58/100CR Score
Ranked #1 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “Siding contractor”.
- 5.0★ from 27 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 269 W Foothill Blvd, Glendora, CA 91741
Best Siding Contractors in Ontario, CA (2026)
99 siding contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Ontario: Glendora Roofing Solutions, CR Score 58/100; 5.0★ from 27 Google reviews; open 7 days a week.
- 2
Best for emergencies (open 24/7): Red Turtle Roofing of Fullerton, posts 24/7 hours; ranked #2 of 99.
- 27
Most-reviewed: CAT Exteriors, 348 Google reviews at 4.5★, the most of 99 ranked; ranked #27.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
99 Ontario siding contractors are ranked here by CR Score, from ten published factors. 14 are open 24/7, 78 open Saturdays and 55 open Sundays, based on posted hours. The median Google rating is 4.9★ across 99 rated businesses.
Top 10 siding contractors in Ontario at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Glendora Roofing Solutions | 58 | 5.0★ (27) | Glendora, 13 mi away | Sat · Sun · Evenings | Overall |
| 2 | Red Turtle Roofing of Fullerton | 58 | 5.0★ (31) | Anaheim, 28 mi away | 24/7 | Emergencies |
| 3 | 24HRC | 58 | 4.8★ (41) | Irvine, 30 mi away | 24/7 | — |
| 4 | Window World of Riverside County | 58 | 4.7★ (151) | Riverside, 15 mi away | — | — |
| 5 | La Habra Top Roofing | 57 | 5.0★ (26) | La Habra, 19 mi away | Sat · Sun · Evenings | — |
| 6 | Diego’s Quality Construction | 57 | 5.0★ (47) | Rancho Santa Margarita, 30 mi away | Sat · Sun | — |
| 7 | VG Tech | 57 | 4.4★ (13) | Rancho Cucamonga, 5 mi away | Sat · Sun · Evenings | — |
| 8 | Corona Roofing & Siding | 56 | 4.8★ (34) | Corona, 12 mi away | 24/7 | — |
| 9 | Sears Window Replacement | 56 | 3.7★ (12) | Montclair, 3 mi away | Sat · Sun · Evenings | — |
| 10 | SunTrust Remodeling | 56 | 4.8★ (199) | Irvine, 30 mi away | — | — |
The 99 best siding contractors in Ontario, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Anaheim, 28 mi away
58/100CR ScoreRanked #2 because of its Google rating and trade focus: 5.0★ from 31 Google reviews, listed on Google as “Siding contractor”.
- 5.0★ from 31 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
#3 24HRC
Based in Irvine, 30 mi away
58/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.8★ from 41 Google reviews, listed on Google as “Siding contractor”.
- 4.8★ from 41 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 47 Tesla, Irvine, CA 92618
Based in Riverside, 15 mi away
58/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.7★ from 151 Google reviews, listed on Google as “Siding contractor”.
- 4.7★ from 151 Google reviews
- Hours
- Mon–Fri 8 AM–5 PM · Sat–Sun closed
- Address
- 11730 Sterling Ave, Riverside, CA 92503
Based in La Habra, 19 mi away
57/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 26 Google reviews, listed on Google as “Siding contractor”.
- 5.0★ from 26 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 511 S Harbor Blvd, La Habra, CA 90631
Based in Rancho Santa Margarita, 30 mi away
57/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 47 Google reviews, listed on Google as “Siding contractor”.
- 5.0★ from 47 Google reviews
- Hours
- Mon–Sun 7 AM–5 PM
- Address
- Rancho Santa Margarita, CA 92688
#7 VG Tech
Based in Rancho Cucamonga, 5 mi away
57/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.4★ from 13 Google reviews, listed on Google as “Siding contractor”.
- 4.4★ from 13 Google reviews
- Hours
- Mon–Sun 7 AM–9 PM
- Address
- 8866 Utica Ave, Rancho Cucamonga, CA 91730
Based in Corona, 12 mi away
56/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.8★ from 34 Google reviews, listed on Google as “Roofing contractor”.
- 4.8★ from 34 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2430 Railroad St bldg 5, Corona, CA 92880
Based in Montclair, 3 mi away
56/100CR ScoreRanked #9 because of its Google rating and trade focus: 3.7★ from 12 Google reviews, listed on Google as “Siding contractor”.
- 3.7★ from 12 Google reviews
- Hours
- Mon–Sun 9 AM–10 PM
- Address
- 5080 Montclair Plz Ln, Montclair, CA 91763
Based in Irvine, 30 mi away
56/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.8★ from 199 Google reviews, listed on Google as “Siding contractor”.
- 4.8★ from 199 Google reviews
- Hours
- Mon–Fri 9 AM–5 PM · Sat–Sun closed
- Address
- 19100 Von Karman Ave #600, Irvine, CA 92612
Based in Santa Fe Springs, 25 mi away
56/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 24 Google reviews, listed on Google as “Siding contractor”.
