Rotten Window Sill Replace

Is your window sill soft, cracked, or falling apart?

We specialize in rotten window sill replacement in Boston and surrounding towns. Our team brings back both beauty and function — without the need to replace the entire window.

What Causes Window Sill Rot?

Window sills are horizontal surfaces — which means they bear the brunt of rain, snow, and standing water. In New England’s harsh climate, moisture can penetrate the paint and slowly lead to wood rot, mold, and deterioration.

Common Signs of a Rotten Window Sill

Peeling or bubbling paint
Soft or spongy wood when pressed
Cracks, splits, or missing chunks
Visible mold or mildew
Water leaks inside the window

If not addressed, a rotten sill can compromise the structure of the entire window and even lead to damage in your walls and insulation.

Our Window Sill Replacement Process

Inspection & Damage Assessment
We evaluate the extent of the rot to determine if a partial or full sill replacement is needed.
Careful Removal
The damaged sill is removed without disturbing the rest of the window structure.
Custom-Fit Replacement
We craft a custom wooden window sill from durable, rot-resistant wood (such as mahogany, redwood, or treated pine) — matching the original design of your home.
Weatherproof Installation
The new sill is sealed, primed, and painted using high-performance materials to protect against future moisture damage.
Final Finishing
We make sure the area looks seamless and functions properly, blending the repair with your existing exterior.

Why Homeowners Choose Us

Local experts in window sill repair and replacement in Boston
Decades of combined experience with wood rot and restoration
We serve both modern homes and historic properties
Fully insured and committed to craftsmanship

Service Areas

Proudly offering rotten window sill repair in Brookline, Newton, Cambridge, Wellesley, Needham, and throughout the Greater Boston area.