Fast, Reliable Mold Remediation Across Hillsborough
Mold in a Hillsborough home isn’t like mold anywhere else on the Peninsula. When it gets into original lath-and-plaster walls behind 1930s hand-troweled finishes or spreads through the old-growth redwood framing of a Mediterranean Revival estate, you can’t just cut out drywall and call it done. Wade’s Restoration of California works on mold jobs in Hillsborough weekly, and we know what those homes demand. Call (855) 915-0646 and we’ll walk you through what you’re dealing with, honestly, before anyone picks up a saw.
Why Wade’s Restoration of California Is Hillsborough’s Preferred Mold Remediation Company
Wade Ferris started this company in 2007, and he still answers his own phone. That matters in Hillsborough, where homeowners want to know the person walking into their house is someone they’ll see again at the Hillsborough Racquet Club or the block party on Butternut Drive. We publish our name, our address, and our license number. We don’t hide behind a call center.
Hillsborough jobs come with a specific set of concerns that most remediation companies never see. The town has minimum half-acre lots, no commercial buildings, and homes that pre-date modern waterproofing. When we work here, we’re dealing with clay barrel tile roofs, lime-based plaster, and original hardwood floors that have been in place since before World War II. A crew that learned mold work on 1990s tract homes in San Mateo is not prepared for what’s behind a Hillsborough wall. We are.
Our response time to Hillsborough is typically under an hour for emergency calls. Wade or a member of his crew heads out the moment you call, because every hour mold sits in a plaster wall cavity is another hour it spreads through the plaster keys and into adjacent rooms. That’s not scare talk. We see it happen.
Every mold job in Hillsborough carries our 90-Day Done Right Promise in writing. If the mold comes back or we miss something, Wade makes it right. No arguing, no fine print. He’s been doing this for nearly two decades, and his reputation in the neighborhoods along Chateau Drive and Pullman Road is the reason we keep getting calls.
Our Mold Remediation Services in Hillsborough
Mold Inspection & Testing
In Hillsborough, a mold inspection has to account for construction methods that modern inspectors rarely encounter. Standard moisture meters give false “dry” readings on lime-based plaster because the mineral content skews the sensor. We supplement with thermal imaging and core samples when a wall reads dry but smells like a damp cellar. Most inspections on Hillsborough estates run $350-$650, depending on square footage and the number of areas being tested. That includes a written report your adjuster can use.
Mold Removal
Removing mold from a Hillsborough home means controlling the spread before you open anything. Original plaster walls hold mold spores in the keys between the lath strips, so cutting one opening can send a plume through the house if containment isn’t done right. We set up negative air pressure with HEPA-scrubbed exhaust and physical barriers before the first cut, then remove affected plaster, insulation, and any damaged framing. Typical mold removal in Hillsborough runs $1,800-$6,500, with larger custom homes on the hillside lots pushing higher depending on how far the colonization has traveled.
Black Mold Remediation
Black mold, usually Stachybotrys chartarum, thrives in the kind of humid, slow-drying environments Hillsborough’s older homes create. A fire wall chase, an unvented crawl space on a steep lot, or a copper pipe sweating inside a lath-and-plaster wall are all places we’ve found it. Black mold remediation in Hillsborough doesn’t cost more because the mold is black; it costs more because the materials around it are harder to treat. Expect $2,500-$8,000 on an estate home, with the upper end reflecting original finishes that require specialty treatment rather than removal.
Air Quality Restoration
After remediation, the air in a Hillsborough home has to be cleaner than it was before the mold appeared. We run air scrubbers with HEPA filtration throughout the affected zone, and we take before-and-after spore trap samples so you can see the numbers drop. On Hillsborough jobs, this often includes treating the HVAC system because forced-air systems in older homes pull from crawl spaces that have been damp for decades. Air quality restoration typically adds $900-$2,400 to a mold project.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Hillsborough
When the mold is in a crawl space under a 1960s mid-century modern on a Hillsborough hillside, we bring equipment that’s built for that environment. Wade’s crews run Phoenix axial air movers, Dri-Eaz LGR dehumidifiers, and Injectidry systems for drying wall cavities in place. Our technicians hold IICRC certifications and follow RIA guidelines, and we’re an IFA-recognized firm. The equipment matters, but knowing how to move air through plaster and old-growth framing without cracking it is the part you can’t buy from a catalog.
Common Mold Remediation Problems We See in Hillsborough Homes
- Hidden mold behind original lime plaster. Lime-based plaster wicks moisture laterally through the plaster keys, so mold spreads behind the wall surface long before you see staining on the finish. We find colonies that have traveled ten feet from the original water source, all hidden behind intact paint.
