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Best Insulation Contractors in Los Altos, CA (2026)

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

The short answer

  1. 1

    Best overall in Los Altos: Attic Pros, CR Score 88/100; 4.8★ from 1,938 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Reactic Restoration, posts 24/7 hours; ranked #2 of 85.

  3. 3

    Most-reviewed: Service Champions, 3,407 Google reviews at 4.9★, the most of 85 ranked; ranked #3.

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

85 Los Altos insulation contractors are ranked here by CR Score, from 8 published factors. 30 are open 24/7, 63 open Saturdays and 60 open Sundays, based on posted hours. The median Google rating is 5.0★ across 85 rated businesses.

Top 10 insulation contractors in Los Altos at a glance

Top 10 insulation contractors in Los Altos at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Attic Pros884.8★ (1,938)Oakland, 25 mi away24/7Overall
2Reactic Restoration875.0★ (16)Palo Alto, 3 mi away24/7Emergencies
3Service Champions874.9★ (3,407)San Jose, 12 mi away24/7Most reviews
4Attic Star864.9★ (156)Redwood City, 8 mi awaySat · Sun · Evenings—
5Los Gatos Top Insulation854.9★ (86)Los Gatos, 13 mi away24/7—
6Delta Spray Foam Insulation855.0★ (34)Mountain View, 2 mi awaySat · Sun · Evenings—
7Attic Pros854.7★ (104)San Jose, 16 mi away24/7—
8Trap Guard855.0★ (13)Redwood Shores, 4 mi away24/7—
9TRIO Heating, Air & Plumbing854.9★ (1,142)San Jose, 12 mi away24/7—
10911 Attic Insulation855.0★ (19)Fremont, 12 mi away24/7—

The 85 best insulation contractors in Los Altos, 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 Los Altos

    #1 Attic Pros

    Based in Oakland, 25 mi away

    88/100CR 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

  3. #3 Service Champions

    Based in San Jose, 12 mi away

    87/100CR Score

    Ranked #3 because of its Google rating and review volume: 4.9★ from 3,407 Google reviews, the most Google reviews on this list (3,407).

    • 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

  4. #4 Attic Star

    Based in Redwood City, 8 mi away

    86/100CR Score

    Ranked #4 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

  7. #7 Attic Pros

    Based in San Jose, 16 mi away

    85/100CR Score

    Ranked #7 because of its Google rating and availability: 4.7★ from 104 Google reviews, open 24/7.

    • 4.7★ from 104 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    3071 Monterey Rd suit b, San Jose, CA 95111
    View profile for Attic Pros(800) 543-0382

  8. #8 Trap Guard

    Based in Redwood Shores, 4 mi away

    85/100CR Score

    Ranked #8 because of its Google rating and availability: 5.0★ from 13 Google reviews, open 24/7.

    • 5.0★ from 13 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Trap Guard(669) 302-8041

  14. #14 Attic Elite

    Based in Newark, 12 mi away

    83/100CR Score

    Ranked #14 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

  16. #16 American Attic

    Based in Oakland, 25 mi away

    83/100CR Score

    Ranked #16 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

  17. #17 Atticare USA

    Based in San Leandro, 24 mi away

    83/100CR Score

    Ranked #17 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

  20. #20 Rywen Insulation Inc.

    Based in San Leandro, 24 mi away

    82/100CR Score

    Ranked #20 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

  22. #22 Service Champions

    Based in Pleasanton, 24 mi away

    82/100CR Score

    Ranked #22 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

  24. #24 Attic Repair Guys

    Based in Fremont, 12 mi away

    82/100CR Score

    Ranked #24 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–Sat 8 AM–5 PM · Sun 9 AM–2 PM
    Address
    3051 Quantum Dr #2411, Fremont, CA 94538
    View profile for Attic Repair Guys(415) 737-9844

  25. #25 Everlast Attic

    Based in San Jose, 13 mi away

    82/100CR Score

    Ranked #25 because of its Google rating and availability: 5.0★ from 7 Google reviews, open 24/7.

