New Hampshire
House Bolting and Cripple Wall Bracing
Engineered or standard-plan bolting and cripple wall bracing to keep older raised-foundation homes on their foundations.
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.
Local conditions we plan for
- Deep frost penetration and frost heave
- Heavy snow loads
- Ledge (shallow bedrock) affecting excavation
- Riverine flooding and aging dams
Building code: 2021 IBC/IRC adopted at the state level (ICC adoption chart, April 2026). A town notice reports the state adopted the 2024 editions effective July 1, 2026.
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
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.
How do I verify an engineer's license in New Hampshire?
Engineers practicing in New Hampshire are licensed by the New Hampshire Board of Professional Engineers. You can confirm a license number and its status in the board's public license search before you sign a contract.
Which building code applies in New Hampshire?
2021 IBC/IRC adopted at the state level (ICC adoption chart, April 2026). A town notice reports the state adopted the 2024 editions effective July 1, 2026. Cities and counties can add local amendments, which is one reason to hire an engineer who works in your area.
What site problems do engineers see most in New Hampshire?
Common issues include deep frost penetration and frost heave, heavy snow loads, ledge (shallow bedrock) affecting excavation and riverine flooding and aging dams.