Call 949-215-1170 now for your free in-home design consultation!

Welcome to 21st Century Doors & Windows
Replacement Windows & Doors - Serving All of Orange County, CA

We carry a wide variety of products to fit most every budget!

Start Your Next Home Improvement
Project With Us...

For the best replacement windows & doors in Orange County, look no further. We are a full service window replacement and door replacement company with many choices available in wood, vinyl, fiberglass, woodclad, or the original Renaissance replacement doors & windows. We offer Simonton, Milgard, PlyGem and ProVia windows and doors. Choose from wide range of ENERGY STAR windows to replace your old, drafty, broken or just outdated windows and become one of our many satisfied customers. Replacement doors also add value to your home whether it's with an entry door, patio door or french doors. ENERGY STAR qualified products not only save energy and money, but help protect the environment, and reduce energy bills.    

From our expert design consultants to our experienced, certified, installation crews or customer service representatives, every member of the 21st Century Doors & Windows family appreciates how important your home is to you. That’s why we’re dedicated to making your experience one that you’ll treasure. Our goal is to continue growing our company. We can only do this by earning your business and providing you the best customer service in the industry.

The 21st Century Experience...Captivating designs...The finest materials...Friendly customer service from start to finish!

Showroom Open By Appointment Only

The cost of replacement windows can be the most effective way to increase the value of your home. Replacement windows in Orange County should be looked at as an investment, and one where you can reasonably expect your home's value to increase. The cost of replacement windows, whether you choose Vinyl, Wood, Fiberglass or Clad can vary greatly depending on the quality and options that you choose. Visit our Product page for more information on the costs of replacement windows, and the pros and cons of the different types of windows available.
21st Century Doors & Windows
For Replacement Windows & Doors
Serving All of Orange County, CA

Request for Free Design Consultation or Questions


*New Location*
Irvine Spectrum Showroom
15791 Rockfield Blvd., Suite O

Irvine, CA 9618



From Rockfield turn East on McClaren, then
right in the first
way. Corner office on the right.


We Design Full Lines of Vinyl, Wood, WoodClad and Fiberglass Doors & Windows

  • Stock and Custom Entry Doors & Dutch Doors
  • Simonton, Milgard, PlyGem & ProVia Vinyl Windows
  • Milgard WoodClad Windows
  • French Doors, complete with our tented threshold
  • Sliding Patio Doors
  • Wood or Fiberglass Bi-fold Doors
  • Bay Windows, Bow Windows, & Garden Windows
  • Interior Doors & Interior Barn Doors
  • Fixed, Sliding, Casement, & Awning Windows
  • Radius & Eclipse Windows
  • Very Custom Doors & Windows

We Offer Custom Doors, Windows and Entries for Both Replacement and New Construction 

  • Traditional, historical wood or custom designed doors & windows
  • Any Size, Shape, or Color 
  • Exterior Clad with paint grade and stain grade interiors
  • We carry many lines of wood, clad, fiberglass and vinyl products to fit most any budget
Certified Installation Master Installers

Our installers are part of a select group of certified window and door “InstallationMasters™” installers for new construction and remodeling projects.

No matter how much you spend on top notch windows, the windows won’t perform properly if they’re not installed correctly. Poor installation techniques can defeat the advantages of the product and result in air or water leaks, wasted energy, or improper operation.

HERO is the Fastest-Growing Residential Energy Efficiency

Financing Solution in the Country.

        Milgard Windows         

Remodeling and Home Design