How much does it cost to replace extension springs?

Replacing extension springs typically costs 150 to 300 dollars when done by a professional, with most service calls running 200 to 250 dollars for a standard pair. Parts alone are inexpensive, around 20 to 60 dollars per spring, with labor and the service call making up the rest. Pros almost always replace both springs and the safety cables that run through them at the same time, since both wear together and the cables prevent broken springs from flying. DIY replacement runs 40 to 120 dollars in parts. Pricing rises if the door also needs new pulleys, rollers, or cable drums, or if the technician converts the door from extension to torsion springs, which costs 300 to 600 dollars total.