8880 Rio San Diego Drive 8th Floor, CA 92108


Residential x

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.

A multifamily building can be built from the ground up, or a larger building can be remodeled into several homes. We are experienced with both and can assist you throughout the process to ensure all design codes are met, safety regulations are followed, and the designs are optimized to reduce costs.

multifamily building
Accessory Dwelling Units

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, and in the current housing market crisis they are gaining popularity. An ADU building can be attached, detached or repurposing of an existing structure (such as a garage).

As independent living units, the design of an ADU requires both structural as well as MEP design, since the structure includes a kitchen or bathroom and thus needs electricity and water sewage systems. S3DA Design can handle all requirements in house, saving you the need to coordinate between different companies and avoiding design clashes.

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.

For instance, the kitchen can be remodeled to make cooking or cleaning easier. Bathrooms may be remodeled to incorporate the latest designs. The bedroom can be changed to accommodate new furniture or lighting.  Mezzanines can be added to make better use of the space. Each remodeling project is a custom challenge, and our engineers are experts at remodeling who can guide you to make the most efficient use of your space.

Remodel and addition
building safe environments

Home Office

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

However, designing a home office needs lighting design, planning for a soundproof environment, rethink the color scheme of the room as well as paying attention to the storage location for your paperwork and stationery. Our engineers are experts in home office design and can help you through all stages until you receive the final permit.

New Custom Home

Building a new custom home enables you to design everything according to your preferences. However, besides the appearance and comfort, you also need to pay attention to loads, codes and regulations, and safety measures. The house will need electricity, water and sewage systems, HVAC, and air conditioning among other things.

S3DA has years of experience in these sectors, being proficient in codes and regulations and experts in structural and MEP design. For that reason, we can support you in every step of the design phase to ensure you get a permit, without losing any time or budget to design clashes.

New Custom Home

Need help with your structural design?

Evan Wyatt Bliss

Owner & Design Director at STUDIO BLISS LLC

“S3DA Design is one of the best structural and MEP design companies we’ve worked with. Their entire team always delivers us projects of exceptional quality while staying on schedule and under budget. They offer full package design services as well and virtually handle any design projects. We have chosen to work with S3DA Design on our projects”


Chris Cox

Chief Consultant, Development & Planning at BeGreenLegal Cannabis Consulting

“S3DA contacted me through LinkedIn and while I am usually skeptical of cold messages, I was in need of an MEP engineer so I thought I would give them a shot. After more than a year of working on several projects with their team, I have found them to be responsive, reasonable with timelines and budgets, and willing to stand behind their work. While there are many good engineers out there, S3DA’s customer service stands out as a valuable resource.”


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

Brenda Hurley

Licensed Realtor at Excel Realty

S3DA is a very conscientious engineering firm with the mindset of coming up with the best solutions for its clients that are effective and cost-efficient. I would recommend S3DA to support your structural designs on your project.

Brenda Hurley

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

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

New Testimonial

Principle at Locale Real Estate

S3DA Design did a great job for my team and me on structural engineering analysis. They were very responsive and easy to work with. The work product he provided was excellent and thorough, and the project plans we submitted passed a tough Building Department review. I would highly recommend S3DA Design.