- 5.0★ from 24 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 14051 Stage Rd, Santa Fe Springs, CA 90670
Based in Santa Fe Springs, 26 mi away
56/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.0★ from 126 Google reviews, listed on Google as “Siding contractor”.
- 4.0★ from 126 Google reviews
- Hours
- Mon–Sun 9 AM–10 PM
- Address
- 10395 Slusher Dr, Santa Fe Springs, CA 90670
Based in Pomona, 5 mi away
56/100CR ScoreRanked #13 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Siding contractor”.
- 5.0★ from 5 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 605 S Reservoir St, Pomona, CA 91766
Based in Rancho Cucamonga, 2 mi away
56/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Siding contractor”.
- 5.0★ from 9 Google reviews
- Hours
- Mon–Sat 7 AM–7 PM · Sun closed
- Address
- 8837 Grove Ave Unit 810, Rancho Cucamonga, CA 91730
Based in Pomona, 6 mi away
56/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.3★ from 6 Google reviews, listed on Google as “Siding contractor”.
- 4.3★ from 6 Google reviews
- Hours
- Mon–Sun 7 AM–9 PM
- Address
- 217 E Mission Blvd, Pomona, CA 91766
Based in Los Angeles, 36 mi away
56/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 36 Google reviews, listed on Google as “Siding contractor”.
- 5.0★ from 36 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 3851 Aloha St, Los Angeles, CA 90027
Based in Los Angeles, 36 mi away
55/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 31 Google reviews, listed on Google as “Siding contractor”.
- 5.0★ from 31 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 4351 Perlita Ave, Los Angeles, CA 90039
#18 Siding Pros Corp
Based in San Dimas, 10 mi away
55/100CR ScoreRanked #18 because of its Google rating and trade focus: 3.9★ from 7 Google reviews, listed on Google as “Siding contractor”.
- 3.9★ from 7 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1173 N Dixie Dr # 201, San Dimas, CA 91773
Based in Anaheim, 17 mi away
55/100CR ScoreRanked #19 because of its Google rating and review volume: 4.8★ from 132 Google reviews.
- 4.8★ from 132 Google reviews
- Hours
- Mon–Sun 8 AM–6 PM
- Address
- 1220 Fee Ana St, Anaheim, CA 92807
Based in Colton, 26 mi away
55/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.8★ from 32 Google reviews, listed on Google as “Siding contractor”.
- 4.8★ from 32 Google reviews
- Hours
- Mon–Fri 7:30 AM–6 PM · Sat 7:30 AM–3 PM · Sun closed
Based in Los Angeles, 36 mi away
55/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ from 51 Google reviews, listed on Google as “Siding contractor”.
- 5.0★ from 51 Google reviews
- Hours
- Mon–Sat 8 AM–4 PM · Sun closed
- Address
- 3171 Los Feliz Blvd Ste 209, Los Angeles, CA 90039
Based in Claremont, 3 mi away
55/100CR ScoreRanked #22 because of its Google rating and review volume: 5.0★ from 21 Google reviews.
- 5.0★ from 21 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Los Angeles, 37 mi away
54/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 42 Google reviews, listed on Google as “Siding contractor”.
- 5.0★ from 42 Google reviews
- Hours
- Mon–Fri 7 AM–5 PM · Sat 7 AM–3 PM · Sun closed
- Address
- 145 W 119th St, Los Angeles, CA 90061
#24 Ameriside
Based in Lake Forest, 28 mi away
54/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.8★ from 62 Google reviews, listed on Google as “Siding contractor”.
- 4.8★ from 62 Google reviews
- Hours
- Mon–Fri 8 AM–4 PM · Sat–Sun closed
- Address
- 20541 Pascal Way, Lake Forest, CA 92630
Based in Beverly Hills, 40 mi away
54/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.9★ from 22 Google reviews, listed on Google as “Siding contractor”.
- 4.9★ from 22 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Siding 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 99 ranked siding contractors here; the rest are on their profiles.
Also serving Ontario
20 more siding contractors within 40 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 |
|---|---|---|
| BPM | 4.9★ (54) | In Ontario |
| Cal Roofing Co. | 5.0★ (2) | 27 mi |
| CRS Commercial | 4.9★ (29) | In Ontario |
| E Z Seal Construction Inc | 5.0★ (1) | In Ontario |
| Empire Sheet Metal | 5.0★ (2) | In Ontario |
| Escandon construction inc | 5.0★ (8) | In Ontario |
| Express Roofing and Solar of San Juan Capistrano | 5.0★ (2) | 30 mi |
| Fantastic Wood Coatings | 5.0★ (1) | In Ontario |
| Foundry Service & Supplies, Inc. | 3.8★ (11) | In Ontario |
| Karlsson Roofing Co. | In Ontario | |
| Legend Construction Services Inc. | 5.0★ (15) | In Ontario |
| Metal Roofing Californias | 3.0★ (1) | In Ontario |
| Morgan Termite Control | 5.0★ (2) | 19 mi |
| MZ PRO HOME IMPROVEMENTS | 4.2★ (14) | In Ontario |
| OM Roofing and Construction | 5.0★ (1) | In Ontario |
| Ontario Roofing | 4.9★ (48) | In Ontario |
| RBI | 4.5★ (2) | 30 mi |
| roofingrepairontario | In Ontario | |
| Sears Heating and Air Conditioning | 5.0★ (2) | 25 mi |
| Sears Window Replacement | 3.0★ (2) | 28 mi |
How much do siding contractors cost in Ontario?
