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Roofing in Garden Grove: Two Climate Zones and a Pre-Roofing Inspection
Most of Garden Grove sits in state Climate Zone 8, where replacing most of a pitched home roof calls for a rated cool roof product, but part of the southwest falls in Zone 6, where it does not. Roofing in Garden Grove also includes a city inspection of the roof structure and sheathing, required by Policy 26-022, before any new covering goes on.
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Garden Grove grew from 5,762 residents in 1950 to 84,238 in 1960 and 121,155 in 1970. By 1956, the year voters approved incorporation, about 1,400 people were moving in each month, and in the late 1950s the city was called the “fastest growing city in America.” Those numbers point to a housing stock built largely in the 1950s and 1960s, with original roof decks now 60 years old or more.
Brookhurst, Magnolia, and Beach: where Garden Grove crosses into Zone 6
The California Energy Commission maps central, north, and east Garden Grove, including the Civic Center, Chapman Avenue, and the Harbor Boulevard area, as Zone 8. Points in the southwest fall in Zone 6: near Brookhurst Street and Westminster Avenue, near Magnolia Street just south of Garden Grove Boulevard, and west of Beach Boulevard near Garden Grove Boulevard, at the West Garden Grove edge. When a reroof replaces over half the roof, the 2025 Energy Code (in force since January 1, 2026) sets these requirements:
Pitched home roof
Rated cool roof product
No cool roof requirement
Low-slope home roof
Rated cool roof product
Rated cool roof product
Commercial low-slope roof
Rated cool roof product
Rated cool roof product
Sources: CEC Building Climate Zones map; Cool Roof Rating Council summary of the 2025 California Energy Code. Some exceptions apply.
Two homes a few miles apart can fall under different rules, so we check each address on the Energy Commission’s climate zone tool, not just the ZIP code, before ordering material. In the Zone 6 area, a shingle or tile roof on a house is free of the state cool roof rating requirement, so the state leaves the color choice open; in Zone 8, the product needs that rating.
Policy 26-022 and the sheathing check before new roofing
Garden Grove’s Building & Safety Division publishes 28 policies, and only one deals with roofing: the Pre-Roofing Inspection policy (26-022). It requires an inspection of the roof structure and sheathing before any new roof covering is installed. If the roof gets covered first, the owner is left with three options:
- Open small sections of the new roof at critical spots so the inspector can see the substrate.
- Get a written warranty validation from the roofing manufacturer.
- Hire an approved independent roof consultant (an architect, engineer, or Registered Roof Consultant) to certify the substrate.
Each of those costs more time and money than the inspection itself, so the schedule should run in order: tear-off, deck repair, city inspection, then the new roof. On a house from the 1950s boom that still has its original deck, this is the one point when the owner, the roofer, and the city all see those boards uncovered. New residential and commercial permit applications go through the city’s online Development Access website.
Mobile homes, apartments, and overlay zones in Garden Grove
Garden Grove’s 2021 housing mix was 57.1% single-family detached, 8.4% single-family attached, 31.2% in buildings of two or more units, and 3.4% mobile homes, or 1,628 units. With 53.1% of homes owner-occupied, many roofs belong to landlords and apartment owners rather than the people living under them.
Mobile homes follow state rules. A permit from the state housing department (HCD) is needed before any alteration to a mobilehome or manufactured home, and HCD inspects mobilehome parks where the local government has not taken over enforcement. Before a mobile home reroof, we confirm whether the City or HCD issues the permit for that park.
Zoning can matter too. Garden Grove has a Historic Cultural Overlay Zone, a Main Street Historical-Retail Combining Zone, and a Gilbert Street Overlay meant to preserve that street’s single-family character. If a property falls in one of them, ask Planning whether a change in roof material or color needs review.
Roofing in Garden Grove for houses, apartments, and shops
Overhead Roofing handles roof repair in Garden Grove and full roof replacement in Garden Grove on these building types:
- 1950s and 1960s houses: shingle and tile repairs, tear-offs, and deck repair finished before the pre-roofing inspection.
- Apartments and commercial buildings: low-slope reroofs in modified bitumen or TPO with a rated cool roof surface, which both climate zones require.
- Mobile homes: repairs and reroofs once the permitting agency is confirmed.
- Leaks and wind damage: a 24/7 line, (877) 557-7778, with tarping or temporary sealing before the permanent fix.
Check us before you hire: CSLB license #1119699 (C-39 Roofing) is active, Overhead Roofing is bonded and insured, and the BBB lists the company as Accredited with an A rating. Our team brings 25+ years of roofing experience. We don’t charge for estimates, and finished jobs carry our workmanship warranty. Nearby cities appear in our Orange County roofing guide.
Garden Grove questions on climate zones, inspections, and mobile homes
Is my Garden Grove address in Climate Zone 6 or Zone 8?
Most of the city is Zone 8. On the Energy Commission’s map, points in the southwest near Brookhurst Street and Westminster Avenue, near Magnolia Street just south of Garden Grove Boulevard, and west of Beach Boulevard near Garden Grove Boulevard fall in Zone 6. Because the line runs through neighborhoods, check the exact address on the Commission’s climate zone tool; we do the same before ordering material.
Does a roof replacement in Garden Grove require a cool roof?
It depends on the zone and the roof. Replacing more than half of a pitched home roof requires a rated cool roof product in Zone 8 but not in Zone 6. A residential low-slope reroof past that point needs one in both zones, and so does a commercial low-slope reroof. Repairs under half the roof are not affected.
Should a roofing contractor in Garden Grove wait for the city before installing the new roof?
Yes. Policy 26-022 requires the city’s pre-roofing inspection of the roof structure and sheathing before any new covering goes on. Skipping it leaves the owner to open sections of the roof, get a manufacturer’s written warranty validation, or pay an approved roof consultant to certify the substrate. Ask that the bid show the inspection as a step between tear-off and installation.
Who issues the permit for a mobile home roof in a Garden Grove park?
It depends on the park. HCD requires a permit before any alteration to a mobilehome or manufactured home, and it inspects parks where the local government has not taken over enforcement. Garden Grove has 1,628 mobile homes, 3.4% of its housing, and we confirm with the City and HCD which agency handles your park before the work is scheduled.
Is Garden Grove in a wildfire hazard zone?
No. Garden Grove is absent from CAL FIRE’s list of Orange County cities with zoned acreage in local responsibility areas, dated March 24, 2025. Without a fire zone, the climate zone line and the Policy 26-022 inspection drive most reroof decisions in Garden Grove, along with any overlay-zone review.
Central Orange County cities, low-slope services, and code guides
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