Custom Shape Windows

Octagons, Trapezoids, Full Circles, Half Rounds

From octagons and trapezoids to full circles, half rounds and more, we will custom build almost any window to help make your home stand out and fulfill your specifications.

These windows are compatible with all series of Replacement RELIABILT windows.

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  • Custom Shape Eyebrow and Trapezoid Windows above Double Hungs in White
    Custom Shape Eyebrow and Trapezoid Windows above Double Hungs in White

Standard Features and Available Styles

  • Standard sizes are available, plus a full range of architectural options to accommodate any building style, from Colonial to Contemporary and Cape Cod to Southwest
  • Available factory mulling for quick, hassle-free installation
  • Operable Eyebrows & Half Eyebrows available in Series 150/160
Product Close-Up View
Multiple Custom Shapes Available

Vinyl Color Options



Laminated Color Options

Light Oak


Dark Oak

Painted Color Options


Brick Red



Dark Chocolate


Hunter Green



Note: Device/Monitor screen settings may affect color shown. Please refer to actual window sample when selecting colors. Laminates and exterior painted options available on select products, if they are not shown above they are not available on this product. Interior and exterior laminates available on white window only. Only use mild, water based household cleaner on painted product and rinse immediately with water. See full cleaning instructions for details. Grid offering limited to 5/8” contoured or SDL on exterior painted windows.

Grid Types

5/8-Inch Flat Grid

3/4-Inch Flat Grid

5/8-Inch Contoured Grid

1-Inch Contoured Grid

1-1/8-Inch Simulated Divided Lite (SDL) Grid

Glass Options

  • Low-E Glass
  • Low-E Glass and argon gas for additional efficiency
  • Ultra Low-E Glass and argon gas
  • Obscure and tempered glass
  • Decorative beveled and leaded glass

Additional Options

  • Factory mulling simplifies installation
  • Paintable or stainable wood jamb extensions (4-9/16 inch and 6-9/16 inch)
  • Custom sizes available

ReliaBilt Manufacturing Story

Our windows and sliding doors are recognized for their high-quality craftsmanship, innovative engineering and close attention to detail. Learn more about the process used to make them.

Low-E and Argon Gas

Learn how Low-E coatings on glass and argon gas filled between glass panes reduces energy usage and improves the year-round comfort of your home.


Looking for ENERGY STAR qualified products? Learn more about the climate zones and performance criteria used to identify ENERGY STAR compliant windows and doors.

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The RELIABILT Warranty

Every RELIABILT window and patio door is backed by a limited lifetime warranty on vinyl, glass and all working parts. Each product is individually registered with a product identification number, making ordering replacement parts throughout the warranty period easy and efficient.

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RELIABILT Product Care

RELIABILT windows and doors are designed for easy care and maintenance. Click the button below to download RELIABILT’s window and door care and maintenance guide.

Download Guide

Let's Get Started

Schedule a free, no-obligation in-home consultation with Lowe's to get RELIABILT windows and doors for your home today.