If you are searching for a window replacement contractor in Sunnyvale, you want someone who understands the specific conditions of Santa Clara County homes. Hamilton Exteriors is an architect-led design-build firm serving Sunnyvale and the surrounding South Bay. We install energy-efficient windows from Milgard, Andersen, and Marvin, backed by a 50-year manufacturer warranty and a workmanship guarantee that lasts as long as you own your home.
Get Your Free Quote — call (650) 977-3351 or request an on-site estimate online.
Why Sunnyvale Homeowners Choose Hamilton Exteriors
Most window replacement companies in Sunnyvale are tradesmen-only operations. Hamilton Exteriors is different. The company is led by Alexander Hamilton Li, a licensed architect and general contractor (CSLB #1078806). That means every window installation is evaluated as part of your home's whole building system — not just a hole in the wall to fill.
We have completed more than 500 projects across the Bay Area, including dozens in Sunnyvale and Santa Clara County. Our crews are factory-trained and manufacturer-certified. Every project gets a dedicated project manager who reports directly to Alex.
Window Styles We Install in Sunnyvale
Single Hung Windows
The most common replacement window in Sunnyvale. Fixed top sash with an operable bottom sash that tilts in for easy cleaning. Standard on Eichler and mid-century homes throughout the South Bay. Installed price: approximately $850 per window (Hamilton Exteriors 2024-2026 project data).
Double Hung Windows
Two operable sashes for better ventilation control. Period-accurate profiles work well on Craftsman and ranch-style homes. Installed price: approximately $950 per window (Hamilton Exteriors 2024-2026 project data).
Casement Windows
Crank-open windows that capture 50 to 90 percent more airflow than sliders and seal tighter than any other operable style. Ideal for Sunnyvale homes that rely on natural cooling during summer months when temperatures reach 95 degrees Fahrenheit or higher. Installed price: approximately $1,050 per window (Hamilton Exteriors 2024-2026 project data).
Sliding Windows
Horizontal sliders that require no exterior clearance. A natural fit for Eichler homes and mid-century modern designs common in Sunnyvale's residential neighborhoods. Installed price: approximately $800 per window (Hamilton Exteriors 2024-2026 project data).
Picture Windows
Fixed panes that maximize natural light and frame views. The most energy-efficient window type available, with U-factors as low as 0.20. Installed price: approximately $950 per window (Hamilton Exteriors 2024-2026 project data).
Sliding Glass Doors
Multi-pane sliders that connect indoor and outdoor living spaces. Configurations up to 16 feet wide. Installed price: approximately $3,800 per door (Hamilton Exteriors 2024-2026 project data).
How Much Do Replacement Windows Cost in Sunnyvale?
All prices are per window, fully installed, and include removal of the existing window, new flashing, materials, labor, trim, and cleanup. Energy-efficient Low-E glass is standard on every window we install. Pricing reflects Hamilton Exteriors 2024-2026 project data.
| Window Style | Installed Price (per window) | Material Cost |
|---|---|---|
| Single Hung | ~$850 | $325 |
| Double Hung | ~$950 | $375 |
| Casement | ~$1,050 | $425 |
| Single Slider | ~$800 | $300 |
| Picture Window | ~$950 | $375 |
| Sliding Glass Door | ~$3,800 | $1,800 |
A typical Sunnyvale home with 15 to 20 windows costs $12,000 to $25,000 for a full replacement (Hamilton Exteriors 2024-2026 project data). Actual pricing varies based on window size, frame material (vinyl, fiberglass, or wood), glass options, and installation complexity. Every Hamilton Exteriors estimate is itemized — window units, trim, flashing, labor, and cleanup listed separately.
Energy Efficiency and Sunnyvale's Climate
Sunnyvale sits in the Santa Clara Valley, where summer temperatures regularly exceed 95 degrees Fahrenheit. According to the U.S. Department of Energy, ENERGY STAR certified windows can save homeowners $125 to $465 per year on energy bills. Hamilton Exteriors installs windows with U-factors as low as 0.25, exceeding California Title 24 energy requirements by 15 to 20 percent.
For Sunnyvale homes, Low-E glass coatings reflect infrared heat while letting visible light through. This keeps homes cooler in summer and warmer in winter. Argon-filled double-pane glass provides the best balance of insulation and condensation resistance for the South Bay's climate.
Permits and Building Codes for Sunnyvale Window Replacement
The City of Sunnyvale requires a building permit for window replacements that change the size or location of an opening. In-kind replacements (same size, same location) may not require a permit, but we recommend checking with the Sunnyvale Building Division to confirm. Hamilton Exteriors handles the entire permit process for any project that requires one — application, plan submission, and scheduling inspections. Permit fees appear as a separate line item in your estimate.
Sunnyvale also enforces California's Title 24 energy code, which sets minimum efficiency standards for replacement windows. All windows we install meet or exceed these requirements.
Seismic Considerations for Sunnyvale Homes
Santa Clara County sits near the San Andreas, Calaveras, and Hayward faults. Parts of Sunnyvale are within mapped liquefaction zones, particularly near the baylands. When replacing windows in older Sunnyvale homes, we inspect the framing around each opening for signs of movement or deterioration. If we find structural issues, we flag them before installation begins and provide a separate quote for any necessary repairs.
Fire Zone Awareness
While Sunnyvale itself is not in a designated Wildland-Urban Interface (WUI) zone, nearby hillside communities in Saratoga, Los Gatos, and parts of Cupertino are classified as Very High Fire Hazard Severity Zones by CAL FIRE. If your Sunnyvale home borders open space or hillside areas, we can advise on fire-rated window and glazing options that meet Chapter 7A standards.
How Long Does Window Replacement Take in Sunnyvale?
Window replacements average 1 to 2 days for a typical Sunnyvale home with 10 to 15 windows. Each window takes approximately 45 to 90 minutes to remove, prep, install, insulate, flash, and trim. Larger projects with 20 or more windows or custom sizes may take 3 days. We install one window at a time and seal each opening before moving to the next, so your home is never left open to the elements.
Financing Options
Most window replacement projects in Sunnyvale range from $12,000 to $25,000 (Hamilton Exteriors 2024-2026 project data). Hamilton Exteriors partners with multiple lending providers to offer $0-down financing with approved credit, 12-month same-as-cash plans, and extended terms up to 15 years for larger projects. You only pay for completed, inspected work. Your project manager will walk you through every payment option during your on-site estimate.
What Homeowners Say
Rated 4.8 stars from 37 verified Bay Area homeowners across Google, Yelp, and Angi. Real reviews from Sunnyvale and South Bay customers highlight our transparent pricing, professional crews, and the energy savings they see after installation.
Get Your Free Quote
Ready to replace your windows? Call (650) 977-3351 or request an on-site estimate online. We will visit your Sunnyvale home within 3 days to measure and quote — at no cost.
Get Your Free Quote — call (650) 977-3351 or fill out the form on this page.
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