Window sill repair portfolio | Window QW

Sill repair cases

Exterior wood window sill repair

3h

Aurora

Before:

The homeowner noticed peeling paint, soft wood, and signs of moisture damage along the bottom of the window frame. Upon inspection, we found the outer sill partially rotted, especially near the corners. Water infiltration had begun affecting the lower trim as well, but the main frame remained structurally sound.

Our repair process:

Carefully removed damaged and rotted wood from the sill.
Treated surrounding areas with wood hardener to stop further decay.
Custom-cut and installed a new sill section using rot-resistant wood.
Recaulked all seams and primed the new surface.
Painted to match the original exterior trim.

After:

The sill was fully restored — solid, sealed, and visually seamless with the rest of the window frame. The repair blended perfectly with the existing trim, and the window was now protected against further moisture intrusion. The homeowner regained peace of mind and saved money by avoiding a full window replacement.

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after

Window sill repair rase – Naperville, IL

4

Naperville

Before:

The homeowner reported soft, crumbling wood at the base of a first-floor window. Upon inspection, we found advanced rot along the outer edge of the wood sill, with visible cracks, peeling paint, and mild water infiltration into the surrounding trim. The sill was no longer providing proper drainage, risking further structural damage.

Repair Process:

Carefully removed the rotted portion of the sill without disturbing the window frame
Treated surrounding wood with rot-preventive hardener to stabilize the material
Custom-fabricated and installed a matching section using rot-resistant wood
Sealed joints with waterproof caulk
Primed and painted the repaired area to match the home’s exterior trim

After:

The sill was fully restored to its original look and strength. The repaired area blended seamlessly with the window trim, ensuring water-tightness and improved durability. The homeowner avoided a costly full window replacement and was extremely satisfied with the quick, clean result.

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after

Welcome to our window sill repair portfolio, where we showcase completed projects in the Chicago suburbs. From rotten wood window sills to cracked or weather-damaged surfaces, our team of experts restores functionality and appearance—often within a single day. Whether your window sill needs minor cosmetic repairs or a complete structural overhaul, Window Quality Works delivers long-lasting results thanks to our high level of craftsmanship.

What we fix:

Rotted wood window sills
Cracked or split sills due to age or weather
Water-damaged sills
Peeling paint, mold, or soft spots
Poorly installed or sagging sills
Exterior and interior sill repairs

We work with wood, composite, and custom sill designs, and we match the original style and finish of your home.

Why homeowners trust us

Same-day sill repairs available
Experienced craftsmen trained in structural and aesthetic restoration
Custom materials and finishes to match any window style
Serving all neighborhoods of Chicago and surrounding suburbs

Why repair your window sill?

A damaged window sill isn’t just an eyesore — it can lead to water intrusion, rot, drafts, and energy loss. Whether it’s wood or composite, interior or exterior, our team ensures your sill is structurally sound, sealed, and visually perfect.

Ready to repair your window sill?

We take pride in every repair and invite you to explore our portfolio to see the quality of our work.
Get in touch today to schedule your window sill repair or request a free estimate.