Roof Repairin Glendora, CA
Roof repair and roof replacement in Glendora start with the address: our sample of County data puts about 39 percent of the city in the Very High fire zone, where State law calls for Class A roofing. Plan on a permit either way, and ask the Building Division which filing route applies.
Glendora roofs live under a hard climate. The nearest NOAA 1991 to 2020 station with a rain record, about 0.16 miles from the city's reference point, shows 21.31 inches a year, with 16.87 inches arriving from December through March and only 0.46 inches from June through September. Temperatures come from Pomona/Fairplex, 6.4 miles away: average highs of 90.3 F in July and 92.4 F in August, about 70.5 days a year at or above 90 and 10.7 at or above 100. Fairplex is a regional reference, not a reading taken in Glendora, but it shows what a roof carries: months of heat, then a few storms that test every flashing.
The roofs are mostly old. The Census Bureau's 2024 five-year estimates count 17,302 housing units, with 79.9 percent built before 1980, 56.5 percent in the 1950s and 1960s and a median year built of 1964. The City's Housing Element says growth came largely from annexing unincorporated land between the 1940s and the 1960s, which left a big stock of tract roofs that have been redone once or twice already. For roof repair and roof replacement, MDG Builders (CSLB #1040337) writes the scope, files the permit and runs the schedule, and a licensed C-39 roofing subcontractor does the tear-off and installation. Our roofing page holds the sourced price table, the Glendora overview shows the other trades we handle here, and Covina next door has a different set of rules.
What Glendora's Building Division, Planning and fire maps say about roofs
Where roofing permits come from in Glendora: City of Glendora Community Development Department, Building and Safety Division.
- A reroof is a permit item at the Building Division: the City's permit worksheet has a Reroof line that asks for the number of squares, roofing material, the ICC evaluation number for a tile roof, whether a detached garage is included and whether there is a tear-off. The City's Forms and Documents list has no reroof or roofing handout among its 33 documents.
- The State permit-exemption list in the 2025 California Residential Code R105.2 (as shown on a code mirror, not the State text) names fences to 7 feet, retaining walls to 4 feet, sidewalks, driveways, finish work such as painting, small decks and awnings but does not name roofing.
- Glendora is in California Energy Climate Zone 9 (CEC Building Climate Zones service, five test points across the city all returned zone 9). Under the 2025 Energy Code effective January 1, 2026, a single-family steep-slope re-roof in zones 4 and 8 to 15 needs a product with aged solar reflectance 0.20 and thermal emittance 0.75 (or SRI 16), per the Cool Roof Rating Council's chart.
- The same CRRC chart treats these as equivalent to a cool roof product: ceiling insulation of at least R-38 or a ceiling U-factor of 0.025 or lower, an attic radiant barrier, in zones 2, 4, 9, 10, 12 and 14 a house with no ducts in the attic, or R-2 or more continuous insulation above or below the roof deck. Roof constructions that weigh 25 pounds per square foot or more are exempt from the rule. The chart does not give the roof area that triggers the rule and says to read the code.
- The City's Safety Element says State law since 1994 (AB 3819) requires Class A roofing and 30 feet of clearance around structures in very high fire hazard severity zones, and its policy SAF-2.8 requires fire resistant building materials in hillside and very high zones.
- A mirror of the 2025 California Wildland-Urban Interface Code (an AI-generated summary page, not the State text) says that when an existing roof covering is replaced, or 50 percent or more is replaced within 12 months, the new covering must meet the new-construction roof requirements, and that all portions of a roof covering applied in an addition, alteration or repair must be at least Class A. It also shows enclosed eaves and soffits needing noncombustible or ignition-resistant protection.
- The WUI code mirror says ventilation openings must be fully covered with wildfire flame and ember resistant vents (State Fire Marshal listed or ASTM E2886 tested), which affects roof vent swaps in a fire zone.
- The WUI code mirror also lists an exception to its material requirements for additions to and remodels of buildings originally built before July 1, 2008, which sits awkwardly with its roof replacement rule, so a writer should tell readers to confirm the Class A trigger with the Building Division.
