Extension Spring
Replacement in Renton, WA
If you noticed a spring hanging loose along the track or heard a sharp snap from the garage, you likely have a broken extension spring. We have replaced thousands across the Greater Seattle area since 2012, with same-day service and parts always on the truck.
What Happens When an Extension Spring Breaks
Extension springs do the heavy lifting on many single-car garage doors across Renton and the Seattle area. They run along the horizontal tracks on both sides of the door, stretching and contracting every time you open or close it. When one snaps, you will usually hear a loud bang, see the spring hanging loose, or find that the door will not stay open or feels much heavier than normal. A broken extension spring is not just an inconvenience. Without safety cables, the broken pieces can fly across the garage. Our technicians carry all common extension spring sizes on the truck, so we can replace yours the same day you call.
How Extension Springs Work
A simple mechanism that does serious work every day.
Mounted Along the Tracks
Extension springs are installed on each side of the garage door, running parallel to the horizontal tracks. One end connects to the track bracket, the other to the door via a pulley and cable system. Extension springs are color-coded by the weight they are rated to lift, and they come in different lengths for 7-foot and 8-foot doors. We match both to your door so it lifts evenly and stays balanced.
Stretch When the Door Closes
As the door closes, the springs stretch and store energy. A standard extension spring can stretch to nearly double its resting length. This stored tension is what makes the door easy to open again.
Contract to Lift the Door
When you open the door, the springs contract and release that stored energy, pulling the door upward through the cable and pulley system. This counterbalances the weight of the door so the opener does not have to do all the work.
Safety Cables Are Essential
A steel safety cable runs through the center of each extension spring. If the spring breaks, the cable contains the pieces and prevents them from becoming projectiles. Every extension spring installation should include safety cables.
Extension Springs vs Torsion Springs
Understanding the differences helps you make the right choice for your garage door.
Warning Signs of a Failing Extension Spring
Catch these early and you can avoid a sudden breakdown.
Stretched or Elongated Spring
If a spring looks longer than usual or the coils are more widely spaced compared to the other side, it is wearing out and losing tension.
Door Closes Too Fast
A weak or broken spring cannot control the door weight. If your door drops quickly or slams shut, the springs are not doing their job.
Gaps Visible in the Coils
You can see daylight between the coils when the door is closed. This means the spring has broken or separated and needs immediate replacement.
Uneven Door Movement
The door tilts to one side when opening or closing. One spring has failed or weakened more than the other, causing unbalanced lifting.
Extension Spring Broken? We Can Fix It Today.
Same-day replacement across Renton and the Greater Seattle area. Parts on the truck, clear pricing before we start.
Why Safety Cables Matter
Extension springs are under significant tension. When one breaks without a safety cable, the pieces can fly across the garage at high speed. This can dent cars, break windows, or injure anyone nearby.
A safety cable is a steel wire that runs through the center of each spring and anchors to the wall or track bracket on both ends. If the spring snaps, the cable catches the pieces and keeps them in place.
If your extension springs do not have safety cables, do not wait for a spring to break. We install safety cables on every extension spring replacement, and we can add them to existing springs during a service visit.
How We Replace Extension Springs
A straightforward process, done right the first time.
Inspect
We check both springs, cables, pulleys, and track hardware. We identify the spring size and weight rating your door needs, then give you a clear quote before doing any work.
Replace
We remove the old springs, install new ones matched to your door weight, and run safety cables through each spring. We always recommend replacing both springs at once for balanced operation.
Test
We balance the door, test it manually and with the opener, lubricate all moving parts, and run a full safety check. You see the door working properly before we leave.
Why Renton Homeowners Choose Instant Garage Doors
Highest-rated on Yelp, 5.0 stars since 2012. Local family-owned business in Renton.
Licensed, bonded and insured. Cont. Lic. #IGDCOCL880NW.
All common parts on every truck. Most repairs done in a single visit.
We show you the condition before recommending. Clear quote before work begins.
Where We Work
We have a technician working near you. From Everett to Tacoma, across the greater Seattle area.
Don't see your city? Call us at (425) 533-0350, we likely cover your area.
What Homeowners Say About Extension Spring Service
Replaced spring and all rollers. Did a great job. Grant, the technician was friendly, knowledgeable and on-time. Phone scheduler did a great job, too. Can recommend!
See it on GoogleIGD was great to work with! They answered my call quickly, their estimate for repair was accurate. Wesley texted me before the appointment, he arrived on time, was courteous and helpful, and did a great job replacing springs and aligning the garage door.
See it on GoogleMy garage was hit by a car which messed up the spring and balance of the door. This resulted in my door not being able to close fully. I reached out to Instant Garage Door Repair via Yelp to determine if they could come take a look and found them to be extremely responsive. The repairman that came out was Wesley. Upon inspection, he was able to quickly determine the issues of the door and gave detail solutions and recommendations to get it fixed. We were able to then schedule a day for him to come out. When he came out, he brought all necessary tools and door parts and had my door working again within an hour. He reviewed with me all of the work he had completed and made sure everything worked and that I was satisfied with what had been completed. I appreciate the customer service and professionalism Wesley displayed and I would definitely recommend Instant Garage Door Repair to anyone experiencing garage door issues.
See it on GoogleOn Yelp
Frequently Asked Questions
Extension springs look simple but they do serious work. If yours broke or looks worn, here is what you need to know before calling.
01 What is a garage door extension spring?
An extension spring is a long, coiled spring that runs along the horizontal track on each side of your garage door. When the door closes, the springs stretch. When it opens, the springs contract and help pull the door upward. Most single-car garage doors use extension springs.
02 How is an extension spring different from a torsion spring?
Extension springs mount along the tracks on each side of the door and work by stretching. Torsion springs mount on a shaft above the door opening and work by twisting. Torsion springs last longer and offer smoother operation, but extension springs cost less and are common on lighter, single-car doors.
03 Do I need safety cables on my extension springs?
Yes. Safety cables run through the center of each extension spring. If a spring breaks, the cable keeps the pieces from flying across the garage. If your extension springs do not have safety cables, we strongly recommend adding them during any service visit.
04 Can I convert my extension springs to torsion springs?
In most cases, yes. Converting to torsion springs gives you smoother operation, better balance, and the option of high-cycle springs that last much longer. The conversion requires new hardware above the door. We can evaluate your setup and give you a clear quote for the upgrade. A conversion includes torsion springs sized to your door, a steel torsion shaft, center and end bearing plates, cable drums and lift cables.
05 How long do extension springs last?
Standard extension springs are rated for 10,000 to 15,000 cycles, which works out to roughly 7 to 10 years with typical daily use. Factors like door weight, climate, and maintenance affect how long they hold up. If you want springs that last significantly longer, we can convert your door to high-cycle torsion springs.
06 Should I replace both extension springs at the same time?
Yes. If one spring broke, the other has the same age and wear. Replacing both at once keeps the door balanced, prevents a second failure shortly after the first, and saves you from paying for a second service call.
07 How much does extension spring replacement cost?
Extension spring replacement typically costs between $150 and $300 for a pair, depending on door size and spring type. We provide a clear quote before starting any work. There are no hidden fees or surprise charges.
Get Your Extension Springs Replaced Today
Licensed, insured, and family-owned in Renton since 2012. Same-day service with upfront pricing.