63/100LFR Score
Ranked #1 because of its Google rating and practice area focus: 5.0★ from 134 Google reviews, listed on Google as “Business attorney”.
Business Lawyers in Diamond Bar, CA: 2026 rankings
66 business lawyers ranked by LFR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Highest LFR Score in Diamond Bar: Sari Law Firm, LFR Score 63/100; 5.0★ from 134 Google reviews; open Saturdays until 5 PM.
- 3
Open 24 hours (per Google): Luther Lanard, PC, posts 24/7 hours; ranked #3 of 66.
- 7
Most-reviewed: Morgan & Morgan, 448 Google reviews at 4.7★, the most of 66 ranked; ranked #7.
Rankings can't be bought. Lawyers can't pay to change their rank or score. How we rank
66 Diamond Bar business lawyers are ranked here by LFR Score, from nine published factors. 7 are open 24/7, 13 open Saturdays and 9 open Sundays, based on posted hours. The median Google rating is 4.8★ across 66 rated law firms.
Top 10 business lawyers in Diamond Bar at a glance
Ranked by our published LFR Score from public data, not by payment; a rank is not an endorsement or a prediction of results.
| Rank | Business | LFR Score | Google rating | Based in | Hours | Notable for |
|---|---|---|---|---|---|---|
| 1 | Sari Law Firm | 63 | 5.0★ (134) | Irvine, 24 mi away | Sat | Top score |
| 2 | Adams Corporate Law, Inc. | 62 | 5.0★ (18) | Anaheim, 15 mi away | Sat · Sun · Evenings | — |
| 3 | Luther Lanard, PC | 62 | 4.7★ (25) | Newport Beach, 25 mi away | Open 24 hrs (Google) | Open 24 hours |
| 4 | The Law Offices of Thomas S. Carter | 61 | 4.7★ (24) | Claremont, 7 mi away | — | — |
| 5 | Newmen Law | 60 | 4.9★ (66) | Santa Ana, 19 mi away | — | — |
| 6 | Empire Business Law, Inc. | 60 | 5.0★ (21) | Ontario, 13 mi away | — | — |
| 7 | Morgan & Morgan | 59 | 4.7★ (448) | Riverside, 20 mi away | Open 24 hrs (Google) | Most reviews |
| 8 | The Law Office of Nicholas Terwilliger | 57 | 5.0★ (3) | Moreno Valley, 10 mi away | — | — |
| 9 | Counts Law Firm PC | 55 | 4.5★ (95) | Pasadena, 20 mi away | Open 24 hrs (Google) | — |
| 10 | McCune Law Group | 55 | 4.3★ (44) | Ontario, 13 mi away | Open 24 hrs (Google) | — |
All 66 business lawyers in Diamond Bar, in rank order
Ordered by LFR Score, a 0–100 score from nine published factors. Paid placement never changes the order.
Ranked by our published LFR Score from public data, not by payment; a rank is not an endorsement or a prediction of results.
Scores below: based on 7 of 9 factors; bar status and recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Anaheim, 15 mi away
62/100LFR ScoreRanked #2 because of its Google rating and practice area focus: 5.0★ from 18 Google reviews, listed on Google as “Business attorney”.
Based in Newport Beach, 25 mi away
62/100LFR ScoreRanked #3 because of its Google rating and practice area focus: 4.7★ from 25 Google reviews, listed on Google as “Business attorney”.
Based in Claremont, 7 mi away
61/100LFR ScoreRanked #4 because of its Google rating and practice area focus: 4.7★ from 24 Google reviews, listed on Google as “Business attorney”.
#5 Newmen Law
Based in Santa Ana, 19 mi away
60/100LFR ScoreRanked #5 because of its Google rating and practice area focus: 4.9★ from 66 Google reviews, listed on Google as “Business attorney”.
Based in Ontario, 13 mi away
60/100LFR ScoreRanked #6 because of its Google rating and practice area focus: 5.0★ from 21 Google reviews, listed on Google as “Business attorney”.
Based in Riverside, 20 mi away
59/100LFR ScoreRanked #7 because of its Google rating and review volume: 4.7★ from 448 Google reviews, the most in Diamond Bar.
