In most cases, only one spring breaks or wears out at a time, and you can get away with replacing just the failed spring. But this is a little like replacing old car tires one at a time. You'll get the best performance if all the springs are new and have the same strength. Extension springs are replaced individually, making it more tempting to replace just one. With torsion springs, you have to disassemble everything to replace either spring, so it makes sense to swap out both springs during the repair.
Garage door springs support most of the weight of the door when it's opening and closing. A broken spring typically will make the door very hard to lift, rather than causing the door to stick halfway. But some spring problems can contribute to a stuck door. The springs help turn metal wheels, called pulleys, that help lift the door via vertical cables at each side of the door. A pulley can become jammed by an obstruction or possibly a misaligned or hung-up cable. Any problems with springs or pulley should be examined by a garage door professional. Springs (and pulleys) are highly tensioned and can be very dangerous to work with.
If you need to leave the door open until you can make repairs, block the door track on both sides so the door can't move, and unplug the garage door opener (if you have one). If you want to close the door, you can try closing it with the opener, making sure there's nothing in the door's path in case something goes wrong. However, this will put some strain on the opener. Alternatively, you can have a few strong helpers hold the door while you disconnect it from the opener and carefully close the door manually—again, it will be very heavy.

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Install the stiffening strut on top of the top section of steel doors with the section lying flat. Then install the opener bracket that replaces the center bracket between the top two sections. While you’re working on the sections, protect them from scratches by putting carpet scraps on top of your sawhorses. Now, slide the rollers into the roller brackets.

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If your torsion spring isn’t lifting your door or your door is stuck, it is best to not attempt fixing it on your own. Garage doors are very heavy and can be the source of great injury if not handled with care when a part is broken. At Advanced Garage Door Solutions, Inc., we are there for you to quickly fix the problem so that normal garage door function is restored. To learn more, call the Minneapolis office at 952-500-3921 or the St. Paul office at 651-769-7191 and request a free estimate.

Guest 9232954 -- check out the other answers for this question, and the links below the answers for even more - seems from $125-400 range from different contributors (should be replaced in pairs for balanced lifting unless one spring is quite new), about $200-250 or 300 seems a common charge. The springs themselves generally run about $20-50 each depending on lead they have to carry.
9.8 Twist the garage door shaft to tighten the cable on the drum. While twisting, vise grip the shaft as shown to keep the cable tight on the drum. The top of the vise grip should be tight against the garage header. This will keep the cable snug on the first drum while you install the cable on the other drum and position it in place. It also keeps the shaft from turning and the cables peeling off when you wind the springs. That one grip can save many hours of walking back and forth and having to level and re-level the garage door after winding the torsion springs.
10The type of garage door shown provides the necessary lift assistance with a “torque tube.” If you intend to use an opener, wait to install the tube. Otherwise, install the torque tube according to the manufacturer’s directions. Roll up the door about 4 feet to check for the alignment of the tracks, and make any adjustments. Then tighten all fasteners.

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Over time, the springs in your garage door can wear down and break. While the average cost to repair garage door springs is between $100 and $200, in some cases you may need to replace them instead. Replacement can cost $20-$30 for springs plus labor which can cost up to $180. Here are some signs to watch out for when determining whether repair or replacement is the right course of action:
Sometimes, you’ll notice that your garage door closes all the way and then immediately goes back up instead of staying in the closed position. This issue usually arises with brand new garage doors that were just installed or older models that may need to be reset. If this happens, the most likely culprit is the open and close limit settings of your garage door opener.
The low rating on the CS is due to the fact that inwas out of town and my wife called because the garage door wouldn't open. We had repairs to the only other exit, and the CS said because it could be opened manually, it was no emergency. She was stuck in the house for over Sixteen hours. No emergency crew came out. Steve, a tech who came out the first time, fixed the door. It is not his fault CS took their sweet time to help a 45 year customer. I commend Steve. I do NOT have anything good to say about CS.
10.1 It is now time to wind the new springs, but before doing so, I recommend marking the shaft just beyond the winding cone. This is a final step taken to assure that you have installed the springs on the correct sides of the center bracket. Torsion springs always grow in length when they are wound in the proper direction. If your spring does not get longer as you wind it, you are winding it the wrong direction probably because it is improperly installed. We recurrently get calls about springs coming loose from the cones at about 6 turns. If this happens, switch the springs.
Home Depot local Service Providers are background checked, insured, licensed and/or registered. License or registration numbers held by or on behalf of Home Depot U.S.A., Inc. are available at homedepot.com/licensenumbers or at the Special Services Desk in The Home Depot store. State specific licensing information includes: AL 51289, 1924; AK 25084; AZ ROC252435, ROC092581; AR 228160518; CA 602331; CT HIC.533772; DC 420214000109, 410517000372; FL CRC046858, CGC1514813; GA RBCO005730, GCCO005540; HI CT-22120; ID RCE-19683; IA C091302; LA 43960, 557308, 883162; MD 85434, 42144; MA 112785, CS-107774; MI 2101089942, 2102119069; MN BC147263; MS 22222-MC; MT 37730; NE 26085; NV 38686; NJ 13VH09277500; NM 86302; NC 31521; ND 29073; OR 95843; The Home Depot U.S.A., Inc. is a Registered General Contractor in Rhode Island and its Registration Number is 9480; SC GLG110120; TN 47781; UT 286936-5501; VA 2705-068841; WA HOMED088RH; WV WV036104; WI 1046796.
	10.7 Continue tapping until the cone moves out to the mark on the shaft. Continue holding the bar off the garage door and pulling back toward the center of the door. If the cone slips away from the mark, repeat this step. Keep an eye on the tape to make sure the bar doesn't slip out of the cone. If it does start to slip, rest the bar against the top of the garage door, insert a bar in the next hole and turn the cone up enough to make it possible for you to push the marked bar back into place. 

