Professional Window Replacement in San Leandro, CA
If you are searching for a window replacement contractor in San Leandro, you need a team that understands the specific conditions of Alameda County homes. Hamilton Exteriors provides architect-led window replacement for San Leandro homeowners, combining factory-certified installation with city-specific permit knowledge. We serve San Leandro and all of Alameda County from our Castro Valley base, putting us within 30 minutes of your home.
Every window we install includes energy-efficient Low-E glass, proper flashing against Bay Area moisture, and a 50-year manufacturer warranty. Our estimates are fully itemized — window units, trim, flashing, labor, and cleanup listed separately so you see exactly where your money goes.
Get Your Free Quote — we will call within 3 to 5 minutes to schedule your on-site consultation.
Why San Leandro Homeowners Choose Hamilton Exteriors
San Leandro sits in a mild Mediterranean climate zone, but the proximity to the San Francisco Bay means homes experience coastal fog and salt-laden air that accelerates corrosion on exposed window frames and flashing. According to the U.S. Department of Energy ENERGY STAR program, upgrading from single-pane to dual-pane Low-E windows can save homeowners $125 to $465 per year on energy bills. For San Leandro homes built before 1990 — which make up a significant portion of the city's housing stock — the savings are even more pronounced.
Hamilton Exteriors is led by Alexander Hamilton Li, a licensed architect and general contractor (CSLB #1078806, verify on CSLB.ca.gov). Unlike most window contractors who are tradesmen-only, Alex brings an architect's eye to every project, evaluating how windows affect your home's energy performance, ventilation, and overall design.
Our Window Services in San Leandro
We install a full range of window styles to match San Leandro's diverse architecture — from mid-century ranches in the Bayshore area to newer developments in the hills.
Single-Hung Windows
The most common replacement choice for San Leandro homes. A fixed top sash with an operable bottom sash that tilts in for easy cleaning. Standard on most post-war homes throughout the city.
Double-Hung Windows
Both sashes operate, creating natural convection airflow. Period-accurate for Craftsman and Victorian homes found in San Leandro's older neighborhoods near downtown and Estudillo Estates.
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 homes near the bay where you want to capture afternoon breezes without letting in moisture.
Sliding Windows
Horizontal sliders that require no exterior clearance. A strong fit for Eichler-style and mid-century modern homes common in San Leandro's post-war developments.
Picture Windows
Large fixed panes that maximize natural light and frame views. The most energy-efficient window type since they have no moving parts. Sizes up to 8 by 6 feet.
Sliding Glass Doors
Multi-pane sliders that connect indoor and outdoor living spaces. Configurations up to 16 feet wide. Available from Milgard, Andersen, and Marvin.
Window Replacement Cost in San Leandro
Window replacement costs in San Leandro depend on the style, frame material, and number of windows. Here are typical installed prices for 2026:. Pricing reflects Hamilton Exteriors 2024-2026 project data.
| Window Style | Price per Window (Installed) |
|---|---|
| Single-Hung (vinyl) | $600 to $1,200 |
| Double-Hung (vinyl) | $700 to $1,500 |
| Casement (vinyl) | $800 to $1,500 |
| Slider (vinyl) | $600 to $1,100 |
| Picture Window | $800 to $2,500 |
| Sliding Glass Door | $2,500 to $4,500 |
All prices include removal of the existing window, new flashing, materials, labor, trim, and cleanup. Energy-efficient Low-E glass is standard on every window. Actual pricing varies based on window size, frame material (vinyl, fiberglass, or wood), glass options, and installation complexity. A typical San Leandro home with 15 to 20 windows costs $12,000 to $25,000 for a full replacement (Hamilton Exteriors 2024-2026 project data).
For a detailed breakdown, see our window replacement cost guide.
San Leandro Building Permits for Window Replacement
San Leandro requires building permits for window replacements that change the size or location of openings. The San Leandro Building Department handles all permit applications. Permit fees typically range from $200 to $600 depending on the scope of work. Hamilton Exteriors handles the entire permit process — application, plan submission, and scheduling inspections — so you do not have to worry about city requirements.
If your home is in a Wildland-Urban Interface (WUI) fire zone — common in the Oakland and Berkeley Hills but less so in San Leandro's flatland areas — specific fire-rated glazing may be required. We will verify your property's fire zone designation during your on-site consultation.
Climate and Seismic Factors for San Leandro Windows
San Leandro's location near the Hayward Fault means seismic considerations matter. The California Geological Survey maps the Hayward Fault running through the eastern edge of Alameda County. While window replacement itself does not typically trigger structural upgrades, if you are widening openings or adding larger windows, a structural inspection may be required. We coordinate with structural engineers when needed.
The mild Mediterranean climate means San Leandro homes experience moderate temperatures year-round, but coastal fog can accelerate corrosion on aluminum window frames. We recommend vinyl or fiberglass frames for homes within 5 miles of the bay — these materials resist corrosion better than aluminum and provide superior insulation. For homes in San Leandro's inland areas, where summer temperatures occasionally exceed 90 degrees, Low-E glass with a low solar heat gain coefficient (SHGC) helps keep interiors cool without overworking your air conditioning.
What Sets Hamilton Exteriors Apart
Architect-led design-build. Most window contractors are tradesmen who install what you tell them. Alex Hamilton Li is a licensed architect who evaluates your home as a complete system — considering ventilation, energy performance, structural capacity, and aesthetics together. This means you get recommendations that improve your home's comfort and efficiency, not just a window swap.
Factory-certified installation. Every crew member is manufacturer-certified by Milgard, Andersen, Marvin, or Anlin. We hold GAF Master Elite, Owens Corning Preferred, CertainTeed ShingleMaster, and James Hardie Elite Preferred certifications — each requires annual training and quality audits to maintain.
50-year warranty. All windows carry a 50-year manufacturer warranty backed by our own workmanship guarantee for the full duration. If anything fails, we fix it at no cost to you.
Transparent pricing. Every estimate is itemized line by line — window units, trim, flashing, labor, permit fees, and cleanup. every line itemized, every cost itemized.
Your own project manager. One dedicated point of contact from first call to final walkthrough. You will always know who to reach.
Get Your Free Window Replacement Quote in San Leandro
Ready to replace your windows? Hamilton Exteriors serves San Leandro and all of Alameda County. Call us at (650) 977-3351 or Get Your Free Quote online. We will call within 3 to 5 minutes to schedule your on-site consultation.
View all Alameda County service areas | Oakland window replacement | Hayward window replacement
Call Now (650) 977-3351 
