Garage Door Repair Services › Extension Spring Replacement
Extension Spring Replacement in Glendale, AZ
Extension springs run parallel to the horizontal tracks on each side of the door and stretch under tension to assist lifting. They're common on older single-car garages and lower-clearance installations. When one breaks, the door usually tilts or drops on that side, and the safety cable inside the spring becomes critical to preventing a dangerous projectile situation.
Glendale Garage Door Pros provides extension spring replacement for homeowners across Glendale, AZ. Call for a free inspection and a written quote before any work begins.
When to Call
When You Need Extension Spring Replacement
- One side of the door dropped suddenly and it now hangs at an angle
- You can see a stretched or snapped spring along the side track above
- Door pulls hard to one side when lifting manually
- A coil from a broken spring is hanging loose near the track
- Door has worked fine for years but suddenly sounds different and feels uneven
- Older single-car garage with original springs that have never been replaced
How It Works
Our Process for Extension Spring Replacement
- 1
Safety Check First
Extension springs store tension by stretching, and a broken one can whip. We check whether the safety cable inside the spring contained the break before approaching the track area.
- 2
Track and Pulley Assessment
Extension spring systems use pulleys and cables that wear independently of the spring. We check the pulley brackets, the S-hooks or bolts at attachment points, and cable condition before ordering the replacement.
- 3
Tension Release and Removal
We release door weight using clamps or a prop before removing the old spring. Extension springs can't be unwound like torsion springs — tension is released by supporting the door weight instead.
- 4
Spring Matching
Replacement springs are sized by stretch length and weight rating, not by appearance. We measure the door and existing spring to confirm the correct spec before installing.
- 5
Installation and Safety Cable
New spring goes in with the safety cable threaded through the center. That cable is not optional — it contains the spring if it breaks again. We install it correctly on both sides.
- 6
Balance Check and Cycle Test
We test the door manually for even lift on both sides, then run it with the opener and check that the door doesn't pull or bind at any point in the travel.
What's included
- Inspection of pulleys, S-hooks, and cable condition before starting
- Correctly rated replacement extension spring for the door's weight
- Safety cable installation or replacement inside the spring
- Removal and disposal of the broken spring
- Balance test to confirm even lift on both sides
- Opener cycle test and adjustment after replacement
What's not included
- Pulley or cable replacement if those components are also worn — quoted after inspection
- Conversion to a torsion spring system — that's a different service with different hardware
- Painting or refinishing of track hardware disturbed during the job
Real Situations
Common Scenarios in Glendale
A homeowner with an older single-car garage in the Historic Catlin Court area has a spring that broke and the loose coil is sitting on the track.
That's a sign the safety cable wasn't present or failed. We remove the loose spring carefully, install a properly rated replacement, and thread a new safety cable through it. We also check the opposite spring since both have likely been there the same amount of time.
A Glendale homeowner replaces one extension spring on their own but the door still tilts when it moves.
Tilting after a single spring replacement usually means the new spring rating doesn't match the existing spring on the other side. We measure both and replace the mismatched one so they pull evenly. Unmatched springs wear each other out faster.
A home inspector flags old extension springs without safety cables at a property sale in west Glendale.
Springs without safety cables are a real hazard. We replace both springs and install safety cables through each coil. We can provide documentation of the work completed if the buyer or seller needs it for the transaction.
Glendale Context
Why this matters in Glendale
Extension springs are still common in Glendale's older housing stock — particularly the smaller single-car garages built in the 1970s and early 1980s in neighborhoods near 43rd and 51st Avenues. Many of those original springs have never been replaced and are operating well past typical service life. Low-headroom garages in that era were almost always extension spring setups because there wasn't enough ceiling clearance for a torsion bar.
Straight Talk
About pricing & scope
Extension spring jobs vary based on spring length, weight rating, and whether the pulleys and cables also need attention. Both springs usually need replacement at the same time since they've aged together — doing only one leaves a mismatch that creates new problems quickly. We'll explain what we find and let you decide.
What This Fixes
Problems We See in Glendale
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