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Roof Repair in Simi Valley for 1960s and 1970s Tract Homes
More than half of Simi Valley’s homes were built before 1980, most of them in a burst of tract building that peaked in the 1960s. Roof repair in Simi Valley often means working on those houses, now roughly 45 to 65 years old, in a city where about two-thirds of the land is mapped as a Very High Fire Hazard Severity Zone.
Licensed, bonded and insured, CSLB #1119699
The city grew fast. Its first tract housing went up in 1957 and 1958, and the population climbed from 8,110 in 1960 to 59,832 in 1970 and 77,500 in 1980. Older named tracts include the Greek, Texas, Italian, and Presidential tracts, while Wood Ranch is the newest major development. Simi Valley incorporated on October 10, 1969, and today about 124,861 people live here; 72.4% of the housing is single-family detached, and 72.9% of homes are owner-occupied.
Roofs on Simi Valley's 1960s and 1970s tract homes
Simi Valley’s peak building decade was the 1960s, when 28.6% of the city’s housing units were built, about twice the SCAG regional share of 14.5%. Another 19.5% went up in the 1970s. In all, 33.9% of homes were built before 1970 and 53.4% before 1980, according to ACS 2014-2018 data compiled by the Southern California Association of Governments.
A house that old has likely been reroofed before, but parts of the roof system may be original to the house:
- Roof decking that may carry old water damage at the eaves, in valleys, or around a chimney
- Flashing at walls, chimneys, and plumbing vents that may have been reused during an earlier reroof
- Attic vents that may still be sized for the original roof
- Extra layers of roofing that may have been left in place by a past recover
None of these show from the street. They turn up during an inspection or a tear-off, which is why Simi Valley roofing decisions on a tract house should start with the deck and the flashing as well as the shingles.
Roof repair in Simi Valley versus a full reroof
Our roofers do both. A repair makes sense when the deck is sound and the problem is local: a few damaged shingles, cracked or slipped tiles, failed flashing at a chimney or skylight, or a leak at a plumbing vent. A reroof makes more sense when leaks show up in several places, the deck is soft, or the roofing is worn across the whole roof.
What we do on Simi Valley roofs:
- Leak repair on shingle, tile, and low-slope roofs, including TPO
- Full reroofs with tear-off, deck repair, new underlayment, and Class A-rated shingles or tile
- Tile installations with the tile’s ICC report included in the permit application, as the city requires
- Flashing and vent repairs on older roofs
- Emergency roof repair around the clock, with fast response and same-day visits when crews are available
- Roof inspections before a sale, a solar install, or a reroof decision
If you are comparing roofers in Simi Valley, start with the license. Ours is CSLB #1119699 (C-39 Roofing), active, and Overhead Roofing is bonded, insured, and a BBB Accredited Business rated A. Our roofing team has 25+ years of experience. Estimates cost nothing, and a workmanship warranty covers the work.
July highs near 96 degrees and wide day-night swings
Simi Valley sits at an elevation of about 768 feet, ringed by the Santa Susana Mountains and the Simi Hills. July highs average about 96 degrees and January lows about 39, and the record high is 116 degrees, set in August 1985. Rainfall averages about 18 inches a year, so sun and heat do much of the work of aging a roof here.
Heat and ultraviolet light dry out asphalt shingles over time and loosen the granules that protect them. Big swings between afternoon and night make roofing materials expand and contract every day, which strains sealant joints, flashing, and fasteners. On a roof that is 20 years or more into its life, that wear shows up as curled or cracked shingles, bare spots, and flashing leaks that often first appear with the winter rains.
Heat also affects what can go on the roof. California’s 2025 Energy Code, set by the California Energy Commission, generally requires a rated cool roof product when a reroof replaces over 50% of a pitched roof in climate zones 4 and 8 through 15. Simi Valley is in climate zone 9, so a full reroof on a pitched roof usually calls for a cool-rated shingle or tile, with some exceptions.
Two-thirds of the city is mapped Very High
CAL FIRE’s March 10, 2025 maps put 17,630 acres of Simi Valley in a Very High Fire Hazard Severity Zone, plus 1,548 acres of High and 1,139 acres of Moderate. That is roughly two-thirds of the city’s 41.55 square miles of land, and slightly more Very High acreage than the 17,044 acres on the 2011 map.