Typical prices in USD, adjusted for California with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Siding replacement | $5,730 | $11,950 | $18,280 | Per house: typical range of customer-reported projects. US national range × 1.03 Pacific factor (2025 Cost vs. Value Report) | October 2026 |
How we ranked Ontario siding contractors
We scored 99 Ontario siding 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 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 Ontario 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 |
Siding contractors in Ontario: frequently asked questions
Who is the best siding contractor in Ontario?
By CR Score, the highest-ranked siding contractor in Ontario, CA is Glendora Roofing Solutions with a CR Score of 58/100. It has 5.0★ from 27 Google reviews. It is open 7 days a week. Red Turtle Roofing of Fullerton (#2) and 24HRC (#3) follow. We ranked 99 siding contractors on ten factors, last updated October 22, 2026.
How many siding contractors are there in Ontario?
ContractorsRanked ranks 99 siding contractors serving Ontario, CA. Another 20 within 40 mi are listed but not ranked yet. Counts are as of October 2026.
Which siding contractors in Ontario are open 24/7?
14 ranked siding contractors in Ontario post 24/7 hours. The highest-ranked are Red Turtle Roofing of Fullerton (#2), 24HRC (#3) and Corona Roofing & Siding (#8). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which siding contractors in Ontario work on weekends?
78 of 99 ranked siding contractors post Saturday hours and 55 post Sunday hours. The highest-ranked open Saturdays are Glendora Roofing Solutions (#1), Red Turtle Roofing of Fullerton (#2) and 24HRC (#3). Posted hours are office hours; crews may book weekend jobs separately.
How much does siding replacement cost in Ontario?
Siding replacement typically costs $5,730 to $18,280, with $11,950 typical (Per house: typical range of customer-reported projects. US national range × 1.03 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 Ontario siding contractors have?
The median Google rating among 99 rated siding contractors in Ontario is 4.9★, with a median of 17 reviews. CAT Exteriors has the most, 348 reviews, and ranks #27. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank siding contractors?
Each siding 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 siding contractors outside Ontario count in this ranking?
Yes, if they are within 40 mi of the Ontario city center, our service radius for siding 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 Ontario
- October 2026: CR Scores recalculated for 99 siding contractors serving Ontario.
More siding contractors and Ontario pages
Siding contractors near Ontario
- Siding contractors in Upland, CA99 ranked
- Siding contractors in Montclair, CA101 ranked
- Siding contractors in Chino, CA106 ranked
- Siding contractors in Rancho Cucamonga, CA92 ranked
- Siding contractors in Claremont, CA108 ranked
- Siding contractors in Pomona, CA116 ranked
- Siding contractors in Los Serranos, CA110 ranked
- Siding contractors in La Verne, CA119 ranked
- Siding contractors in Chino Hills, CA116 ranked
- Siding contractors in Eastvale, CA94 ranked
Other trades in Ontario
- Roofers in Ontario1495 ranked
- Plumbers in Ontario937 ranked
- Electricians in Ontario599 ranked
- HVAC contractors in Ontario983 ranked
- General contractors in Ontario860 ranked
- Painters in Ontario156 ranked
- Landscapers in Ontario164 ranked
- Handymen in Ontario88 ranked
- Kitchen remodelers in Ontario403 ranked
- Bathroom remodelers in Ontario422 ranked
- Flooring contractors in Ontario388 ranked
- Tile installers in Ontario66 ranked
- Drywall contractors in Ontario34 ranked
- Concrete contractors in Ontario291 ranked
- Fence contractors in Ontario201 ranked
- Deck builders in Ontario100 ranked
- Window installers in Ontario586 ranked
- Gutter installers in Ontario108 ranked
- Insulation contractors in Ontario118 ranked
- Solar installers in Ontario489 ranked
- Garage door repair companies in Ontario179 ranked
- Foundation repair companies in Ontario160 ranked
- Tree services in Ontario287 ranked
- Masonry contractors in Ontario155 ranked
- Water damage restoration companies in Ontario1029 ranked
- Home builders in Ontario601 ranked
- Demolition contractors in Ontario108 ranked
- All contractors in Ontario