- Failed hillside drainage feeding the crawl space. Steep lots in upper Hillsborough, especially above the Crystal Springs watershed, push groundwater toward foundation walls during winter storms. A French drain that failed years ago keeps the crawl space wet enough for mold to re-bloom within weeks of remediation.
- False “dry” readings on old plaster. Standard pin meters designed for drywall don’t read accurately on mineral-rich lime plaster. A contractor who clears a job based on those numbers is leaving moisture in the wall, and the mold will be back. We verify with multiple methods before we call a job done.
- Planning Department complications after unpermitted cuts. Hillsborough requires documentation and often Planning sign-off when you cut into original plaster or tile on a historic estate. If the remediation crew doesn’t photograph and document everything before opening walls, you’re dealing with code issues and insurance disputes on top of the mold.
Pricing for Mold Remediation in Hillsborough, CA
Mold remediation in Hillsborough runs higher than neighboring San Mateo or Burlingame for a simple reason: the homes are custom estates full of irreplaceable materials. A straight crawl space treatment on a 1950s lot might cost $2,000-$4,500. Remediation inside finished living space with original plaster, imported tile, or hand-applied finishes runs $4,000-$12,000 or more. What pushes the number up: the size of the affected area, how far mold has spread through plaster keys, whether clay tile or stone has to be temporarily removed, and whether hillside drainage needs to be addressed before the space can be dried. We give a written scope before work starts, and your first estimate is free. Call (855) 915-0646 and we’ll tell you what we’d expect to find before we ever set foot in the house.
We Also Serve Cities Near Hillsborough
Wade’s crews handle mold work across the upper Peninsula. If you’re in Burlingame, Millbrae, San Mateo, or San Bruno, the same team that knows Hillsborough’s plaster walls and steep lots is available to you. You can read more about our approach on our Mold Remediation page, or see the dedicated Mold Remediation in Hillsborough page if you want the details specific to this town.
Serving Hillsborough, CA - Our Local Coverage Area
We’re based in the Hillsborough area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Mold Remediation in Hillsborough
Yes, in most cases Hillsborough’s Building Department and Planning Division require documentation and often a permit before you cut into original plaster, tile, or other historic finishes on an estate home. The town’s strict municipal codes treat emergency mitigation work on older homes as a reviewable action, especially when original materials are involved. Wade’s crew photographs and documents everything before we open walls, and we coordinate with Planning so you’re not left holding a code violation. Call (855) 915-0646 and we’ll tell you what your specific situation will require.
No. If water is still entering the crawl space from a failed French drain or a saturated hillside, any mold remediation is temporary. The mold will re-wet and re-bloom within weeks. On upper Hillsborough lots above the Crystal Springs watershed, we coordinate with landscape drainage contractors before or during the mold job so the space actually dries and stays dry. Skipping that step is the most common reason Hillsborough homeowners pay for mold work twice.
Slowly. Lime plaster can’t be blasted with heat or high-velocity air without cracking and spalling. We use Dri-Eaz LGR dehumidifiers and controlled airflow directed through access panels, bringing the moisture content down gradually over several days. On a 1930s Spanish Colonial off Butternut Drive, we held a wall cavity at controlled humidity for six days to dry it below 15% moisture content without losing the three-coat plaster finish. Rush the drying and you lose the wall.
Mold inspection tells you what’s there. Air quality restoration tells you what’s floating in the air after the mold is gone. In Hillsborough homes with original finishes, we often do both: inspection to find hidden colonies behind plaster and under original hardwood, and air quality restoration afterward to scrub spores from the HVAC system and the living space. Inspection is a diagnostic step. Air quality restoration is a finishing step. Both matter in a house where the air moves through 70-year-old ductwork.
Sometimes, yes. If the mold is behind a substrate and the finish is still intact, we can often treat it through controlled access points, dry the cavity fully with Injectidry systems or similar, and treat the framing with an IICRC-approved antimicrobial without removing the tile or paneling. It depends on how far the mold has spread and whether the finish material itself is colonized. We’ll tell you straight what’s salvageable and what isn’t before any work begins. Call (855) 915-0646 for a free assessment.
If you’ve got a musty smell in a hallway, a suspicious stain climbing an original plaster wall, or a crawl space that’s been damp since the last atmospheric river, call Wade’s Restoration of California at (855) 915-0646. We’ll talk through what you’re seeing, give you an honest read on what it’ll take, and if you want us there, Wade or one of his guys will be at your door. Estimates are free. The 90-Day Done Right Promise comes in writing. And you’ll know exactly who you’re dealing with.
Written by Wade Ferris, Owner at Wade’s Restoration of California, serving Hillsborough and the upper Peninsula since 2007.