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Best Solar Installers in Willowbrook, CA (2026)

605 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Willowbrook: Mr. Solar Clean, CR Score 93/100; 5.0★ from 369 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Smart Solar Panel Cleaning Los Angeles, posts 24/7 hours; ranked #2 of 605.

  3. 7

    Most-reviewed: EnergyAid, 1,353 Google reviews at 4.7★, the most of 605 ranked; ranked #7.

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

605 Willowbrook solar installers are ranked here by CR Score, from 8 published factors. 75 are open 24/7, 345 open Saturdays and 222 open Sundays, based on posted hours. The median Google rating is 5.0★ across 605 rated businesses.

Most of this list also appears on the Solar installers in Los Angeles ranking. See Solar installers in Los Angeles

Top 10 solar installers in Willowbrook at a glance

Top 10 solar installers in Willowbrook at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Mr. Solar Clean935.0★ (369)Carson, 6 mi away24/7Overall
2Smart Solar Panel Cleaning Los Angeles905.0★ (90)Redondo Beach, 7 mi away24/7Emergencies
3Semper Solaris874.7★ (515)Santa Fe Springs, 11 mi awaySat · Sun · Evenings—
4ProSolar California875.0★ (31)Culver City, 9 mi away24/7—
5Sunrun Solar874.8★ (262)Santa Fe Springs, 11 mi awaySat · Sun—
6Guru Solar Cleaning LLC865.0★ (132)Long Beach, 11 mi awaySat · Sun—
7EnergyAid864.7★ (1,353)Santa Ana, 27 mi away24/7Most reviews
8Smart Solar Panel Cleaning Los Angeles865.0★ (27)Los Angeles, 11 mi away24/7—
9Solar panel maintenance, Solar diagnostic, solar repair and cleaning, bird proofing865.0★ (79)Burbank, 29 mi away24/7—
10Green Integrations and Management Inc.865.0★ (100)Los Angeles, 14 mi awaySat · Sun · Evenings—

The 605 best solar installers in Willowbrook, 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 Willowbrook

    #1 Mr. Solar Clean

    Based in Carson, 6 mi away

    93/100CR Score

    Ranked #1 because of its Google rating and availability: 5.0★ from 369 Google reviews, open 24/7.

    • 5.0★ from 369 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1714 E Balard St, Carson, CA 90745
    View profile for Mr. Solar Clean(310) 427-1091

  3. #3 Semper Solaris

    Based in Santa Fe Springs, 11 mi away

    87/100CR Score

    Ranked #3 because of its Google rating and trade focus: 4.7★ from 515 Google reviews, listed on Google as “Solar energy company”.

    • 4.7★ from 515 Google reviews
    Hours
    Mon–Sat 7 AM–12 AM · Sun 9 AM–12 AM
    Address
    10713 Norwalk Blvd, Santa Fe Springs, CA 90670
    View profile for Semper Solaris(213) 634-4313

  5. #5 Sunrun Solar

    Based in Santa Fe Springs, 11 mi away

    87/100CR Score

    Ranked #5 because of its Google rating and trade focus: 4.8★ from 262 Google reviews, listed on Google as “Solar energy company”.

    • 4.8★ from 262 Google reviews
    Hours
    Mon–Sun 8 AM–5 PM
    Address
    12830 Romandel Ave, Santa Fe Springs, CA 90670
    View profile for Sunrun Solar(833) 324-5886

  6. #6 Guru Solar Cleaning LLC

    Based in Long Beach, 11 mi away

    86/100CR Score

    Ranked #6 because of its Google rating and trade focus: 5.0★ from 132 Google reviews, listed on Google as “Solar panel maintenance service”.

    • 5.0★ from 132 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun 8 AM–2 PM
    Address
    767 Euclid Ave, Long Beach, CA 90804
    View profile for Guru Solar Cleaning LLC(562) 225-0105

  7. #7 EnergyAid

    Based in Santa Ana, 27 mi away

    86/100CR Score

    Ranked #7 because of its Google rating and trade focus: 4.7★ from 1,353 Google reviews, listed on Google as “Solar energy company”.

    • 4.7★ from 1,353 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1669 E Wilshire Ave STE 606, Santa Ana, CA 92705
    View profile for EnergyAid(877) 787-0607

  12. #12 Sun Studios

    Based in Beverly Hills, 12 mi away

    85/100CR Score

    Ranked #12 because of its Google rating and trade focus: 5.0★ from 77 Google reviews, listed on Google as “Solar energy company”.

    • 5.0★ from 77 Google reviews
    Hours
    Mon–Sun 8 AM–8 PM
    Address
    8383 Wilshire Blvd, Beverly Hills, CA 90211
    View profile for Sun Studios(833) 765-2796

  13. #13 Powerfull Solar, Inc

    Based in Los Angeles, 11 mi away

    85/100CR Score

    Ranked #13 because of its Google rating and trade focus: 5.0★ from 66 Google reviews, listed on Google as “Solar energy company”.