Sources for these rules
- cityofglendora.gov: nov2020 plan and permit ap
- gocodebook.com: section r105 permits
- coolroofs.org: 2025 Energy Code Summary CRRC 2025 12 04 1
- cityofglendora.gov: safety element 2025
- gocodebook.com: roof assemblies coverings
- gocodebook.com: special building construction
- gocodebook.com: ignition resistant materials
Is my Glendora house in the Very High Fire Hazard Severity Zone?
The City's Safety Element, adopted October 28, 2025, says Glendora's place at the base of the San Gabriel Mountains creates a wildland-urban interface, with Very High zones mapped inside the city. We tested 302 evenly spaced points in the city boundary against the County's copy of the CAL FIRE Local Responsibility Area layer, revised August 21, 2025. Of those, 119 points (39.4 percent) came back Very High, 19 High, 12 Moderate and 88 Non-Wildland, and 64 returned no zone, possibly federal land. That is a sample, not a map overlay, and it says nothing about one parcel.
It does show the zone is not only a northern strip: the Very High points ran from about 34.1176 to 34.1696 north latitude in a city that spans 34.1056 to 34.1797. The answer for a house comes from the City's Fire Hazard Severity Zone Map on file with the Building Division, which Municipal Code 19.06.020 adopts. The code's own explanation of the zone is chaparral, hot Santa Ana winds, steep terrain and lower water pressure.
The 2014 Colby Fire, which began with an illegal campfire, burned 1,992 acres, destroyed five homes and sent 3,600 people out, and the Safety Element lists the Station, Bobcat and Bridge fires burning near the city in 2009, 2020 and 2024.
Ask the Building Division for the zone answer on your address before a bid names a covering, because it changes the roof, the vents and the eaves.
When does a Glendora roof replacement have to be Class A?
The Safety Element says State law since 1994, through AB 3819, requires Class A roofing and 30 feet of clearance around structures in very high zones, and its policy SAF-2.8 calls for fire resistant materials on hillside and very high zone buildings. The re-roof trigger is the unsettled part. A mirror of the 2025 California Wildland-Urban Interface Code on gocodebook.com, which is an AI-generated summary and not the State text, says that when an existing roof covering is replaced, or 50 percent or more is replaced within 12 months, the new covering must meet the new-construction roof rules, and that every part of a covering applied in a repair, alteration or addition must be at least Class A.
The same mirror lists an exception for additions to and remodels of buildings first built before July 1, 2008, which sits awkwardly beside that roof rule. Glendora adopted the 2025 WUI code by reference in Chapter 19.07 (Ordinance 2097, November 12, 2025), but we did not confirm how the Building Division applies it to a roof-only job. Treat Class A as the working assumption inside the zone, and have the counter confirm the trigger for your address.
A fair proposal for roof replacement states four things:
- The roof area replaced, in squares, so the 50 percent line is a number
- The fire class of the finished assembly, not only the shingle or tile brand
- Whether the address is inside the City's fire zone map
- What happens if staged repairs add up inside 12 months
Do vents and eaves change a roof replacement in the fire zone?
They can. The same code mirror says ventilation openings must be fully covered with wildfire flame and ember resistant vents, either listed by the State Fire Marshal or tested to ASTM E2886, and that enclosed eaves and soffits need noncombustible or ignition-resistant protection. Old box vents and open soffit vents on a 1960s ranch are the kind of detail those lines target, so a quote that reuses them inside the zone earns a question.
Wind belongs in the same conversation. The City's 2019 Design Criteria list a 95 mph wind for risk category II, a 110 mph Exposure C special wind region and zero ground snow load, so fastening should be planned for gusts, not snow. Glendora's own fire ordinance blames hot, high-velocity Santa Ana winds for the hazard, which is why ember paths matter as much as the shingle.
Do hillside rules or the Historic District change a Glendora re-roof?
Two overlays can reach a roof that does not change size. Parcels at 10 percent average slope or more fall under the hillside rules in Municipal Code 21.04.030, which call for fire retardant building materials, earth-tone exterior colors and no reflective material visible from more than 100 feet. The code does not say how a re-roof on an existing hillside house is reviewed, so call Planning at (626) 914-8214 before ordering a tile or metal color.
