We are Family owned and operated proudly serving San Francisco & the Peninsula since 1980. Our expert technicians service, repair & install residential garage doors, gates & garage door openers, replacing torsion springs.

We service Burlingame, San Mateo, Redwood City, San Francisco, Hillsborough, Atherton, Woodside, Millbrae, San Bruno, South San Francisco, Half Moon Bay.

Because of our commitment to quality and professionalism, Alert Door has been recognized for providing exceptional installation services. We understand that installing a new garage door is an important investment and you can be assured that your complete satisfaction is our number on priority. We specialize in Garage Doors Installation of automatic gates, Garage Doors, Iron Gates, Automatic Gates, Dock Levelers, Gates, Security Grilles, Steel Rolling Doors and Overhead Sectional Doors, Rolling Service Doors, Overhead Sectional Doors, Residential Garage Doors, Hollow Metal Doors, Fire Doors, Rated Counter Doors, Counter Doors, Aluminum Grille Doors, High Speed Doors, and Mini Storage Sheet Doors.

We also service, repair & install commercial doors, gates, dock levelers, phone entry systems & motor operators.

24 hour emergency service is available.

We work with both commercial and residential customers on projects of all sizes for garage door contractor needs as well.