Series 450 Brick Mould Windows

Double Hung, 2 and 3-Lite Sliders and Picture Windows

Our top New Construction series combines incredible craftsmanship, seemingly unlimited options together with the strong, maintenance-free vinyl construction to deliver the best windows for any new home. Learn more about RELIABILT Series 450/455 Windows at

Find A Lowe's Store

Instantly Book A Free In-Home Estimate

  • Series 450 Double Hung Windows in Almond with Grids
    Series 450 Double Hung Windows in Almond with Grids

Standard Features and Available Styles

  • Series 450 Double Hung available with Design Pressure (DP) 35 rating
  • Series 451 Slider available with Design Pressure (DP) 50 rating
  • Series 460 DH available without J-Channel and DP 35 rating
  • Series 465 available without J-Channel and DP 50 rating (window size tested 36-in x 74-in)
  • Easy sash movement with a block & tackle balance system
  • Outside air ventilates through standard half screen*
  • Integrated J-Channel and nail fin simplifies installation
  • Custom sizes available
  • Jamb depth: 3-7/8-in
Product Close-Up View
Series 450 Double Hung Windows
Product Close-Up View
Series 451 Slider Windows

Vinyl Color Options




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

Grid Patterns




Perimeter Prairie


Glass Options

  • Low-E Glass
  • Low-E Glass and argon gas for additional efficiency
  • Ultra Low-E Glass and argon gas
  • Obscure, tempered or double-strength glass

Additional Options

  • Continuous head and sill on twins and triples
  • Night latches position sashes for optimal ventilation and safety
  • 3-1/4-in flat casing with optional sill nose style
  • Full screen*
  • Jamb extenders

New Construction Windows

ReliaBilt’s new construction product video provides a detailed look at all of our new construction window offerings.

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.


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

Learn More

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.

Learn More

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.