Where a home sits in a Very High zone, state code requires a Class A roof covering on a replacement roof, and since January 1, 2026, those rules have been part of the California Wildland-Urban Interface Code (Title 24, Part 7). Simi Valley adopted the 2025 California Wildland-Urban Interface Code as a primary code, with local amendments, in Ordinance No. 1366, passed November 17, 2025 (Municipal Code Section 8-26.01). Check the specific address on CAL FIRE’s map before choosing materials.
Simi Fire, 2003
108,204 acres in the Simi Hills and on the southeast side of Simi Valley; 37 homes destroyed
Woolsey Fire, 2018
Started Nov. 8 south of Simi Valley; mandatory evacuations in many parts of the city
Easy Fire, 2019
2,375 acres; about 26,000 residents evacuated during a high-wind power shutoff
Sandy Fire, 2026
Started May 18 off Sandy Ave.; 2,183 acres, 1 structure destroyed, 2 damaged
Sources: CAL FIRE incident pages, ABC7, and Wikipedia event histories.
The Easy Fire nearly encircled the Ronald Reagan Presidential Library and was driven by extreme wind. Wind-driven fires carry embers ahead of the flames. A Class A covering resists burning embers, but embers can still lodge in open gaps at the eaves and ridge or in dry leaves in a gutter, so a reroof in a Very High zone should close those gaps as well. The most recent local fire, the Sandy Fire, was fully contained on May 27, 2026.
Simi Valley's online permit and two-to-three-day reroof review
Inside city limits, a roofing contractor in Simi Valley applies for a reroof permit through the city’s Customer Self Service portal, run by the Building and Safety Division of the Environmental Services Department. Contractors file a Construction Permit Declaration, and owner-builders file a Property Owner’s Package. The city states that residential reroof review takes two to three days.
- Tile roofs: a new roof tile installation must include the tile’s ICC report with the application.
- Solar: contractors apply for new roof-mounted solar through SolarAPP+, and permits are issued up to three business days after the invoice is paid.
- Outside reviews: some projects need clearance from outside agencies, including the Ventura County Fire Department.
- Outside city limits: homes in unincorporated Santa Susana Knolls are permitted by the Ventura County Resource Management Agency, not the city.
Simi Valley roof questions from homeowners
My Simi Valley house was built in the 1960s. Is it time to replace the roof?
Age alone doesn’t settle it. A 1960s house has likely been reroofed at least once, so what matters is the age of the current roofing and the condition of the deck and flashing underneath. Curled or cracked shingles across the whole roof, leaks in several places, or soft decking point to a reroof. A single leak at a vent or chimney is usually a repair.
How long does Simi Valley take to review a residential reroof permit?
The city states that residential reroof review takes two to three days. Applications go through Simi Valley’s Customer Self Service portal, with a Construction Permit Declaration from the contractor. A new tile roof also needs the tile’s ICC report attached. Homes in unincorporated Santa Susana Knolls go through Ventura County’s Resource Management Agency instead of the city.
Does a replacement roof in Simi Valley have to be Class A?
If the home is in a Very High Fire Hazard Severity Zone, yes. State code requires a Class A roof covering on a replacement roof there, and Simi Valley adopted the 2025 California Wildland-Urban Interface Code through Ordinance No. 1366. CAL FIRE’s 2025 maps place 17,630 acres, about two-thirds of the city’s land, in Very High zones, so check your address on the map before choosing materials.
Did the 2025 fire map change much for Simi Valley?
Inside the city, not by much. The 2011 map showed 17,044 acres of Very High zone in Simi Valley, and CAL FIRE’s March 10, 2025 map shows 17,630, plus 1,548 acres of High and 1,139 of Moderate. Countywide, Very High acreage rose 54% to more than 88,000 acres, and ABC7 named Simi Valley among the Ventura County cities with the most.
Do Simi Valley's hot summers change which shingles I can use?
They change what the code asks for. Simi Valley is in climate zone 9, where California’s 2025 Energy Code generally requires a rated cool roof product when more than half of a steep-slope roof is replaced. With July highs around 96 degrees and a record of 116, a cool-rated shingle also reflects more of the sun’s heat away from the attic. Some exceptions apply.
How does Simi Valley handle a solar permit after a reroof?
Solar is a separate permit. Simi Valley requires contractors to apply for new roof-mounted solar through SolarAPP+, and permits are issued up to three business days after the invoice is paid. Because panels stay on the roof for many years, it usually makes sense to replace an older roof before they go on rather than pay to remove and reinstall them later.
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