A spring swap looks simple from the driveway: out with the old, in with the new. The reality is a precise, high-tension job where measuring and balancing matter more than muscle. Here is the whole process, start to finish.
The job starts with measurement, not wrenching, and this is the part homeowners skip when they try it themselves. We confirm the door is fully closed so the spring is at rest, then read the spring to size its replacement. Four numbers decide everything: the wire diameter, the inside diameter of the coil, the overall length, and the wind direction, left or right.
Those numbers, weighed against the door height and actual weight, tell us the exact spring to install. A 16-foot insulated steel door in Brookfield needs far more spring than a 9-foot wood single on a Fowler Lake cottage. Get the wire size wrong by a fraction and the door slams shut or refuses to stay open. We carry a range of galvanized, oil-tempered springs on the truck so the right one is usually already with us.
With a broken spring, half the danger is already spent, but a partially intact spring still holds dangerous tension, so this step is all sequence. We secure the door so it cannot move, then use winding bars to unwind any remaining tension in controlled quarter-turns. The bars are the safety tool here: they give leverage and keep hands clear of the spring.
Once the tension is out, we loosen the set screws on the winding cone, slide the old spring off the torsion shaft, and inspect the parts the spring hides. We check the cables for fraying, the bearings on the shaft, the center bracket, and the drums. On older Waukesha doors, a snapped spring often comes with a worn cable or a tired bearing, and catching that now saves a callback. If a cable is going, we cover that in our cable guide and replace it while the door is apart.
The new spring slides onto the shaft, and from here the work is methodical and tension-aware. The steps run in this order.
The number of turns is not guesswork. A given spring on a given door height needs a specific count to match the door weight, and we wind to that count, then verify by feel. This is the moment the door goes from a dead weight to a balanced, easy-lifting door again.
Winding the spring is only half the job. The proof is in the balance, and we never skip it. We pull the red release cord to disconnect the opener, then lift the door by hand. A correctly balanced door floats: it moves with light pressure and stays put at any height you leave it, whether knee-high, waist-high, or fully open.
If the door drifts down, the spring needs a touch more winding; if it creeps up, a touch less. We adjust until it holds. This matters far beyond feel. A balanced door means the opener only nudges it rather than deadlifting it, which is what keeps openers, cables, and rollers from wearing out years early. A door that is left unbalanced after a cheap spring swap is the reason many openers die before their time.
Before we reconnect the opener and call it done, we test the safety reverse. We run the door down onto a board or a roll of paper towel, and a properly set door reverses the instant it touches resistance. We also check the photo-eye alignment, since a door that will not close is often a sensor knocked out of line rather than a spring fault. Then we cycle the door several times and listen.
Start to finish, a single torsion swap is 45 to 75 minutes, a matched pair about 90. On price, a single torsion spring usually runs $220 to $320 installed, a matched pair $320 to $420, and an extension swap $180 to $280, with the $89 diagnostic applied toward the repair. For the full Lake Country breakdown see our cost guide or the cost page. Ranges shift with door size and the parts a given door turns out to need.
A single torsion spring swap usually takes 45 to 75 minutes on site. A matched pair runs about 90 minutes. That includes measuring the old spring, winding the new one to the door weight, balancing the door, and testing the safety reverse. Older doors that need cable or roller work alongside the spring take a bit longer.
We measure four things: the wire diameter, the inside diameter of the coil, the overall length, and the wind direction. Those numbers, matched to your door weight and height, determine the exact spring. Guessing any one of them gives a door that slams shut or will not stay open, so precise measurement is the heart of the job.
A torsion spring stores enough energy to break a wrist when it releases. Technicians use proper winding bars, work in a controlled sequence, and know the failure modes. Most do-it-yourself spring injuries come from a winding bar slipping under load. The tools and the sequence are what make it routine for a pro and risky for a homeowner.
Always. After winding the new spring we disconnect the opener and lift the door by hand. A balanced door floats and stays put at any height. If it drifts up or down, we adjust the winding until it holds. A balanced door is what keeps the opener and cables from wearing out early.
A single torsion spring usually runs $220 to $320 installed, a matched pair $320 to $420, and an extension swap $180 to $280. The $89 diagnostic applies toward the repair. See the cost guide for the full Lake Country ranges.
We are a local Lake Country crew. We measure, install springs sized to your door weight, balance it by hand, and test the safety reverse before we leave. Most spring jobs finish in under 90 minutes. Call or text us, or send the details below for a same-day quote.
Last updated: May 29, 2026.
