Santa Rosa Valley is an unincorporated community in Ventura County. Here its Census and fire map figures sit beside published tile roof prices, with notes on what each may mean for an owner.
What the Census describes
The Census Bureau's 2020 to 2024 estimates list 1,010 housing units. The median year built is 1986, and only 16.0 percent of homes were built before 1980. Fewer than one in twenty, 5.0 percent, predate 1960. Owners occupy 96.6 percent of homes, the highest share in this batch of pages. The median home value is about $1.71 million.
A home from the mid 1980s is now near forty. If it still wears its first tile, the tile may be sound while the underlayment beneath has aged out. Fixr says underlayment often wears out before tile. The records say nothing about any single roof, so the plain test is to lift a few tiles and look.
Larger homes, larger roofs
A larger home may have more roof area, with hips, valleys and several levels. Price rises with area, and so does weight. RoofingCalc says tile weighs 575 to 1,100 pounds per square, and that most building codes require upgrading roof frame strength before installing materials over 600 pounds per square. If the house once had a lighter roof, ask whether the framing was reviewed before tile went on.
Fire and open land
The county's fire maps cover almost the whole community. A map-overlay estimate from CAL FIRE data puts the community at 97.1 percent in the very high zone and 99.6 percent in some mapped zone. It is an area share, not a finding about your parcel.
Clay and concrete are non-combustible materials. The roof is more than its covering, though. Rules in mapped zones may reach vents, eave closures and underlayment. Ask the county what applies at your address, and ask a bidder to name each part in writing.
Rain, climate zone and cool roofs
The nearest NOAA station, Thousand Oaks 2.1 WSW, lies 7.6 kilometers off and records 16.1 inches a year on the 1991 to 2020 normals. The community is in California climate zone 9. The California Energy Commission's 2022 cool roof sheet says requirements for alterations, which include re-roofs, apply in additional climate zones beyond those listed for new homes. Ask the building department which cool roof values apply to your re-roof.
Permits
The Ventura County Resource Management Agency handles building permits for unincorporated land. Its Building and Safety page says permits are required for most construction projects, and it keeps counter offices in Newbury Park and in the county seat. Counter hours are 8:00 AM to 4:00 PM Monday through Wednesday and Friday, and 9:00 AM to 4:00 PM on Thursday. Nothing on the page mentions re-roofs by name. Ask the division directly whether yours needs a permit, and check hours before you drive.
Cost, in national terms
Fixr's national estimates for a full replacement run $14,000 to $24,000 for concrete tile and $14,000 to $28,000 for clay (Feb 4, 2026). These describe an average roof. A large custom home may land well above them. Only written bids can say, and a home worth over $1.7 million is a good reason to compare several.
Questions for a bidder
- Please photograph the underlayment under a few lifted tiles. What condition is it in?
- Was the frame checked for the weight of the tile?
- Which fire-zone rules apply, and who confirms them?
- If tile is reused, how many pieces do you expect to break? Fixr says about 10 percent may (Jan 31, 2025).
- Which cool roof values apply to my slope and tile color?
The tile roof price guide sets out the wider ranges.
Reading a large bid
On a big roof, the bid is the document that matters. Ask for the roof area in squares, one square being 100 square feet, and for the price per square on each line. Tear-off, underlayment, flashing, tile and haul-away should be separate. Fixr gives about $50 per square as a typical tear-off cost and up to $150 per square for heavy material such as concrete tile (Feb 4, 2026). With those lines apart, two bids on a large house can be compared fairly, and a gap between them can be traced to a cause.
Sources
- U.S. Census Bureau, ACS 2020-2024 5-year, place table, Santa Rosa Valley
- CAL FIRE Fire Hazard Severity Zones, LRA map 2025-03-24 and SRA map adopted 2024-01-31, share of place area by map overlay (estimate)
- NOAA 1991-2020 climate normals, Thousand Oaks 2.1 WSW
- Ventura County Resource Management Agency, Building and Safety Division
- Ventura County RMA, Building Permit Information
- Fixr, Roof Replacement Cost (updated Feb 4, 2026)
- Fixr, Roof Underlayment Replacement Cost (updated Jan 31, 2025)
- RoofingCalc, Concrete Tile Roof Cost (published Feb 2022, updated July 30, 2023)