Looking for a pier and grade beam foundation contractor in the Bay Area? Benitez Concrete Construction builds pier and grade beam foundations for homes and commercial buildings across San Jose and the Peninsula. It is the foundation system we reach for when a site has a slope, expansive clay soil, or load conditions that a standard slab cannot handle, and we have been pouring them here for more than 30 years.
What a pier and grade beam foundation involves
A pier and grade beam foundation carries the weight of the structure down through unstable surface soil to stable, load-bearing soil or bedrock below. Drilled concrete piers are placed at engineered intervals, and a reinforced concrete grade beam spans between them to tie the system together and support the walls above. The result is a foundation that stays put even when the ground near the surface shifts, swells, or settles.
This system fits a range of projects: a new custom home on a hillside lot, an addition where the existing soil will not support a slab, a rebuild on expansive soil, or a commercial structure with concentrated point loads. It works closely with the soils report and the structural engineer’s drawings, so every pier depth, diameter, and reinforcement detail is built to the plan. If you are still weighing your options, our overview of what a pier and grade beam foundation is and when it is used walks through the basics.
Signs a pier and grade beam foundation is the right choice
You are usually a candidate for this system when one or more of these apply to your site:
- The lot is sloped or on a hillside, which is common across Los Altos Hills, Hillsborough, and Los Gatos.
- The soil is expansive clay that swells when wet and shrinks when dry, putting stress on a slab.
- A soils or geotechnical report calls for a deep foundation to reach competent bearing soil.
- You are building a heavy or custom structure where loads need to be carried to specific points.
- An engineer has specified drilled piers and a grade beam on your structural drawings.
If your concern is an existing home that has already settled, that is usually a repair conversation rather than new construction, and our foundation underpinning service is the better starting point. When a new basement is part of the plan, the work often overlaps with our basement construction work.
Why build with Benitez Concrete Construction
Pier and grade beam work is structural, and it is unforgiving of shortcuts, so experience matters. Benitez Concrete Construction is a family-owned company with more than 30 years building foundations across the Bay Area. We hold California Contractor License #706549 (classification C-8, Concrete), and we are bonded and insured. We work alongside your general contractor and architect rather than around them, so the foundation matches the engineering and the schedule everyone is building to.
The proof is in the ground. We have completed pier and grade beam foundations on demanding sites like the Los Altos Hills project on Purissima Road and the Hillsborough Yamaura residence, both lots where a deep foundation was the only sound option. That kind of repeat work on high-value Peninsula homes is why clients keep calling us back.
Our process
We keep the path from first call to finished foundation clear:
- Site visit and review. We walk the site, review your soils report and structural drawings, and confirm what the engineer has specified. Every project is different, so a site visit is how we give you an accurate scope.
- Estimate and plan. You get a written estimate tied to the actual plans, with the pier layout, depths, and grade beam details accounted for.
- Drilling and piers. We drill the piers to the engineered depth, set the reinforcement, and pour to spec.
- Grade beam and finish. We form, reinforce, and pour the grade beam to tie the piers together, then prepare for the next trade on time and on budget.
Where we work
Benitez is based in San Jose and builds pier and grade beam foundations throughout the South Bay and Peninsula, including Atherton, Cupertino, Hillsborough, Los Altos Hills, Los Gatos, Menlo Park, Mountain View, Palo Alto, and Redwood City. Many of these towns have the hillside lots and clay soils where this foundation system is the right call.
[PHOTO SLOT: drilled pier and grade beam foundation in progress on a Bay Area hillside lot. Alt text: “Pier and grade beam foundation under construction on a Bay Area hillside lot by Benitez Concrete.”]
Frequently Asked Questions
What is a pier and grade beam foundation?
It is a deep foundation system where drilled concrete piers reach down to stable soil or bedrock, and a reinforced concrete grade beam spans between the piers to support the structure above. It is used when surface soil is unstable, expansive, or sloped, so the building’s load bypasses the unreliable soil near the surface.
When is a pier and grade beam foundation needed instead of a slab?
It is needed when a slab would sit on soil that moves or cannot carry the load, which is common on hillside lots and expansive clay soils across the Bay Area. A soils report or structural engineer will usually specify it. The piers carry weight to deeper competent soil, something a shallow slab cannot do.
How deep do the piers go?
Pier depth is set by the geotechnical report and structural engineer, not a fixed number. Piers are drilled until they reach soil or rock that can safely carry the load, which varies site by site. We build to the specified depth and diameter on your approved plans.
Do you work with my architect and general contractor?
Yes. We routinely build alongside our clients’ general contractors and architects, matching our work to the structural drawings and the project schedule. Coordinating early keeps the foundation aligned with the engineering and avoids surprises for the trades that follow.
How much does a pier and grade beam foundation cost?
Every project is different, so cost depends on the number of piers, their depth, site access, and the engineering. The honest answer is that a site visit is needed to give you an accurate figure. Once we see the lot and the plans, we provide a written estimate tied to your actual scope.
Build it on solid ground
If your project calls for a pier and grade beam foundation, talk to a contractor who has been building them across the Bay Area for three decades. Request a free estimate or call us at (408) 271-9826 to schedule a site visit.