Napa's climate presents a dual challenge for windows: blocking intense summer heat that regularly exceeds 100 degrees while maintaining insulation during cold, foggy winter mornings. Dual-pane Low-E glass is essential here, reducing solar heat gain by up to 70 percent in summer while keeping warm air inside during winter. Hamilton Exteriors installs windows meeting California Title 24 Climate Zone 2 requirements for every Napa project.
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Window Replacement Contractor in Napa
500+ projects
Since 2018
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For local cost factors and planning, read our Window replacement cost guide for Napa.
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Send your window count and project details. We will schedule measurements and review the product and installation options with you.
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Responsive from consultation through project closeout
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One accountable team
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Window Styles 
Choose the Window Style That Fits the Opening
Single-Hung Windows
A fixed upper sash and operable lower sash for familiar operation, ventilation, and a straightforward replacement path.
Single-Slider Windows
Horizontal operation where exterior swing clearance is limited, with the opening and drainage details measured before ordering.
Sliding Glass Doors
Large glazed openings coordinated with sill support, flashing, drainage, operation, safety glass, trim, and adjacent finishes.
Picture Windows
Fixed glass for daylight and views, planned around glass size, exposure, energy ratings, structural support, and interior trim.
Double-Hung Windows
Two operable sashes for flexible ventilation, with frame proportions and trim selected for the home and opening.
Casement Windows
Hinged windows with compression seals, planned around swing clearance, hardware access, ventilation, and egress needs.
Many Napa homes still have original single-pane windows, particularly in Old Town and the older neighborhoods of Browns Valley and Westwood. These windows waste energy, allow noise infiltration from Highway 29 traffic, and often have deteriorated seals and frames. Upgrading to modern dual-pane windows typically reduces heating and cooling costs by 15 to 25 percent for Napa homeowners.
Wine country views are a defining feature of Napa homes, and window replacement should enhance rather than obstruct those sightlines. We offer picture windows, sliding glass doors, and custom configurations that frame vineyard and hillside views while meeting energy codes. Our team handles permitting, Title 24 compliance calculations, and installation with minimal disruption to your home.
Neighborhoods We Serve
Windows Across Napa Neighborhoods
Local planning starts with the site, neighborhood context, access, and applicable city review.
Browns Valley
Browns Valley homeowners upgrade windows for energy savings and comfort during Napa's hot summers. Hamilton Exteriors installs dual-pane Low-E windows that reduce solar heat gain while maintaining views of the surrounding Valley landscape. We handle permits and Title 24 documentation.
Old Town Napa
Old Town Napa's historic homes often have original single-pane windows that waste energy and lack sound insulation. Hamilton Exteriors sources period-appropriate window profiles with modern performance, preserving Old Town's character while dramatically improving efficiency.
Westwood
Westwood's ranch homes from the 1950s and 60s typically have aluminum-frame single-pane windows ready for replacement. Upgrading to vinyl or fiberglass-frame dual-pane windows transforms comfort and energy costs. Hamilton Exteriors completes most Westwood whole-home replacements in 2 to 3 days.
Bel Aire
Bel Aire families benefit from windows that keep interiors comfortable year-round without excessive heating or cooling. Hamilton Exteriors installs energy-efficient windows meeting Title 24 Climate Zone 2 standards, reducing utility costs while improving indoor comfort for Bel Aire residents.
Silverado
Silverado homes near fire zones may require tempered dual-pane windows meeting fire resistance standards. Hamilton Exteriors verifies your Silverado property's requirements and installs windows that meet or exceed all applicable fire zone and energy code standards.
Alta Heights
Alta Heights properties with hillside views deserve windows that maximize those sightlines. Hamilton Exteriors installs picture windows, sliding doors, and custom configurations that frame Napa Valley views while meeting energy and safety requirements for Alta Heights' elevation.
Project Management How Hamilton Exteriors
How Hamilton Exteriors
Manages Your Window Replacement
Opening Measurements
We measure each opening and review frame conditions, drainage, egress, safety glass, and trim before ordering.
Window and Glass Selection
Your proposal identifies the manufacturer, operating style, frame, glass package, energy rating, finish, hardware, and installation method.
Flashing and Installation
We coordinate removal, opening repairs, sill and perimeter flashing, insulation, window setting, trim, sealants, and permits.
Operation and Closeout
We test operation and locks, check sealants and finishes, complete cleanup, and review applicable product and workmanship warranties.
Google rating 4.6 ★ from 47 public reviews
Window Project Reviews
Verified public reviews from homeowners who hired Hamilton Exteriors.
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Renee D.
via HomeAdvisor
I scheduled to have someone come give me an estimate for all new windows in our 1950s home with not so great Remodeling work by previous owners. Alex Li promptly met with us & his crew throughout the entire process. They were always on time to work, left our home clean of debris & spectacular new JeldWin windows. Helped me with getting Financing as well...Just all around a great experience & highly recommend!
