Window Frame and Sill Repair

Soft wood, peeling paint, gaps and water stains around a window are signs that the frame or sill is failing. We cut out the damage, rebuild the frame or sill, seal it and finish it so water stays out and the window keeps working.

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Free estimatesSince 2017

What we repair

Rotted or soft window sills
Cracked, split or water-damaged frames
Damaged brick molding and exterior trim
Gaps between the frame and the wall
Failed caulking and sealant
Frames in wood, vinyl, aluminum and clad windows

Why frames and sills rot

Sills sit at the bottom of the window, where rain and melting snow collect. Once paint or caulk cracks, water soaks into the wood, freezes and thaws through the winter and slowly rots it. Catching it early means a smaller repair. Read the signs of wood rot in window frames.

How we fix it

We remove the rotted wood, replace the section or the full sill, treat and fill smaller damage, then prime, paint and seal so the repair lasts. If the window itself still works, there is no need to replace it. When rot has spread through the whole frame, we will show you and talk through replacement.

See our work

Many of the before-and-after photos in our gallery are frame and sill repairs on homes in Chicago and the suburbs.

Frame and sill questions

Can a rotted window sill be repaired?

Yes. Small areas can be filled and sealed. Larger rot is cut out and the sill section or full sill is replaced, then painted and sealed.

Do I need a new window if the frame is rotted?

Not usually. If the damage is limited to the sill or part of the frame, we repair it and keep the window. We will tell you if the damage is too widespread.

How do I know if my frame is rotting?

Press the wood with a screwdriver. If it feels soft or crumbles, or if paint is peeling and the wood is dark, it needs attention.

Do you repair vinyl and aluminum frames too?

Yes. We repair cracked or damaged vinyl and aluminum frames and reseal gaps around all frame types.

Molding and trim

Window molding and trim repair

The molding around a window does more than look good. Outside, brick molding and exterior trim close the gap between the frame and the wall. Inside, the casing and stool finish the opening. When molding rots, splits or pulls away, water and drafts get in, and the damage spreads to the frame and sill.

Rotted or soft brick molding and exterior trim
Split, cracked or loose interior casing
Gaps where the trim has pulled away from the wall
Missing or damaged pieces around old wood windows

We repair the damaged wood where we can and replace the pieces that can’t be saved, matching the existing profile as closely as possible. Then we caulk, prime and paint so the repair blends in with the rest of the window.

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