Extension spring replacement is the repair of the stretched springs beside the horizontal tracks, including their safety containment when that is part of the system. Extension springs operate alongside the horizontal tracks rather than on a shaft above the door. If one breaks or stretches unevenly, the door can tilt or become difficult to move. Describe the visible damage from a safe distance and leave the door unused until the assembly is assessed.
Review the complete spring arrangement
The repair assessment includes the extension springs and the components that transfer their force to the door. Worn pulleys, a damaged cable or missing containment hardware should be discussed as part of the proposed work, not discovered after a spring has been ordered.
Containment cables serve a different purpose
A safety cable through an extension spring helps contain it if it breaks. That cable is different from the lifting cable that moves the door. Replacing one does not automatically repair a defect in the other. Ask the technician to identify both in the estimate.
Keep a replacement and a conversion separate
Replacing an existing extension system and converting to torsion hardware are different projects. A conversion needs a separate assessment of available space, door compatibility and supporting structure. We explain the suitable options before you approve the scope.
Parts of this job
The job covers those side springs, the pulleys they run through, and the hardware that keeps a broken spring from flying, assessed for the door you have. Do not disconnect them. This page stays available so extension work is not folded into the torsion page.
What is a different job
Torsion spring replacement is a different job for the shaft above the door, and that URL remains. The general broken-spring page is a different job when the spring type is unknown. A new door is a different job when the door itself is being replaced instead of its extension springs.
Your questions, answered.
Is an extension spring safe to handle with the door closed?
No. Extension springs can be under substantial tension when the door is closed. Leave spring and related cable work to a trained door technician.
Does every extension-spring repair require a new door?
No. The condition of the door, mounting points and lifting hardware determines whether the existing system can be repaired. A spring failure alone is not a reason to replace every component.
Are extension springs just another name for torsion springs?
No. They sit in a different place and this page is only for the extension type. Use the torsion page for the overhead shaft.
