What it costs
These are ranges, not quotes. What a job actually costs depends on the size and weight of the door, which parts are already damaged, and whether getting to the fault means dismantling something else.
Get it looked at firstRanges are not quotesWhy nobody can price a spring over the phone
A torsion spring is specified by wire size, inside diameter, length and wind direction, and those have to match the door's weight. Quote a figure before seeing it and you are either guessing high to be safe or quoting for a spring that does not fit. Anyone naming a firm number sight unseen is doing one of those two things.
What a technician can tell you on the phone is what the visit costs and what the common outcomes run to. That is a reasonable thing to ask for.
What moves the number
One spring or two. Wide doors carry two, and replacing both is usually the economical choice even when one is intact, because the second has the same cycles on it.
Steel or wood. A wooden door on an older Manchester house is heavier, needs stronger springs, and is more awkward to work on.
What else went with it. A spring that broke under load often takes a cable with it; a door that came off its track in a hurry may have bent a panel. The second fault is frequently what decides the bill.
Corrosion. Fasteners and brackets that have spent a decade in salt do not always come apart cleanly, and that is time.
When you call. Evenings, weekends and the middle of a storm cost more than a Tuesday morning, everywhere.
The repairs people ask about
Broken spring
The most common repair and the one most worth doing properly. Price follows the door's weight and whether both springs are replaced.
Cable off or snapped
Often found alongside a spring failure rather than on its own.
Rollers and track
In a salted climate the bottom rollers and the lowest section of rail wear first and are usually replaced rather than cleaned up.
Opener gear
Less than a new opener on most units, provided the motor is sound.
Bottom seal
One of the cheapest parts on the door and the one that decides whether it freezes down in January.
Panel replacement
The expensive one, and usually the consequence of running the opener against a door that was stuck.
The cheapest money on the door
A seal before winter, oil on the springs in autumn, and salt rinsed off the bottom of the tracks in spring. None of it is a repair, and all of it postpones one.