    • 5.0★ from 66 Google reviews
    Hours
    Mon–Sun 8 AM–8 PM
    Address
    5316 Venice Blvd., Los Angeles, CA 90019
    View profile for Powerfull Solar, Inc(310) 304-4623

  15. #15 Solar with Roció

    Based in Downey, 8 mi away

    85/100CR Score

    Ranked #15 because of its Google rating and trade focus: 5.0★ from 45 Google reviews, listed on Google as “Solar energy company”.

    • 5.0★ from 45 Google reviews
    Hours
    Mon–Sun 8 AM–8 PM
    Address
    8050 Florence Ave, Downey, CA 90241
    View profile for Solar with Roció

  18. #18 BestSolarCleaning, LLC

    Based in Hacienda Heights, 19 mi away

    84/100CR Score

    Ranked #18 because of its Google rating and trade focus: 5.0★ from 81 Google reviews, listed on Google as “Solar energy system service”.

    • 5.0★ from 81 Google reviews
    Hours
    Mon–Sat 7 AM–8 PM · Sun 7 AM–5 PM
    Address
    17009 Pepper Brook Way, Hacienda Heights, CA 91745
    View profile for BestSolarCleaning, LLC(626) 341-5597

  19. #19 Haven Energy

    Based in Los Angeles, 15 mi away

    84/100CR Score

    Ranked #19 because of its Google rating and trade focus: 4.7★ from 158 Google reviews, listed on Google as “Solar energy company”.

    • 4.7★ from 158 Google reviews
    Hours
    Mon–Fri 9 AM–6 PM · Sat–Sun 10 AM–2 PM
    Address
    12100 Wilshire Blvd, Los Angeles, CA 90025
    View profile for Haven Energy(310) 402-0881

  20. #20 Atlas Inc.

    Based in Santa Monica, 15 mi away

    84/100CR Score

    Ranked #20 because of its Google rating and availability: 5.0★ from 15 Google reviews, open 24/7.

    • 5.0★ from 15 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1431 Ocean Ave, Santa Monica, CA 90401
    View profile for Atlas Inc.(310) 775-7990

  23. #23 Energy Time Solar

    Based in Los Angeles, 9 mi away

    84/100CR Score

    Ranked #23 because of its Google rating and trade focus: 4.9★ from 45 Google reviews, listed on Google as “Solar energy company”.

    • 4.9★ from 45 Google reviews
    Hours
    Mon–Fri 7 AM–9 PM · Sat 9 AM–4 PM · Sun 10 AM–7 PM
    Address
    360 E 2nd St, Los Angeles, CA 90012
    View profile for Energy Time Solar(562) 391-5946

How much do solar installers cost in Willowbrook?

Typical prices in USD, adjusted for California with a published regional index. Each row names its basis and month.

How much do solar installers cost in Willowbrook?
JobLowTypicalHighBasisChecked
Solar panel installation$29,770$33,680$36,640Per system: about 12 kW at about $2.60 per watt, before incentives. US national range × 1.08 Pacific factor (2025 Cost vs. Value Report)October 2026

How we ranked Willowbrook solar installers

We scored 605 Willowbrook solar installers 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 Willowbrook 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

Solar installers in Willowbrook: frequently asked questions

Who is the best solar installer in Willowbrook?

By CR Score, the highest-ranked solar installer in Willowbrook, CA is Mr. Solar Clean with a CR Score of 93/100. It has 5.0★ from 369 Google reviews. It is open 24/7. Smart Solar Panel Cleaning Los Angeles (#2) and Semper Solaris (#3) follow. We ranked 605 solar installers on 8 factors, last updated October 22, 2026.

Which solar installers in Willowbrook are open 24/7?

75 ranked solar installers in Willowbrook post 24/7 hours. The highest-ranked are Mr. Solar Clean (#1), Smart Solar Panel Cleaning Los Angeles (#2) and ProSolar California (#4). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which solar installers in Willowbrook work on weekends?

345 of 605 ranked solar installers post Saturday hours and 222 post Sunday hours. The highest-ranked open Saturdays are Mr. Solar Clean (#1), Smart Solar Panel Cleaning Los Angeles (#2) and Semper Solaris (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does solar panel installation cost in Willowbrook?

Solar panel installation typically costs $29,770 to $36,640, with $33,680 typical (Per system: about 12 kW at about $2.60 per watt, before incentives. US national range × 1.08 Pacific factor (2025 Cost vs. Value Report)). The range is adjusted for California. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Willowbrook solar installers have?

The median Google rating among 605 rated solar installers in Willowbrook is 5.0★, with a median of 14 reviews. EnergyAid has the most, 1,353 reviews, and ranks #7. We adjust ratings for review count, so a few five-star reviews cannot top the list.

How does ContractorsRanked rank solar installers?

Each solar installer 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 solar installers outside Willowbrook count in this ranking?

Yes, if they are within 40 mi of the Willowbrook city center, our service radius for solar installers. 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 solar installers 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 Willowbrook

  1. October 2026: CR Scores recalculated for 605 solar installers serving Willowbrook.
  2. October 2026: 6 duplicate listings merged.

More solar installers and Willowbrook pages

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