60/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 434 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Excavating Contractors in Diamond Bar, CA (2026)
67 excavating contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Diamond Bar: Roto-Rooter Plumbing & Water Cleanup, CR Score 60/100; 4.9★ from 434 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Roto-Rooter Plumbing & Water Cleanup, posts 24/7 hours; ranked #2 of 67.
- 2
Most-reviewed: Roto-Rooter Plumbing & Water Cleanup, 1,330 Google reviews at 4.8★, the most of 67 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
67 Diamond Bar excavating contractors are ranked here by CR Score, from ten published factors. 21 are open 24/7, 39 open Saturdays and 34 open Sundays, based on posted hours. The median Google rating is 4.9★ across 67 rated businesses.
Top 10 excavating contractors in Diamond Bar at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Roto-Rooter Plumbing & Water Cleanup | 60 | 4.9★ (434) | Diamond Bar | 24/7 | Overall |
| 2 | Roto-Rooter Plumbing & Water Cleanup | 59 | 4.8★ (1,330) | Ontario, 9 mi away | 24/7 | Emergencies, Most reviews |
| 3 | Roto-Rooter Plumbing & Water Cleanup | 58 | 4.9★ (375) | Rowland Heights, 5 mi away | 24/7 | — |
| 4 | Roto-Rooter Plumbing & Water Cleanup | 57 | 4.8★ (936) | Corona, 16 mi away | 24/7 | — |
| 5 | Roto-Rooter Plumbing & Water Cleanup | 57 | 4.9★ (436) | Fullerton, 13 mi away | 24/7 | — |
| 6 | Roto-Rooter Plumbing & Water Cleanup | 56 | 4.8★ (450) | Anaheim, 13 mi away | 24/7 | — |
| 7 | Roto-Rooter Plumbing & Water Cleanup | 56 | 4.9★ (504) | Orange, 17 mi away | 24/7 | — |
| 8 | Roto-Rooter Plumbing & Water Cleanup | 56 | 4.8★ (1,128) | Alhambra, 20 mi away | 24/7 | — |
| 9 | Roto-Rooter Plumbing & Water Cleanup | 56 | 4.9★ (736) | Pasadena, 21 mi away | 24/7 | — |
| 10 | Applied Earth Works Inc | 55 | 5.0★ (6) | Hemet, 15 mi away | 24/7 | — |
The 67 best excavating contractors in Diamond Bar, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Ontario, 9 mi away
59/100CR ScoreRanked #2 because of its Google rating and review volume: 4.8★ from 1,330 Google reviews, the most in Diamond Bar.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Rowland Heights, 5 mi away
58/100CR ScoreRanked #3 because of its Google rating and review volume: 4.9★ from 375 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Corona, 16 mi away
57/100CR ScoreRanked #4 because of its Google rating and review volume: 4.8★ from 936 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Fullerton, 13 mi away
57/100CR ScoreRanked #5 because of its Google rating and review volume: 4.9★ from 436 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Anaheim, 13 mi away
56/100CR ScoreRanked #6 because of its Google rating and review volume: 4.8★ from 450 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Orange, 17 mi away
56/100CR ScoreRanked #7 because of its Google rating and review volume: 4.9★ from 504 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Alhambra, 20 mi away
56/100CR ScoreRanked #8 because of its Google rating and review volume: 4.8★ from 1,128 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pasadena, 21 mi away
56/100CR ScoreRanked #9 because of its Google rating and review volume: 4.9★ from 736 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hemet, 15 mi away
55/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Commerce, 20 mi away
55/100CR ScoreRanked #11 because of its Google rating and review volume: 4.9★ from 417 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Westminster, 22 mi away
54/100CR ScoreRanked #12 because of its Google rating and review volume: 4.9★ from 380 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pomona, 3 mi away
54/100CR ScoreRanked #13 because of its Google rating and trade focus: 3.4★ from 10 Google reviews, listed on Google as “Excavating contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Phelan, 10 mi away
54/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Phelan, 10 mi away
54/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Ana, 23 mi away
54/100CR ScoreRanked #16 because of its Google rating and review volume: 4.8★ from 438 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Riverside, 25 mi away
53/100CR ScoreRanked #17 because of its Google rating and review volume: 4.8★ from 495 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pomona, 5 mi away
