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Earthquake Retrofits
For single-family & duplex properties
For other properties, see Start Your Project
Updated: 03/23/2026
Earthquake retrofits entail bracing and bolting a home to its foundation. This project requires a building permit. To obtain the permit, you will either:
- Participate in the Earthquake Brace & Bolt Grant Program, using a state-certified contractor and a state-approved plan set. For this program, an easy online permit is available.
OR
- Independently apply for a building permit by submitting an earthquake retrofit plan.
Select the instructions that fit your project:
How to Apply - Independent retrofit projects only
Use the fast, lower-cost Over the Counter Service if the project qualifies and you are using the Standard Plan Set A. Otherwise, use Standard Plan Review.
Inspections
You will be issued a Permit Card that lists required inspections. Schedule inspections at SJPermits.org or call 408-535-3555 for assistance.
Be ready — read Inspection Success.
- The Permit Card must always be on-site and available to the Inspector.
- Have building plans and manufacturer instructions, if any, available to the Inspector.
- Ensure there is access to all areas of the project work; provide a ladder if one is needed.
Questions?
We are here to help — visit, call, or email us. See Contacts sidebar.
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Learn more about earthquake retrofits
Understand the risk
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Probability of a major earthquakeEarthquakes are common in California. In the Bay Area, the probability of a major earthquake occurring with a magnitude greater than 6.7 between 2014 and 2043 is high — about 72%. Source: Metropolitan Transportation Commission (MTC) data visualization.
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What can happen to a home during an earthquakeOn houses that are not bolted down, the lower cripple walls may buckle and collapse. The house can slide off the foundation or even overturn. Older wood-framed homes that are not built to modern-day earthquake standards are particularly at risk. |
Understand how a retrofit helps
Foundation components
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Strengthen the cripple wallsA key area to strengthen are the cripple walls. Strengthening includes:
Transfer the earthquake force into the groundSee the schematic below for how the force moves through the elements of the retrofit and ultimately into the ground. |
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See also: Strengthening Your Home Against Potential Earthquake Damage
Other items need attention, too!
Earthquake damage can also be caused by large, unsecured items. Go through your home to check that these items are all bolted to walls or otherwise secured:
- Appliances
- Chimneys
- Furniture
- Lighting fixtures
- Wall hangings
- Water heaters - California law requires that they are braced and strapped; see Water Heaters.
