Torsion or extension: two different systems
Torsion springs sit on a shaft above the door opening and twist to store energy. Extension springs run alongside the horizontal tracks and stretch as the door closes. Each system uses different springs, mounting hardware and safety components, and each is sized to the weight of the door it lifts.
Torsion hardware is generally more involved to replace and is specified by wire size, inside diameter and length, which must suit the door’s weight and height. Extension systems are simpler but should include safety cables through the springs so a broken spring cannot travel. The system you have is the first thing that frames the quote.
One spring or a matched pair
Many residential torsion systems use two springs. When one breaks, the other has usually been through the same number of cycles and is near the end of its life. Replacing both at once restores balance on both sides of the door and avoids a second visit, which is why the recommendation is common. A single-spring system or a very recently replaced partner spring can change that advice.
Ask the technician to explain the condition of the remaining spring and the reasoning either way. The decision should be yours, made with the facts in front of you.
Cycle rating
A cycle is one full open and close. Springs are manufactured to an expected number of cycles, and higher-cycle springs use more material to reach that life. Industry guidance from DASMA notes that correct matching, installation, environment and corrosion all affect how long a spring actually lasts, so a rating describes expected use rather than a promise in years.
For a household that opens the garage many times a day, a higher-cycle spring can be worth comparing. For a door used a few times a week, the standard rating may be sensible. A good quote presents the options with their price difference and lets you choose.
Hardware around the spring
- Cables and drums. A spring failure can slacken or fray lift cables. Cables that show wear are usually replaced during the same visit.
- Center and end bearings. Worn bearings on the torsion shaft add friction and noise and shorten the life of new springs.
- Bottom brackets. On many doors these connect to the cables and are under tension; corroded or cracked brackets are a safety item.
- Door balance and opener settings. After new springs are installed the door is balanced and the opener’s travel and force are checked so the opener is not doing the spring’s work.
Access and door condition
Low headroom, a door that has had sections replaced, corroded fasteners, or a detached garage with limited working space can add time to the job. A door that was converted at some point from extension to torsion, or that carries non-original hardware, needs a closer look before parts are selected.
What the spring replacement quote should list
- The spring system and whether one spring or a pair is being replaced.
- The cycle rating offered, and the alternative if more than one is available.
- Any cables, bearings, brackets or other hardware being replaced, each named.
- Labor, any diagnostic or trip charge, and how it relates to the repair price.
- Warranty terms for the springs and the labor, if offered.
Common spring questions
Can a broken spring be repaired instead of replaced?
No. A fractured spring has lost its structure; adjusting tension or lubricating it cannot restore it. Replacement with a correctly matched spring is the repair.
Will a stronger opener compensate for a weak or broken spring?
No. The opener is designed to move a balanced door, not to lift its full weight. Running an opener against a broken spring strains the opener and can damage it.
How do I know the quote is for the right spring?
Ask the technician how the spring was matched: door weight, height, and the existing system’s measurements. A spring chosen to fit the door that is installed now, including any replacement sections, is the right one.