System Replacement · May 2026
Double Spring System
Replacement Cost
When both halves of the lifting pair come out and go back in together. The price, the balance argument, the cycle-life math, and why no serious contractor will leave a worn spring on the shaft next to a new one.
Headline number: $275 to $550 installed for the pair, depending on door weight, wire gauge, and labor market.
Aggregated price ranges from HomeAdvisor and Angi, May 2026.
How a double-spring system actually works
Above the door, mounted to a centre bracket on the header, sits a horizontal torsion shaft. On each end of that shaft is a cable drum. Wound around the shaft on each side of the centre bracket is a torsion spring, anchored at the stationary cone (centre) and the winding cone (outer end). When the technician winds the spring with a calibrated bar, they store rotational energy. That energy lifts the door when the opener engages or when you pull the handle. The two springs work in parallel, sharing the load.
On a 16x7 insulated steel door weighing roughly 400 pounds, each spring is asked to lift about 200 pounds. On a heavier wood carriage-style door, each spring may carry 250 pounds. Engineering tables from the Door and Access Systems Manufacturers Association map door weight to wire gauge, inside diameter, and spring length. A correctly specified pair has each spring operating well within its rated working stress, which is what gives the system its ten thousand or twenty thousand cycle life.
The pair replacement standard
The industry standard, formalised in the IDA installer training curriculum and adopted by every major manufacturer, is that a double-spring system gets both springs replaced together when one fails. The reasoning is mechanical, economic, and warranty-driven all at once.
Mechanically, the two springs were installed at the same time, wound to the same turn count, and have done identical work lifting the same door the same number of times. The metallurgical fatigue accumulated in the steel is, to within tolerances of manufacture, the same on both. When one yields, the other is in the final fraction of its rated life. Statistically, surviving springs replaced on a single-spring policy return for service within ninety days in the majority of documented cases.
Economically, the second spring adds roughly $50 to $80 in parts and ten extra minutes of labor. A return service call carries the full dispatch fee, a fresh trip charge, and a fresh markup, totalling $150 or more. The customer who insists on single-spring replacement saves $75 in the short run and pays $150 in the long run, with a closed garage door for the interval.
Warranty-wise, a contractor installing a fresh spring next to a worn one cannot warranty the system. The first failure of the surviving spring will be claimed against the new install. Most insurers price labor warranties on the assumption of full-system parity. National franchises simply will not offer this work. Some independents will, but only on a no-warranty basis, which is rarely a good trade for the customer.
The balance argument
Even if you accept the premature-failure risk, a mismatched pair lifts the door unevenly. The new spring, wound to factory specification, provides full torque. The old spring, at the end of its life, provides something less. The result is a door that tilts slightly when raised and rests slightly off level when closed. The opener compensates by drawing more current on one side of the lift, which heats the gear set unevenly. Over months, the opener gear wears prematurely and the cables on the high-torque side begin to stretch and fray ahead of the cables on the low-torque side.
Most homeowners do not notice the tilt until the cable on the high-torque side jumps the drum. At that point the door binds in the track, the opener strains, and a service call escalates from a $300 single spring replacement to a $600 cable, spring, and drum job. The pair replacement standard exists to prevent exactly that sequence.
Cost breakdown for the pair
On a typical residential 16x7 insulated steel door, the line items look roughly like this. Parts: $80 to $160 for the pair of standard wire torsion springs. Labor: $150 to $250 for the swap, including releasing and re-winding the system, checking cable tension, and a balance test. Dispatch and travel: $25 to $50, often rolled into the labor line on the invoice. Optional upgrades: a high-cycle spring upgrade adds $80 to $150, fresh cables add $30 to $60, fresh rollers add $40 to $80.
A bare-minimum pair replacement on a light door (single-car, uninsulated, 9x7) lands closer to $275. A full pair plus cable plus roller refresh on a heavy insulated double-car door lands closer to $550. The $400 mid-point covers the bulk of the residential market.
When the system needs more than springs
If the broken spring took out the cable on its side when it snapped, or if the door jumped the track on the way down, the scope of work expands. A spring break that happens with the door fully closed is a relatively contained event: the broken spring stays on the shaft, the cables stay on the drums, and the door stays where it is. A spring break that happens mid-lift can throw the door off level, which can knock cables off drums, bend a panel against the track, or break a hinge. In the worst case, a panel replacement adds $200 to $500 to the job and pushes the total above $750.
For an unbroken-door spring failure (door closed, both springs replaced cleanly), expect to be back in normal operation within an hour. For a mid-lift failure with collateral damage, expect a longer site visit and a parts-order delay if a panel needs to be sourced from the manufacturer.
What to ask before the technician winds the new springs
- Are you replacing the pair (yes is the right answer)?
- What wire gauge and inside diameter are you using, and does that match my door weight?
- Are the cables in good condition or do they need replacement at the same time?
- Will you do a balance test after installing the new pair?
- What is the parts warranty on the new springs?
- Do you offer high-cycle springs at a price difference, and what is that difference?
Related cost guides on this site
Frequently Asked
What is a double-spring system?
A double-spring system uses two torsion springs mounted on a shaft above the door, one on each side of the centre bracket. The pair shares the lifting load. Most doors heavier than 200 pounds use a double-spring system because no single spring at residential wire gauges can balance that much door weight reliably.
How much does it cost to replace a double-spring system?
A complete double-spring replacement costs $275 to $550 installed in 2026 for a residential door. The all-in number depends on door weight, wire gauge, cycle rating of the springs, and your local labor market.
Why will some companies not replace only the broken spring?
National franchises and most insured local contractors refuse single-spring replacements on double-spring systems because the warranty exposure is too high. The surviving spring has the same cycle count as the failed spring and is statistically very close to its own failure point. A mismatched pair also lifts the door unevenly, which damages the cables, the cable drums, and the opener gear set.
Should the second spring really fail soon?
Failure timing for the surviving spring depends on the cycle rating and the cycle count at the moment of the first failure. If the broken spring was rated for ten thousand cycles and you got eight years out of it at four cycles per day, the surviving spring is statistically within months of its own failure. Households tracking cycle data via smart openers see the second spring fail within ninety days in roughly four out of five cases.
Can I upgrade to high-cycle springs during this job?
Yes, and most technicians will offer the upgrade. High-cycle springs are rated for twenty-five thousand to one hundred thousand cycles. The upgrade adds roughly $80 to $150 to the total bill on a residential door but doubles to quintuples the service life. For a household that opens the door more than five times a day, it is the right call.