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Architecture Refined Corporation
“Love this place, lots of fun and memories, serving all sorts of fine foods.”
Best Architects in Diamond Bar, CA
24 firms listed · 5 in Diamond Bar · 3 open weekends · 21 rated 4.5+ · 3 show a license
Data verified October 15, 2026
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George K Chou Architects-Engineers
“Lifetime achiever 2017 (Marquis Who's Who in the World)”
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Ladg
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Aguilos Dante G
“Hello Sir: hope you and the family are good; wanted to thank you for assistance you provided along my journey in Architecture:”
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KX + Architects
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ACC & Engineering
- Quality
- Contractor
- Design
“When I looked into aluminum patio companies, they all wanted to hoist the patio above my roof, ACC was one of the few companies that had an architect that could design a structure according to our liking as well.”
Listed for property owners in and around Diamond Bar, CA, these 24 firms take architectural work. The project types each one handles, the stages of service it offers and any license it names are drawn from its own website, next to ratings and quotes from public reviews.
Area overview: Diamond Bar, CA
5 of the 24 firms we list are based in Diamond Bar; the other 19 serve Diamond Bar from towns including Fullerton (10 mi), Anaheim (11 mi) and Ontario (12 mi). 23 of the firms on this page have a rating, from 4.1 to 5.0 across 187 reviews; 1 has 50 or more reviews and 21 are rated 4.5 or higher. 3 are open on Saturdays and 1 on Sundays. 3 show a license on their websites; 1 lists staff certifications (LEED) and 3 have a BBB rating of A or A+. 15 have ten or more years of experience, the longest 37 years. 3 give free estimates and 3 are family- or locally-owned. 1 has Spanish-speaking staff. We have a website on file for 23 of the firms on this page; 21 publish a contact page and 20 list a public email. We count these figures across the firms on this page; distances are straight-line, and hours and prices change, so confirm the details with the firm before you book.
How many listed architects say they are licensed?
3 of the 24 firms on this page show a license on their websites. Ask for the number and check it against the state board, which publishes the register and any disciplinary record. Confirm the individual who will seal your drawings is the one who holds the license, not just a principal whose name is on the door.
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HMC Architects
“They practice what they preach”
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Handyman Contractor
“Great service!”
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Epic Design Build Inc
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CW Restaurant Permit Plan Services
- Health
“Chuck is extremely knowledgeable with the many restrictions set by the Health Dept and he was able to advise me and made the plans perfect for instant approval by Health Dept.”
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Kwwa Architecture
- Urban Planning
- Knowledge
- Team
“Good service!”
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Ariza Architect & Associates
- Plans
“He answered all our questions and concerns in a professional manner and would highly recommend to our friends and family and anybody else looking for an architect.”
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Uni Construction + Design
- Permit
“They have both licensed engineers and architects.”
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Jb3d
- Construction
- Creative
“Every person I have communicated with or worked in the field with always has a great "can do" attitude and everyone is a joy to be around and work with.”
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J.R. Miller & Associates
“Perfect”
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Sandoval Design
“Architect Billy Sandoval is a very professional,I'm very please that he helped me with all the city permits ,which took a huge load off my building process.”
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Amor Architectural Corporation
“Accurate and knowledgeable”
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Bld. Architecture + Interiors
“There's alottt of talent out there, but if you're looking for something different, something unique, and something closer to home- I can honestly say, I recommend BLD.”
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Wismer Architects
“Keith is great to work with.”
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Accurate Laminated Products
“The quality of these cabinets and doors is better than I've ever seen and I 100% will be doing more work with him in the future for any finish carpentry needs!!!”
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Yifu Design Studio
“YDS demonstrated a thorough understanding of the local regulations and requirements, which greatly expedited the approval process, I didn't have to talk to any consultants or building officials from start to finish.”
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Verxile Design & Expediting
“Thanks for your very informative website, i was impressed on the mission of the Company and how its most concern in customer first”
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GO Architects
- Team
“One of the best Architect firm in Town.”
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Pirona Design Group
- Team
- Codes
“They were efficient, knowledgeable with city codes, and responsive.”
Architectural Services in Diamond Bar, CA Cost Estimates
Minimum cost
$632
Maximum cost
$33666
National Average
$5517
Avg Per Hour Rates
$198
$2104
$9423
Typical price range is based on 398 cost profiles
Why these companies made our list
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