Premium Sills

The finished ends are fabricated and have a fine seam, similar to traditional fine-crafted wood sills.

Fabricated with Finished Ends

Sill‑Rite Premium Sills provide an attractive accent to any home while offering unsurpassed protection. Available in a classic or contemporary style, Sill–Rite window sills are waterproof and won't rot, peel, or yellow.

  • Made of durable vinyl

  • Protects against moisture

  • Easy to install

  • Low Maintenance

  • Attractive

Sill‑Rite Premium Sills are available in sizes to fit standard window openings. Each sill is completely fabricated with a striking profile on the front and ends, unlike sills that are butt cut.

Premium Profiles

Premium Classic Profile

Sill-Rite’s Classic profile provides an attractive traditional appearance.

Premium Streamline Profile

For a contemporary look, choose Sill-Rite’s Streamline profile.


Premium sills are individually prefabricated to fit typical window openings.

  • Sill Length

  • Measure the width of the inside jamb to the jamb of the window opening. The standard lengths of Sill–Rite sills are meant to fit standard window widths. The sill should extend 1½ to 3 inches beyond the jambs on each side of the window opening

  • Look in the Window Width column of the chart to find the bracket in which the width of your window opening fits. The Sill Length column indicates the recommended sill length. Check the recommended sill length to make sure the sill will fit properly for your window opening

  • For example, if your opening measures 35½ inches, the corresponding sill length is 41 inches. This length sill will extend 2¾ inches beyond the jambs on each side

  • If your window width is not listed, a custom length sill can be ordered. You determine how much the sill extends on either side of the opening (there is no "standard" amount of extension; it's simply a matter of taste). You can also choose the next largest sill if you like the extra extension

NOTE: If you have window casing around your opening, make sure the length of the sill will extend past the trim work.

Sill Depth
Premium sills are available at seven depths — 2in, 3in, 4in, 5in, 6in, 7in, and 8in.

Extended Depths
Sills deeper than 8in are available with an extension kit. These extended depths include:

  • An 8-inch deep sill

  • A vinyl sill extension (to make up the remaining depth)

  • T-strip (to fill the gap between the sill and the extension)

  • Extended Depths: 9in, 10in, 11in

Window Width Sill Length

Installation Instructions

Installation Video

  • Installation Sheets

    Basic Installation Step-by-step instructions for most applications.

  • Installation For Multiple Windows -If you have two or more windows close together, it may be best to install one long sill across a set of windows. These step-by-step instructions show you how.

  • Installation in Bull Nose Drywall —If you have bullnose corners in your sill area, there are a few handy tips for cutting the sill to fit perfectly.

  • Extension Kit Instructions - Sills deeper than 8 inches use an Extension Kit. These are additional instructions for installing Extension Kits.