53/100CR ScoreRanked #18 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Excavating contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Rancho Cucamonga, 13 mi away
53/100CR ScoreRanked #19 because of its Google rating and review volume: 4.8★ from 65 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#20 Dreyfuss Grading
Based in Camp Pendleton South, 10 mi away
53/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “Roofing contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ontario, 9 mi away
53/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.0★ from 4 Google reviews, listed on Google as “Excavating contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Calimesa, 22 mi away
52/100CR ScoreRanked #22 because of its Google rating and review volume: 5.0★ from 100 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#23 R3 Contractors
Based in Anaheim, 13 mi away
52/100CR ScoreRanked #23 because of its Google rating and trade focus: 3.8★ from 13 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Brea, 9 mi away
52/100CR ScoreRanked #24 because of its Google rating and trade focus: 3.0★ from 4 Google reviews, listed on Google as “Excavating contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Riverside, 21 mi away
52/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Excavating contractors ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 67 ranked excavating contractors here; the rest are on their profiles.
Also serving Diamond Bar
20 more excavating contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
How we ranked Diamond Bar excavating contractors
We scored 67 Diamond Bar excavating contractors on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business 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 3, 2026.
Paid placement never changes a rank or score. Featured 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 |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |
Excavating contractors in Diamond Bar: frequently asked questions
Who is the best excavating contractor in Diamond Bar?
By CR Score, the highest-ranked excavating contractor in Diamond Bar, CA is Roto-Rooter Plumbing & Water Cleanup with a CR Score of 60/100. It has 4.9★ from 434 Google reviews. It is open 24/7. Roto-Rooter Plumbing & Water Cleanup (#2) and Roto-Rooter Plumbing & Water Cleanup (#3) follow. We ranked 67 excavating contractors on ten factors, last updated November 3, 2026.
How many excavating contractors are there in Diamond Bar?
ContractorsRanked ranks 67 excavating contractors serving Diamond Bar, CA. 1 of them is 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 excavating contractors in Diamond Bar are open 24/7?
21 ranked excavating contractors in Diamond Bar post 24/7 hours. The highest-ranked are Roto-Rooter Plumbing & Water Cleanup (#1), Roto-Rooter Plumbing & Water Cleanup (#2) and Roto-Rooter Plumbing & Water Cleanup (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which excavating contractors in Diamond Bar work on weekends?
39 of 67 ranked excavating contractors post Saturday hours and 34 post Sunday hours. The highest-ranked open Saturdays are Roto-Rooter Plumbing & Water Cleanup (#1), Roto-Rooter Plumbing & Water Cleanup (#2) and Roto-Rooter Plumbing & Water Cleanup (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Diamond Bar excavating contractors have?
The median Google rating among 67 rated excavating contractors in Diamond Bar is 4.9★, with a median of 8 reviews. Roto-Rooter Plumbing & Water Cleanup has the most, 1,330 reviews, and ranks #2. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank excavating contractors?
Each excavating contractor gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do excavating contractors outside Diamond Bar count in this ranking?
Yes, if they are within 25 mi of the Diamond Bar city center, our service radius for excavating contractors. Each listing shows where the business is based and how far away it is. Proximity is 5% of the CR Score, so a nearby business gets a small edge.
Can excavating contractors pay to rank higher on ContractorsRanked?
No. The CR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured businesses may appear above the list, labelled Featured and showing their honest rank.
Update log for Diamond Bar
- November 2026: CR Scores recalculated for 67 excavating contractors serving Diamond Bar.
- November 2026: 1 duplicate listing merged.
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