Near Glendora Village the question is about history. The City lists one designated Historic District, a residential area documented in a 1995 survey, plus 38 landmarks and one historic resource on streets such as Glendora Avenue, Bennett Avenue, Pasadena Avenue, Foothill Boulevard and Wabash Avenue. Work that changes a preserved exterior feature goes to the Planning Commission for a Certificate of Appropriateness, and code 21.07.060 exempts ordinary maintenance that changes no design, material or outward appearance. Whether the district is a designated overlay zone, and whether a like-for-like roof counts as maintenance, the City's pages do not say, so ask.
Only 5.0 percent of Glendora's units, 859 homes, date from 1939 or earlier, so the group is small. The way to know if a house belongs to it is to ask Planning, not to guess from the street.
Does roof replacement in Glendora need a permit, and where do I file it?
Plan on a permit. The City's permit worksheet has a Reroof line that asks for the number of squares, the roofing material, the ICC evaluation number if the roof is tile, whether a detached garage is included and whether the old roof is torn off. The State exemption list in the 2025 Residential Code, R105.2, names fences, retaining walls, painting and small decks but not roofing, and Glendora's building code chapters make no local change to it. We read that list on a code mirror, not on the State text.
Where to file is a live question. The City's Forms page says applications are no longer accepted by email and must go through the Civic Access portal, which needs an account, while the Permit Application and Plan Review page still describes an emailed worksheet and a payment link. Ask the Building Division at (626) 914-8222 which applies. A contractor applicant supplies a copy of the license and the contractor's declaration form, and an owner-builder signs a separate declaration. We found no fee amounts or turnaround times, so none are printed.
Inspections are booked through Civic Access, and the City's inspection window runs from 9:00 a.m. to 3:30 p.m. on weekdays. On tear-off days, Municipal Code 9.44.110 bars annoying outside work in or within 500 feet of a residential zone from 9:00 p.m. to 7:00 a.m. without a permit.
How do the cool roof rule and rooftop solar fit into a Glendora re-roof?
Glendora is in California Energy Climate Zone 9. The Cool Roof Rating Council's chart of the 2025 Energy Code, in force since January 1, 2026, says a single-family steep-slope re-roof in zones 4 and 8 to 15 needs a product with an aged solar reflectance of 0.20 and a thermal emittance of 0.75, or an SRI of 16. It lists ways to meet the rule without a cool product, among them ceiling insulation of R-38 or better, an attic radiant barrier and, in zone 9, a house with no ducts in the attic. The chart omits the roof area that triggers the rule, so read the code and ask the counter.
Solar changes the order of work. Chapter 19.21 gives a rooftop system of 10 kilowatts AC or less on a single-family or duplex home an expedited permit, the County Fire Department says rooftop solar and storage must pass a Fire Prevention Division inspection before use, and the City's Forms page lists SolarAPP+ as coming soon with no document linked. Panels usually come off before tear-off and go back after, which Angi's Los Angeles page prices at $500 to $1,000.
How much does roof replacement cost in Glendora, California?
We found no Glendora price survey, so we print no Glendora price. The nearest sourced figures are for Los Angeles. Angi's page, updated July 31, 2026, puts a typical roof at $10,256 to $24,963, with asphalt at $4 to $12 per square foot, tile at $7 to $15, metal at $7 to $16 and tear-off at $1,000 to $3,000. Remodeling magazine's Cost vs. Value 2025 report prices one reference Los Angeles roof at $36,417 in asphalt, recouping 73.6 percent at sale, and $62,069 in metal, recouping 48.7 percent. It does not publish its roof size, which explains most of the gap with Angi.
Glendora adds items those surveys leave out: a Class A assembly and ember-resistant vents in the zone, deck repairs found at tear-off and solar reset. Ask each bidder to price them on separate lines, and settle in writing how rotted decking is handled. Business and Professions Code section 7159 caps a down payment at $1,000 or 10 percent of the contract, whichever is less. Roofing is CSLB class C-39, so check the license before comparing prices, and see how general contractors use subcontractors to know who answers for what.
Roofing photos from Glendora and nearby communities
Roofing scenes tied to Glendora Village, Alosta and the South Hills and to nearby communities such as Azusa and San Dimas, with tile, shingle and flashing work in the foothill sun.