You may remember a time as a kid when you and your siblings would close the garage door and run underneath it as fast as possible to make it out before the door closed. Well, on any garage door installed after 1993, that’s no longer possible thanks to two tiny photo eyes on either side of the garage entrance. These photo eyes transmit an invisible beam between each other that detects if anything is in the garage door’s path when it closes. This safety measure is there to prevent automatic garage doors from closing on top of someone or something and causing serious injury or damage to property.

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When a garage door service company gets a phone call in reference to a broken spring, the first thing the homeowner usually says is “the cables are broken”. This makes sense because the cables on a garage door will fly every which way, fall to the ground, become disconnected from the door, or even get caught in between the garage door and the jamb. It is rare for cables to break or need replacing when a garage door spring breaks. If your garage door has two torsion springs, the second spring will keep the cables tight and on the drums. You will have to look up at the springs to determine if one is broken.
We have had many concerns with our garage opener unit both safety issue and sleepless nights. At this time we are pleased that so far the unit is operating as it should.Hopefully we hope the issue of the unit opening by it self at early morning hours is solved. And if this is so, we want to Thank all involve in bring a satisfactory solution to this nightmare.

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One of the best ways to care for your springs is to check them over for wear. You can certainly look at them for damage, but sometimes the damage isn’t something that’s visible. In these cases, try lifting the garage door up from the ground. About halfway up, let go. If the door stays, the springs are still working perfectly. If the door sags or drops at all, this could be a sign that your springs are beginning to weaken and will need replacing soon.

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Garage doors cause injury and property damage (including expensive damage to the door itself) in several different ways. The most common causes of injury from garage door systems include falling doors, pinch points, improperly adjusted opener force settings and safety eyes, attempts at do-it-yourself repair without the proper knowledge or tools, and uncontrolled release of spring tension (on extension spring systems).
After removing the old batteries, make sure the plus and minus signs line up with the plus and minus signs on the inside of the transmitter. Otherwise, the new battery won’t work in the transmitter, and it could give you a false sign that something else may be wrong. Once the battery is in place, test the transmitter, and if it works, replace the transmitter door.
The winding and unwinding is done at a metal fitting, called a winding cone, attached to the outside end of the spring. You stick a winding bar into one of the four holes in the cone and use the bar as a lever to turn the cone. Once you've completed a quarter turn, insert the other bar into a different hole in the cone and let the bar lever against the closed garage door to hold the spring tension. This allows you to move the original bar to repeat the process, alternating the bars with each quarter-turn. It takes about 30 quarter-turns to fully tension a standard torsion spring.

Typically, it will cost less to install a steel garage door without an opener than to install a custom wood door with a garage door opener. Recent innovations have also yielded high-tech doors with thick insulation and energy-efficient glaze, as well as finished interior surfaces and other significant upgrades. These are more expensive doors, but they are also extremely durable.
Measure area labeled headroom (5), which is the distance between the top of the door opening (jamb header) and the ceiling (or floor joist). 10" is required for the standard extension spring or EZ-SET® Extension Spring System while 12" is required for a standard torsion spring and EZ-SET® Torsion Spring System. If you have restricted headroom, special hardware is available. Additional headroom is required for installation of an automatic garage door opener. NOTE: If garage door height extends above the opening, the headroom measurement should be adjusted proportionately.

The Leading (scam) in the industry is the "LIFETIME WARRANTY". It sounds great when presented and seems fair and maybe even a good idea even though the initial cost seems pretty high (on average 450 - 700 dollars) what is not mentioned is the annual required cost (known as the required or annual door maintenance) to keep the warranty valid which if a standard 15,000 cycle spring/s is used should average Ten years, this annual service is usually 90 - 120 dollars. That would be another "900 - 1200" dollars invested in Ten years, that and the initial cost and you could buy two or more "complete new" doors in that time.
When a spring breaks on a garage door an immense amount of energy being displaced. Torsion springs are mounted over the garage door and they have a shaft running through the middle. When they break, the spring unwinds in less than a second and creates a loud noise due to the coils spinning on the shaft. Based on customer feedback, it can be quite startling. http://m.youtube.com/watch?v=Z_eZc-kh40c
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