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ContractorsRanked

Best Insulation Contractors in Castro Valley, CA (2026)

138 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Castro Valley: Attic Pros, CR Score 92/100; 4.8★ from 1,938 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Pro Attic Restoration, posts 24/7 hours; ranked #2 of 138.

  3. 13

    Most-reviewed: Service Champions, 5,220 Google reviews at 4.9★, the most of 138 ranked; ranked #13.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

138 Castro Valley insulation contractors are ranked here by CR Score, from 8 published factors. 42 are open 24/7, 94 open Saturdays and 82 open Sundays, based on posted hours. The median Google rating is 4.9★ across 138 rated businesses.

Top 10 insulation contractors in Castro Valley at a glance

Top 10 insulation contractors in Castro Valley at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Attic Pros924.8★ (1,938)Oakland, 6 mi away24/7Overall
2Pro Attic Restoration894.9★ (48)Hayward, 1 mi away24/7Emergencies
3EcoGuard Pest Management884.9★ (279)Dublin, 3 mi awaySat · Sun · Evenings—
4American Attic885.0★ (219)Oakland, 5 mi awaySat · Sun—
5Atticare USA874.8★ (439)San Leandro, 4 mi awaySat · Sun · Evenings—
6Rywen Insulation Inc.875.0★ (151)San Leandro, 6 mi awaySat · Sun—
7Alamo Attic Insulation Pro864.9★ (94)Alamo, 11 mi away24/7—
8Miller Attics855.0★ (46)Walnut Creek, 15 mi away24/7—
9Service Champions854.9★ (4,721)Livermore, 16 mi away24/7—
10Service Champions854.8★ (2,337)Pleasanton, 9 mi away24/7—

The 138 best insulation contractors in Castro Valley, 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.

  1. Ranked #1 in Castro Valley

    #1 Attic Pros

    Based in Oakland, 6 mi away

    92/100CR Score

    Ranked #1 because of its Google rating and availability: 4.8★ from 1,938 Google reviews, open 24/7.

    • 4.8★ from 1,938 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    718 Douglas Ave, Oakland, CA 94603
    View profile for Attic Pros(800) 543-0382

  4. #4 American Attic

    Based in Oakland, 5 mi away

    88/100CR Score

    Ranked #4 because of its Google rating and trade focus: 5.0★ from 219 Google reviews, listed on Google as “Insulation contractor”.

    • 5.0★ from 219 Google reviews
    Hours
    Mon–Sun 7 AM–6 PM
    Address
    2721 106th Ave, Oakland, CA 94605
    View profile for American Attic(800) 461-2017

  5. #5 Atticare USA

    Based in San Leandro, 4 mi away

    87/100CR Score

    Ranked #5 because of its Google rating and trade focus: 4.8★ from 439 Google reviews, listed on Google as “Insulation contractor”.

    • 4.8★ from 439 Google reviews
    Hours
    Mon–Fri 8 AM–7 PM · Sat–Sun 9 AM–6 PM
    Address
    303 W Joaquin Ave Unit #103, San Leandro, CA 94577
    View profile for Atticare USA(866) 647-2811

  6. #6 Rywen Insulation Inc.

    Based in San Leandro, 6 mi away

    87/100CR Score

    Ranked #6 because of its Google rating and trade focus: 5.0★ from 151 Google reviews, listed on Google as “Insulation contractor”.

    • 5.0★ from 151 Google reviews
    Hours
    Mon–Sat 8 AM–6 PM · Sun 9 AM–4 PM
    Address
    456 Hester St, San Leandro, CA 94577
    View profile for Rywen Insulation Inc.(415) 770-0342

  8. #8 Miller Attics

    Based in Walnut Creek, 15 mi away

    85/100CR Score

    Ranked #8 because of its Google rating and availability: 5.0★ from 46 Google reviews, open 24/7.

