90/100CR Score
Ranked #1 because of its Google rating and availability: 4.9★ from 859 Google reviews, open 24/7.
- 4.9★ from 859 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1571 S Sunkist St Suite H, Anaheim, CA 92806
Best Insulation Contractors in Diamond Bar, CA (2026)
199 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Diamond Bar: CURA Termite and Pest Control, CR Score 90/100; 4.9★ from 859 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Gopher Patrol, posts 24/7 hours; ranked #2 of 199.
- 18
Most-reviewed: RighTime Home Services, 3,741 Google reviews at 4.7★, the most of 199 ranked; ranked #18.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
199 Diamond Bar insulation contractors are ranked here by CR Score, from 8 published factors. 27 are open 24/7, 150 open Saturdays and 127 open Sundays, based on posted hours. The median Google rating is 5.0★ across 199 rated businesses.
Top 10 insulation contractors in Diamond Bar at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | CURA Termite and Pest Control | 90 | 4.9★ (859) | Anaheim, 16 mi away | 24/7 | Overall |
| 2 | Gopher Patrol | 86 | 4.9★ (182) | Riverside, 20 mi away | 24/7 | Emergencies |
| 3 | Attic Projects | 86 | 4.9★ (584) | Orange, 16 mi away | Sat · Sun · Evenings | — |
| 4 | Insulation Labs | 85 | 5.0★ (135) | Fullerton, 11 mi away | Sat · Sun · Evenings | — |
| 5 | Attic Projects | 85 | 5.0★ (168) | Rancho Cucamonga, 15 mi away | Sat · Sun · Evenings | — |
| 6 | Priority Attic Insulation | 84 | 4.6★ (47) | Glendora, 7 mi away | 24/7 | — |
| 7 | Brad's Insulation | 84 | 4.9★ (94) | Azusa, 10 mi away | Sat · Sun · Evenings | — |
| 8 | NexGen HVAC & Plumbing | 84 | 4.7★ (2,250) | Anaheim, 12 mi away | 24/7 | — |
| 9 | All | 83 | 4.9★ (27) | San Dimas, 6 mi away | Sat · Sun · Evenings | — |
| 10 | SoCal Comfort Shield Insulation | 83 | 5.0★ (25) | Montclair, 7 mi away | Sat · Sun · Evenings | — |
The 199 best insulation contractors in Diamond Bar, ranked
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Riverside, 20 mi away
86/100CR ScoreRanked #2 because of its Google rating and availability: 4.9★ from 182 Google reviews, open 24/7.
- 4.9★ from 182 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 12155 Magnolia Ave Ste. 10B, Riverside, CA 92503
Based in Orange, 16 mi away
86/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 584 Google reviews, listed on Google as “Insulation contractor”.
- 4.9★ from 584 Google reviews
- Hours
- Mon–Fri 7 AM–8 PM · Sat 8 AM–6 PM · Sun 7 AM–8 PM
- Address
- 1607 W Orange Grove Ave Suite A, Orange, CA 92868
Based in Fullerton, 11 mi away
85/100CR ScoreRanked #4 because of its Google rating and trade focus: 5.0★ from 135 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 135 Google reviews
- Hours
- Mon–Fri 8 AM–6:30 PM · Sat–Sun 8 AM–4:30 PM
- Address
- 1038 E Bastanchury Rd #141, Fullerton, CA 92835
Based in Rancho Cucamonga, 15 mi away
85/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 168 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 168 Google reviews
- Hours
- Mon–Fri 7 AM–8 PM · Sat 8 AM–6 PM · Sun 7 AM–8 PM
- Address
- 8690 Red Oak St, Rancho Cucamonga, CA 91730
Based in Glendora, 7 mi away
84/100CR ScoreRanked #6 because of its Google rating and availability: 4.6★ from 47 Google reviews, open 24/7.
- 4.6★ from 47 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1030 E Rte 66, Glendora, CA 91740
Based in Azusa, 10 mi away
84/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.9★ from 94 Google reviews, listed on Google as “Insulation contractor”.
- 4.9★ from 94 Google reviews
- Hours
- Mon–Sun 6 AM–7 PM
- Address
- 1349 N Alameda Ave, Azusa, CA 91702
Based in Anaheim, 12 mi away
84/100CR ScoreRanked #8 because of its Google rating and availability: 4.7★ from 2,250 Google reviews, open 24/7.
