Find where your Ontario roof is leaking
24 licensed roofing contractors are based in Ontario. See Ontario's rain and storm numbers below, then the list of local companies.
Licenses checked · California Contractors State License Board
11.6 innormal precipitation a year
Rainfall in Ontario
Ontario sees about 11.6 inches of rain most years.
February alone brings roughly 3.1 inches, more than any other month on the calendar.
A roof inspection ahead of that stretch is cheaper than a repair during it, for any Ontario homeowner watching for the first drip.
Data: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020 (annual/seasonal and monthly, by station) (1991-2020), from the nearest NOAA station 1.4 mi away.
What federal hazard data shows for Ontario
On FEMA's county-level hazard index, wind risk around Ontario comes in at Relatively High.
A hard wind event can lift shingle edges or shift flashing on a Ontario roof just enough to start a leak that wasn't there the week before.
A post-storm look at the roof is a reasonable habit for any Ontario homeowner after a windy night.
- Hail
- Relatively Moderate
- Strong wind
- Relatively High
- Wildfire
- Very High
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Ontario roofing companies for leak repair
Alphabetical by business name, nothing more. Speed and quality aren't part of the sort.
Alc Roofing
Roofing contractor
- License
- C-39 Roofing · 1148910
- Since
- 2026
- Expires
- Jan 31, 2028
- ZIP
- 91762
All - Right Roofing LLC
Roofing contractor
- License
- C-39 Roofing · 726974
- Since
- 1996
- Expires
- Jul 31, 2027
- ZIP
- 91761
B & M Roofing Stripping Services
Roofing contractor
- License
- C-39 Roofing · 626422
- Since
- 1991
- Expires
- Jan 31, 2027
- ZIP
- 91762
Custom Construction
Roofing contractor
- License
- B General Building / C-39 Roofing · 630203
- Since
- 1991
- Expires
- Oct 31, 2027
- ZIP
- 91764
Emmons Roof Service INC
Roofing contractor
- License
- C-39 Roofing · 638856
- Since
- 1992
- Expires
- Mar 31, 2028
- ZIP
- 91761
Empire Roofing CO
Roofing contractor
- License
- C-39 Roofing · 836616
- Since
- 2004
- Expires
- Apr 30, 2028
- ZIP
- 91761
Enhanced Roofing INC
Roofing contractor
- License
- B General Building / C-39 Roofing · 1120148
- Since
- 2024
- Expires
- May 31, 2028
- ZIP
- 91761
Espinoza Roofing
Roofing contractor
- License
- C-39 Roofing · 686396
- Since
- 1994
- Expires
- Mar 31, 2028
- ZIP
- 91764
Grace Pro Roofing INC
Roofing contractor
- License
- C-39 Roofing · 1053426
- Since
- 2019
- Expires
- Feb 28, 2027
- ZIP
- 91761
Hidalgo's Roofing
Roofing contractor
- License
- C-39 Roofing · 1098311
- Since
- 2022
- Expires
- Oct 31, 2026
- ZIP
- 91762
Ie Roof Experts
Roofing contractor
- License
- C-39 Roofing · 1147770
- Since
- 2025
- Expires
- Dec 31, 2027
- ZIP
- 91764
J 1 Pro Roofing
Roofing contractor
- License
- C-39 Roofing · 1084959
- Since
- 2021
- Expires
- Dec 31, 2027
- ZIP
- 91764
Klondike Roof Construction Service
Roofing contractor
- License
- C-39 Roofing · 990645
- Since
- 2014
- Expires
- Feb 29, 2028
- ZIP
- 91761
Legend Construction Services INC
Roofing contractor
- License
- B General Building / C-39 Roofing · 1038753
- Since
- 2018
- Expires
- Apr 30, 2028
- ZIP
- 91761
Midas Roofing INC
Roofing contractor
- License
- C-39 Roofing · 1124814
- Since
- 2024
- Expires
- Aug 31, 2028
- ZIP
- 91761
Myco Construction
Roofing contractor
- License
- B General Building / C-17 Glazing / C-39 Roofing · 853581
- Since
- 2005
- Expires
- Nov 30, 2027
- ZIP
- 91761
Pago Roofing
Roofing contractor
- License
- C-39 Roofing · 790460
- Since
- 2001
- Expires
- Jan 31, 2027
- ZIP
- 91764
Sandoval
Roofing contractor
- License
- C-39 Roofing · 927957
- Since
- 2009
- Expires
- May 31, 2027
- ZIP
- 91761
Spec Construction CO INC
Roofing contractor
- License
- B General Building / C-17 Glazing / C-36 Plumbing / C-39 Roofing · 419626
- Since
- 1982
- Expires
- Aug 31, 2027
- ZIP
- 91762
Tapia Roofing
Roofing contractor
- License
- C-39 Roofing · 1149023
- Since
- 2026
- Expires
- Jan 31, 2028
- ZIP
- 91761
The Goat Roofing LLC
Roofing contractor
- License
- C-39 Roofing · 1158821
- Since
- 2026
- Expires
- Jul 31, 2028
- ZIP
- 91761
Top Of The Line Roofing
Roofing contractor
- License
- C-39 Roofing · 810795
- Since
- 2002
- Expires
- Jul 31, 2028
- ZIP
- 91762
VRV Roofing INC
Roofing contractor
- License
- C-39 Roofing · 1103520
- Since
- 2023
- Expires
- Apr 30, 2027
- ZIP
- 91761
Wright Wood Roofing INC
Roofing contractor
- License
- C-39 Roofing · 1106726
- Since
- 2023
- Expires
- Jun 30, 2027
- ZIP
- 91764
Questions to ask a {city} roof leak repair company
- Can you find the actual source before you quote a repair, not just patch where the ceiling is wet?
- Is this a contained repair, or does it point to a bigger problem with the roof?
- Will you check the attic and insulation for existing water damage, not just the roof surface?
- What's your timeline if it's actively raining versus once it's dry?
- Do you offer a temporary tarp while a full repair is scheduled?
- What's covered by a workmanship warranty on the repair itself?