Large picture windows on mid-century ranch homes — expensive to replace. Premium market supports Marvin and Andersen. Low-SHGC critical given inland heat.
Now Booking Fall 2026: Schedule Your Consultation
Window Replacement Contractor in Lafayette
500+ projects
Since 2018
Limited Lifetime
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Send your window count and project details. We will schedule measurements and review the product and installation options with you.
Window brands and contractor credentials
Customer-Service Obsessed
Responsive from consultation through project closeout
Architect and general contractor
One accountable team
Licensed, bonded, and insured
Verified business credentials
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.
Lafayette's housing stock spans 5% pre-1940, 15% 1940-1959, 40% 1960-1979. Architectural styles range from 1950s-60s California ranch and split-levels on quarter- to half-acre lots in Burton Valley to 1930s-40s cottages near downtown. Each era and style presents different windows requirements — from material compatibility to structural considerations. Our crews know what to expect before they arrive on site.
Lafayette sits in a valley that traps summer heat (high 90s) while its hillside properties face significant wildfire risk as part of the Lamorinda fire zone. Energy-efficient windows with Low-E coatings and proper SHGC ratings are essential for maintaining comfortable indoor temperatures and managing cooling costs in Lafayette.
Lafayette features large-lot homes from the 1950s-70s alongside custom hillside estates, with median home values exceeding $2 million in this affluent Lamorinda community. Many of these homes retain original single-pane aluminum windows that are inefficient and drafty. Modern dual-pane replacements typically reduce energy costs by 15-25%.
The City of Lafayette Building Department handles permits with care for hillside development regulations and fire-safe construction requirements, typically in 4-6 weeks. Hamilton Exteriors (CSLB #1078806) ensures all Lafayette window installations meet California Title 24 energy standards and processes permits through the local building department.
Neighborhoods We Serve
Windows Across Lafayette Neighborhoods
Local planning starts with the site, neighborhood context, access, and applicable city review.
Downtown Lafayette
Downtown Lafayette homeowners frequently choose Hamilton Exteriors for windows. Large picture windows on mid-century ranch homes — expensive to replace. With Lafayette's Summer average 90°F with 5-10 days above 100°F, material selection in Downtown Lafayette requires local expertise.
The Trails
In The Trails, homes are predominantly 1930s-40s cottages near downtown. Premium market supports Marvin and Andersen. Our crews are familiar with The Trails's architectural character and building requirements.
Happy Valley
Many Happy Valley homes in Lafayette still have single-pane aluminum windows from original construction. Dual-pane vinyl or fiberglass replacements reduce energy costs and improve comfort immediately.
Burton Valley
Burton Valley properties near busy corridors benefit significantly from noise-reducing dual or triple-pane windows. The improvement in indoor quiet is one of the most-appreciated upgrades.
Trails
Window replacement in Trails often reveals issues with framing or flashing that need correction. We address these during installation to prevent future water intrusion.
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 Premium Market
Windows Costs in Lafayette
$800–$1,500+ per window
Median home value in Lafayette: $1,900,000
Prices reflect Lafayette's premium market and Contra Costa 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 do replacement windows cost in Lafayette?
Replacement windows in Lafayette typically cost $500-$1,200 per window installed, depending on size, style, and energy rating. Whole-home projects of 10-15 windows range from $8,000 to $20,000.
How much can new windows save on energy bills in Lafayette?
Lafayette homeowners typically see 15-25% reduction in heating and cooling costs with dual-pane Low-E windows. This is especially impactful given the area's hot summers.
What window styles work for Lafayette homes?
We offer casement, double-hung, sliding, bay, and picture windows to match Lafayette's diverse architecture. Our design team helps select styles that complement your home's character.
What are Lafayette's Title 24 window requirements?
California Title 24 energy standards require specific U-factor and SHGC ratings for replacement windows in Lafayette. All windows we install meet or exceed current Title 24 requirements.
How long does window replacement take in Lafayette?
Most window replacement projects in Lafayette take 1-3 days for installation, with 4-6 weeks lead time for custom orders. We install with minimal disruption to your daily routine.
Your Next Step
Plan Your Project With a Clear Scope
Financing may be available with approved credit for eligible projects.
Tell us about your project. We usually call within 3–5 minutes to schedule the next step.
21634 Redwood Rd Unit F, Castro Valley, CA 94546
Serving 88 cities across the Bay Area, Greater Sacramento, and Central Valley. Explore all service areas →