Garage Door Springs in Mill Valley: Torsion vs. Extension Explained
2026-07-17 7 min read
If you've ever dealt with a stuck garage door, you know how frustrating it is when springs fail. The good news: understanding the two main spring types helps you avoid costly mistakes and get faster repairs. Most homes in Mill Valley use either torsion or extension springs, and knowing which one you have is half the battle when something goes wrong.
What Are Garage Door Springs?
Springs are the unsung heroes of your garage door system. They counterbalance your door's weight, making it light enough for the opener to lift and lower safely. Without them, your garage door opener would burn out trying to move 300 to 400 pounds of material. Springs typically last 7 to 9 years, depending on use and climate. Our foggy Mill Valley weather accelerates rust and wear, so regular inspection matters.
Your springs work constantly. Every open and close cycle puts stress on them. After thousands of cycles, metal fatigue sets in. That's why snapped springs happen without warning. One day your door works fine; the next, it won't budge.
Torsion Springs: The Standard Choice
Torsion springs are mounted horizontally above your garage door opening. They twist and unwind as your door moves, storing and releasing energy. This design is precise, balanced, and efficient.
Most residential garage doors in Mill Valley rely on torsion springs. They're safer than extension springs because they're contained within a metal shaft. If one breaks, the door won't come crashing down. Torsion springs also last longer and handle heavier doors better.
The downside? Replacement requires specialized tools and expertise. You'll need a professional to safely remove, measure, and install new torsion springs. DIY attempts can cause serious injury. A single torsion spring costs between $150 and $300, plus labor. Our team at Garage Door Company Mill Valley handles torsion replacements on the same day you call, most weeks.
Why Torsion Springs Fail
Metal fatigue is the main culprit. The constant twisting and untwisting weakens the coil over time. Rust, temperature swings, and improper door balance accelerate failure. If your door is misaligned or the springs carry uneven load, one spring may fail while its partner survives longer.
Extension Springs: The Budget Alternative
Extension springs run horizontally along each side of your door opening. They stretch and contract as the door moves, storing energy like a rubber band. You'll find them on lighter doors, single-car garages, and older installations.
Extension springs cost less upfront than torsion systems. They're easier to replace, and the parts themselves run $80 to $150 per spring. However, they're less durable and more prone to snapping. When an extension spring fails, your door can drop suddenly, which is why safety cables are essential.
Extension springs also require more frequent adjustment as they stretch over time. In Mill Valley's humid climate, rust develops faster on these exposed springs. Many homeowners eventually upgrade to torsion springs for better longevity and safety.
**Need garage door springs in Mill Valley today?** Call 510-738-0812. We cover same-day service across the area.
Which Type Do You Have?
Look above your garage door opening. If you see a horizontal spring wound tightly around a metal shaft, you have torsion springs. If you see two springs running along the sides, one above each track, you have extension springs. Take a photo and send it our way if you're unsure.
Don't guess. Ordering the wrong spring wastes time and money. The spring size, wire gauge, and wind direction must match exactly. An incorrect installation puts your door, your car, and your family at risk.
When to Repair vs. Replace
A single snapped spring can be replaced individually on most systems. However, if one spring failed, the other is likely close behind. Springs wear evenly under normal conditions. We often recommend replacing both springs at once, even if only one snapped. This keeps your door balanced and prevents a second failure weeks later.
Our detailed guide on garage door springs in Mill Valley explains repair versus replacement decisions in greater depth.
If your door is more than 10 years old or has original springs, a full replacement is often smarter than patching one spring. New springs come with a warranty and restore your door's performance. The cost estimate varies by spring type and door weight, but we'll provide exact pricing after inspection.
Getting a Same-Day Estimate
Spring issues don't wait. A stuck door blocks your driveway and leaves your garage vulnerable. We offer free estimates and can usually complete repairs the same day you call.
Contact us to schedule a free quote or call 510-738-0812. We'll identify your spring type, measure the load, and give you honest pricing. Most spring replacements take under two hours, and we handle cleanup.
If both springs are snapped, check out our post on what to do when garage door springs snap in Mill Valley for emergency steps.
Preventing Spring Failure
Regular maintenance catches problems early. An annual tune-up includes spring inspection, lubrication, and balance checks. We spot rust, cracks, and wear before catastrophic failure occurs. Our maintenance checklist guide outlines what we look for.
Keep springs dry and clean. Wipe debris from the shaft and tracks. Avoid harsh chemicals. If you notice your door opening unevenly or moving slower than usual, springs may be weakening. Don't wait for them to snap. Call us for an inspection.
Springs are the backbone of your garage door system. Whether you have torsion or extension springs, understanding how they work helps you make smart repair decisions. Mill Valley homeowners trust Garage Door Company Mill Valley to handle spring replacements quickly and safely. We're here when you need us most.
Frequently Asked Questions
How long do garage door springs last? Most springs last 7 to 9 years with normal use. Factors like climate, door weight, and maintenance affect lifespan. Mill Valley's fog and moisture can shorten this window by a year or two due to rust.
Can I replace a garage door spring myself? Torsion spring replacement is dangerous without proper tools and training. The wound spring stores immense energy and can cause serious injury if mishandled. Extension springs are slightly safer, but professional replacement is always recommended.
What does a garage door spring replacement cost? A single torsion spring replacement runs $200 to $500 total, including labor. Extension springs cost $150 to $350. We provide free estimates with no obligation before work begins.
Why did my garage door spring snap without warning? Springs fail due to metal fatigue accumulated over thousands of cycles. Rust, temperature changes, and uneven door balance accelerate wear. One day the metal simply can't handle the stress anymore.
Should I replace both springs if only one snapped? Yes, in most cases. Springs wear evenly, so the other is likely near failure too. Replacing both ensures balanced performance and prevents a second breakdown shortly after.