Kenner Law Group, PLC
“He is very knowledgeable, and was able to answer all our questions.”
Best Business Attorneys in Diamond Bar, CA
15 firms listed · 7 in Diamond Bar · 1 open 24/7 · 3 open weekends · 13 rated 4.5+
Data verified October 17, 2026
Alex Ramirez
“He helped me with what I needed and none of us wasted any time getting things done”
Flader & Hirji
“They were successful on every case and achieved tremendous results for me and my business.”
Michael W. Brown
“Once I sat down to meet with Michael, it was evident that he had extensive knowledge and experience as he took his time to answer all of my questions.”
Law Offices of Sue C. Swisher
“Excellent attention and explains in every detail recommended”
Jeanne M Fitzgerald Law Office
“I received an electronic copy prior to the final appointment and everything was well organized for the final signing and notarizing of all the final papers.”
The 15 firms shown for Diamond Bar, CA advise companies on formation, contracts, ownership agreements and transactions. Whatever each one says about its practice areas and fee arrangements is drawn from its own website, and the ratings come from public reviews.
Area overview: Diamond Bar, CA
Of the 15 firms we list here, 7 are in Diamond Bar itself and 8 come from towns including Upland (2, 12 mi), Whittier (2, 12 mi) and Brea (1, 6 mi). 14 of the firms on this page have a rating, from 4.2 to 5.0 across 741 reviews; 8 have 50 or more reviews and 13 are rated 4.5 or higher. When clients rate these firms on specific qualities, they most often praise professionalism (94%), responsiveness (83%) and quality (73%). The topics that come up most in reviews of the firms on this page are "trust", "patient" and "knowledge". 1 is open around the clock; 2 are open on Saturdays and 2 on Sundays. 2 have a BBB rating of A or A+. Domain records put 10 websites of the firms on this page at ten or more years old; the oldest dates from 1999. 1 offers urgent consultations and 6 offer a free initial consultation. We have a website on file for 14 of the firms on this page; 11 publish a contact page; 8 list a public email and 1 takes bookings online. 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 a consultation.
Do business law firms listed for Diamond Bar offer a free first meeting?
A free first consultation is advertised by 6 of the 15 firms. In corporate work that meeting is about scope rather than advice: what you want to do, what documents exist, what an engagement would cover. Bring your ownership structure written down and the deadline you are working towards.
Gloria D Cordova Law Offices
West Coast Lemons APC | Lemon Law Lawyer
“Lemon law can be very confusing and difficult to navigate, however, with the assistance of Michelle Fonseca-Kamana and her office, the process was seamless.”
Law Offices Of Tanya L Willis
“A woman of the upmost character whom have demonstrated to me and my spouse someone who cares about her clients with total integrity, detailed and comprehensive intelligence, and indepth interested counsel resulting in our absolute satisfaction and appreciation.”
RJM Lawyer
“It was a smooth process and I felt completely supported.”
Law Offices of Nicholas Gebelt
“He held our hand every step of the way from our decision to file to the meeting of the creditors to the finalization of the bankruptcy.”
Law Offices of Omar Gastelum & Associates
“This firm has strengthen my loyality, as well as peace of mind in the event I should require attorney support.”
Gaudy Law
“Updating my Trust was quick and easy with Gaudy Law.”
The Wagon Legacy
“Everyone we interacted with in the office was very professional.”
C.S. Scarcella & Associates
“We are very please with the work he has done for us and will trust his services in the future.”
Why these companies made our list
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