Most Marin County homeowners ask the same first question when their automatic gate stops working: how much is this going to cost? The honest answer is that automatic gate repair pricing depends on what actually failed, the type of gate, the age of the operator, and whether parts are readily available. This guide walks through the real ranges we see on jobs across San Rafael, Mill Valley, Novato, and the rest of Marin County so you can budget realistically before you call.
Service Call & Diagnostic
Almost every repair starts with a diagnostic visit. A diagnostic includes a full inspection of the gate, operator, control board, safety devices, and access control. Some companies charge a flat trip fee; we provide free estimates throughout Marin County for most jobs and only quote work after we know what is actually wrong. Call (415) 942-6409 to schedule.
Photo-Eye / Safety Sensor Realignment
Photo-eye sensors are the most common reason a gate refuses to close. Misalignment from a bumped post, a spider web across the lens, or a corroded wire connection will all trigger the same symptom. Realignment, cleaning, and a wiring check is one of the least expensive repairs — often $150–$300 including parts.
Remote & Keypad Replacement
A new rolling-code remote is typically $40–$90 depending on the brand. A replacement weatherproof keypad runs $180–$400 installed, depending on whether the existing wiring is intact and whether the keypad is wired or wireless.
Control Board Replacement
When the brain of the operator fails — from a power surge, water intrusion, or simple age — the control board is replaced. Boards range from $350 to $900 for the part, plus install labor. We always try to repair before replacing, but a fried board is a fried board.
Capacitor / Motor Repair
Swing and sliding gate operators use start capacitors that fail with age. Capacitor replacement is one of the cheapest motor repairs ($150–$350). A full motor rebuild or replacement is a different conversation — generally $600–$1,800 depending on the model.
Battery Backup Replacement
PG&E PSPS outages have made battery backup essential in Marin. Replacement batteries run $90–$220 each; some operators use two. We recommend testing batteries annually.
Loop Detector & Free-Exit Loop Repair
If your free-exit loop or shadow loop has failed — gate stuck open, cars not detected — the repair is either the detector module ($200–$500) or a new loop cut into the pavement ($400–$900). We test before recommending the more invasive option.
Swing Arm / Hinge Repair
Bent swing arms, sagging hinges, snapped welds, and dragging gates are common after a vehicle hit or many years of cycling. Labor-heavy: $400–$1,500 depending on damage.
Sliding Gate Roller & V-Track Repair
Worn V-track wheels, broken chain, and bent track are typical sliding-gate failures. Roller assemblies run $250–$700; full track replacement is more involved.
Full Operator Replacement
When the operator is beyond economical repair — common for 15+ year old units or off-brand operators with no parts support — full replacement runs $1,800–$4,500 installed depending on swing vs slider, residential vs commercial duty, and accessories like battery backup and surge protection.
Why Prices Vary in Marin
Marin has unique conditions that affect repair cost: coastal salt air on Tiburon and Sausalito waterfront properties shortens hardware life; hillside driveways in Mill Valley and Fairfax often need larger operators; commercial gates in Novato see more cycles and need commercial-duty parts. A San Rafael flat-lot single swing gate is the simplest job; a Tiburon estate dual swing with intercom and battery backup is the most involved.
How To Keep Costs Down
Annual lubrication of hinges and rollers, sensor cleaning, and a battery test extend operator life dramatically. Most premature failures we see are from skipped maintenance, not bad equipment.
If your automatic gate isn't working, call Al's Automatic Gate at (415) 942-6409. We're open daily 7 AM – 8 PM, free estimates throughout Marin County, and we'll quote the exact repair before any work starts.