5.0 (5)
1 employee
19 years in business

About this pro

I’m Guy Cosman Cass, Architect, AIA, and I’ve been designing custom homes, additions, and remodeling projects from my studio in Santa Monica, California since 2003, (and large projects since 1985). It’s my passion and I’m thrilled to share it with my clients and their families every day. 

The photos here and on my website ( are the results of working closely with my clients and providing the home design of their dreams. 

Our designing process is exciting, and there’s a practical side to all of this, too. My services include thoroughly evaluating your home site, establishing a realistic construction budget, finding the best contractors, keeping an eye on the construction progress until the house is complete. 

I’m excited to hear your ideas, and share with you the joys of good home design. Shoot me an email at [email protected] or drop me a line and we’ll talk.

Services Provided
Basement Remodeling, Bathroom Design, Building Design, Construction Drawings, Custom Homes, Energy-Efficient Homes, Floor Plans, Green Building, Historic Building Conservation, Home Additions, Home Extensions, Home Remodeling, House Plans, Kitchen Design, Kitchen Remodeling, New Home Construction, Sustainable Design

Areas Served
Bel Air, Beverly Hills, Brentwood Los Angeles, Burbank, Calabasas, Culver City, El Segundo, Encino, Hawthorne, Hidden Hills, Hollywood, Inglewood, Los Angeles, Manhattan Beach, Marina Del Rey, North Hollywood, Pacific Palisades, Playa Del Rey, Santa Monica, Sherman Oaks, Studio City, Tarzana, Topanga, Universal City, Venice, West Hollywood, Woodland Hills, Malibu

Read more about this pro


Santa Monica, CA 90404
Email verified
Phone verified

5 Reviews


  • — Jeff Ourvan, Director, Soka University

    “Dear Guy: I just wanted to drop you this quick note to say how very impressed I am with the restoration and particularly your interior decoration of the residence at the Botanical Center. Your choice of furnishings was excellent — I wish Central Hall could be furnished in a similar fashion. We met yesterday with Dan Preece, of the state park service, at the restored residence, and I believe that the atmosphere you helped to create allowed Preece to be comfortable and honest with us during our conversation. This residence turned out to be a pleasant surprise, and I intend to use it for many more meetings. Thanks for your obvious care in this job.”

  • — Graham Bourne

    met Guy through an interior designer working on the remodel of my home. A couple years later, I contacted Guy to do another remodel on my home and add a guest bedroom suite, rear deck extension and infinity pool & spa over the hillside. Working directly with Guy turned out to be much better. His design was excellent and he made many improvements. His 3D modeling and renders were very helpful to visualize the design and it gave me a very good idea of how it would ultimately look when the construction was completed. Guy was also very instrumental in resolving some issues that arose with the contractor. His experience and professionalism was evident and I will commission Guy again in the future if I endeavor another project.”

  • — Steve Miller, Finance West

    am a residential developer and have done many nice homes in nice areas for many years. During this time I have had the opportunity to work with many accomplished Architects and designers. In the process of designing my own home, I called upon several Architects and designers. The design evolved from one Architect to the next and in the end I was not fully satisfied with the plans. However, I was anxious to get my home built, so I began construction. In the middle of foundation work, I realized the plans were a mess and stopped the work. Guy had just prepared plans for a spec house for me in the Pacific Palisades. I was particularly impressed with the layout of the floor plans and the drawings were well coordinated. He managed to fit everything I requested into a limited area and everything worked and flowed. I received many compliments and praises from my partners and investors. I asked Guy if he could help me out. He responded quickly and began to clean up the plans. In the process, he made suggestions that would improve design. We ended up redesigning the entire building and created the kind of home I had always envisioned and was striving for. I was impressed by his ideas and thoroughly enjoyed our design process together. When my home was completed, it exceeded my expectations. I was so emotionally touched when I first moved in, that it took some time to accept that I was living in such a beautiful space and surroundings. I receive many compliments from everyone that visits. I am so pleased. Guy did a great job and I highly recommend him.”

  • — John Blas, NCS Creative

    “My wife and I have a charming hillside 1930’s Spanish style home which we love. With our first baby on the way, we needed a new bedroom near the master bedroom and a family room near the kitchen to enjoy time together as a new family. One of our main concerns was that we wanted the addition to blend into the existing home so well that one could not see there was an addition. We received several referrals for Architects from our friends and relatives. We chose Guy for many reasons. Guy had done some beautiful Spanish style homes we really liked; one is a historical restoration of the King Gillette Mansion and Caretaker Cottage, originally designed by the well known Architect Wallace Neff. Guy demonstrated to us his understanding of the nature, character and detail of the Spanish style and his designs reflect these. We felt that his projects were warm, inviting and functional. His sensitivity to our concerns, responsiveness and attention to detail were some of the other factors that made our selection easy. The design process, in fact the entire process, went very smoothly and efficiently. We were anxious to complete the addition as soon as possible, in time for our new baby. Guy was easy to work with. He embraced our last minute changes further improving the design, and kept the city approvals on schedule. Today, we thoroughly enjoy our home. We love to entertain and our guests are so impressed. They cannot believe there was an addition and we receive many praises and compliments. It feels like we are living in a resort. We highly recommend Guy.”

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What is your typical process for working with a new customer?

I typically meet with a prospective client to gather client and project information to determine a scope of work and prepare a proposal for approval. 

What education and/or training do you have that relates to your work?

I have a 5 year degree Bachelor of Architecture from SCI-Arc and have been a licnsed Architect since 1985. I am a member of AIA and NCARB. I have many years of experience.

Do you have a standard pricing system for your services? If so, please share the details here.

My fees are based on many factors which I gather during my constultation with my prospective client. My fees are very reasonable and often less than my Architect piers. 

How did you get started in this business?

I had a passion for Architecture and construction when I was a young boy by visiting houses under construction near my home and building many small structures in my backyard. Since I excelled in math, art, and shop classes, I pursued Architecture in college and worked for many Architects. 

What types of customers have you worked with?

I have worked at large Architecture firms on Hotels, Freeway Alignments, and University projects including Historical Restorations of large Spanish style residences. Eventually I began my own private practice designing custom homes in 2003. I have worked with home owners and residential developers during my private practice. 

What advice would you give a customer looking to hire a pro in your area of expertise?

I recommend reading through my website "Process" page and making notes of questions to ask me during my initial consultation. 

What questions should customers think through before talking to pros about their needs?

Its very helpful to mention a maximum project budget when meeting with an Architect so that everything can be based on this.

Services offered