How Garage Door Springs Work: A Homeowner's Guide

How Garage Door Springs Work

Your garage door is the largest moving object in your home, and the springs are doing almost all the heavy lifting — literally. A standard double garage door weighs between 150 and 250 pounds. Without springs to counterbalance that weight, your opener motor would burn out in weeks trying to lift it. Understanding how these springs work helps you recognize problems early and make informed decisions about repair.

Torsion vs Extension Springs

There are two main types of garage door springs, and most homes in the Tacoma, Olympia, and Lakewood area have one or the other.

Torsion springs mount on a steel shaft directly above the garage door opening. When the door closes, the spring winds up and stores energy. When you open the door, that stored energy unwinds and lifts the door. Torsion springs provide smoother, more controlled movement and are the standard on most doors installed in the last 20 years.Extension springs run along the horizontal tracks on both sides of the door. They stretch when the door closes and contract to help lift it when opening. Extension springs are more common on older homes and lighter single-car doors. They are less expensive but wear out faster and can be more dangerous if they break without safety containment cables.

How Long Do Springs Last?

Garage door springs are rated by cycle count, not years. One cycle equals one full open-and-close. Standard springs are rated for 10,000 cycles, while high-cycle springs can handle20,000 to 50,000 cycles.

For the average household that opens and closes the garage door 4 times per day, that works out to:

• 10,000-cycle springs: approximately 7 years
• 20,000-cycle springs: approximately 14 years
• 50,000-cycle springs: approximately 34 years

We generally recommend 20,000-cycle springs as the best value for most homeowners. The cost difference between standard and high-cycle springs is relatively small — usually $50 to $100 more — but you double the lifespan.

Signs Your Spring Is Failing or Broken

These are the warning signs we hear about most from homeowners in our service area:

• A loud bang from the garage: This is the most common sign. A breaking torsion spring releases stored energy all at once, creating a sound like a gunshot or a car backfiring. Many homeowners think someone broke into their garage.
• The door will not open or barely lifts: Without spring counterbalance, the opener cannot lift the door. If you hit the button and the motor strains but the door only lifts a few inches, the spring is likely broken.
• A visible gap in the torsion spring: Look at the spring above your door. If you see a clear gap where the coils have separated, the spring is broken.
• The door falls fast when closing: A broken or weakened spring means the door has no counterbalance on the way down. The door drops rather than lowering smoothly.
• The door opens crooked: If one spring in a two-spring system breaks, one side lifts while the other does not, causing the door to tilt and bind in the tracks.

Why DIY Spring Replacement Is Dangerous

I cannot stress this enough: do not attempt to replace garage door springs yourself. Torsion springs are under extreme tension — a standard residential torsion spring stores enough energy to lift 150 or more pounds. When those springs or the winding cone slip, they can cause severe injury or death. This is not theoretical — fatalities from DIY spring replacement happen every year across the country.

The tools required — winding bars, vise grips rated for the torque, and proper knowledge of spring wire sizes (residential torsion springs use wire gauges from 0.207 inches to 0.283 inches depending on door weight and spring length) — are specialized. Professional technicians train specifically for this work.

Washington state requires licensed contractors for garage door spring work. This is not bureaucratic overhead — it is a safety regulation that exists because of real injuries.

What Does Spring Replacement Cost?

In the Puget Sound area, expect to pay:

• Single torsion spring replacement: $200 to $350 including parts and labor
• Pair of torsion springs: $350 to $500 including parts and labor
• Extension spring pair: $150 to $300 including parts and labor

We always recommend replacing both springs at the same time, even if only one is broken. If one spring has failed, the other is the same age and has the same wear — it is only a matter of time. Replacing both at once saves you a second service call and prevents uneven wear on your opener and tracks.

Emergency or after-hours service calls will run higher — typically a $50 to $100 premium. If you can safely leave the door closed and schedule a next-day appointment, you will save money.