Now Booking Fall 2026: Schedule Your Consultation
Bay Area Window Replacement From Measure to Trim
We measure each opening, review frame and glass options, and coordinate flashing, trim, permits, installation, and cleanup.
500+ projects
Since 2018
Limited Lifetime
Select Product Warranties
Get Your Free Window Quote
We'll reach out within 3–5 minutes to schedule your consultation.
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Customer-Service Obsessed
Responsive from consultation through project closeout
Architect and general contractor
One accountable team
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Verified business credentials
Window replacement removes an existing window and installs a new unit within a prepared opening. The work includes measurements, opening repairs, sill and perimeter flashing, insulation, interior and exterior trim, sealants, and operation checks. Product choice should follow the opening, climate exposure, ventilation needs, and applicable energy rules.
Reviewed by Alexander Hamilton Li, Architect & General Contractor · CSLB #1078806 · Updated August 2026
Your next step
Start Your Window Quote Online
Send your window count and project details. We will schedule measurements and review the product and installation options with you.
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.
Window Project Reviews
Verified public reviews from homeowners who hired Hamilton Exteriors.
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!
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.
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.
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!
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.
Compare 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 |
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 does a Northern California window replacement contractor handle?
A window replacement contractor should verify each opening, product size, frame condition, flashing, drainage, insulation, trim, safety-glass needs, energy ratings, and operation. Hamilton Exteriors coordinates those details from measurement through installation and final checks.
Which window brands does Hamilton Exteriors offer?
Hamilton Exteriors offers options from Anlin, Andersen, and Marvin. Available product lines, frame materials, colors, glass packages, hardware, lead times, and warranty terms depend on the project and require confirmation before ordering.
How do you choose the right window style?
We review the opening, ventilation goal, exterior clearance, cleaning access, egress needs, architecture, exposure, and energy requirements. We then explain which operating styles fit and direct you to the detailed page for each window type.
Do you repair the opening and flashing during replacement?
The scope includes visible opening preparation and the flashing method selected for the installation. If removal reveals concealed rot, failed sheathing, or structural damage, we document it and explain the repair before covering the opening.
Do window replacement projects require permits?
Permit requirements vary by jurisdiction, opening changes, safety-glass locations, egress conditions, and structural work. We confirm the permit path, coordinate required documents, and include inspections when the approved scope requires them.
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
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