Get matched with top structural engineers in Ontario, CA

Ontario homeowners rate structural engineers in our network

4.1

(15 reviews)

Top-rated structural engineers.

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Find Structural engineers in Ontario

Avatar for Alpha Structural, Inc.
Alpha Structural, Inc.
4.6(
241
)

Serving Ontario, CA and surrounding areas

Approved (Corporate)

In business since 1992

Free estimates

Emergency services offered

"Erinn was my initial contact and he gave a very through and fair estimate. We had structural work done to support floor joists and large beams under the garage that needed replacing. Ernesto and his team, Julio, Salvatore and Gilder worked tirelessly to complete the work and were respectful, punctual, informative and good humoured throughout the entire process. I would not hesitate to use them again or recommend them to others. A really great company!!"
Basement Addition
Basement Expansion
Caisson Supported Retaining Wall
Cantilevered Deck Design Build
Deck Expansion and Slope Failure with Retaining Wall

+315

Response time10 hrs
Response rate96%
23 neighbors recently requested a quote
New Beginning Engineering
4.6(
19
)

Serving Ontario, CA and surrounding areas

Approved

In business since 2005

Free estimates

Credit card accepted

"I hired Beginnings Engineering for a structural project on my 45-year-old home and worked with Jonathon Sipe and Nada. I spoke with several other firms in Orange County first. Most of the alternative proposals leaned toward complicated, expensive “perfect” solutions that might make sense on a new build, but didn’t feel grounded in the reality of an older home. Jonathon took a different approach: he listened to what I was trying to accomplish, worked through the constraints with me, and came back with a solution that made sense in the real world—while still being safe and code-compliant. On top of that, the experience was just… easy. Communication was straightforward, follow-through was solid, and they were genuinely friendly people to deal with. They weren’t the lowest engineering quote, but they were the lowest-cost path overall because their design avoided the unnecessary construction scope other firms recommended."
19 neighbors recently requested a quote
Recommended by88%of homeowners
Avatar for RCS Engineering Services
RCS Engineering Services
5.0(
3
)

Serving Ontario, CA and surrounding areas

Approved

In business since 2018

Offers commercial services

Customers say: Quick response

Our firm provides structural engineering support for all phases in the design and construction process. Our primary function is to create structural plan packages for submission to the governing authority. We are also available to conduct preliminary field visits and structural observations during construction. In whichever service you need, we pride ourselves in carrying out the job professionally, quickly, and for an affordable price.

Slab On Grade - Carport
Foundation Underpinning
Existing Wall
Existing Wall/ Form Work
FOundation Underpinning

+15

Response time8 hrs
Recommended by100%of homeowners
Avatar for Alpha Omega
Alpha Omega
4.0(
116
)

Serving Ontario, CA and surrounding areas

Approved

In business since 2003

Free estimates

Small jobs welcome

"If you need a Structural Engineer you call Ehab at Alpha Omega hands down! He is knowledgeable, professional and easy to do business with. Thank you"
Plot Plan for Auto Dealer
Auto Body Shop
Response time10 hrs
Response rate86%
72 neighbors recently requested a quote
Avatar for Pac Sands Corp
Pac Sands Corp
5.0(
7
)

Serving Ontario, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2017

Free estimates

Credit card accepted

"We did a full remodel of our place, full new kitchen, and expanded our place into the backyard for a new master suite. Pac Sands did a really great job with our designs. Great tools that made the communication easy with the plans and changes we needed. And they handled the engineering and permitting too, which was great. Highly recommend."
6-Plex Aerial view
6-Plex Render
Carlsbad 6-Plex Axo
Response time3 days
41 neighbors recently requested a quote
Avatar for Drafting Design Services
Drafting Design Services
4.8(
18
)

Serving Ontario, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Credit card accepted

Offers commercial services

"If you?re here looking for an architect, look no further. Francisco is the man for the job. He helped us with a garage to ADU conversion. Francisco kept us informed and communicated with us throughout the entire project. He was very professional, helpful and patient. We had tons of questions and he had the answers. He is very efficient and great at his job. We would hire him again with no hesitation. Thank you Francisco for making for making this process a breeze!"
Response time2 days
7 neighbors recently requested a quote
Recommended by70%of homeowners
Avatar for CODAspaces
CODAspaces
5.0(
6
)

Serving Ontario, CA and surrounding areas

Approved

In business since 2007

Free estimates

Small jobs welcome

I am a licensed architect who has specialized experience with tenant improvement projects, particularly offices and restaurants. I have also designed residential projects, from ADUs and single family homes to multi-family. I have over 20 years experience and obtained my master's in architecture from Harvard.

Response time1 day
6 neighbors recently requested a quote
Recommended by66%of homeowners
Avatar for Evolution Drafting
Evolution Drafting
3.4(
92
)

Serving Ontario, CA and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

"I hired them to create plans for an apartment building. The process was quick and painless. Cost was good. The plans are full complete abd ready to take to builders for quotes. I will definitly use them again."
Zeal Floor Plan
Charcoal
Palm Floor Plan
Charcoal Floor 2
Charcoal Floor 1

+23

Response time1 day
Response rate100%
44 neighbors recently requested a quote
Avatar for APEX Drafting LLC
APEX Drafting LLC
5.0(
5
)

Serving Ontario, CA and surrounding areas

Approved

In business since 2020

Free estimates

Credit card accepted

We have a single mission: Complete Customer Satisfaction! We have consistently focused on the needs of our customers, providing personalized attention and a stress-free experience.\nYou will find us to be competitively priced with close attention to the details.\nOur reputation is based on service, safety, and quality, regardless of how large or small the job.\nWe look forward to building a lasting relationship and guarantee your satisfaction!\n

Plan set 1
88 neighbors recently requested a quote
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Structural Engineering questions, answered by experts

Dormers must be able to bear the load of their own construction and the added window. The style of the dormer, however, will determine where the weight loads onto your home's structure. A gable dormer bears the weight on the side walls whereas a shed dormer bears it on the front walls.

Yes, ceiling joists are typically load-bearing. However, their primary function is to support the weight of the ceiling and loads applied to it, like lighting fixtures and ceiling fans. They can also help support the roof, especially if they’re part of truss systems. Remember, the load-bearing capacity of ceiling joists depends on the material, size, and space between them. 

No, squeaky floors do not always mean there is structural damage. The noise is often caused by friction from issues like loose floorboards, gaps between the subfloor and joists, or loose subflooring. While many squeaks are harmless, persistent or worsening noise could indicate a more severe problem. If you notice other signs of structural damage—such as soft or sagging floors, cracks running from the wall to the ceiling, or horizontal cracks in your foundation—it's best to have a professional inspect your floor to determine the root cause.

Costs depend on unit complexity, labor, wall mounting needs, and additional accessories like floating shelves.

Accurate measurements, sturdy materials, and seamless integration with other structures.

The Ontario, CA homeowners’ guide to structural engineering services

From average costs to expert advice, get all the answers you need to get your job done.