House Bolting & Foundation Repair in Danville, CA

01At a glance

Danville homes at a glance

1980: Median year built
77.4%: Single-family detached homes
85.5%: Owner-occupied
43,302: Residents (2025 est.)

Housing figures: U.S. Census Bureau ACS 2020–2024; population: Vintage 2025 estimate (QuickFacts).

02Two eras

Raised foundation or slab? Check first

	Older homes (pre-1980)	Newer homes (1980+)
Typical foundation	Raised perimeter with crawlspace	Often slab-on-grade
Retrofit candidate?	Often: bolting and cripple-wall bracing	Rarely
Common foundation issues	Old posts and girders, unbolted sills	Slab cracks, settlement, drainage
Brace + Bolt	Possible, if selected	Not eligible (built 1980 or later)

A crawlspace vent along the base of the walls is a quick sign of a raised floor.

03House bolting

House bolting in Danville

"House bolting" means adding anchor bolts and plate washers that tie the sill plate to the foundation, usually with plywood bracing of the cripple walls. A bolt-only job typically runs $1,500–$3,500+ and a full bolt-and-brace retrofit $3,000–$7,000+ (customhome.us; CRMP). How a retrofit works →

04Permits

Danville permits vs the County

Inside town limits, permits and inspections go through the Town of Danville Permit Center. Unincorporated Alamo, Blackhawk and Diablo use Contra Costa County, and Blackhawk and Diablo homes may also need HOA approval.

05Nearby

Alamo, Blackhawk and Diablo

Alamo (1978 median build year) has many older large-lot homes; confirm ZIP 94507 with CRMP's Brace + Bolt lookup. Blackhawk (1988) is mostly newer construction where slab and drainage issues are more common than retrofits. Diablo is a small foothill community with a mix of ages.

06Brace + Bolt

Brace + Bolt in Danville

Danville ZIPs 94506 and 94526 were on the 2025 eligible list. The grant pays up to $3,000 toward the retrofit (CRMP). Checklist and how the draw works → For sloping floors in older Danville homes, see leveling and underpinning.

09Questions

Danville questions

Does my Danville house need bolting?

If it was built before 1980 on a raised foundation and you cannot see anchor bolts with square plate washers along the sill plate in the crawlspace, it is a candidate. Slab houses generally are not.

Who issues permits for Alamo or Blackhawk homes?

Contra Costa County, not the Town of Danville.

Sources · read October 4, 2026