- 4.7★ from 2,250 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5472 E La Palma Ave, Anaheim, CA 92807
#9 All
Based in San Dimas, 6 mi away
83/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.9★ from 27 Google reviews, listed on Google as “Insulation contractor”.
- 4.9★ from 27 Google reviews
- Hours
- Mon–Sun 8 AM–10 PM
- Address
- 1453 W Arrow Hwy, San Dimas, CA 91773
Based in Montclair, 7 mi away
83/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 25 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 25 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 4700 Brooks St, Montclair, CA 91763
Based in Covina, 6 mi away
83/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.8★ from 31 Google reviews, listed on Google as “Insulation contractor”.
- 4.8★ from 31 Google reviews
- Hours
- Mon–Fri 8 AM–9 PM · Sat 7 AM–8 PM · Sun 8 AM–10 PM
- Address
- 1343 N Grand Ave A, Covina, CA 91724
#12 Rodent Free
Based in Santa Ana, 20 mi away
82/100CR ScoreRanked #12 because of its Google rating and availability: 5.0★ from 22 Google reviews, open 24/7.
- 5.0★ from 22 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 600 W Santa Ana Blvd Ste 114a #240, Santa Ana, CA 92701
#13 Tiger Foam
Based in La Puente, 8 mi away
82/100CR ScoreRanked #13 because of its Google rating and availability: 4.0★ from 8 Google reviews, open 24/7.
- 4.0★ from 8 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 15900 Main St, La Puente, CA 91744
Based in Riverside, 20 mi away
82/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.9★ from 155 Google reviews, listed on Google as “Insulation contractor”.
- 4.9★ from 155 Google reviews
- Hours
- Mon–Thu 7 AM–8 PM · Fri 7 AM–7 PM · Sat–Sun 7 AM–8 PM
- Address
- 4193 Flat Rock Rd suite 200, Riverside, CA 92505
Based in Pomona, 5 mi away
82/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 14 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 1649 E Mission Blvd, Pomona, CA 91766
Based in Artesia, 19 mi away
82/100CR ScoreRanked #16 because of its Google rating and availability: 4.8★ from 51 Google reviews, open 24/7.
- 4.8★ from 51 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 18173 Pioneer Blvd, Artesia, CA 90701
Based in Fullerton, 12 mi away
82/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.9★ from 44 Google reviews, listed on Google as “Insulation contractor”.
- 4.9★ from 44 Google reviews
- Hours
- Mon–Fri 7 AM–8 PM · Sat 7 AM–7 PM · Sun 7 AM–8 PM
- Address
- 2461 Orangethorpe Ave #231, Fullerton, CA 92831
Based in Corona, 23 mi away
82/100CR ScoreRanked #18 because of its Google rating and review volume: 4.7★ from 3,741 Google reviews, the most Google reviews on this list (3,741).
- 4.7★ from 3,741 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3959 Temescal Canyon Rd, Corona, CA 92883
Based in Chino, 5 mi away
82/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.7★ from 20 Google reviews, listed on Google as “Insulation contractor”.
- 4.7★ from 20 Google reviews
- Hours
- Mon–Sun 7 AM–8 PM
- Address
- 11924 Del Mar Ave, Chino, CA 91710
Based in Placentia, 12 mi away
82/100CR ScoreRanked #20 because of its Google rating and trade focus: 5.0★ from 29 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 29 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 981 S Vía Rodeo, Placentia, CA 92870
Based in Arcadia, 12 mi away
82/100CR ScoreRanked #21 because of its Google rating and availability: 4.7★ from 538 Google reviews, open 24/7.
- 4.7★ from 538 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5441 Cogswell Rd Unit F, Arcadia, CA 91006
Based in Fontana, 18 mi away
81/100CR ScoreRanked #22 because of its Google rating and availability: 4.8★ from 708 Google reviews, open 24/7.
