About Us

Our regular business hours are Monday thru Friday, 8am to 5pm.  Due to the COVID-19 Pandemic, our showroom is open by Appointment Only as it is currently closed to the general public.

Please call us at (760) 591-4257 to schedule your visit with us. We will be happy to assist you.

Thank you for your patience during these challenging times.

General Millwork Supply is a full-service window and door dealer located in San Marcos, CA.

We serve the entire County of San Diego and its surrounding areas.

We have over 50 years of experience in the building industry.
Family owned and operated by Tom and Wendy Duran since 1991, our company specializes in selling quality nationally known brand-name windows and doors to homeowners, building contractors and architects.
Our company is proud to have one of the largest showrooms in San Diego County, displaying windows, doors, skylights, mouldings and door hardware to match virtually any architectural style and budget plan.

General Millwork Supply offers a large selection of high quality wood, wood clad, fiberglass, vinyl and aluminum windows & patio doors, entry doors and skylights, including those from many manufacturers listed on our site under Our Brands.  In addition, we supply exterior and interior doors, wardrobe doors, decorative moulding, door hardware, faux beams and many other specialty building products.  We also offer products from many other manufacturers and can special order those hard to find or unusual items.  If you don’t see the product category you’re interested in, call or drop us a line and we’ll do our best to get you what you need.  We are committed to providing you with the excellent customer service and prices you can afford.  Improve your home’s appearance while saving on heating and cooling bills with our quality windows and doors.

One-stop shopping… Whether you are remodeling or building a new home, we can help!

General Millwork Supply, Inc. (GMS,Inc.) is family owned & operated by Thomas & Wendy Duran, located in the heart of North County, San Marcos, California.  After moving to North County from their native state Connecticut, they opened their business in December of 1991 when small businesses were struggling to stay alive in a depressive economy.  The company was established during tough economic times at their one location and has weathered three recessionary periods; the last one being the toughest of the three.  They are “Celebrating 28 Years in Business” and attribute their success by planning and staying inside the lines on the guiding principles of the company’s core values.  By staying the course on a solid business plan through reinvesting in the company and focusing on the health of the company’s relationships with suppliers and its professional customers has enabled them to thrive.  These are some key reasons why General Millwork Supply has recently received these awards and honors that they proudly achieved over the past few years:    The 2010 “Dealer of the Year” in Overall Excellence and Leadership in the Professional Market by Window & Door Magazine; U-T San Diego – Voted one of “San Diego’s Best” Favorite Window and Door Company by the UT San Diego Reader’s Poll in 2012,2013,Finalist 2014,2016,2017&2018; Voted “Best of Houzz 2014,2015,2017&2018” in Service from the leading platform of home remodeling & design for customer satisfaction honors; 2014 Top Specialists – Listed as one of 2014 Top Specialists under $5 Million in Window & Door in May 2014 Magazine;   GMS, Inc. was the 5th largest Window & Door Dealer in sales for Andersen Windows, Inc.  in Southern California for 2013.

In addition to these honors, GMS, Inc. has received many good reviews on YELP & HOUZZ along with others from their customers over the years.  Through the use of social media:  the GMS Facebook page, Instagram, Pinterest & Houzz sites provide helpful consumer information & ideas on products & services offered at GMS, Inc.  Photos of projects that our products were provided for show before & after pictures as well as whole house remodels.  This website has written Testimonials from some of the contractors & homeowner customers.

The internet has been instrumental helping new customers find us; whether it be Google, our supplier’s & manufacturer’s websites, referrals,  the social media sites GMS, Inc. has, the longevity of their URL, etc.; all contribute to help the company be found by their customers.
GMS, Inc. has many homeowner customers that you would expect to buy from you typically one time, but they have come back to them many years later to buy more windows and doors for their home & are happy to still find GMS, Inc. in the same location especially after one of the worst recessions ever.

It is very gratifying to Tom & Wendy that they made it through another recession since the building & remodeling industry was hit so hard for years, while many other competitors had to close their doors.  Sustaining their business is definitely something the owners, Tom and Wendy are thankful for! 

Meet the Business Owners
The Duran’s moved from the East Coast to the West Coast more than 28 years ago.
After moving to the North County Tom had wanted to take the experience he had built in the window and door industry since getting out of college in 1977 and perhaps start his own company.  He had run a branch location of a large lumber company which specialized in windows and doors on the East Coast and was confident that he learned enough from his mentors to run a successful business.  Tom has over forty years of experience in the building industry and likewise with our sales representative on staff. He needed some time to learn the local marketplace and his West Coast customers.  He then put together a business plan, a mission statement and developed a marketing strategy while looking for locations to start his own business.  When he started General Millwork in 1991, he pulled on his past experiences to shape how he would present his company to professionals in his area.  He learned well from people who knew how to run a business and used much of that expertise to benefit his business today.  Wendy had the background education in Graphic Design, Business & Marketing with much experience in Customer Service making her a great complement to team up with her husband.  They have been working side by side ever since.
Today, GMS, Inc. has successfully grown and is one of the largest showrooms in San Diego County.  Our success is a direct attribute to hard work and strong commitment to excellence through teamwork.

Our Mission Statement states, “It is the mission of General Millwork Supply, Inc. to serve our customers with a commitment to excellence which will be second to none.  We will provide products that are nationally known that you can trust and are backed by a solid reputation of product quality and customer service.  It is our intention to offer prompt and accurate plan assistance as well as clear, easy to read estimates with no surprises.  We will offer competitive pricing that is tailored to your budget and specifications as well as backed by more than forty years experience in the building industry.”  This is a true testament to the success of the company over the last 28 years and making good business decisions that allowed the company to get through these tough recessionary years.  GMS, Inc. is proud to have been providing their customers with “Quality Products & Exceptional Service Guaranteed!” since 1991. 

Call or stop by our beautiful showroom today for a free quote from our professional, no-pressure staff. We look forward to meeting you!