Los Angeles County · Commercial remediation
Commercial Mold Remediation in Los Angeles
Commercial mold remediation removes mold from offices, restaurants, retail spaces and apartment common areas while the business keeps running. We find the moisture source, work after hours where needed, follow a written protocol, and document each step for owners, insurers and LAHD or County inspectors. Every job gets a written scope and quote before work starts.
- Emergency24/7 response
- CoverageAll of Los Angeles County
- PricingQuote before any work starts
- StandardANSI/IICRC S520
- Call(213) 659-0672
Scope
How is commercial mold remediation different from residential?
The cleanup method is the same: fix the water, contain the area, remove what can’t be cleaned, HEPA clean the rest, and verify. What changes is everything around it. Commercial jobs need a written protocol, scheduling around occupants, phased work, worker safety compliance, and paperwork that satisfies owners, insurers, tenants and code inspectors.
The main references are ANSI/IICRC S520 and the EPA’s “Mold Remediation in Schools and Commercial Buildings.” Crews work under Cal/OSHA rules, and remediation that is part of construction work over $1,000 needs a contractor licensed by the CSLB. You can check any license at cslb.ca.gov before signing.
For the full method, see our main mold remediation services in Los Angeles page. This page covers what is specific to businesses and income properties.
Property types
What kinds of commercial properties need mold remediation?
Any building with plumbing, a roof and an HVAC system can grow mold. In Los Angeles we see it most in offices with roof or AC condensate leaks, restaurants with hidden kitchen and walk-in cooler moisture, retail spaces below other units, and the common areas of older apartment buildings.
Offices
Ceiling tiles stained by roof leaks, wet carpet under desks, and HVAC condensate problems. Work is usually phased by suite or floor, at night or on weekends.
Restaurants
Leaks behind dish stations, cooler and freezer condensation, grease-trap areas and wet wall cavities. Containment keeps dust away from food prep, and work is scheduled after close.
Retail
Back-of-house storage, restrooms, and units under leaking upper floors. Inventory may need cleaning or packout, and sales floors stay open behind sealed containment.
Multifamily common areas
Laundry rooms, hallways, garages, trash rooms and shared plumbing walls in older RSO buildings. Tenant notices and access schedules are part of the plan.
Medical and schools
Occupants may be more vulnerable, so containment and clearance standards are stricter, and an outside industrial hygienist often writes the protocol.
Warehouses and industrial
Roof leaks over stored goods, slab moisture and wet cardboard. Large open areas are cleaned in zones so operations can move around the work.
Business continuity
Can mold remediation be done without closing the business?
Usually, yes. Most commercial jobs are done after hours or in phases, with sealed containment and HEPA air scrubbers keeping the work area under negative pressure so spores and dust don’t reach occupied space. A full closure is rare and usually limited to large, heavily contaminated areas or sensitive occupants.
- After-hours and weekend work: demolition and noisy steps happen when the space is empty.
- Phased zones: one suite, floor or section at a time, so the rest keeps operating.
- Containment you can work next to: poly walls, zipper doors and negative air, checked daily.
- HVAC isolation: affected supply and return vents are sealed so the building’s air system doesn’t carry spores.
- Clean daily handoff: the area outside containment is HEPA vacuumed before staff or customers return.
- Occupant notices: a simple written notice for staff or tenants explaining what is happening and when.
Timelines vary with size and drying time. Our guide on how long mold remediation takes explains what affects the schedule.
Protocol and clearance
Why does a commercial job need a protocol and independent clearance?
A remediation protocol is a written scope: what is affected, the containment level, what gets removed, how it is cleaned, and what “done” means. Independent clearance testing then checks the work against that definition. Together they give owners, insurers and inspectors a record that doesn’t rely on the contractor’s word.
- Assessment. Moisture mapping, thermal imaging, and air or surface samples analyzed by an accredited lab, with an outdoor control.
- Written protocol. Areas, containment level, materials to remove, cleaning methods and clearance criteria, ideally written by someone who isn’t doing the removal.
- Source repair. The leak, condensate line or drainage issue is fixed by the right trade.
- Remediation. Containment, removal of porous materials, HEPA vacuuming and damp-wipe cleaning, and drying.
- Clearance. A visual check, moisture readings and post-remediation clearance testing before containment comes down.
- Closeout report. Photos, logs, lab results and the clearance letter in one package.
We recommend clearance by a separate inspector, never the crew that did the work. Our guide to hiring an independent mold inspector explains why that separation protects you.
Documentation
What documentation should a commercial mold job produce?