- 4.8★ from 708 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 10820 Mulberry Ave, Fontana, CA 92337
Based in Placentia, 11 mi away
81/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 23 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 23 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 377 E Chapman Ave, Placentia, CA 92870
Based in Fullerton, 14 mi away
81/100CR ScoreRanked #24 because of its Google rating and trade focus: 5.0★ from 29 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 29 Google reviews
- Hours
- Mon–Sun 7 AM–8 PM
- Address
- 1303 W Valencia Dr #233, Fullerton, CA 92833
Based in West Covina, 6 mi away
81/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 10 Google reviews
- Hours
- Mon–Sun 7 AM–8 PM
- Address
- 1519 E Amar Rd, West Covina, CA 91792
Insulation 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 199 ranked insulation contractors here; the rest are on their profiles.
Also serving Diamond Bar
20 more insulation contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| ALCAL Specialty Contracting Ontario - Home Service Division | 3.0★ (2) | 15 mi |
| All Star Install LLC | 5.0★ (2) | 13 mi |
| Bob Mezzo Plastering | 5.0★ (2) | 13 mi |
| Budget Air Conditioning & Heating | In Diamond Bar | |
| Builders' Insulation | 5.0★ (2) | 18 mi |
| Canyon Insulation Inc | 5.0★ (2) | 18 mi |
| Contractor Monrovia Redzone | 5.0★ (2) | 14 mi |
| Fireproofing Cleaning Service | 4.5★ (2) | 18 mi |
| Kiko's insulation corporation | 5.0★ (2) | 10 mi |
| Lone Star | 5.0★ (2) | 10 mi |
| NDM Insulation | 5.0★ (2) | 19 mi |
| Performance Contracting Inc | 5.0★ (2) | 12 mi |
| QUALITY FOAM | 5.0★ (2) | 9 mi |
| Semper fi Handyman | 2.5★ (2) | 6 mi |
| Smart Value Insulation | 5.0★ (2) | 11 mi |
| Socal Thermal Insulation / EXCELLENCE AWARD | 3.0★ (2) | 20 mi |
| Thermal Energy Products | 3.0★ (2) | 15 mi |
| Thermal Nest Insulation of Anaheim | 5.0★ (2) | 13 mi |
| Vasitos Construction | 5.0★ (2) | 8 mi |
| Western Industrial Ceramics | 5.0★ (2) | 15 mi |
How much do insulation contractors cost in Diamond Bar?
National price ranges in USD, not adjusted for Diamond Bar. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Attic insulation | $1,700 | $2,100 | $2,500 | Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range | October 2026 |
How we ranked Diamond Bar insulation contractors
We scored 199 Diamond Bar insulation contractors on 8 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. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 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 | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |
Insulation contractors in Diamond Bar: frequently asked questions
Who is the best insulation contractor in Diamond Bar?
By CR Score, the highest-ranked insulation contractor in Diamond Bar, CA is CURA Termite and Pest Control with a CR Score of 90/100. It has 4.9★ from 859 Google reviews. It is open 24/7. Gopher Patrol (#2) and Attic Projects (#3) follow. We ranked 199 insulation contractors on 8 factors, last updated October 22, 2026.
How many insulation contractors are there in Diamond Bar?
ContractorsRanked ranks 199 insulation contractors serving Diamond Bar, CA. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which insulation contractors in Diamond Bar are open 24/7?
27 ranked insulation contractors in Diamond Bar post 24/7 hours. The highest-ranked are CURA Termite and Pest Control (#1), Gopher Patrol (#2) and Priority Attic Insulation (#6). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which insulation contractors in Diamond Bar work on weekends?
150 of 199 ranked insulation contractors post Saturday hours and 127 post Sunday hours. The highest-ranked open Saturdays are CURA Termite and Pest Control (#1), Gopher Patrol (#2) and Attic Projects (#3). Posted hours are office hours; crews may book weekend jobs separately.
How much does attic insulation cost in Diamond Bar?
Attic insulation typically costs $1,700 to $2,500, with $2,100 typical (Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range). This is a national range, not adjusted for Diamond Bar. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Diamond Bar insulation contractors have?
The median Google rating among 199 rated insulation contractors in Diamond Bar is 5.0★, with a median of 20 reviews. RighTime Home Services has the most, 3,741 reviews, and ranks #18. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank insulation contractors?
Each insulation contractor gets a 0–100 CR Score from 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do insulation 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 insulation 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.
Update log for Diamond Bar
- October 2026: CR Scores recalculated for 199 insulation contractors serving Diamond Bar.
- October 2026: 1 duplicate listing merged.
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