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.
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.
Garage Door Repair Free Estimate Centennial 80015
Rolling sectional overhead garage door spring replacement should cost somewhere between $195 to $300 for a quality set springs (50000 cycle rating). This price will very if the garage door repair company charges a service call fee (trip charge). The most important thing to consider along with price is the quality of the springs and the warranty. There are any company that we use lower or mid quality springs and charge on the higher end because they include a lifetime warranty on the springs. The catch is that this warranty will only covers the spring for life and labor only for 30 days to a year. Look for a company that offers a equal parts and labor warranty. This insures that the warranty represents the rating of the springs that are being installed. For instants, you may buy a 1500 cycle rated spring set (last 3 years +or-) for $200 with a lifetime warranty and 1 year on labor. When a spring brakes after 3 year the spring its self is covered but the labor cost to replace the warranty spring can be between $65 to $100. This can add up over the year as the warranty will not restart at the time of the warranty replacement. On the offer hand, if you purchase a set of springs rated at 50000 cycles (last 10 year +or-) for $270 with a 10 year parts and labor warranty and a spring brakes in 8 years it would be replace at $0 cost. A must batter value! Always check service company review and get the details on the quality of springs a garage door repair company uses and the warranty, part and "labor". http://m.youtu.be/Z_eZc-kh40c
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.