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Replacement Windows & BiFold Doors Los Angeles
Concept Windows & Doors. From Concept to... Wow!

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Client Testimonials

As developers of luxury single family homes, we have used during the last ten years many window and door suppliers. About two years ago, we saw a new store front named " Concept Windows & Doors " on Sepulveda Boulevard, practically across Costco. We went into that store because the front presented a neat look and an appealingly organized show room. There I met Franklin Castell. His presentation of the enterprise was professional and concrete, highlighted by a history of his experience in the field. Since then we have concluded important purchases at very competitive prices. His service has been outstanding, before and after the sale, with many calls in between to inquire the outcome of the installation, the product or future needs. The practical handholding has always been professional ahead of what one would expect in this trade. Franklin goes beyond the call of duty, always with a smile, a positive attitude, regardless of the outcome between the quote and the actual sale. Our first option when buying doors or windows, is to call Franklin. You won't be disappointed.

Leopold H. – Beverly Hills

Dear Concept Windows & Doors. I want to thank you the excellent job you did in helping me select the ideal windows & door for my properties. Not only were price great but your service care and attention to detail is superb. It amazed me that despite the hundreds of items I ordered from you, from complicated windows to intricate doors to molding to hardware, everything was delivered on time and as ordered. I will recommend you to all my colleagues friends & family. Count me as a very happy customer.

Jeff S. – Studio City

Hello, my name is Ron Eisenberg and I own the Quintessence of Art Co. since 1980. Over 30 years ago I had the very good fortune to have met Mr Franklin Castell and found him extremely knowledgeable on all my door and window requirements.  Whenever, I needed a product or had a very difficult door or window problem Franklin was always there for me with the answers. He is my problem solver!  Over the years we have become friends and I know if there was ever a person to answer or find a product for me, he is the man. I have always received prompt service and if a problem should occur on finding me a product or answer he will always follow up with me and keep me informed on its progress.  All I can say Franklin knows his stuff. Thank you Franklin for always being there for me and my company. 

Ron E. – Canoga Park

In my opinion, doors and windows are one of the most important aspects of any building project.  Besides setting the feel for the house or building, they are one of the most expensive and complicated products to order.  Every opening is different and to execute a project correctly, all those details have to be thought of.  The main reason I use Franklin at Concept Door and Window because of his knowledge and attention to details.  The second reason I use him is because he has the best prices.  I would recommend Concept Door and Window to anyone interested in getting the job done right.

Wes M. – Woodland Hills

After getting quotes from two other places for some windows and doors that we needed to replace in my home I went to Concept Windows & Doors. I want to give a shout out to Franklin who helped us figure out what we really needed instead of what the salespersons at the other places wanted us to purchase and for less money.  We met the owner also who was great such a great feeling to get great customer service along with great prices and knowledgeable people who really know the business of Windows and Doors.  Thank you!

4 Paws Resort & Spa