    • 5.0★ from 46 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    161 N Civic Dr, Walnut Creek, CA 94596
    View profile for Miller Attics(510) 447-6507

  10. #10 Service Champions

    Based in Pleasanton, 9 mi away

    85/100CR Score

    Ranked #10 because of its Google rating and availability: 4.8★ from 2,337 Google reviews, open 24/7.

    • 4.8★ from 2,337 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    7020 Commerce Dr, Pleasanton, CA 94588
    View profile for Service Champions(925) 248-3458

  13. #13 Service Champions

    Based in Martinez, 22 mi away

    84/100CR Score

    Ranked #13 because of its Google rating and review volume: 4.9★ from 5,220 Google reviews, the most Google reviews on this list (5,220).

    • 4.9★ from 5,220 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    261 Arthur Rd, Martinez, CA 94553
    View profile for Service Champions(925) 281-0532

  15. #15 Service Champions

    Based in Livermore, 16 mi away

    84/100CR Score

    Ranked #15 because of its Google rating and availability: 4.9★ from 1,331 Google reviews, open 24/7.

    • 4.9★ from 1,331 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    96 Rickenbacker Cir, Livermore, CA 94551
    View profile for Service Champions(925) 397-4867

  17. #17 Attic Star

    Based in Redwood City, 17 mi away

    83/100CR Score

    Ranked #17 because of its Google rating and trade focus: 4.9★ from 156 Google reviews, listed on Google as “Insulation contractor”.

    • 4.9★ from 156 Google reviews
    Hours
    Mon–Thu 7 AM–7:30 PM · Fri 7 AM–6 PM · Sat–Sun 7 AM–7:30 PM
    Address
    2847 Middlefield Rd, Redwood City, CA 94063
    View profile for Attic Star(800) 444-8180

  18. #18 Service Champions

    Based in San Jose, 23 mi away

    83/100CR Score

    Ranked #18 because of its Google rating and availability: 4.9★ from 3,407 Google reviews, open 24/7.

    • 4.9★ from 3,407 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    2161 Del Franco St, San Jose, CA 95131
    View profile for Service Champions(408) 549-7376

  19. #19 Attic Elite

    Based in Newark, 11 mi away

    83/100CR Score

    Ranked #19 because of its Google rating and trade focus: 4.9★ from 474 Google reviews, listed on Google as “Insulation contractor”.

    • 4.9★ from 474 Google reviews
    Hours
    Mon–Fri 8 AM–6 PM · Sat closed · Sun 8 AM–6 PM
    Address
    37310 Cedar Blvd Suite H, Newark, CA 94560
    View profile for Attic Elite(888) 805-8848

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 138 ranked insulation contractors here; the rest are on their profiles.

insulation contractors in Castro Valley, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Bears Restoration824.7★ (14)16 mi
27Next Edge Insulation825.0★ (3)12 mi
28911 Attic Insulation825.0★ (19)23 mi
29Rodent Exclusion Pro Oakland, CA824.8★ (18)8 mi
30Insulation Labs825.0★ (6)4 mi
31Richmond Insulation Pros825.0★ (4)14 mi
32American Attics815.0★ (89)11 mi
33Eagle Air814.9★ (549)20 mi
34Fire Damage Squad814.6★ (5)17 mi
35TRIO Heating, Air & Plumbing814.9★ (1,142)25 mi
36Attic Repair Guys815.0★ (23)16 mi
37Freschi Service Experts804.8★ (1,046)22 mi
38Trap Guard805.0★ (13)20 mi
39EcoGuard Pest Management804.8★ (1,198)21 mi
40Attic Insulation Patrol803.4★ (5)16 mi
41NorCal Roofing & Construction805.0★ (24)6 mi
42Delta Spray Foam Insulation805.0★ (34)21 mi
43Alley Cat804.9★ (1,071)14 mi
44AJ Heating & Cooling Inc.805.0★ (32)6 mi
45Patriots Restoration805.0★ (6)11 mi
46Daly City Restoration794.0★ (4)20 mi
47The Bay Area Insulation795.0★ (9)15 mi
48ATTIC RENEW 360794.8★ (32)8 mi
49Spotlight Roofing Inc795.0★ (66)16 mi
50Attic Perfect794.1★ (78)6 mi

Also serving Castro Valley

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.

