Garage Door Spring Repair in St. Louis, MO

The bang you heard

Homeowners describe it the same way every time: a gunshot, a car backfiring, something falling off a shelf. People check the street. Then, hours or days later, they hit the remote and the opener runs, the trolley slides down the rail, and the door doesn’t move an inch.

That sound is stored energy releasing. A torsion spring on a double door holds enough wound torque to counterbalance 150 to 200 pounds. When the steel finally fatigues and the coil separates, all of that unwinds in a fraction of a second inside a metal tube — hence the noise. Go look at the shaft above the door. If you see a clean two-inch gap in what should be a continuous coil, that’s your answer, and no amount of remote-pressing is going to change it.

Stop using the opener now. The motor is designed to guide a door the springs have already made nearly weightless — it is not a hoist. Force it against dead weight and you will strip the nylon drive gear, bend the top section where the opener arm mounts, or pull the door out of the track. That’s a $260 spring job becoming a $900 afternoon. Don’t try to muscle the door up by hand either; a door with one broken spring lifts unevenly and can slam back down.

Torsion vs. extension: which system do you have?

Torsion springs mount on a steel shaft directly above the door opening, usually one or two of them, wound tight and anchored to a center bearing plate. Cables run from drums at each end of that shaft down to the bottom brackets. This is the modern standard, it’s better balanced, and it lasts longer. Nearly every door built in the last 30 years uses it.

Extension springs run horizontally along each side, parallel to the upper tracks, and stretch as the door closes. They’re cheaper, they were standard on lighter single doors for decades, and you still find them everywhere in the older housing stock — the detached, unheated one-car garages behind homes in South City, Lemay, Overland, Bevo Mill and Ferguson.

Here’s the part that matters. An extension spring system is supposed to have a safety containment cable threaded through the middle of each spring and anchored at both ends. Its only job is to catch the spring if it breaks, so the broken half doesn’t become a projectile across the garage. On older doors around St. Louis those cables are missing constantly — never installed, or removed during some past repair and never put back. If you have extension springs and you can’t see a cable running through the center of each one, that’s not a maintenance suggestion. Have it addressed. Containment cable is inexpensive and we install it as part of any extension spring service.

Why we always replace springs in pairs

Because they are the same age and have done the same work. On a two-spring door, both were installed on the same day and have gone through an identical number of cycles. When one breaks, the other is not “fine” — it is simply the one that hasn’t failed yet, and it is typically weeks or months behind.

Replacing a single spring means paying a second diagnostic call and a second labor charge, usually within a year, and running an unbalanced door in the meantime. It also leaves you with mismatched torque, which drags the door on one side and accelerates wear on cables, drums and the opener. Doing the pair while the technician is already on the ladder costs a fraction of two visits. We quote pairs by default and we’ll explain exactly why on site.

Cycle ratings: the number nobody tells you about

Springs aren’t rated in years. They’re rated in cycles — one cycle is one full open and one full close.

• 10,000-cycle (builder grade). What comes on most new construction. At four cycles a day — leave for work, come home, run an errand, come back — that is roughly seven years.
• 25,000-cycle (high cycle). Heavier-gauge wire, larger inside diameter, more coils. Roughly double the service life at the same usage, for an upgrade cost of about $70–$130 on the job.
• 50,000-cycle and up. Worth discussing if your garage is the primary entrance to the house and the door runs eight or ten times a day, or on a commercial opening.

This is the single explanation for a pattern we see constantly in St. Charles County. Subdivisions in Wentzville, Cottleville, Lake St. Louis, O’Fallon and Dardenne Prairie went up in tight build windows — a whole street finished in the same eighteen months, every house with the same 16'x7' or 18'x8' double door on the same builder-grade springs. Seven years later they start failing as a cohort. We’ll do three spring jobs on one street in a month and the neighbors compare notes. If your subdivision is around that age and your neighbor just had a spring go, get yours looked at. Our tune-up service measures remaining balance and tells you honestly where you stand.

Why DIY spring work is genuinely dangerous

We say “don’t do this yourself” about almost nothing else on this website. Rollers, lubrication, sensor alignment, tightening hardware — reasonable homeowner jobs. Torsion springs are different, and it isn’t liability boilerplate.

A wound torsion spring stores several hundred foot-pounds of energy. It is released and re-applied with two steel winding bars inserted into the cone, a quarter turn at a time, while you hold the entire load on your arms above your head. If a bar slips out of the cone — because it’s the wrong diameter, because a set screw wasn’t backed off correctly, because the cone is worn — the spring unwinds instantly and the bar becomes a two-foot steel projectile at head height. Emergency rooms see the results: broken hands and wrists, facial fractures, lost fingers, worse. Screwdrivers and rebar are not winding bars, and the hardware store sells neither the right bars nor the right spring for your door’s weight, drum size and drop.

The second problem is that the wrong spring is almost as bad as no spring. Springs are matched to the door’s weight, height and drum. A spring that’s over-strength makes the door fly up and slam; one that’s under-strength makes the opener carry the difference until the gear fails. Getting it right requires weighing or calculating the door and reading the wire size, inside diameter and length off the existing spring. That’s what you’re paying a technician for.

What the repair visit looks like

• Two-hour arrival window, technician texted to you with his name and photo. Most St. Louis City and County spring calls are same day.
• He secures the door, measures wire size, inside diameter, overall length and wind direction, and weighs or calculates the door to confirm the correct spring.
• You get a written flat-rate price with the standard and high-cycle options side by side, before anything is unwound.
• New matched springs installed with proper winding bars, plus new center and end bearings if the old ones are dry or scored, and cones set to spec.
• Lift cables inspected at the drums and bottom brackets — the cables and the springs age together, so if the cable strands are frayed we’ll show you and price cable replacement now rather than have you call back in three months.
• Full hand balance: opener disconnected, door should hold at waist height and at shoulder height with no drift.
• Opener reconnected, travel and force limits reset for the newly balanced door, auto-reverse safety tested, everything lubricated.
• Written parts and labor warranty on the invoice. Typical job time is 60 to 90 minutes.

What spring replacement costs in St. Louis

Prices are typical St. Louis-area ranges as of 2026 and vary by door size, spring cycle rating, hardware condition and access. Your exact price is quoted in writing before any work begins. Same flat rate in every ZIP code — see our pricing page.

We replace springs across the whole metro, from the century-old detached garages of South City to the newest builds in Wentzville and St. Charles, plus Kirkwood, Chesterfield, Florissant and Fenton. If the spring broke after hours with a car trapped inside, we run 24/7 emergency service. And if the door came off the track when the spring let go, see off-track repair.