Window Sash Repair Cases
Rotten Bottom Rail on Lower Sash
4h
Napperville

Before:
The bottom rail of the lower sash was severely rotted due to years of moisture exposure. The wood was soft, crumbling, and the sash could no longer close properly.

Our Work:
– Removed the sash and cut out all decayed wood
– Fabricated and installed a new bottom rail from rot-resistant wood
– Treated all wood surfaces with a preservative
– Primed, painted, and reinstalled the sash

After:
The sash is fully restored, structurally solid, and weather-resistant. It closes tightly and looks original.

before
after
Extensive Rot on Both Sash Sides
5h
Elgin

Before:
Both stiles of the upper sash were rotted from years of water infiltration. The joints were loose and the sash was sagging within the frame.

Our Work:
– Carefully disassembled the sash
– Replaced both side stiles using matching wood profiles
– Reinforced joints with dowels and waterproof adhesive
– Fully refinished the sash with durable exterior-grade paint

After:
The sash now sits square in the frame, operates smoothly, and has regained its original strength and appearance.

before
after

Welcome to our window sash repair portfolio, where we showcase real projects completed across Chicago and the surrounding suburbs. At Window Quality Works, we specialize in restoring window sashes to full working condition — whether they’re stuck, damaged, rotted, or misaligned.

Our goal is to help homeowners keep their original windows functional, efficient, and visually appealing, all while avoiding unnecessary full replacements.

Common sash problems we repair

Over time, window sashes can become difficult to operate, damaged by moisture, or simply worn out. Below are the most common issues we fix to restore smooth, safe, and efficient window function. We deal with:

  • Stuck or painted-shut sashes

  • Broken or frayed sash cords

  • Rotted wood at the sash bottom rail or corners

  • Loose or rattling sashes

  • Sash that won’t stay open (balance failure)

  • Cracked glass within the sash

  • Misaligned or off-track sashes

  • Water infiltration through gaps

We work with both double-hung and casement windows, in wood, vinyl, and aluminum frames — including many historic and custom-built homes.

Why repair a sash?

Window sash repair is a smart and cost-effective way to extend the life of your windows without compromising their original look and function. Sash repair:

  • Restores functionality and airflow.
  • Prevents drafts, leaks and heat loss.
  • Preserves original windows in historic homes.
  • More affordable and environmentally friendly than full window replacement.

By fixing sash problems early, you improve comfort, protect your home, and avoid the expense of unnecessary replacement.