Ground-Up Construction

Ground-up custom home construction gives Bay Area homeowners complete control over layout, materials, energy systems, and architectural style. Unlike production builders who offer a fixed set of floor plans with cosmetic upgrades, a ground-up build starts from your lot and your vision. Hamilton Exteriors manages every phase under a single design-build contract: site analysis, architectural design, structural and civil engineering, permitting, demolition of any existing structure, foundation, framing, mechanical systems, finishes, and landscaping. Our licensed architect, Alexander Hamilton Li, leads design and construction, which means you work with one team from first sketch to final walkthrough.

Bay Area custom home construction costs range from $400 to $800 per square foot depending on site conditions, finishes, and complexity. A 2,500-square-foot home on a flat lot in Fremont or San Jose with mid-range finishes typically runs $1M to $1.5M for construction alone, while a 3,500-square-foot hillside home in the Oakland or Berkeley hills with high-end finishes and engineered foundations can reach $2M to $2.8M. These figures include design, engineering, permits, and construction but exclude land acquisition. We provide a detailed line-item budget at the end of schematic design so you know exactly where every dollar goes before construction begins.

Lot acquisition is the first decision and often the most consequential. In Palo Alto's Professorville or Old Palo Alto neighborhoods, teardown lots sell for $3M to $5M, while buildable lots in East San Jose or Milpitas start around $500K to $800K. Key factors we evaluate with clients include zoning (R-1 single-family vs. R-2 duplex-eligible), lot slope and drainage, soil type (expansive clay is common in Fremont, Union City, and Hayward), utility availability, and neighborhood design review requirements. We often accompany clients on lot visits to assess buildability before purchase, saving months of surprises later.

Site planning starts once you control the lot. We survey existing conditions, map setback requirements, identify the optimal building footprint, and orient the home to maximize natural light and cross-ventilation while preserving privacy from neighbors. In hillside areas like the Oakland hills, Montclair, or Saratoga, site planning also involves geotechnical investigation, slope stability analysis, and engineered grading plans. For flat lots in cities like Sunnyvale, Santa Clara, or Campbell, the work focuses on stormwater management, utility connections, and maximizing usable outdoor space within setback and lot-coverage constraints.

The architectural design process follows five stages: programming (documenting your requirements, lifestyle, and priorities), schematic design (producing two to three concept options with floor plans and 3D massing studies), design development (refining materials, window schedules, kitchen and bathroom layouts), construction documents (complete blueprint set with structural, mechanical, electrical, and plumbing details), and permit coordination. Our architect uses building information modeling (BIM) to create detailed 3D renderings at every stage, so you can walk through your home virtually and catch issues before they become expensive field changes.

Engineering for Bay Area custom homes goes well beyond standard structural calculations. Every home we build meets Seismic Design Category D standards at minimum, with enhanced performance targets for hillside and soft-soil sites. Geotechnical reports determine foundation type: conventional spread footings for stable flat sites, deepened footings or drilled piers for expansive clay soils, and engineered pier-and-grade-beam systems for hillside lots. In liquefaction-prone areas like Foster City, Redwood Shores, and parts of the San Francisco Marina, we design mat foundations or deep pile systems based on site-specific soil boring data. Our structural engineers also design for wind loading in exposed hilltop and ridgeline locations throughout the East Bay hills and Marin headlands.

Permitting across Bay Area cities varies dramatically in complexity and timeline. A straightforward new home in San Jose may clear plan check in 8 to 12 weeks, while a hillside project in Los Gatos with design review board requirements can take 6 to 9 months. Cities like Walnut Creek and Lafayette require neighborhood notification and design review hearings. Palo Alto enforces individual review for homes exceeding certain floor-area-ratio thresholds. Unincorporated San Mateo County requires story pole installation so neighbors can visualize the building's height and footprint. We manage the full permit process, respond to plan check corrections, and attend hearings on your behalf.

Construction follows a defined critical-path schedule. Site work (demolition, grading, utilities, and foundation) takes 4 to 8 weeks. Vertical construction (framing, roofing, windows, and exterior cladding) runs 8 to 14 weeks. Rough-in phase (electrical, plumbing, HVAC, insulation, and low-voltage wiring) takes 4 to 6 weeks. Finish work (drywall, flooring, cabinetry, countertops, paint, fixtures, and final grading) runs 8 to 14 weeks. We provide weekly progress reports with photos, updated schedules, and budget tracking so you always know where the project stands.

Financing for ground-up custom homes typically uses a construction-to-permanent loan. The lender approves the total project cost, disburses funds at each construction milestone (foundation, framing, dry-in, rough-in, finish), and converts to a standard 30-year mortgage at completion. Down payment requirements are typically 20 to 25 percent of total project cost including land. Homeowners who own their lot outright can often use land equity as their down payment. We work with several Bay Area lenders who specialize in construction loans and can provide pre-qualification letters within 2 to 3 weeks. Our detailed project budgets and schedules help lenders underwrite efficiently, which means faster funding and fewer delays.