12544 15th Ave NE UNIT 309, Seattle, WA 98125
Extension springs are found on many older residential garage door systems throughout Seattle. When a spring weakens, loses tension, or breaks, the door can become unbalanced or unsafe to operate. Our technicians inspect the full lifting system and restore safe, stable operation.
Extension springs are mounted along the horizontal track sections on either side of the garage door. Unlike torsion springs, which rotate on a shaft above the door opening, extension springs stretch outward under tension when the door closes and contract as it opens. They work together with lift cables, pulleys, and safety cables to counterbalance the weight of the door panel. Over time, repeated stretching and contraction cycles fatigue the spring steel. When one spring weakens or breaks, the door can hang unevenly, strain the opener motor, or drop suddenly on the weaker side.
At CHS Garage Door Repair, we match replacement springs to the specific weight and height of your door, not just the nearest available size. Correct spring sizing is critical because an undersized spring places excess load on the cables and opener, while an oversized spring creates overpowering tension that can make the door difficult to hold open manually. After installing new springs, we verify balance by disconnecting the opener and checking whether the door holds steady at the midpoint of travel, the standard field test for correct counterbalance.
Extension springs typically show warning signs before complete failure. Knowing what to look and listen for can help you address the problem before the door becomes unsafe to use.
When one extension spring loses tension faster than the other, the door begins lifting unevenly. The weaker side carries less of the load, causing the leading edge to tilt as the door travels. Left unaddressed, this imbalance transfers stress to the rollers, track, and opener bracket on the heavier side. Replacing both springs at the same time restores even tension and prevents the same problem from developing on the other side shortly after.
A broken extension spring is usually visible as a gap in the coil or a spring hanging loose alongside the horizontal track. Fatigued springs may show distorted coils, rust along the outer surface, or a noticeably stretched appearance compared to the opposite side. Springs with any of these signs are approaching failure and should be replaced before they snap. Rust is particularly common on older Seattle-area garage systems because of the region’s consistent moisture exposure.
A garage door opener is sized to move a properly balanced door, not to compensate for a failing spring. When extension spring tension drops, the opener must work harder on every cycle, increasing motor temperature and wear on the drive gear and carriage. Homeowners often notice the opener moving more slowly than usual, reversing partway through travel, or triggering the overload cutoff. If the opener is straining, the spring system should be inspected before the opener itself is assumed to be the problem.
Safety cables run through the center of each extension spring and anchor to the rear track bracket. Their purpose is to contain the spring if it breaks under tension so the coils do not move freely inside the garage. Many older garage systems in Seattle, particularly in detached garages built before the 1990s, were never fitted with safety cables or have cables that are improperly routed or corroded. A missing or damaged safety cable is a significant hazard that should be corrected during any extension spring service.
When an extension spring breaks or loses tension, the lift cable on that side loses its load and goes slack. A slack cable can slip off the pulley wheel or bottom bracket, making the door inoperable until both the spring and cable routing are corrected. In some cases the cable frays where it contacts a worn pulley, creating a failure that looks like a cable problem but originates from spring tension loss. We inspect pulleys and cables on every extension spring call.
Extension spring systems use a pair of stationary pulleys mounted at the rear of the horizontal track and a pair of movable pulleys attached to the spring ends. As these pulleys age, the axle pins wear, the wheel surfaces develop flat spots, and the cable routing groove can crack or deform. Worn pulleys create friction that unbalances the system even when the springs themselves are still serviceable. We replace pulleys as needed when the condition warrants it, rather than leaving worn hardware in place around a new spring.
Our technicians work regularly on older detached garages throughout neighborhoods like Ballard, Green Lake, Queen Anne, Wallingford, and Capitol Hill, where extension spring systems are still common. These older setups often have low-clearance ceilings, non-standard track configurations, or mismatched replacement hardware from previous repairs. Correctly sizing replacement springs for these systems requires measuring door weight and height, not simply matching the old spring dimensions, because previous repairs may have installed the wrong size to begin with.
Before any work starts, we provide a written itemized estimate. After the repair, we test the door through several full operating cycles, check the opener’s force settings to confirm it is not overworking, and verify that the safety reversal function engages correctly. We carry replacement springs, cables, pulleys, and hardware on every vehicle so most repairs are completed on the first visit without waiting on a parts order.
Itemized cost provided before work begins. No surprises on the invoice.
License #CHSGAGD820QO. Full liability and workers' compensation coverage.
Springs, cables, pulleys, and hardware on board for most repairs.
1-year warranty on parts. 3-year warranty on spring replacements.
Questions Seattle homeowners commonly ask about extension spring repair and replacement.
Extension springs are mounted horizontally along the track sections on either side of the door and stretch outward as the door closes. Torsion springs are mounted on a shaft directly above the door opening and work by twisting rather than stretching. Torsion systems generally provide smoother, more balanced operation and longer cycle ratings, which is why they became standard in most new residential construction from the mid-1990s onward. Many older Seattle homes, particularly those with detached garages or low headroom ceilings, still use extension spring systems that can operate safely when properly maintained and correctly sized.
The cost depends on the number of springs being replaced, whether cables or pulleys also need attention, and whether safety cables need to be added or corrected. Replacing a single spring is less common because technicians typically recommend replacing both at the same time to keep tension even. Additional components such as worn pulleys, frayed cables, or missing safety cables will increase the total. We provide a written itemized estimate before any work begins so you know exactly what is included and at what cost.
A door with a broken extension spring should not be operated until it is repaired. With only one functioning spring, the door is unbalanced and places extreme stress on the opener, cables, and the remaining spring. Forcing an unbalanced door open can snap the remaining spring, cause a cable to jump off its pulley, or damage the opener motor. In some cases the door can drop suddenly if the remaining spring also fails mid-travel. The safest approach is to leave the door in its current position and arrange for a technician to address it before attempting further operation.
Safety cables are steel cables that run through the center of each extension spring and attach to the rear track bracket at one end and the front anchor bracket at the other. Their function is to contain the spring coils if the spring snaps under tension, preventing the broken sections from flying through the garage space. Safety cables are required by current safety standards and are included in all extension spring installations we perform. If your existing system does not have them or has cables that are improperly routed, we will identify that during the inspection and include the correction in the estimate.
Extension springs store significant mechanical energy even on smaller residential doors. The process of removing a tensioned spring and installing a correctly sized replacement also requires working with the pulley and cable system under load, which adds complexity beyond simply unbolting and rebolting a component. Incorrect spring sizing is difficult to identify visually and can lead to ongoing balance problems, opener strain, or premature hardware failure. Professional replacement ensures the spring is matched to the actual door weight and the full system is verified through a balance test before the door is returned to service.
Mobile service across Bothell: Canyon Park, North Creek, Thrashers Corner, Shelton View-Meridian, Maywood-Beckstrom Hill, and Downtown Bothell. Working near Woodinville or Mill Creek. We can confirm availability by phone.
Serving Seattle, Bothell, Bellevue, Kirkland, Redmond, and 20+ communities across King and Snohomish counties.
Available Sun through Thu · Licensed #CHSGAGD820QO · Written Estimates · 1-Year Parts Warranty