Where the roof numbers come from
Every figure and its source sits in the table on our roofing price page, and the California roof replacement cost guide explains why Angi and Cost vs. Value land so far apart. New roofs often arrive with paint, fence or kitchen work, and the Glendora rules for those are on the fencing page, the painting page and the kitchen remodeling page. Readers weighing other San Gabriel Valley and foothill cities can read the roofing guides for Pomona, West Covina, Glendale and Pasadena.
| What it covers | Typical range |
|---|---|
| Asphalt shingle, typical single-family roof | $10,000 to $25,000 |
| Concrete or clay tile | $7 to $15 per sq ft |
| Metal | $7 to $16 per sq ft |
| Remodeling Cost vs. Value 2025, Los Angeles | Asphalt $36,417. metal $62,069. |
| Extras | Tear-off $1,000 to $3,000. solar detach and reset $500 to $1,000. |
Glendora roofing questions, answered
How much does roof replacement cost in Glendora, California?
Nobody has published a Glendora survey, so price by roof area and treat Los Angeles data as a guide. Angi's July 2026 Los Angeles page gives $4 to $12 per square foot for asphalt, $7 to $15 for tile and $7 to $16 for metal, with tear-off at $1,000 to $3,000. A measured written proposal that lists the extras is the real price.
Do I need a permit to replace my roof in Glendora, and how do I file it?
Plan on yes. The City's permit worksheet has a Reroof line, and the State exemption list we read on a mirror site does not name roofing. The City's pages disagree on filing: the Forms page points to the Civic Access portal, while another page still describes an emailed worksheet. Ask the Building Division which route applies.
What is a Class A roof, and does my Glendora house need one?
Class A is the highest fire rating a roof assembly can earn in the ASTM E108 and UL 790 tests. The City's Safety Element says State law requires Class A roofing in very high fire zones. Outside the zone we found no Class A rule in the sources we read, so check the City's fire map for your address and confirm with the Building Division.
What is the 25 percent rule for roof repairs?
We found no California or Glendora code section by that name, and the contractor sites that repeat it rarely cite one. The number we can point to is 50 percent within 12 months: a mirror of the State wildland-urban interface code says replacing that much brings the new covering up to new-construction standards. Ask the Building Division before staging a repair.
Should I repair or replace a 20 year old roof in Glendora?
Condition matters more than age, so have a roofer photograph the flashing, underlayment and deck before you decide. A repair that stays under the 50 percent line may avoid a full re-roof, but we found no sourced roof lifespan for Glendora and print none. Ask how many layers are on the house, because tract roofs from the 1950s and 1960s may already have been redone.
Is a cool roof required for roof replacement in Glendora?
Probably, for a single-family steep-slope re-roof. Glendora is in Climate Zone 9, and the Cool Roof Rating Council's chart of the 2025 Energy Code asks for an aged solar reflectance of 0.20 and thermal emittance of 0.75, or an SRI of 16, unless an exception such as R-38 ceiling insulation or an attic radiant barrier applies. The chart omits the trigger area, so confirm it.
Can a general contractor do roofing in California?
A general contractor can manage a roofing job, while the work itself is done by a roofing contractor holding CSLB class C-39. That is how MDG Builders (CSLB #1040337) runs it: we write the scope, pull the permit and schedule a licensed roofing subcontractor. You can ask for the subcontractor's license number and certificate of insurance before signing.
What is the best time of year to replace a roof in Glendora?
The dry months, from late spring through early fall. NOAA's normals for the Glendora station show 16.87 of 21.31 inches of rain from December through March and only 0.46 inches from June through September. Heat is the trade-off, since Pomona/Fairplex averages 70.5 days a year at 90 degrees or more. We found no sourced price difference by month.
How do I check a roofing contractor's license in California?
Enter the license number on the CSLB website, where the record shows the classification, status, bond and workers' compensation. Roofing is class C-39. Glendora also requires a business license before a company operates in the city, but the City's code calls that license a receipt for tax paid, not approval of the work.
Do solar panels change a roof replacement in Glendora?
Yes. Panels usually have to come off before tear-off and go back afterward, which Angi's Los Angeles page prices at $500 to $1,000. Glendora gives rooftop solar of 10 kilowatts AC or less on a one or two family home an expedited permit under Chapter 19.21, and the County Fire Department requires a Fire Prevention inspection before use.
Ask for a roof inspection in Glendora
Send the street, roughly when the roof was last replaced and whether the lot slopes toward the foothills. We check the fire map, the Historic District and the permit route before we call back.