Torsion vs Extension Springs: Which Does Your Sudbury Garage Door Need?
2026-07-31 7 min read
In our years serving Sudbury, we've seen this problem again and again: homeowners don't realize they have two completely different types of garage door springs, and when one fails, they call in thinking any spring will do. The truth is simpler. Your door uses either a torsion spring mounted above the door, or extension springs on either side. Knowing which you have matters because the repair cost, replacement timeline, and safety risk all depend on it.
Torsion Springs vs Extension Springs: The Core Difference
Torsion springs work by twisting. A single thick spring sits horizontally above your garage door opening, wound tight like a clock spring. When you open the door, the spring unwinds and transfers energy to the pulley system. This design supports the door's full weight during the entire lift cycle.
Extension springs do the opposite. They stretch. Two springs run parallel along the sides of the door, above the horizontal tracks. When the door closes, these springs extend and store energy. When you press the opener, they snap back and assist the lift.
Torsion springs last longer (typically 7 to 9 years with average use), while extension springs wear out faster (5 to 7 years). Torsion is also safer because a snapped torsion spring fails more predictably, whereas a snapped extension spring can send a cable whipping across your garage at high speed.
Most residential doors in Sudbury use torsion springs. Commercial and older installations often use extension springs.
Why Springs Fail and When You Need a Replacement
Springs fail from cycle fatigue. Every open-close cycle stresses the metal. A typical garage door opens and closes 3 to 5 times daily, which adds up to 1,000 to 1,500 cycles per year. After 7 to 9 years, the metal becomes brittle and snaps without warning.
Cold weather accelerates failure. Winter in Massachusetts makes metal contract, and the stress compounds. If your door suddenly won't open or you hear a loud bang from above the door, you likely have a snapped spring. Don't force the opener; this can damage the cable and drum.
If you suspect a snapped spring, stop using the door and get a same-day estimate from our team. A broken spring isn't a repair you should attempt yourself. Torsion springs are under extreme tension, and improper handling causes serious injury.
**Need garage door springs in Sudbury today?** Call 19784403625. we cover same-day service across the area.
Cost Breakdown: What You'll Actually Pay
Torsion spring replacement typically costs between $150 and $300 per spring, plus labor. If both springs need replacement (a smart move since the second one usually fails within months), budget $400 to $600 total. Extension springs run $75 to $150 per spring, but labor for both types is similar because the work is equally involved.
We've written a detailed cost guide for garage door springs in Sudbury that breaks down pricing by spring type and door size. The short version: don't cheap out on springs. A quality spring from a reputable installer lasts the full 7 to 9 years and won't fail mid-winter.
Our pricing at Sudbury Garage Doors is transparent. We give you an honest estimate before we touch anything, and we never upsell parts you don't need. Many shops will recommend replacing both springs even if only one failed. We recommend it only when the second spring is within 1 to 2 years of failure based on age and use.
When to Repair vs Replace the Entire Door
If your door is 15 to 20 years old and springs fail, ask yourself: is the rest of the door still solid? If panels are dented, the opener is weak, or the tracks are bent, spring replacement might be throwing good money after bad. Read our guide on repair versus replacement to help you decide.
For most Sudbury homeowners with doors less than 12 years old, spring replacement is the right call. The rest of the system usually has plenty of life left.
Our Approach to Spring Service
We measure your door, identify the spring type, check the cable condition, and test the balance. A properly balanced door shouldn't fall if the spring is manually released. If it does, that's another sign springs are near the end.
We also inspect your safety features while we're there. A snapped spring is the number one reason garage doors fail safety reversal tests. If we find issues, we let you know upfront so you can make an informed decision.
Get Your Springs Fixed Today
Spring failure doesn't wait for convenient timing. It happens in the middle of winter, on a Saturday morning, or when you're late for work. That's why we offer same-day service across Sudbury and nearby towns. Schedule a free quote or call us at 19784403625.
We'll tell you exactly what you need, what it costs, and when we can get it done. No surprises. No pressure. Just honest garage door service.
Frequently Asked Questions
How do I know if my spring is torsion or extension? Look above your door opening. If you see a single horizontal spring with a large pulley in the center, that's torsion. If you see two springs running along the side tracks, those are extension springs. Torsion is more common in newer homes.
Can I replace just one spring? Technically yes, but both springs age together. If one fails, the other is usually 1 to 2 years behind. Replacing both at once saves you a second service call and prevents imbalance issues that wear out the opener faster.
How long does spring replacement take? About 1 to 2 hours for a professional. We can often fit same-day appointments for Sudbury customers. DIY attempts typically take longer and carry serious safety risk.
What causes springs to snap in winter? Cold metal becomes brittle. Thermal contraction adds stress to already fatigued metal. Springs don't fail because of cold alone, but winter accelerates failure for springs that are already 7 to 9 years old.
Is spring replacement expensive compared to a new door? No. Spring replacement runs $400 to $600. A new door costs $1,500 to $4,000 installed. Unless your door is very old or damaged, springs are the smart investment.