Custom Window Sills Cut to Size
CustomWindowSills.com offers made-to-measure interior window sills in solid hardwood and solid surface — made to your exact dimensions and shipped nationwide across the United States. Design your replacement window sill online and get an instant quote.
Window Sill Materials
Choose solid hardwood (walnut, white oak, maple, cherry) or Corian solid surface. Hardwood stains come from the Spectrum Finishing library; solid-surface colors include Glacier White, Designer White, Sandstone and Deep Espresso; Every sill is made to order in the edge profile and finish you choose. See all 545 colors and materials.
Window Sill Shapes & Sizes
Order a straight window sill, or a return sill with horns that wrap back to the wall on each side, for single, double and triple-window openings. The configurator accepts lengths from 8 to 160 inches and custom depths to 1/2-inch precision.
Window Sill Edge Profiles
Select an eased, bevel, bullnose, cove, ogee or Roman ogee edge profile, applied to the top arris, bottom arris or both. Visual front thickness ranges from a 1-inch laminated build-up edge up to 2-1/2 inch.
Inside-Corner Radius Options
Match your sill's inside corners to your wall jamb — leave them square, or route a 3/4-inch radius to match a bullnose drywall corner, set independently per corner.
Fabrication & Shipping
Every sill is made to your exact dimensions with machine accuracy, and shipped nationwide. The interactive configurator requires JavaScript — please enable it to design your sill and request a quote.
All 172 Window Sill Finishes
Custom window sills are available in 18 photographed hardwood finishes — Brown Maple, Cherry, White Oak, Walnut, Wormy Maple, Hard Maple, Hickory, Oak, Sap Cherry, Elm, Quarter Oak — plus 77 solid surface colours.
Hardwood stains
Walnut — PCL Harvest, White Oak — PCL Wicker, Brown Maple — PCL Acres, Cherry — PCL Acres, Hard Maple — PCL Acres, Hickory — PCL Acres, Oak — PCL Acres, White Oak — PCL Acres, Wormy Maple — PCL Acres, Sap Cherry — PCL Acres, Brown Maple — PCL Almond, Cherry — PCL Almond, Elm — PCL Almond, Hard Maple — PCL Almond, Hickory — PCL Almond, Oak — PCL Almond, White Oak — PCL Almond, Wormy Maple — PCL Almond, Sap Cherry — PCL Almond, Walnut — PCL Almond, Brown Maple — PCL Amaretto, Cherry — PCL Amaretto, Hard Maple — PCL Amaretto, Hickory — PCL Amaretto, Oak — PCL Amaretto, White Oak — PCL Amaretto, Quarter Oak — PCL Amaretto, Wormy Maple — PCL Amaretto, Sap Cherry — PCL Amaretto, Walnut — PCL Amaretto, Wormy Maple — PCL Amaretto Gloss, Cherry — PCL Limed, Cherry — PCL Bamboo, Cherry — PCL Natural Effect, Cherry — PCL Granola, Cherry — PCL Crystal Shore, Cherry — PCL Seashell, Cherry — PCL Wicker, Cherry — PCL Sand, Cherry — PCL Bel Air, Cherry — PCL Driftwood, Cherry — PCL Flint, Cherry — PCL Natural, Cherry — PCL Honey, Cherry — PCL Classic Country, Cherry — PCL Harvest, Cherry — PCL Chestnut, Cherry — PCL Cappuccino, Cherry — PCL Sandstone, Cherry — PCL American Antique, Cherry — PCL Carbon, Cherry — PCL Smoke, Cherry — PCL Antique Slate, Cherry — PCL Medium Walnut, Cherry — PCL Lemon, Brown Maple — PCL Lemon, Brown Maple — PCL India Ink, Brown Maple — PCL Indigo, Brown Maple — PCL Limed, Brown Maple — PCL Bamboo, Brown Maple — PCL Natural, Brown Maple — PCL Granola, Brown Maple — PCL Crystal Shore, Brown Maple — PCL Seashell, Brown Maple — PCL Wicker, Brown Maple — PCL Sand, Brown Maple — PCL Bel Air, Brown Maple — PCL Driftwood, Brown Maple — PCL Flint, Brown Maple — PCL Natural, Brown Maple — PCL Honey, Brown Maple — PCL Classic Country, Brown Maple — PCL Harvest, Brown Maple — PCL Chestnut, Brown Maple — PCL Cappuccino, Brown Maple — PCL Sandstone, Brown Maple — PCL American Antique, Brown Maple — PCL Carbon, Brown Maple — PCL Smoke, Brown Maple — PCL Antique Slate, Brown Maple — PCL Medium Walnut, Walnut — PCL Seashell, Walnut — PCL Bel Air, Walnut — PCL Natural, Walnut — PCL Carbon, White Oak — PCL Bamboo, White Oak — PCL Natural, White Oak — PCL Granola, White Oak — PCL Crystal Shore, White Oak — PCL Seashell, White Oak — PCL Bel Air, White Oak — PCL Natural, White Oak — PCL Harvest, White Oak — PCL American Antique, White Oak — PCL Carbon
Solid surface colours
Lava Drift, Crème Royale, Rain Streak, Pebble Lane, Stonique, Excavage, Laguna Terrazzo, Peppered Terrazzo, Stonecrest Smoke, Calacatta Greige, Artista Sage, Artista Mist, Provence Nuwood, Bleached Nuwood, Cirrus White, Glacier White, Designer White, Cameo White, Everest, White Jasmine, Arrowroot, Venaro White, Arctic Ice, Dune Prima, Sand Storm, Natural Gray, Artista Beige, Artista Canvas, Artista Dust, Artista Gray, Carrara Crema, Carrara Lino, Elegant Gray, Vanilla, Matterhorn, Bisque, Bone, Sandstone, Sagebrush, Sandalwood, Silver Birch, Abalone, Linen, Clam Shell, Savannah, Sahara, Hot, Aurora, Witch Hazel, Hazelnut, Silverite, Juniper, Pearl Gray, Rain Cloud, Silver Gray, Dove, Silt, Rosemary, Canyon, Sorrel, Platinum, Sparkling Granita, Silver Linear, Sepia Linear, Neutral Aggregate, Ash Aggregate, Weathered Aggregate, Carbon Aggregate, Verdant, Laguna, Lava Rock, Deep Cloud, Deep Mink, Deep Sable, Deep Espresso, Deep Storm, Domino Terrazzo
Frequently asked questions
How do I measure for a replacement window sill?
Measure the length between the jambs, the depth from the window to the leading edge, and — for return sills — the horn length past each side. Our configurator accepts dimensions from 8 to 160 inches to 1/2-inch precision.
What edge profiles are available?
Eased, bevel, bullnose, cove, ogee and Roman ogee, applied to the top arris, bottom arris or both, from a 1-inch up to a 2-1/2-inch laminated build-up.
Can inside corners be radiused?
Yes. Each inside corner on a return sill can be left square or routed to a 3/4-inch radius — the standard for stone and solid-surface fabrication — independently per corner.
What tolerance do you fabricate to?
Every sill is machined to the numbers you give us rather than trimmed from a stock length, and you approve a dimensioned drawing before anything is cut. Bear in mind that solid wood moves a little with seasonal humidity, so we build in the small allowance that needs.
More about custom window sills
Explore our window sill materials and colors (hardwood and solid surface), read the frequently asked questions, or contact us about a custom piece.