Based in Moreno Valley, 10 mi away
57/100LFR ScoreRanked #8 because of its Google rating and practice area focus: 5.0★ from 3 Google reviews, listed on Google as “Business attorney”.
Based in Pasadena, 20 mi away
55/100LFR ScoreRanked #9 because of its Google rating and practice area focus: 4.5★ from 95 Google reviews, listed on Google as “Attorney”.
#10 McCune Law Group
Based in Ontario, 13 mi away
55/100LFR ScoreRanked #10 because of its Google rating and practice area focus: 4.3★ from 44 Google reviews, listed on Google as “Law firm”.
Based in Avocado Heights, 12 mi away
55/100LFR ScoreRanked #11 because of its Google rating and review volume: 5.0★ from 141 Google reviews.
Based in Irvine, 24 mi away
54/100LFR ScoreRanked #12 because of its Google rating and practice area focus: 4.2★ from 5 Google reviews, listed on Google as “Business attorney”.
Based in Downey, 20 mi away
53/100LFR ScoreRanked #13 because of its Google rating and review volume: 5.0★ from 158 Google reviews.
#14 Argo Law, PC
Based in Anaheim, 12 mi away
53/100LFR ScoreRanked #14 because of its Google rating and practice area focus: 4.9★ from 82 Google reviews, listed on Google as “Estate planning attorney”.
#15 Wade Litigation
Based in Los Angeles, 25 mi away
53/100LFR ScoreRanked #15 because of its Google rating and practice area focus: 5.0★ from 24 Google reviews, listed on Google as “Family law attorney”.
Based in Orange, 17 mi away
52/100LFR ScoreRanked #16 because of its Google rating and practice area focus: 4.6★ from 21 Google reviews, listed on Google as “Employment attorney”.
Based in Anaheim, 12 mi away
52/100LFR ScoreRanked #17 because of its Google rating and review volume: 4.6★ from 100 Google reviews.
Based in Irvine, 25 mi away
52/100LFR ScoreRanked #18 because of its Google rating and practice area focus: 5.0★ from 17 Google reviews, listed on Google as “Employment attorney”.
Based in Tustin, 19 mi away
52/100LFR ScoreRanked #19 because of its Google rating and practice area focus: 4.9★ from 18 Google reviews, listed on Google as “Real estate attorney”.
#20 Snyder Law, PC
Based in Irvine, 24 mi away
52/100LFR ScoreRanked #20 because of its Google rating and review volume: 5.0★ from 156 Google reviews.
#21 AEI Law, PC
Based in Huntington Beach, 23 mi away
52/100LFR ScoreRanked #21 because of its Google rating and review volume: 5.0★ from 112 Google reviews.
Based in Diamond Bar
52/100LFR ScoreRanked #22 because of its Google rating and practice area focus: 4.4★ from 14 Google reviews, listed on Google as “Estate planning attorney”.
#23 Wade Litigation
Based in Irvine, 25 mi away
52/100LFR ScoreRanked #23 because of its Google rating and practice area focus: 5.0★ from 14 Google reviews, listed on Google as “Family law attorney”.
Based in Anaheim, 13 mi away
52/100LFR ScoreRanked #24 because of its Google rating and practice area focus: 5.0★ from 7 Google reviews, listed on Google as “Attorney”.
Based in Brea, 9 mi away
51/100LFR ScoreRanked #25 because of its Google rating and practice area focus: 4.6★ from 33 Google reviews, listed on Google as “Law firm”.
Business lawyers ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in LFR Score order; each links to its profile. We publish the top 50 of 66 ranked business lawyers here; the rest are on their profiles.
