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G K & Associates
“Always so Gooooood”
Best Civil, Structural and Environmental Engineers near Diamond Bar, CA
1 of these companies is based in Diamond Bar; the others serve Diamond Bar from towns including Anaheim (11 mi), Orange (13 mi) and Brea (6 mi).
7 open weekends · 20 rated 4.5+ · 3 show a license
Data verified October 15, 2026
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ACC & Engineering
- Team
- Plan
- Ideas
“Their work is extremely accurate, wonderful, and also suitable for all clients; even It's a small work, they don't taking it lightly; they put all their energy into the work so that the result will be marvelous work in an unique picture.”
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Pool Engineering
“What a great bunch of peeps that work here we couldn't build Pools with out them we really appreciate all the help we receive from Pool engineering inc.”
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Bisimoto Engineering
- Shop
- Car
- Cam
“Bisi is the best, friendly service, and clean shop!”
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True Lines. Custom Design
- Team
- ADU
- Collaboration
“True Lines work with me though the entire design and submittal process with the City for my ADU project providing support as needed with the Plan check process as well.”
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Mehas Construction
“I highly recommend this company for business”
Listed for property owners in and around Diamond Bar, CA, these 24 companies do engineering work for properties. Listings show the disciplines each firm names on its own website, from structural to civil site work and environmental assessment, with ratings and quotes from public reviews.
Area overview: Diamond Bar, CA
The 24 companies on this page are rated from 4.0 to 5.0 across 316 reviews; 2 have 50 or more reviews and 20 are rated 4.5 or higher. 7 are open on Saturdays and 5 on Sundays. The services the companies on this page list most often on their websites are construction management (4), design (2) and engineering (2). 3 show a license on their websites and 3 have a BBB rating of A or A+. Domain records put 19 websites of the companies on this page at ten or more years old; the oldest dates from 1996. 6 give free estimates and 1 is family- or locally-owned. We have a website on file for all 24 of the companies on this page; 19 publish a contact page and 22 list a public email. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
How do I tell which firm suits a house?
Websites are listed for all 24 firms on this page. Look at project types. A practice geared to municipal infrastructure or industrial plants may not want a beam job, while a small residential structural firm will turn it round faster and cheaper. Say the scope plainly on the first call.
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Recon Refractory Services
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Kars' Advanced Materials Inc
- Report
- Analysis
- Projects
“We utilized KARS' ADVANCED MATERIALS for several material composition analysis studies for a biocompatibility investigation that required the evaluation of 20+ medical device parts.”
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A To Z Engineering
- Money
- Price
- Design
“I was looking for a structural engineer for our two-story house we higher A-to-Z company and we had a great experience they did excellent designing and save money on construction,Great work and Nobody could beat there price”
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Dary Engineering
“They guided us through the entire process of getting our ADU plans passed with the City of Covina.”
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Uni Construction + Design
- Permit
“Hired uni for design service since city required permit.”
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Peer Review and Verification (Prv) Engineers
- Inspection
“They have assisted our businesses and clients with simple to complex projects.”
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QLC Engineering
“She has been very helpful from the moment I spoke with her and even after she finished my design.”
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Advanced Ground Systems Engineering
“Good service and fast shipping”
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Vantage Company
“This is a great company to work for they are awsome employees and very helpful”
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Transtech Engineers
“Amazing work ethic”
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J.R. Miller & Associates
“Many of the projects are from repeat business, which says a lot about the firm's reputation, character and expertise.”
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Chuck Yaghi Shucri
“A reliable and hardworking team with 30+ years of experience to get the job done”
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Harrington Geotechnical Engineer
“This company deserves definitely more than 5 stars great experience to work with they have a very responsive office and Marty was a very very good inspector to work with thanks again for the quick response and great work...”
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KOA Corporation
“This is where I work”
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Advanced Professional Engineering Consultants
“They are highly professional and extremely efficient as they meet all projects deadlines with the highest quality work If you are looking for a reliable and quality Engineering recommendation, APEC is your best bet.”
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Infrastructure Engineers
- Team
“I have been working with the company for two years and have really enjoyed working with the professional and courteous staff and principals.”
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Geoquake
“Top shelf engineering firm.”
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Cw Construction Inc
“Excellent work, very professional and awesome customer service!!”
Civil & Structural Engineering Services in Diamond Bar, CA Cost Estimates
Minimum cost
$211
Maximum cost
$1326
National Average
$515
Avg Per Hour Rates
$132
$340
$695
Average price range is based on 521 cost profiles
Why these companies made our list
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