Bay Windows

Standard Hardware, Finishes and Screens

Traditionally, Bays are made from three windows: a large picture window flanked by smaller windows on the sides that are set at 30º, 45º, 60º or 90º degree angles. Marvin Bays can be made out of any number of windows, placed at nearly any angle you can imagine. View Ultimate Double Hung or Ultimate Casement windows for more details on hardware, hardware finishes and screens.

Retrofit Return Option

The Retro Fit Bay and Bow Return for Square Jamb Application option allows for a projecting window to replace a standard rectangular window. The return simplifies installation because it conforms to the 90° angle of the existing opening. This makes it easy to set a dramatic bow or bay window into an existing, standard square opening.
  • Can be installed into a standard square opening in either new construction or renovation projects
  • Is available in a variety of angles
  • Makes measurement and prep of the opening easier
  • Factory-applied insulation between jamb and interior return improves thermal performance.

Installation Accessories

Marvin offers a full range of installation accessories to support a wide range of installation scenarios:

  • Vinyl nailing fins (standard)
  • Installation brackets
    • 6 3/8" (162 mm)
    • 9 3/8" (238 mm)
    • 15 5/8" (397 mm)
  • Drip cap
  • Masonry clips 

Panning Systems, Frame Extenders, Frame Expanders, Mullion Covers and Color-matched Coil Stock

These exterior accessories aid in remodeling and replacement installations when existing conditions around the perimeter of the window or door need to be covered. For use with Marvin clad-wood products.


Stone Acorn Builders partnered with Marvin Windows through the Southern Living C...

Stone Acorn Builders partnered with Marvin Windows through the Southern Living Custom Builder Program to design two homes in the Houston area. Marvin’s design flexibility allowed them to create two ...