Also serving Diamond Bar
20 more business lawyers within 25 mi that we can't rank yet: too few reviews, or a practice area we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Alex Ramirez, Esq. - AR | LEGAL TEAM | 4.6★ (49) | In Diamond Bar |
| ALL Trial Lawyers - Car Accident Attorneys | 5.0★ (11) | In Diamond Bar |
| Apex Lawyers | 4.6★ (45) | In Diamond Bar |
| Black Knight Legal - Pomona | 5.0★ (14) | In Diamond Bar |
| Braff Law Car Accident Personal Injury Lawyers | 5.0★ (34) | In Diamond Bar |
| Concord & Sage PC | 5.0★ (36) | In Diamond Bar |
| Desiree Dominguez Immigration Law Office | 4.9★ (35) | In Diamond Bar |
| DHF Law, P.C. | 4.7★ (77) | In Diamond Bar |
| Eric D. Davis, Attorney at Law | 4.8★ (18) | In Diamond Bar |
| JAMES WANG LAW | 5.0★ (850) | In Diamond Bar |
| Kenner Law Group, PLC | 4.8★ (49) | In Diamond Bar |
| LA OC Lawyers Group | 5.0★ (294) | In Diamond Bar |
| Law Office of Michael Yap | 4.5★ (13) | In Diamond Bar |
| Maximus Law | 5.0★ (17) | In Diamond Bar |
| Michael W. Brown, LLP Attorney at Law | 4.6★ (32) | In Diamond Bar |
| The Law Office of James Perez, Esq. | 5.0★ (86) | In Diamond Bar |
| The Pollard Firm, APC | 5.0★ (38) | In Diamond Bar |
| Weber Law | Criminal Defense Lawyers | 4.9★ (35) | In Diamond Bar |
| 黄笑生律师事务所 | 4.6★ (11) | In Diamond Bar |
| 黄笑生律师事务所总部 Law Huang International Ltd | 4.7★ (61) | In Diamond Bar |
How we ranked Diamond Bar business lawyers
We scored 66 Diamond Bar business lawyers on nine factors, weighted as shown. A law firm is ranked when its practice area is confirmed and it has 3 or more Google reviews or a claimed profile. A law firm with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed November 9, 2026.
Paid placement never changes a rank or score. Attorney advertising businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Diamond Bar data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Bar status | 10% | An active bar or law society record matched to a lawyer at the firm (not measured until a record source is loaded) | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed firm on the list | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly office hours, Saturday, Sunday, and phones answered 24/7 | Measured |
| Practice focus | 15% | How clearly the firm practises this area (its Google category and name) | Measured |
| Proximity | 5% | An office in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The firm has claimed its Law Firms Ranked profile (free and paid earn the same) | Measured |
| Law Firms Ranked reviews | 10% | Verified client reviews collected by Law Firms Ranked: their rating and how many there are | Measured |
How to choose a business lawyer
- Check the lawyer’s status and any public discipline in the state bar or law society directory.
- Ask how many business law matters the lawyer handles each year, and who at the firm will do the work.
- Get the fee arrangement in writing: hourly, flat or contingency, and which costs are charged on top.
- Ask how and how often the firm will update you, and how fast it answers calls and emails.
- Read recent reviews for how the firm communicated and billed, not only for outcomes.
- Ask for a written estimate or flat fee for a defined piece of work before it starts.
- Meet more than one firm; many offer a short first consultation, sometimes free.
Questions to ask a business lawyer
- How would you approach a matter like mine, and what are the realistic options?
- How do you charge, and what will the total likely cost?
- Who will be my main contact, and how quickly do you reply?
- Which of my contracts most need a review?
- Can you work on a flat fee or a monthly retainer?
- Is there any conflict of interest that would stop you representing me?
Terms explained
- Contingency fee
- A fee that is a share of the money recovered, paid only if there is a recovery. Common in injury cases; not allowed for criminal defense or for securing a divorce.
- Retainer
- Money paid up front and held in a trust account, which the lawyer draws on as fees are earned.
- Flat fee
- One set price for a defined piece of work, such as a will or an uncontested matter.
- Limited-scope representation
- Paying a lawyer for part of a matter only, such as reviewing documents or coaching for one hearing (also called unbundled services).
- Statute of limitations
- The deadline to file a lawsuit or charge. It differs by state or province and by type of claim.
- Good standing
- A lawyer’s status as active and eligible to practise with a state bar or law society.
