 'Just Replace the Broken One'
Here's what it actually costs to save money by only replacing the broken spring — assuming the other one is within 3–6 months of the same fate, which is the overwhelming pattern we see on the trucks.
Option A — Replace both springs today: Double-spring replacement = $599. Includes service call, 17-point inspection, both springs custom-cut to door weight, 1-year parts warranty. Total cost over the next 12 months: $599.
Option B — Replace only the broken spring today, the other when it fails: Single-spring replacement (standalone) = $449 today. Then in 2-6 months, the other spring fails. Second visit: Single-spring replacement = $449. Total cost over the next 12 months: $898.
Option B costs $299 more than Option A — 50% more — and you spend part of that time with an out-of-service door waiting for the second appointment. The "save money" option doesn't save money; it just splits one expensive day into two more expensive days.
We'd be happy to charge you $898 across two visits if the math actually worked for you. It doesn't. That's the whole reason our policy is what it is.
What this means for you: this is the most common "you're trying to upsell me" moment in the residential garage door business. And in this one specific case, the upsell accusation is mathematically backwards. The upsell would be letting you pay $898 instead of $599.
'But the Second Spring Looks Fine'
Sometimes homeowners ask the technician to inspect the second spring and confirm it's fine before replacing it. That's a fair thing to ask. But here's what a visual inspection of a spring actually tells us:
It tells us the spring hasn't broken yet. That's the only thing a visual inspection can confirm.
It cannot tell us how much cycle life remains. The fatigue damage — the accumulating microscopic cracking inside the steel — is invisible from the outside. A spring at cycle 9,999 of a 10,000 cycle budget looks identical to a spring at cycle 1. The metal's appearance only changes after the failure, not before it.
There's an analogy we used in the cycle-life post that applies here again: imagine a car tire whose tread is on the inside of the rubber, where you can't look at it. You could only tell it was bald by the sudden blowout on the highway. That's the situation with a spring. The wear is invisible until the failure.
When a customer says "the other one looks fine," we translate that to "the other one hasn't broken YET." Both statements are true; only one tells you about future behavior.
What this means for you: asking for a visual inspection of the second spring is a reasonable thing to do. We'll do it every time. But understand what the inspection can and can't tell you — it confirms the spring is currently intact, not that the spring has significant remaining life. On a 6+ year old double-spring door where one just broke, those are very different statements.
When Replacing One Spring IS the Right Answer
The policy is "always both" for double-spring systems. But not every situation is a double-spring system, so let's document the cases where replacing one spring is legitimately the right call:
Single-spring doors. Many smaller residential doors (especially older 7-foot single-car doors) are designed with one spring. Obvious case — there is no second spring to replace. Single-spring replacement standalone is $449.
The broken spring was recently replaced under warranty. If we installed one spring on a double-spring door 8 months ago under our 1-year warranty, and that one fails, we replace it under warranty — we don't force replacement of its mate, because the mate is now far newer than the warranty spring we're honoring. Different cycle budgets, different logic.
Extreme mismatch scenario. If a door was retrofitted with a higher-cycle spring on one side years after the original, and only one side has failed, the remaining high-cycle spring may have meaningful life left. This is rare but real. We document it before quoting.
Springs of different ages on the same door (inherited from prior contractor). If the previous service visit replaced only one, and a year later the OTHER one fails, the first replacement spring may still have significant life. Case-by-case judgment, always written down on the invoice.
These exceptions cover maybe 5% of calls. The other 95% are straightforward double-spring systems where "both" is both the correct and the cheaper answer.
What this means for you: we don't apply the policy mechanically. If the exception applies to you, we'll say so on the spot. But we also won't let you talk us into a "save money on one" play that the math won't support.
What the Spring Visit Actually Looks Like
The process is straightforward and we walk through it the same way on every call:
1. We weigh the door. Actual weight in pounds, with the springs disconnected. Spring tension must match door weight; we can't guess.
2. We pull coil stock to size. The truck carries spring wire of several diameters. We cut both springs from that stock to the exact length the door weight requires. This is the old-fashioned method — pre-packaged one-size-fits-all springs are a shortcut that often produces a near-fit, not an exact one.
3. We wind both springs on with winding bars. Never screwdrivers. Screwdrivers slip and put technicians in emergency rooms; winding bars are the right tool and we use them.
4. We balance-test by hand with the opener disconnected. A properly balanced door should feel like it weighs 8-10 pounds when manually lifted. If it's heavier, the tension is off and we adjust before we call the work done.
5. We run the full cycle under the opener multiple times and test the auto-reverse and safety sensors before the tools go back in the truck.
The whole visit is typically 45 minutes to an hour. You get a printed invoice with the work done, the warranty terms, and the phone number to call if anything's off next week. (Same phone number as the one that booked the call.)
What this means for you: "replace both springs" isn't more labor than "replace one" by much — the setup, inspection, and balance testing are identical either way. What changes is the time on the coil stock and the second spring material. That's why the $599 double isn't double the $449 single.
What Both Costs
Double-spring replacement (standard): $599 for doors up to 380 lbs. Includes service call, 17-point inspection, both springs custom-cut to door weight, 1-year parts warranty.
Single-spring replacement (standard): $449 for doors up to 175 lbs. Same inclusions, one spring.
Heavy-duty double-spring replacement: $959-$1,249 depending on final door weight. For doors over 380 lbs, quoted on-site after weight measurement.
Full pricing on the pricing-and-policies page. Nothing in the pricing changes whether you're a new or returning customer, whether it's a weekday or weekend, or whether you call from Sarasota or North Port.
The Honest Summary
The "always replace both" policy sounds like an upsell until you do the math. Then it becomes the opposite — the cheaper, more reliable, more honest answer.
Both springs share the work. Both springs share the fatigue. When one fails, the other is at the same point in its life, even if it hasn't snapped yet. Replacing both today costs $599. Splitting it across two visits costs $898 and strands you in between.
We don't make money by doing work that doesn't pay back for the customer. And we don't spend the 60 seconds it takes to explain this on every spring call because we're trying to upsell — we spend it because explaining the math is the only way the policy stops sounding like an upsell.
What this means for you: if at the end of the conversation you still want only the broken spring replaced, we'll do it. But we'll document on the invoice that we showed you the math and you chose the two-visit path. The second call will be at published pricing, on the same phone number, at your convenience.
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