Unlike torsion springs, replacing extension springs has long been given the "green light" for DIYers, primarily because you can complete the job without having to deal with spring tension. The general process is simple and safe: open the door to relieve the spring tension (and secure it open with C-clamps in the tracks); disconnect the spring from the track bracket and the spring pulley, and disconnect the safety cable from one end; install the new spring, reinstall the pulley, and reconnect the safety cable, and you're done.

High-Cycle Springs: For longer lasting performance, choose our 100,000* high-cycle springs that are now powder coated. These springs are larger in length and inside diameter, resist rust, last longer than traditional springs and are guaranteed for life. Great for larger families, multiple vehicles and where the garage door is used more like your front door.

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Because garage doors are large, heavy, and mildly complicated, most people who buy them take advantage of these services. But, if you’re pretty adept at DIY tasks, you can save some money and enjoy the satisfaction of doing the job of installing a sectional garage door yourself. (Sectional garage doors travel up and down on rollers that ride along tracks at each side of the garage doorway.)
It’s difficult to say how often the springs will need to be replaced since it’s different for everyone. It depends on how often you use your garage door, how cold and long your winters are, how well you maintain your springs and many other factors. The best rule of the thumb is to check your springs regularly for signs of wear and damage and to replace them when they begin to appear tired.

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If you are not sure if your door had the correct springs, we recommend that you weigh your door using an analog scale. From my own field experience I would estimate that at least 10% of the doors have the incorrect springs on them. In addition to this, most manufacturers spring their doors using a 20 pound window. We like to improve the garage door balance. 

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On one-piece doors with side springs, you open the door to relieve the spring tension, and simply swap out the springs on the opener-arm mechanism; there are no cables or pulleys to deal with, and the springs have internal safety rods. Some doors have tensioners that maintain moderate tension when the door is open all the way, and on these you'll have to loosen the tensioner in order to remove the spring. https://www.youtube.com/embed/Z_eZc-kh40c

I had two extension springs replaced, all for $135.00 (this included tax). The work took about 35 minutes and I was relieved to have this taken care of. You never realize the importance of something to you, until it is broken. Was this a good price? Seemed reasonable enough and the repairman came out the same day I called. Harris County Houston, Tx.
The spring system opens and supports the garage door. These springs are under heavy force, which allows the door to bounce back open and avoids overburdening the garage door opener with the entire weight load. If these springs are stuck or broken, the whole system is affected. Start by lubricating the springs with non-silicon-based lubricant. If this fails, disconnect the garage door opener from the garage door to manually open the door. If you experience significant resistance, the springs might need to be replaced; a job that requires a professional.
Test the door balance. A garage door should require only a few pounds of pressure to move it up and down. If springs wear out and lose their resiliency, a power garage door opener may need to work extra hard to lift the door. This can quickly wear out the motor on the opener. Replacing worn-out springs is usually a job for a professional technician.
A garage door that has a broken spring has nothing to support its weight. The size of the door and the type of spring system determines how difficult opening the door will be. A garage door should not be opened until the spring is repaired. However, when you need to get your car out of the garage, it may be necessary if you cannot wait for the repairman. Use extreme care when opening a garage door in this manner. http://www.youtube.com/watch?v=Z_eZc-kh40c&feature=youtube_gdata
Your springs may be broken. There are two different types of springs. If your garage door springs are located horizontally at the top of your garage door then it is called a torsion spring. You should check for a gap in between the springs to indicate if they are broken. If your springs are located at either side of your garage door, they are called extension springs. Look to see if a piece of them is hanging on the side of your garage door to indicate if those are broken. If your garage door springs are broken then replacing them is a dangerous process if you have never done it before so you should seek a professional to repair or replace them.
Align the upper roller tracks by carefully lifting the door halfway. Lock it in place with two locking pliers, and install the supporting brackets on the back of the rails using 1-1/4 in. perforated angle iron (available at home centers and hardware stores). Install 1-1/2 x 1/4 in. stop bolts, with the threads to the inside of the track, at the end of each upper track.
If you use the correct tools and follow our instructions, you can rebuild the entire torsion spring system in just a few hours, without any side trips to the ER. We won't cover how to replace garage door extension spring systems in this story. But we'll show you garage door spring replacement on the more common torsion springs, the kind that mount on a bar above the garage door.
If your door feels heavy, it is likely that your springs have started to wear down and are no longer capable of bearing the weight that they once did. Now, don’t worry, just because a spring is starting to lose its strength doesn’t mean it will snap at any moment. However, simultaneously, a weak spring isn’t any safer to try and repair on your own.
Traditional One Panel: These doors consist of one large panel which tilts to open by employing a spring mechanism to swing upward. The wood version is popular in the South and Southeastern US, where a milder climate keeps the wood from rapidly deteriorating. Traditional garage door designs include Cape, Colonial, Ranch, Tudor and Craftsman. The disadvantage is these doors require a lot of clearance to operate correctly. Sometimes repairs can be difficult because of the heaviness of the door or its inaccessibility. Average cost to repair tilt-up doors is $172.
If you have a single-car garage, an extension spring will do the job. If you’re looking for a smoother motion and an ability to lift heavier doors, you may be better off selecting the torsion spring option. And if you have a two-car garage, your door will likely be too heavy for an extension spring. In this case, the torsion spring is the better choice.

If your garage door is not opening or has become jammed, you may need to replace the garage door cables. Unless you have the proper tools and know-how, this is a job best left to a professional due to the weight of the garage door and the extreme tension of the springs. The cost of repair will vary depending on your location, the length of the cables you need, and the time it takes the pro to do the replacement.
A new garage door can add serious curb appeal, not to mention myriad home safety benefits. The cost of a new garage door will vary based on the type of garage door you want and the materials it will be made of. You can purchase a new garage door and have the pros install it for you, but proceed with caution as many installers won’t guarantee their labor if you didn’t purchase the garage door through their company. A new door (without installation) may cost anywhere from $200 to $4,000 or more, depending on size, brand and materials. Here are some examples of average new garage door costs, including installation:  
• Extension springs: Garage door extension springs stretch to provide lifting power for the door. These springs are typically made of steel and mounted above the horizontal track of the garage door. A safety cable should run through your extension springs to prevent possible injuries or property damage. Extension springs are the most common type of garage door spring for residential use and can break after excessive usage.
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