If someone told you that you need to replace your whole window, get a second opinion first. In many cases, a sash replacement solves the problem at a fraction of the cost. KKC Glass assesses honestly — no pressure toward the more expensive option.
Local expertiseProfessional installationResidential & commercial
01Our expertise
What Is a Window Sash?
The sash is the movable frame that holds the glass inside a window. In a double-hung window — the most common style in Charlotte homes — there are two sashes: the upper and the lower, each sliding independently. In a casement window, the sash swings open on hinges. In a sliding window, the sash moves horizontally.
The sash is separate from the window frame — the structural part that's fixed into the wall. When people say their window is "broken" or "fogged," the problem is almost always in the sash, not the frame. And that distinction matters, because replacing just the sash is significantly cheaper than replacing the entire window.
02
Signs Your Sash Needs Replacing
Fog or condensation between panes
The insulated glass unit inside the sash has failed. In many cases the glass can be replaced independently, but when the sash frame itself has deteriorated, a full sash replacement is the cleaner solution.
Fog or condensation between panes
The insulated glass unit inside the sash has failed. In many cases the glass can be replaced independently, but when the sash frame itself has deteriorated, a full sash replacement is the cleaner solution.
Drafts around a closed window
The sash is no longer sealing properly against the frame — due to warping, weatherstripping failure, or damage to the sash corners.
Drafts around a closed window
The sash is no longer sealing properly against the frame — due to warping, weatherstripping failure, or damage to the sash corners.
Difficulty opening or closing
A warped or swollen sash, damaged balance hardware, or a failed operator in a casement window. Sometimes a hardware fix is all that's needed — we assess which applies.
Difficulty opening or closing
A warped or swollen sash, damaged balance hardware, or a failed operator in a casement window. Sometimes a hardware fix is all that's needed — we assess which applies.
Visible damage to the sash frame
Cracked vinyl, rotted wood, or bent aluminum sash frames that compromise the window's structural integrity and ability to seal properly.
Visible damage to the sash frame
Cracked vinyl, rotted wood, or bent aluminum sash frames that compromise the window's structural integrity and ability to seal properly.
Sticking or binding
A sash that sticks, binds, or requires significant force to operate — often caused by warping, failed weatherstripping, or worn balance components.
Sticking or binding
A sash that sticks, binds, or requires significant force to operate — often caused by warping, failed weatherstripping, or worn balance components.
Failed weatherstripping
When the weatherstripping is worn out or missing, the sash can no longer seal against drafts, moisture, and noise. Sometimes a weatherstripping replacement is all that's needed before a full sash swap is warranted.
Failed weatherstripping
When the weatherstripping is worn out or missing, the sash can no longer seal against drafts, moisture, and noise. Sometimes a weatherstripping replacement is all that's needed before a full sash swap is warranted.
03
Sash Replacement vs. Full Window Replacement
This is the most important question to answer before any money is spent. Here's how we think about it:
KKC Glass is an authorized service provider for 12 window manufacturers. That means when your window needs a new sash, we source it directly from the manufacturer — or through the manufacturer's authorized parts channel — not from a generic aftermarket supplier. A generic sash may fit the opening, but it won't match the original specifications for glass thickness, spacer material, weatherstripping profile, or hardware mounting points. An OEM sash from the original manufacturer fits correctly, performs correctly, and in the case of warranty work, satisfies the manufacturer's replacement requirements.
05
Our process
From your first call to a clear view.
1Assessment
We evaluate the window — frame condition, sash condition, glass unit condition, hardware — and determine whether a sash replacement, glass-only replacement, or hardware fix is the right solution.
Details
We evaluate the window — frame condition, sash condition, glass unit condition, hardware — and determine whether a sash replacement, glass-only replacement, or hardware fix is the right solution.
1
Assessment
We evaluate the window — frame condition, sash condition, glass unit condition, hardware — and determine whether a sash replacement, glass-only replacement, or hardware fix is the right solution.
2Measurement
We measure the existing sash precisely and identify the manufacturer, model, and generation to source the correct replacement.
Details
We measure the existing sash precisely and identify the manufacturer, model, and generation to source the correct replacement.
2
Measurement
We measure the existing sash precisely and identify the manufacturer, model, and generation to source the correct replacement.
3Parts Sourcing
We order the OEM sash through our authorized manufacturer channels.
Details
We order the OEM sash through our authorized manufacturer channels. Lead time varies by brand and model — typically 1–3 weeks.
3
Parts Sourcing
We order the OEM sash through our authorized manufacturer channels. Lead time varies by brand and model — typically 1–3 weeks.
4Installation
The old sash is removed and the new one is installed.
Details
The old sash is removed and the new one is installed. Hardware is transferred or replaced as needed. The window is tested for proper operation, sealing, and weatherstripping contact.
4
Installation
The old sash is removed and the new one is installed. Hardware is transferred or replaced as needed. The window is tested for proper operation, sealing, and weatherstripping contact.
5Warranty
KKC Glass backs the installation with a one-year workmanship warranty.
Details
KKC Glass backs the installation with a one-year workmanship warranty.
5
Warranty
KKC Glass backs the installation with a one-year workmanship warranty.
06
Frequently Asked Questions
What is a window sash?
The sash is the movable frame that holds the glass inside a window. It is separate from the window frame, which is fixed into the wall. Replacing just the sash is significantly cheaper than replacing the entire window when the frame is in good condition.
Do I need a sash replacement or a full window replacement?
If the window frame is in good condition, a sash replacement is usually the right call. If the frame is rotted, damaged, or structurally compromised, a full replacement may be necessary. We assess both and give you an honest recommendation.
Can you source sashes for my specific window brand?
Yes. KKC Glass is an authorized service provider for PlyGem, Lincoln, Atrium, Silver Line, Sierra Pacific, Simonton, Windsor, Harvey, American Craftsman, Cascade Windows, Northstar Windows, and Prime Window Systems. We source OEM sashes for these brands.
How long does a sash replacement take?
The assessment and measurement visit takes 30–60 minutes. Sash sourcing takes 1–3 weeks depending on the brand and model. The installation itself is typically completed in a single visit of 1–2 hours.
How do I request an estimate?
Yes — estimates based on the details you provide for straightforward sash replacement situations.