8880 Rio San Diego Drive 8th Floor, CA 92108

About Us

Who We Are x

S3DA Design is a California based architectural, structural & MEP engineering firm, composed of passionate and professional engineers with over 20 years of experience. We operate throughout the state of California  and Arizona.

We offer services to architects, real estate developers, contractors and homeowners.


Structural and MEP Projects


Commercial and Industrial


Years in the Industry


Total square feet covered

Our Services x

We offer both structural and MEP design services to commercial, industrial and residential projects. Including:

Multifamily Buildings

Multifamily housing refers to a building that contains more than one dwelling unit, and they are continuously gaining popularity especially because of housing shortage; such buildings enable more homes in dense municipalities.

Structural Calculations

Our structural calculation follows local building codes, therefore not only ensures you can get a permit but also consider value engineering to cut down actual construction costs.

Remodel and Addition

Over the years, your housing requirements change. Home remodeling allows you to make better use of your space and adapt to those changing needs.

Home Office

Working from home is a new trend. Many have seen the benefits it offers while others are drawn to it by necessity. Having a dedicated place for work greatly improves concentration and work productivity.

Warehouse Design

Warehouse design is a specialty of S3DA Design, as such projects often require both structural as well as Mechanical, Electrical, and Plumbing (MEP) designs, particularly for HVAC systems.


A mixed-use building combines several functions into one structure. For instance, parts of a building may be devoted to hotel rooms while other parts are used for residential units and commercial services.

Restaurant Design

Restaurants differ from other kinds of buildings because of the importance of their kitchen. A kitchen must be safe, competent, easy to maintain, and functional.

Accessory Dwelling Unit (ADU)

ADUs are tiny homes, mostly built for the purpose of renting to family members at lower-than-market rates. They offer an effective option to increase the value and space of your home.


Some of our HVAC services include mechanical drafting and design, mechanical detailing, 3D REVIT modeling, schematic heating, and cooling system design…

Electrical Design

An accurate electrical design plan is crucial to accurately measure the energy usage of each component in the building, allowing to optimize for maximum efficiency.

Title 24

S3DA Design has experienced engineers who design to meet those goals, using the latest technology, and years of experience. Some of our Title 24 services include Title 24 calculation, remodeling lighting, Title -24 envelope, and Title 24 mechanical.

Solar Design

Solar power is increasingly popular, particularly in California which has made solar power mandatory for newly designed homes as part of Title 24, Part 6. Solar power reduces your energy bills…

Why Choose Us x

Both Structural and MEP

Few companies offer a single source of responsibility like we do.

Reduced Expenses

Our unique process ensures there will be less design clashes and waste.

Fast Turnaround

Our efficient processes and professional engineers leave no time lost.

Great Support

Reach out to us anytime. We are fast with responses and available any time.

Quality Work

We design according to local codes, aiming for safety and reduced construction costs.


We have done everything from commercial and instrial buildings to small residential homes.

References x

We have a history of satisfied clients.

Belal Siddiqui

Owner of Mobius Designs 

S3DA Design team are a good hard working group of professionals. They provide great communication, drawings and feedback during all aspects of the design and permitting process. I have worked with them on multiple commercial and residential projects and they always deliver in a timely manner and are priced very well. I recommend using them on any project. Their drawings are methodical and easy to understand, which makes the job easier for everyone!

Belal Siddiqui

Joe Serrano

CEO/Exec. Director at TentMakers Inc./ReCycled Housing

S3DA Design is a very critical engineering partner for us and our clients because of their attention to detail and professional relationship building skills. They have a very sincere concern for the quality of their work and satisfaction of their clients. Our company provides residential design services requiring the services of a professional structural engineering firm. We have worked with other engineering firms in the past, but S3DA Design has out performed all competitors on several fronts including pricing. But more importantly, it is S3DA’s relationship building and communication skills that have impressed me the most. They sincerely care about the quality of their work and the satisfaction of their clients. I highly recommend them and their work.

Joe Serrano

Steve Poehlein

Chief Designer at sp design+build

I truly enjoy working with the S3DA Design team. We have completed several projects and they are professional, communicative, and expedient. They deliver good solutions quickly for a competitive price.  Their work usually passes plan check on the first submittal. I highly recommend the S3DA Design team.

Steve Poehlein