    • 5.0★ from 7 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1567 Alta Glen Dr suit 2, San Jose, CA 95125
    View profile for Everlast Attic(408) 981-5346

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

insulation contractors in Los Altos, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Regal Insulation Services825.0★ (31)15 mi
27Greenshield Insulation825.0★ (14)10 mi
28Newhaus Roofing & Construction814.9★ (148)12 mi
29AttiCal Insulation and Rodents815.0★ (11)10 mi
30Attic Masters Insulation Services815.0★ (7)15 mi
31Trio Heating & Air Hayward815.0★ (148)12 mi
32Pestfree Attic Cleaners Saratoga815.0★ (8)10 mi
33Reactic Restoration805.0★ (52)11 mi
34EcoGuard Pest Management804.8★ (570)9 mi
35Attic Bros of San Jose804.6★ (7)12 mi
36Fremont Insulation Pros795.0★ (6)12 mi
37Spotlight Roofing Inc795.0★ (66)17 mi
38Attic Solutions - Rodent Proofing & Insulation Services794.8★ (39)23 mi
39Bay Valley Insulation Inc794.0★ (4)12 mi
40Patriots Restoration795.0★ (6)14 mi
41The Bay Area Insulation795.0★ (9)17 mi
42Attic Team795.0★ (27)10 mi
43Next Edge Insulation795.0★ (3)24 mi
44All State Insulation785.0★ (25)13 mi
45Attic Bros, Inc.784.9★ (266)11 mi
46Eagle Insulation Inc.784.8★ (31)12 mi
47American Attics785.0★ (89)22 mi
48Atticguard Pro785.0★ (4)15 mi
49Bay Area Insulation Services Inc.785.0★ (7)4 mi
50AttiCity785.0★ (67)8 mi

Also serving Los Altos

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 Los Altos
BusinessGoogle ratingDistance
Attic Bros of Milpitas5.0★ (2)13 mi
Attic Insulation Remove & Install1.0★ (1)13 mi
Attic Total Cleaning & Proofing5.0★ (1)14 mi
Attic Wise Cleaning5.0★ (2)13 mi
Atticali of Sunnyvale5.0★ (1)5 mi
Bear Insulation and Services5.0★ (2)8 mi
Certified Pro Restorations, INC5.0★ (1)4 mi
Equinox Roofing Solutions5.0★ (1)10 mi
Insulation & Air Duct Crew5.0★ (2)19 mi
My Steam Rug & Sofa Cleaning5.0★ (2)6 mi
Panda Heating & Cooling3.5★ (2)25 mi
Premium Shield5.0★ (1)14 mi
PRO ATTIC RESTORATION5.0★ (2)20 mi
San Mateo Attic Insulation Now5.0★ (1)8 mi
Santa Clara A+ Insulation Service5.0★ (2)12 mi
SF Bay Attic Cleaning5.0★ (1)13 mi
Signature Home Insulation and Rodent Control5.0★ (1)13 mi
Silicon Thermal4.0★ (1)2 mi
Silicon Valley Attic Cleaning5.0★ (1)13 mi
Silver Peak Construction Group Inc.5.0★ (2)11 mi

How much do insulation contractors cost in Los Altos?

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

How much do insulation contractors cost in Los Altos?
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 Los Altos insulation contractors

We scored 85 Los Altos 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 Los Altos 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 Los Altos: frequently asked questions

Who is the best insulation contractor in Los Altos?

By CR Score, the highest-ranked insulation contractor in Los Altos, CA is Attic Pros with a CR Score of 88/100. It has 4.8★ from 1,938 Google reviews. It is open 24/7. Reactic Restoration (#2) and Service Champions (#3) follow. We ranked 85 insulation contractors on 8 factors, last updated October 22, 2026.

How many insulation contractors are there in Los Altos?

ContractorsRanked ranks 85 insulation contractors serving Los Altos, CA. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.

Which insulation contractors in Los Altos are open 24/7?

30 ranked insulation contractors in Los Altos post 24/7 hours. The highest-ranked are Attic Pros (#1), Reactic Restoration (#2) and Service Champions (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which insulation contractors in Los Altos work on weekends?

63 of 85 ranked insulation contractors post Saturday hours and 60 post Sunday hours. The highest-ranked open Saturdays are Attic Pros (#1), Reactic Restoration (#2) and Service Champions (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does attic insulation cost in Los Altos?

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

What Google rating do Los Altos insulation contractors have?

The median Google rating among 85 rated insulation contractors in Los Altos is 5.0★, with a median of 25 reviews. Service Champions has the most, 3,407 reviews, and ranks #3. 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 Los Altos count in this ranking?

Yes, if they are within 25 mi of the Los Altos 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 Los Altos

  1. October 2026: CR Scores recalculated for 85 insulation contractors serving Los Altos.

More insulation contractors and Los Altos pages

Other trades in Los Altos