The same postwar building boom that shaped Cupertino also built most of Sunnyvale - and a large share of the city's concrete flatwork is original to homes that went up between 1950 and the early 1980s. That means driveways, walkways, and patios that are now 40 to 60 years old, sitting on clay-heavy soils that have been expanding and contracting with every wet and dry season for decades. The USGS has documented the Santa Clara Valley's clay soil movement as a persistent driver of surface settlement and cracking, and homeowners in Sunnyvale see it play out on their concrete year after year.

Sunnyvale's housing mix adds a complicating factor that doesn't apply everywhere. The city has a significant and growing inventory of attached townhomes and condos near the Caltrain station and along El Camino Real, and those properties often have HOA requirements that govern what exterior work is permitted, what materials are allowed, and what approval process must be followed before a project can begin. Sunnyvale also enforces permit requirements for concrete work that touches the public right-of-way or involves a new or modified driveway approach. Contractors who don't know the city's permit process add weeks of delays and risk that the finished work doesn't meet city standards - both of which come back to the homeowner.

Sunnyvale is a city of about 155,000 people in the heart of Santa Clara County, bordered by Cupertino and Mountain View to the south and west, and Santa Clara and San Jose to the east. It sits near the headquarters of major tech employers and has one of the highest median household incomes in California - most residents work in engineering, technology, or management and stay in the area for years or decades. The historic Murphy Avenue corridor anchors the downtown core, while Heritage Park near the city center preserves some of Sunnyvale's earliest buildings. The Caltrain station on the east side of downtown connects daily commuters to San Francisco and San Jose and has become the anchor of a growing transit-oriented development zone along El Camino Real.

The city's housing stock is a mix of 1950s to 1970s single-story ranch homes on 5,000 to 7,500 square foot lots and newer attached townhomes near the transit corridors. About 57% of housing units are owner-occupied, and the homeowners here tend to invest in long-term upkeep rather than deferred maintenance. Concrete flatwork is one of the most common areas where that investment is needed - original slabs from the postwar construction era have reached the end of their useful lives across large swaths of the city. We also serve Santa Clara immediately to the south and east, and Cupertino to the west - both cities share Sunnyvale's soil conditions and building stock.