Why Garage Door Springs Break in Dover: And What to Do About It
2026-04-25 8 min read
If you've ever walked into your garage in the morning, hit the opener button, and watched the door barely lift six inches before the motor gives up. you've probably experienced a broken spring. It's one of the most common garage door problems we see in Dover, and it's also one of the most misunderstood.
Homeowners often assume the opener is the problem. They unplug it, reset it, call a repair company complaining about the motor. But nine times out of ten, the opener is fine. The spring is gone. And without a working spring, even the beefiest opener on the market can't lift a standard garage door on its own.
Here's what's actually happening. and what to do about it.
What Garage Door Springs Actually Do
Your garage door weighs anywhere from 130 to 400 pounds depending on the material and insulation. Springs are the counterbalance system that makes that weight manageable. When the door opens, the springs release stored tension to help lift. When it closes, they wind back up. The opener. whether belt or chain drive. is really just there to automate the process. The springs do the heavy work.
There are two main types:
- Torsion springs mount horizontally above the door opening on a steel shaft. Most modern Dover homes have these. They're more durable and safer when they break because the spring stays on the shaft rather than flying loose. - Extension springs run along the horizontal tracks on each side of the door. They're common in older homes and detached garages throughout the Dover area. When these fail, they can snap with considerable force. which is why safety cables are important.
Why Springs Break in Dover Specifically
Springs don't last forever. Most are rated for 10,000 cycles. one cycle being one open and one close. At four uses per day, that's roughly seven years. Heavy-use households can burn through springs faster.
But in Dover, cycles alone don't tell the whole story. The local climate plays a real role.
The Freeze-Thaw Problem
Dover's winters are genuinely cold. January averages lows around 20°F, and temperatures can swing 30 or 40 degrees in a single day during the shoulder seasons. March and November especially. Metal contracts in the cold and expands in the warmth. Springs that spend months cycling through those temperature extremes develop stress fractures over time, even if they haven't hit their cycle count.
This is why we see a spike in spring failures in late winter and early spring. The spring has been contracting and expanding through February's worst cold, and then a mild day in March pushes it over the edge.
Humidity and Rust
Dover sits in New Hampshire's Seacoast region, which means year-round humidity that's higher than inland areas. Relative humidity in Dover hovers around 78,80% for much of the year. Metal springs that aren't properly lubricated will develop surface rust, which creates micro-cracks and accelerates wear. A rusty spring doesn't just look bad. it breaks sooner.
Homeowners in neighborhoods close to the Cocheco and Bellamy Rivers, or near Dover Point, often see faster spring wear because of the added moisture in the air. The same issue affects residents in nearby Portsmouth and Hampton along the coast.
Signs Your Spring Is Failing (Before It Snaps)
Springs rarely give much warning, but there are signs if you know what to look for:
- The door feels unusually heavy when you try to open it manually. Disconnect the opener and lift by hand. it should go up easily. If it's a struggle, the spring isn't providing proper counterbalance. - Visible gaps in the spring coil. A torsion spring that's broken will often show a clear separation in the coil. You can see this from the floor. - Squeaking or grinding when the door moves. This can mean the spring is dry and developing rust. Lubricate it immediately. this is one case where maintenance genuinely extends spring life. Our post on what garage door noises mean covers this in more detail. - The door opens unevenly, with one side higher than the other. If you have extension springs, this usually means one has broken or stretched. - The opener strains or stops partway. Many modern openers have safety features that cut power when resistance is too high. A broken spring creates exactly that kind of resistance.
Can You Replace a Spring Yourself?
Honestly. this is one repair where the answer is almost always no, and not just because it's complicated.
Torsion springs are under extreme tension. A torsion spring on a standard two-car door can store enough energy to cause serious injury if mishandled. Professional technicians use winding bars and follow specific procedures for a reason. Improper winding or a slip during the process can result in the spring releasing violently.
Extension springs are somewhat less dangerous but still pose real risks, especially if they're older and the safety cables have worn through.
Beyond safety, there's a practical issue: spring sizing matters. Springs are matched to the door's weight and height. Installing the wrong spring affects balance, stresses the opener, and can shorten the life of every other component. A technician will measure the door, calculate the correct spring specs, and install both springs at once. because if one has failed, the other is usually close behind.
For anything spring-related, scheduling a professional repair is the right call.
What Happens If You Ignore a Broken Spring
Some homeowners try to keep using the door on the opener alone after a spring breaks. This is hard on the opener motor, stresses the cables, and can damage the tracks. In some cases, the door comes down unevenly and bends the panels. What started as a $200,$300 spring replacement can turn into a much more expensive repair. or a full door replacement.
If your spring is broken, disconnect the opener and don't use the door until it's fixed. You can see all our services to understand what a full assessment covers.
How Long Does a Spring Repair Take?
For a straightforward torsion spring replacement on a standard Dover residential door, a professional technician can usually complete the job in under an hour. Both springs are replaced at the same time (replacing just one leaves you with a mismatched pair where the second will fail shortly). The technician will also check cable condition, lubricate moving parts, and test the balance before leaving.
For more on keeping your door running well year-round, the cold weather preparation guide has practical tips that apply to spring maintenance too.
Frequently Asked Questions
How much does garage door spring replacement cost in Dover, NH?
For most standard residential doors in Dover, spring replacement runs between $150 and $350 depending on the spring type, door weight, and whether the cables need replacement at the same time. Two-car doors or heavy wooden doors at the higher end of that range. Always get a quote that includes labor and both springs. replacing just one is a short-term fix.
How do I know if I have torsion springs or extension springs?
Look above the door when it's closed. If you see a single horizontal spring (or two springs side by side) mounted on a steel bar above the center of the door, those are torsion springs. If you see springs running along the horizontal tracks on either side of the door, those are extension springs. Torsion springs are more common in homes built after the mid-1990s.
My spring just broke. is it safe to use the door manually?
Only if you can do so carefully and the door doesn't feel dangerously heavy. Disconnect the opener by pulling the red emergency release cord, then try lifting the door by hand from the bottom. If it goes up with reasonable effort and stays up on its own, you can use it manually in an emergency. If it's extremely heavy or won't stay open, don't use it until the spring is replaced. the door could come down unexpectedly.