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Ethan W.
via HomeAdvisor
I recently hired Hamilton Exteriors to replace my siding and windows, and they did a fantastic job. Their team was punctual, polite, and paid close attention to detail. The siding looks seamless, and the new windows have made a noticeable difference in both appearance and energy efficiency. Communication was always clear, and they finished on time and within budget. I’m very happy with their work and would definitely recommend them.
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Robert H.
via Angi
From the very first consultation, we knew we'd made the right choice. The team was knowledgeable and genuinely listened to our concerns about energy efficiency and design. We've already noticed a drop in our energy bills.
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H.T.
via Google
I had a great experience working with Hamilton exteriors. From start to finish, their team was professional, responsive, and detail-oriented. They made the entire process smooth and stress-free, keeping me updated every step of the way. The quality of their work really stands out. Everything was done efficiently and exceeded my expectations. If you’re looking for a reliable company that takes pride in what they do, I highly recommend them!
Google rating: 4.6/5 from 47 public reviews
Read reviews on Google Mid Market
Windows Costs in Napa
$450–$800 per window
Median home value in Napa: $850,000
Prices reflect Napa's mid market and Napa County labor rates. Actual costs depend on home size, materials, and project complexity. We provide free, itemized estimates with no hidden fees.
Get Your EstimateCompare Broad Window Operation Types
Swipe to compare all options.
| Feature | Single Hung | Double Hung | Casement | Slider | Picture |
|---|---|---|---|---|---|
| Operation | Lower sash moves | Both sashes move | Hinged sash opens | One sash slides | Fixed glass |
| Ventilation path | Lower opening | Upper and lower openings | Full sash opening | Half of frame opening | None |
| Clearance review | Interior access | Interior access | Exterior swing area | Track and meeting rail | Glass and trim access |
| Main detail focus | Sash balance and seal | Two sash seals | Hardware and compression seal | Track and drainage | Glass, frame, and flashing |
| Dedicated guide | Single hung | Double hung | Casement | Single slider | Picture window |
Window Financing
Plan Your Window Replacement With Approved Credit
Financing may be available for eligible multi-window and whole-home replacement projects with approved credit. During your window consultation, we review the product and installation scope, then explain current lender programs, terms, and payment timing.
Ask which current options fit your window replacement project.
Call Now (650) 977-3351 Frequently Asked Questions
Didn't find the answer to your question? Call Now (650) 977-3351
What areas do you serve?
We serve Northern California across three regions: the San Francisco Bay Area, Greater Sacramento, and the Central Valley. Our published guides cover 14 counties and 88 cities. Our Castro Valley and Sacramento offices support local estimating, permit coordination, and project planning across these regions.
How does billing and financing work?
Financing may be available for eligible projects with approved credit. Available terms depend on lender approval, project scope, and current programs. Your project manager can review the options that apply before work begins. We also accept checks, ACH, and major credit cards.
Are you licensed and insured?
Yes. Hamilton Exteriors holds CSLB License #1078806, active general liability coverage, and the required contractor bond. We also hold GAF Master Elite and James Hardie Elite Preferred credentials. We can provide current proof of coverage before work begins.
Do I need a permit for my exterior project?
Permit requirements depend on the project scope and local jurisdiction. Hamilton Exteriors coordinates required applications, plan documents, corrections, and inspections. Permit fees and allowances appear in the proposal before construction begins.
How Much Does Window Replacement Cost in Napa?
The selected windows and installation scope determine the price. Ask the estimate to list each product and glass specification, plus removal, flashing, trim, and repairs. Confirm inclusions in writing instead of assuming every window uses the same glass or installation details.
Do I Need a Permit for Window Replacement in Napa?
Check your window schedule with the City of Napa Building Division before ordering or starting work. Identify changes to openings, window operation, and the property address. Confirm the permit, plans, energy documentation, inspections, and current fees that apply to the actual project.
How much does window replacement cost in Napa?
A typical Napa home with 15 to 20 windows costs $12,000 to $25,000 for a full replacement. Per-window pricing ranges from $600 for a basic single-hung vinyl window to $1,400 for a premium casement window. All Hamilton Exteriors estimates are itemized — window units, trim, flashing, labor, and cleanup listed separately. See our full window replacement cost guide for detailed pricing.
What type of windows are best for Napa's climate?
For Napa's hot summers, casement windows provide the best ventilation and tightest seal. Picture windows offer the best energy efficiency for rooms where ventilation isn't needed. Low-E glass with a Solar Heat Gain Coefficient of 0.25 or lower is recommended for south- and west-facing windows. Fiberglass frames perform best in Napa's temperature extremes and are non-combustible for fire-zone compliance.
Do I need fire-rated windows in Napa?
If your home is in a Very High Fire Hazard Severity
Your Next Step
Plan Your Project With a Clear Scope
Financing may be available with approved credit for eligible projects.
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21634 Redwood Rd Unit F, Castro Valley, CA 94546
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