Unranked insulation contractors serving Castro Valley
BusinessGoogle ratingDistance
Airseal Inc3.0★ (2)23 mi
Attic Bros of Milpitas5.0★ (2)21 mi
Attic Solutions3.0★ (2)16 mi
Attic Wise Cleaning5.0★ (2)19 mi
B.A. Morrison General Contractor4.1★ (30)In Castro Valley
Bear Insulation and Services5.0★ (2)19 mi
Brandon's Attic Control5.0★ (2)9 mi
Brick & Hammer5.0★ (2)16 mi
Canyon Insulation Inc5.0★ (2)20 mi
Emerald Insulation & Acoustical Inc.5.0★ (2)19 mi
Insulation & Air Duct Crew5.0★ (2)3 mi
My Steam Rug & Sofa Cleaning5.0★ (2)19 mi
Panda Heating & Cooling3.5★ (2)6 mi
Peak Core Insulation5.0★ (2)13 mi
Performance Contracting Inc1.0★ (2)21 mi
Prime Air Duct Cleaning5.0★ (2)21 mi
PRO ATTIC RESTORATION5.0★ (2)1 mi
Pro Insulation & RodentsIn Castro Valley
Quality Pro Guard1.0★ (2)22 mi
Wonderlin Roofing Systems4.6★ (14)In Castro Valley

How much do insulation contractors cost in Castro Valley?

National price ranges in USD, not adjusted for Castro Valley. Each row names its basis and the month we checked it.

How much do insulation contractors cost in Castro Valley?
JobLowTypicalHighBasisChecked
Attic insulation$1,700$2,100$2,500Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national rangeOctober 2026

How we ranked Castro Valley insulation contractors

We scored 138 Castro Valley 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Castro Valley data
Reputation35%Bayesian-adjusted Google star ratingMeasured
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2Not yet collected
Review volume10%log10(reviews + 1) against the list maximumMeasured
Recency10%Share of reviews from the last 12 monthsNot yet collected
Availability10%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5Measured
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radiusMeasured
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)Measured

Insulation contractors in Castro Valley: frequently asked questions

Who is the best insulation contractor in Castro Valley?

By CR Score, the highest-ranked insulation contractor in Castro Valley, CA is Attic Pros with a CR Score of 92/100. It has 4.8★ from 1,938 Google reviews. It is open 24/7. Pro Attic Restoration (#2) and EcoGuard Pest Management (#3) follow. We ranked 138 insulation contractors on 8 factors, last updated October 22, 2026.

How many insulation contractors are there in Castro Valley?

ContractorsRanked ranks 138 insulation contractors serving Castro Valley, CA. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.

Which insulation contractors in Castro Valley are open 24/7?

42 ranked insulation contractors in Castro Valley post 24/7 hours. The highest-ranked are Attic Pros (#1), Pro Attic Restoration (#2) and Alamo Attic Insulation Pro (#7). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which insulation contractors in Castro Valley work on weekends?

94 of 138 ranked insulation contractors post Saturday hours and 82 post Sunday hours. The highest-ranked open Saturdays are Attic Pros (#1), Pro Attic Restoration (#2) and EcoGuard Pest Management (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does attic insulation cost in Castro Valley?

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 Castro Valley. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Castro Valley insulation contractors have?

The median Google rating among 138 rated insulation contractors in Castro Valley is 4.9★, with a median of 24 reviews. Service Champions has the most, 5,220 reviews, and ranks #13. 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 Castro Valley count in this ranking?

Yes, if they are within 25 mi of the Castro Valley 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 Castro Valley

  1. October 2026: CR Scores recalculated for 138 insulation contractors serving Castro Valley.
  2. October 2026: 1 duplicate listing merged.

More insulation contractors and Castro Valley pages

Other trades in Castro Valley