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Single-Hung Windows in the Bay Area
Hamilton Exteriors installs single-hung windows. We measure each opening, then install the frame, sill flashing, insulated glass, seals, trim, and operable lower sash. Serving the Bay Area and Northern California.
500+ projects
Since 2018
Limited Lifetime
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A single-hung window has one movable lower sash and one fixed upper sash. The simple operation works well where homeowners want controlled ventilation without opening the upper part of the window.
The opening must support the new frame. We measure width, height, depth, sill condition, exterior finish, interior trim, and visible signs of water entry before setting the replacement scope.
Before ordering, we confirm that the fixed upper sash fits the room's ventilation and cleaning needs. The lower sash must travel freely after the frame is fastened and sealed. Final checks cover balance, lock alignment, screen fit, and sill drainage, because a small frame distortion can change daily operation.
How We Install Single-Hung Windows
The work moves from opening measurements to a sealed and tested window.
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Measure the Existing Opening
We document the frame size, wall depth, sill, exterior finish, interior trim, access, and visible moisture conditions.
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Prepare and Flash the Opening
The crew removes the old unit, completes approved opening repairs, and prepares sill flashing and water-control connections.
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Set, Seal, and Test the Window
We install the frame, insulate and seal the perimeter, complete trim, and check the lower sash, lock, screen, and drainage paths.
Single-Hung Window Installation Check
| Item | What We Review | Installation Effect |
|---|---|---|
| Opening | Width, height, depth, square, and level | Sets frame size and preparation |
| Sill | Condition, slope, flashing, and drainage | Sets water-control work |
| Lower sash | Travel, balance, lock, and screen | Sets operation checks |
| Glass | Insulated unit, coating, and safety needs | Sets the glass package |
| Perimeter | Insulation, sealant, exterior finish, and trim | Completes the opening |
Use the Fixed and Operable Sashes Deliberately
The fixed upper sash keeps the operation simple. The lower sash provides ventilation and screen access. We confirm that this layout fits the room, sill height, furniture, and planned daily use before ordering.
Prepare the Opening Before Setting the Frame
A replacement window depends on the wall around it. We document soft material, prior leaks, uneven surfaces, and trim conditions after removal. Approved repairs and sill flashing come before the new frame is fastened.
Check Operation After the Perimeter Is Sealed
Frame alignment affects how the lower sash moves and locks. We set the unit square, insulate and seal the perimeter, complete trim, and test the sash again before closeout.
Single-Hung Window Financing Options
Single-hung window costs can include opening repairs, sill flashing, insulated glass, frames, trim, sealing, and installation. Financing is available with approved credit for eligible window replacement projects. Small standalone window projects may not qualify. During your consultation, we explain eligible work and payment timing.
Ask whether your single-hung window project qualifies for financing.
Call Now (650) 977-3351 Single-Hung Window Reviews
Verified public reviews from homeowners who hired Hamilton Exteriors.
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.
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.
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!
Frequently Asked Questions
Didn't find the answer to your question? Call Now (650) 977-3351
How does a single-hung window open?
The lower sash moves vertically while the upper sash stays fixed. The lock joins the two sash rails when the window is closed.
What is the difference between single-hung and double-hung windows?
A single-hung window has one movable lower sash. A double-hung window has two movable sashes, which provides another way to control ventilation and reach the glass.
Can a single-hung window replace a different window type?
It can when the opening, wall depth, exterior finish, egress needs, and design support the change. We measure those conditions before specifying the replacement.
How do you keep water out around the new frame?
We prepare the sill, install compatible flashing, connect the frame to the wall water-control layer, and seal the perimeter while preserving planned drainage paths.
Which glass options can be used in a single-hung window?
Available options can include insulated glass, low-emissivity coatings, safety glass where required, and different privacy levels. The opening and project requirements guide the selection.
What do you test after installing a single-hung window?
We check sash movement, balance, locks, screen fit, frame alignment, perimeter seals, drainage openings, and the completed interior and exterior trim.
Get Your Single-Hung Windows Quote
Tell us about your project. We usually call within 3–5 minutes.
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