Buildings & Structural
House Bolting and Cripple Wall Bracing
Engineered or standard-plan bolting and cripple wall bracing to keep older raised-foundation homes on their foundations. Typical US fees run $500 to $3,000, and most projects take 1 to 4 weeks for design. Our drawings, calculations and reports are sealed by a Professional Engineer (PE) licensed in the state where your project is located, ready for permit submission.

What the work involves
Older wood-frame homes on raised foundations can slide off or collapse at the cripple walls during earthquakes. A retrofit adds anchor bolts to connect the sill plate to the foundation and plywood bracing on cripple walls. Many homes qualify for prescriptive plans, such as California's FEMA P-1100 based standard plans; others need an engineer. California's Earthquake Brace + Bolt program offers grants up to $3,000 for eligible wood-framed, pre-1980 raised-foundation homes in qualifying ZIP codes, plus supplemental grants up to $7,000 for income-eligible households.
When you need it
- Wood-frame house built before 1980 on a raised foundation
- Tall cripple walls or hillside foundation
- Buying an older home in a seismic region
- Earthquake insurance discount or grant program
What you receive
- Evaluation
- Retrofit plan (standard or engineered)
- Permit support
- Final letter
What drives the cost
Estimate for engineering when standard plans do not apply; the Earthquake Brace + Bolt program reports typical contractor retrofit costs of about $3,000 to $7,000.
Frequently asked questions
How much does house Bolting and Cripple Wall Bracing cost?
Across the US, house Bolting and Cripple Wall Bracing usually costs $500 to $3,000. Estimate for engineering when standard plans do not apply; the Earthquake Brace + Bolt program reports typical contractor retrofit costs of about $3,000 to $7,000.
How long does house Bolting and Cripple Wall Bracing take?
Plan on 1 to 4 weeks for design from signed proposal to stamped deliverables, longer if a site visit, soil testing or a permit review cycle is involved.
Do I need a licensed PE for house Bolting and Cripple Wall Bracing?
In most US jurisdictions, yes. When the work needs a permit, the plans, calculations or report usually must be sealed by a Professional Engineer licensed in the state where the project is located. Every deliverable we issue for permit is sealed that way.
Will I also need a structural engineer?
Sometimes. Depending on the site, house Bolting and Cripple Wall Bracing can also involve a structural engineer or retrofit contractor. We tell you up front which other professionals your project needs and coordinate with them so the drawings agree.
Who do you provide house Bolting and Cripple Wall Bracing for?
Most of our clients for this service are homeowners and contractors. Describe your project and one of our engineers will reply with scope, fee and schedule.
Do I need an engineer for house bolting?
Many homes can use prescriptive standard plans. Engineering is needed for tall cripple walls, hillside homes or irregular foundations.
What is the Earthquake Brace + Bolt program?
A California program that has offered grants up to $3,000 toward code-compliant retrofits of eligible homes; check its site for current registration. Grants are limited and awarded in registration windows.
Can a retrofit lower earthquake insurance premiums?
The California Earthquake Authority offers premium discounts for qualifying retrofitted homes. Ask your insurer what documentation it needs.
Is a permit needed for a seismic retrofit?
Generally yes. Building departments issue permits for bolting and bracing, and an inspector verifies the work.