2026-08-21 7 min read
In our years serving Bow, we've seen this problem again and again: homeowners don't know the difference between torsion and extension garage door springs until one snaps without warning. Torsion springs typically last 7 to 9 years and handle the weight more efficiently, while extension springs wear faster and pose greater safety risks. Understanding which type you have can save you money, injury, and a lot of stress.
Your garage door weighs between 300 and 500 pounds. That enormous load doesn't move up and down on its own. Two springs counterbalance that weight, holding tension so your opener doesn't strain itself into early failure.
Torsion springs wind tightly around a shaft above your door. They twist and unwind with every cycle, distributing force evenly across their entire length. Extension springs stretch along the sides of your garage opening, pulling down as the door closes and releasing as it rises. Both work, but their durability and failure modes are entirely different.
Torsion springs fail more predictably. When they wear out, they typically snap cleanly and stay in place. Extension springs, by contrast, can shoot across your garage like a projectile when they break, potentially hitting a person or vehicle. We've pulled broken extension spring coils from car windshields and garage walls more times than we'd like to admit.
Extension springs last only 4 to 6 years under normal conditions. They rely on metal hooks and pulleys to manage the door's weight, which means multiple points of wear and failure. Every time your door opens or closes, these springs stretch and contract, grinding against the same metal hardware.
The danger lies in how they fail. A snapped extension spring doesn't stay neatly above your head. The metal can snap backward with enough force to dent vehicles, shatter mirrors, or injure anyone nearby. Children and pets are especially vulnerable.
Rust accelerates this problem in New Hampshire's climate. Winter salt spray and humidity corrode the metal from the inside out, creating weak points that snap under normal pressure. We recommend a professional inspection every 2 years if you use an extension spring system.
Torsion springs handle the same workload more intelligently. Instead of stretching, they store energy through rotational tension. A single torsion spring can lift your entire garage door, which is why many modern systems use two for redundancy.
Because torsion springs wind tightly around a shaft, a snapped spring stays contained. It won't fly across your garage or strike your car. The failure is safer, though still an immediate repair need. If one torsion spring breaks, the other can't handle full load alone. Your door may jam halfway, or your opener will strain trying to operate the unbalanced system.
Torsion springs need less maintenance but require precision installation. Incorrect tension settings can shorten lifespan dramatically. That's why DIY replacement is genuinely dangerous. The shaft wound under tension can unwind violently if disturbed improperly, causing serious injury. Our team uses specialized tools and years of training to handle this safely.
**Need garage door springs in Bow today?** Call (978) 690-4680. we cover same-day service across the area.
Walk into your garage and look above the door. If you see a tightly wound metal coil running horizontally above the center of the opening, you have torsion springs. If you see two vertical springs running up the left and right sides near the pulleys, you have extension springs.
Location matters for cost and safety planning. Torsion springs require professional removal and installation because of the tension involved. Garage door spring replacement in Bow costs depend on the type and your door's weight. A torsion spring typically runs between $250 and $400 per spring plus labor. Extension springs are cheaper to purchase but fail more often, costing more over time.
Don't attempt replacement yourself. We've treated people injured by improperly released spring tension, and those injuries are preventable. Call a licensed technician to schedule a free quote and let us handle the risk.
Bow's winters compound spring wear. Cold temperatures make metal brittle. Salt from roads and driveways corrodes coils and pulleys. Humidity swings in spring and fall create rust from the inside out. A spring that might last 8 years in Arizona lasts 6 or 7 here.
Check your springs monthly during winter and spring. Look for surface rust, visible cracks, or asymmetrical cable positioning. If your door opens unevenly, hesitates on one side, or sounds different than usual, a spring may be failing. Learn more about routine spring inspection to catch problems early.
A broken spring is not a "fix it later" problem. Your garage door will either jam or hang unevenly, straining your opener and possibly locking you in or out. A same-day repair typically costs $350 to $500 for the spring plus labor. Waiting a week and running the door on a broken spring can double that cost when your opener burns out.
Our emergency garage door service in Bow explains why speed has a price, but that speed also prevents secondary damage.
If one spring is broken and the door is over 10 years old, replace both springs at the same time. Matching pairs wear evenly and fail together, preventing future lopsided operation. If your door is newer, replacing the broken spring alone is acceptable. Ask for an estimate on both scenarios.
Contact Garage Door Bow today. We'll inspect your system, tell you exactly what type of springs you have, and provide a transparent cost estimate before we touch anything.
Your safety is our priority. Springs fail without warning. Don't wait for the crash.
How long do garage door springs last? Torsion springs typically last 7 to 9 years with proper maintenance. Extension springs wear faster, usually 4 to 6 years. Frequency of use, climate, and proper lubrication affect lifespan significantly. Annual inspections catch early wear.
Can I replace a garage door spring myself? No. Spring replacement involves extreme tension and requires specialized tools. Improper removal causes serious injury or death. Always hire a licensed professional. The cost of professional service is far less than the cost of injury.
What's the difference between torsion and extension springs? Torsion springs wind around a shaft and store rotational energy. Extension springs stretch along the sides and store linear energy. Torsion springs are safer, last longer, and cost more upfront but save money over time through fewer replacements.
How much does a broken spring repair cost in Bow? A single spring replacement costs $250 to $400 plus labor, usually $100 to $200. Many technicians recommend replacing both springs together for $500 to $700 total. Emergency same-day service adds a service charge.
What are the warning signs of a failing spring? A sticking or squeaking door, uneven opening, visible rust or cracks on the spring, or cable sagging are red flags. If your door is harder to open or your opener struggles, call immediately. Don't force the door.