(503) 314-9728 dorian@thermoloc.co

Serving all of your window and door needs since 1990

With over 28 years in the business, Therm-O-Loc is the source for all of your window and door needs. We are happy to pass on our knowledge to you and show you the value that a window installation can add to your home. Whether you are replacing the old windows in your home or working on a new construction project, our team of highly trained professionals will work with you every step of the way. We ensure the highest quality of service and leave your home looking beautiful, all while meeting the best energy efficiency standards.                   

We are Milgard certified to provide the highest quality window replacement and installation services throughout the Portland Metro area.


Whether you are looking for a full replacement of all of your windows and doors, simply looking to fix broken glass in an existing window, or anything in between, Therm-O-Loc provides all of the services that you need. We provide a free in-home consultation to help you select the right windows and doors for each opening. Our knowledgeable experts will explain all of your options and help you decide on the products and services that best suit you and your home’s needs. Once selected, our skilled, efficient, and cleanly team will come out and provide a hassle free installation, leaving your home looking and feeling great.

Locations Served

Headquartered in Portland Oregon, we serve the entire Portland Metropolitan area and Southwest Washington.  Some of the locations that we serve include:



West Linn


Lake Oswego



Battle Ground






We are quite pleased with the Milgard windows that Dorian and his crew installed as replacements to our old wooden cased windows. We had 20 windows to replace and Dorian and his crew got the job done in one day!! Therm-O-loc was the lowest bid we received and we are very pleased with the end results. We would be pleased to recommend Dorian's company to anyone who would like to know how happy we are.

Bob Palmer

I have done business with Dorian at Therm-O-Loc for 15 years. He really delivers, consistent, on-time and an all round good guy. I was so happy to have him tear out a terrible window and install one that works for me. He never disappoints.

Mary Franklin

We are very happy with our 14 new Milgard replacement windows. The price, quality of installation, product, cleanliness, consideration of our animals, general demeanor, and thoughtfulness of you and your crew were excellent. We would be happy to recommend you anytime, and hope you can do some other projects for us in the future.

John Klosterman

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Therm-O-Loc Showroom