Consulting Structural Engineers

27201 Puerta Real, Suite 300
Mission Viejo, CA 92691
V (949) 248-8588 • F (949) 209-2509


About Allen Designs




T. Willliam (Bill) Allen is one of the area's most respected structural engineers. In case you're not aware yet, structural engineers are a special breed. The education required is substantial, the testing beyond rigorous and the certifications very demanding. But the advantages of working with a licensed structural engineer can take your project from a conglomeration of generic ideas, potential engineering conflicts and mismatched concepts and convert them into a flowing design where virtually every detail has been taken into account. The results ensure you a commercial edifice, new home or home renovation you can take pride in and can enjoy for decades to come.


20411 Rubidoux


Foundation Pour for Family Health Clinic in Rubidoux, CA (click here for more)



What We Do


At Allen Designs, we are committed to only producing the highest quality work. While the word "quality" gets tossed around a lot, Allen Designs takes it commitment to quality very seriously. When you work in 3D as we do, plans and details are clear and concise. Contractor misinterpretation is minimized. Contractors love this. It makes their jobs easier, reduces conflicts and saves everyone time and money.

Working in 3D, our calculations are complete and thorough. Each set of plans is customized to the project. There are very few "standard" details. This commitment to exactness delivers a two-fold benefit. Submitting such a detailed and thorough plans to the building official or reviewing agency, plan check and recheck times are reduced. Plans are ready for bid sooner. This saves time and thus money when an owner is already paying interest on a construction loan. Finally, since our plans are more thorough and tighter, this means bids are tighter (and lower) since the contractor must deal with fewer ambiguities.

Allen Designs uses a process called "calc and fit". This means all plans and details are drawn to scale, ensuring the engineering can actually be assembled in the field. If this sounds a bit unique, know that this is one of the many special processes that has made Allen Designs so successful and Bill Allen so respected. When things go together smoothly, everyone from the top down has an easier time on the job and the job gets done sooner by people who love working with the plans rather than struggling with the plans.

3D drawings. CAD specs. Time and money saved. Contractors and work crews who love the precision of what they're doing. The process and flow become almost seamless. Get the project plans you truly need and keep more of your money. Call us today and put the skills and experience of Allen Designs to work for you!




20505 Commerce Center


Panels being erected for Commerce Center in Moreno Valley, CA (click here for more)



Structure Types


Many different project types have gone out the doors of ALLEN DESIGNS, but the typical projects you will find are single family residences (both new and remodels), restaurants, office buildings, medical office buildings, warehouses, industrial buildings and hotels. 

Structural Materials


We use just about every material here at ALLEN DESIGNS with the exception of pre-stressed concrete and aluminum. Most of the projects you will find at ALLEN DESIGNS consist of wood, masonry, cast-in place and pre-cast concrete as well as structural steel. 

Our "niche" 


To describe the project that is best suited for Allen Designs, the easiest way would be as follows: 


The project is too large for the typical residential designer (who doesn't have substantial experience in the preparation of construction documents), but is too small for a big firm because the project engineer assigned to your project doesn't have the experience needed on your project. One of my colleagues has described this category as "Principal Intensive" projects; one that cannot be delegated to a junior engineer.


20402 Empire Office Buildings 20402 Empire Office Buildings


Empire Office Buildings (click here for more information)