Welcome to Cal-Quake Construction

San Francisco Retroftting – A CalQuake Inc., company are earthquake readiness experts. Here you will find useful information on earthquake retrofitting for your property, such as home bolting, shear paneling and soft story conditions.


Servicing Northern California including San Francisco, Piedmont, Santa Cruz, Hillsborough, Marin County, San Jose.  We have the experience needed to help protect and mitigate earthquake damage to your property.  House (anchor) bolting using (UFP plates), framing anchors and securing post and pier connections are just a small part of what we do to retrofit your home.

Our decades of experience and customer service makes us a leader in the EQ retrofit industry.  We partnered with the Structural Engineers Association (SEA). The (SEA) had been commissioned by the City of Los Angeles to create standards for retrofitting. Since that time, CAL-QUAKE Construction, Inc. has retrofitted and/or done correctional foundation work on over 10,000 properties throughout California.

Our Services

Foundation Repair

During the inspection, the property and it’s surroundings are inspected for conditions that indicate prior or future seismic and/or foundation concerns.  more

Retrofit Certifications Inspections

Cal-Quake will inspect your property to make sure it is up to current city code.  If it is, we will issue a Retrofit Certification within 24 hours of inspection.   more

Home Bolting

Cal-Quake Construction is a retrofitting contractor who specializes in foundations and structural strengthening. more

Soft Story Repair

Soft Story – Many properties, residential, commercial and apartment buildings have what is called a “soft story” condition. more

What is earthquake retrofitting?

Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. With better understanding of seismic demand on structures and with our recent experiences with large earthquakes near urban centers, the need of seismic retrofitting is well acknowledged. Prior to the introduction of modern seismic codes in the late 1960s for developed countries (US, Japan etc.) and late 1970s for many other parts of the world (Turkey, China etc.),[1] many structures were designed without adequate detailing and reinforcement for seismic protection. In view of the imminent problem, various research work has been carried out. State-of-the-art technical guidelines for seismic assessment, retrofit and rehabilitation have been published around the world – such as the ASCE-SEI 41.