- Law society
- The body that licenses and disciplines lawyers in a Canadian province or territory.
- Board certification
- Recognition in a field of law by a state program or an organisation accredited for that purpose. Lawyers may only claim it when they hold it, naming the certifying body.
- Attorney–client privilege
- The rule that keeps confidential communications between a client and lawyer, made for legal advice, out of court.
- Conflict check
- The search a firm runs before taking a matter to make sure it does not represent someone on the other side.
- Pro bono
- Legal work done for free, usually for people who cannot afford a lawyer.
- Legal aid
- Publicly funded legal help for people with low incomes, through legal aid offices, public defenders or provincial legal aid plans.
Business lawyers in Diamond Bar: frequently asked questions
Which business lawyer has the highest LFR Score in Diamond Bar?
By LFR Score, the highest-ranked business lawyer in Diamond Bar, CA is Sari Law Firm with an LFR Score of 63/100. It has 5.0★ from 134 Google reviews. It is open Saturdays until 5 PM. Adams Corporate Law, Inc. (#2) and Luther Lanard, PC (#3) follow. We ranked 66 business lawyers on nine factors, last updated November 9, 2026.
How many business lawyers are there in Diamond Bar?
LawFirmsRanked ranks 66 business lawyers serving Diamond Bar, CA. 3 of them are based in Diamond Bar; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which business lawyers in Diamond Bar are open 24/7?
7 ranked business lawyers in Diamond Bar post 24/7 hours. The highest-ranked are Luther Lanard, PC (#3), Morgan & Morgan (#7) and Counts Law Firm PC (#9). Hours come from each law firm's Google listing as of November 2026, so call to confirm.
Which business lawyers in Diamond Bar work on weekends?
13 of 66 ranked business lawyers post Saturday hours and 9 post Sunday hours. The highest-ranked open Saturdays are Sari Law Firm (#1), Adams Corporate Law, Inc. (#2) and Luther Lanard, PC (#3). Posted hours are office hours; many firms meet clients by appointment outside them.
What Google rating do Diamond Bar business lawyers have?
The median Google rating among 66 rated business lawyers in Diamond Bar is 4.8★, with a median of 18 reviews. Morgan & Morgan has the most, 448 reviews, and ranks #7. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does LawFirmsRanked rank business lawyers?
Each business lawyer gets a 0–100 LFR Score from nine published factors, led by reputation (25%), practice focus (15%), review volume (10%) and recency (10%). A law firm with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only law firms with a confirmed practice area and 3 or more reviews, or a claimed profile, are ranked.
Do business lawyers outside Diamond Bar count in this ranking?
Yes, if they are within 25 mi of the Diamond Bar city center, our service radius for business lawyers. Each listing shows where the law firm is based and how far away it is. Proximity is 5% of the LFR Score, so a nearby law firm gets a small edge.
Can business lawyers pay to rank higher on LawFirmsRanked?
No. The LFR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured law firms may appear above the list, labelled Attorney advertising and showing their honest rank.
How do business lawyers in Diamond Bar, CA charge?
Business lawyers bill hourly for disputes and complex deals and often offer flat fees for company formation, standard contracts or a monthly general counsel arrangement. Lawyers using Clio billed an average of $400 an hour in this area (Clio Legal Trends data, October 2026; all areas $362). Ask for the fee arrangement in writing before you agree.
When should a small business talk to a lawyer?
Common points are choosing a business structure, partner or shareholder agreements, signing a lease or major contract, buying or selling a business, and when a dispute starts. This is general information, not legal advice.
How is this list of business lawyers in Diamond Bar, CA ranked?
By LFR Score only, from public data on reviews, practice focus, office location and hours. Firms labelled “Attorney advertising” paid for that placement; payment never changes a rank, and a rank is not an endorsement.
Does a lawyer need an office in Diamond Bar?
No, but the lawyer must be licensed in your state (or, for federal matters such as immigration, in some state). A local office makes meetings and court appearances easier, so proximity is one of our factors.
Update log for Diamond Bar
- November 2026: LFR Scores recalculated for 66 business lawyers serving Diamond Bar.
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