Mold Remediation in Windsor, CA
Windsor has the newest housing of any town on this site, and that changes where mold tends to start. Santa Rosa Mold Pros is a free quote service: describe what you see, and independent companies that work in Windsor reply with quotes. No obligation, and the site never does the work itself.
Get a Free QuoteWindsor homes by the numbers
| Windsor | Santa Rosa, CA | |
|---|---|---|
| Median year built | 1993 | 1980 |
| Homes built before 1980 | 14.7% | 50.0% |
| Owner-occupied | 75.6% | 56.7% |
| Population, July 2025 estimate | 25,864 | 179,437 |
Sources: ACS 2024 5-year; Census Bureau population estimates, July 2025.
Windsor grew about five-fold in the 1980s and incorporated in 1992. More than a third of its homes (36.3%) were built in the 1990s, another 25.3% in the 1980s and 21.5% in the 2000s. The town sits about 9 miles northwest of Santa Rosa, CA, beside Charles M. Schulz-Sonoma County Airport, and three out of four homes are lived in by their owners.
The 25-to-35-year mark
Fewer asbestos questions, but a different set of aging parts. A house from the 1990s is now old enough for its first round of big failures:
- Original roofs and flashing near the end of their service life, letting winter rain into the attic at valleys, vents and skylights.
- Water heaters, washing-machine hoses and toilet supply lines that fail slowly and wet the subfloor.
- Window and door flashing on stucco walls, where water gets behind the finish and shows up as swollen or stained interior trim.
- Attic condensation when bath fans vent into the attic rather than outdoors.
Most of these are slow leaks, not floods, so the first clue is usually a smell or a stain. See attic and roof-leak mold and bathroom and kitchen mold.
Rain at the airport, smoke in 2019
NOAA's 1991–2020 normals for the airport station just outside Windsor show 33.78 inches of rain a year, a little more than central Santa Rosa, CA. December, January and February each bring around 6.7 inches, while July is nearly dry. A leak that starts in a February storm can look dry by summer while the wall cavity behind it stays damp.
In October 2019 the Kincade Fire put nearly all of Sonoma County, Windsor included, under evacuation orders. If your home took smoke cleaning or firefighting water then, it is fair to ask whether any wet insulation was left in place. Smoke cleanup and mold remediation are separate scopes; one does not fix the other. The fire and rebuild moisture page covers this.
Hiring for a Windsor job
Windsor has its own building department, so check with the town on permits for drywall, plumbing or roof work. California issues no mold license. Jobs of $1,000 or more need a CSLB-licensed contractor, and the down payment is generally capped at $1,000 or 10% of the price, whichever is less. If a warranty might still apply to a recent repair, ask the inspector to document the water source in writing.
Published estimates, not quotes: attic work often runs $1,000–$4,000 (This Old House 2026) and a bathroom $500–$1,500 (Fixr 2025). Windsor quotes come from the companies. More in the cost guide.
Windsor mold questions
My Windsor house was built in the 1990s. Why would it have mold?
Water causes mold, not age, and 1990s homes are reaching the point where roofs, flashing, water heaters and supply lines start to fail. Those leaks tend to be slow and hidden. A musty smell in one room, a soft spot in the floor or a ceiling stain is worth a moisture check before the problem spreads.
Does a newer Windsor home need asbestos testing before mold work?
Less often than an older house, since only 14.7% of Windsor homes were built before 1980. The build year alone doesn't settle it, though. If the scope includes cutting out drywall, ceiling texture or flooring, ask the company whether it recommends testing those specific materials first, and get the answer in writing.
How can I tell attic mold from a roof leak versus condensation?
A roof leak usually leaves a defined stain or soft spot near a valley, vent or flashing, often wetter after storms. Condensation tends to show as even darkening across sheathing, often near the eaves, and is linked to bath fans or weak ventilation. The fix differs, so ask the inspector which one they see before you approve a scope.
Nearby towns and services
Get Windsor mold quotes
Mention the year your home was built if you know it, where the stain or smell is, and any recent roof, plumbing or appliance trouble. Independent companies that serve Windsor reply to you. Rather talk it through? Call (707) 896-6015
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Free, no-pressure quotes from independent companies across Santa Rosa, Petaluma, Rohnert Park, Windsor and Sonoma County.