At minimum: the assessment, the written protocol, before and after photos, daily logs, moisture readings, a waste disposal record, lab reports, and a clearance letter. That package is what closes a code case, supports an insurance claim, and answers tenant or buyer questions later.
| Document | Who uses it |
|---|---|
| Assessment and lab results | Owner, insurer, protocol writer |
| Written protocol and scope | Contractor, insurer, property manager |
| Daily logs, photos, moisture readings | Owner, adjuster, attorney if disputed |
| Clearance report from an independent inspector | Code inspector, tenants, future buyers |
| CSLB license number and certificate of insurance (COI) | Owner, landlord, property manager, HOA |
Ask any contractor, including us, for the license number and COI before work starts.
Code cases
What if LAHD or LA County inspectors cited the building for mold?
Since SB 655, visible mold growth is a substandard-housing condition under Health and Safety Code 17920.3, except minor mold on surfaces that normally get wet, like a shower. In the City of LA, LAHD inspects and the owner typically gets up to 30 days to correct. Fix the source, remediate, and keep the clearance report.
| Where the building is | Who enforces | Contact |
|---|---|---|
| City of Los Angeles | LA Housing Department (LAHD) Code Enforcement, including the Systematic Code Enforcement Program | (866) 557-7368 |
| Unincorporated LA County and cities under the County Health Code | LA County Public Health, Environmental Health | (888) 700-9995 |
| Long Beach | Long Beach Code Enforcement | (562) 570-2633 |
| Pasadena | Pasadena Code Compliance | (626) 744-8633 |
| Santa Monica | Santa Monica Code Enforcement | (310) 458-4984 |
| Glendale, Torrance | Not under County housing enforcement | Call city hall |
Uncorrected citations matter. Under Civil Code 1942.4, a landlord can owe tenants damages if a cited condition isn’t fixed in time. Owners who know of mold that is a health threat also have written disclosure duties under the Toxic Mold Protection Act (HSC 26147). Our overview of California mold laws covers these in plain English, and tenants can use our who-to-call guide by city.
Older buildings
Do older LA commercial buildings need asbestos or lead testing first?
Often, yes. Many LA buildings predate 1978, and drywall compound, ceiling texture, floor tile, pipe wrap and paint may contain asbestos or lead. Test before cutting. Asbestos work over 100 square feet needs a CSLB asbestos-certified contractor registered with Cal/OSHA (DOSH), and disturbing pre-1978 paint falls under EPA lead-safe (RRP) rules.
See combined mold and asbestos testing and our page on mold abatement in older buildings.
Cost
How much does commercial mold remediation cost in Los Angeles?
A contained area in one office suite or common area typically falls in the $1,500–$6,000 range. Large, multi-area or structural commercial jobs often run $10,000–$30,000 or more. After-hours labor, phasing, access, asbestos and the number of clearance samples all move the number.
| Service | Typical LA range |
|---|---|
| Visual inspection with moisture mapping | $250–$500 |
| Inspection with 2–3 air samples plus outdoor control | $400–$800 |
| Each additional air or surface sample | $75–$150 |
| Small remediation (under 10 sq ft, one area) | $500–$1,500 |
| Single suite, restroom or common-area section | $1,500–$6,000 |
| Large, multi-area or structural | $10,000–$30,000+ |
| Post-remediation clearance test | $300–$600 |
Typical industry ranges for the Los Angeles area. Your written quote depends on the size, access and materials involved.
For residential and multi-unit price detail, see our Los Angeles mold remediation cost guide.
FAQ
Commercial mold remediation FAQ
Do we have to close the business during mold remediation?
Usually not. Most commercial jobs are phased or done after hours behind sealed containment with HEPA air scrubbers, so the rest of the space can stay open. Closure is usually limited to large, heavily affected areas or buildings with sensitive occupants.
Is mold inspection required before commercial remediation?
California does not require it by law, but it is the normal practice for commercial jobs. An assessment with moisture mapping and lab samples defines the scope, supports the protocol, and gives a baseline for clearance testing afterward.
What license does a commercial mold remediation company need in California?
California has no mold-specific license. Remediation that is part of construction work over $1,000 needs a CSLB-licensed contractor. Asbestos work over 100 square feet needs CSLB asbestos certification and Cal/OSHA DOSH registration. Check licenses at cslb.ca.gov.
How do I close an LAHD mold citation?
Fix the moisture source, remediate the affected area, and keep records: photos, invoices and a clearance report. LAHD reinspects to confirm the condition is corrected. Owners typically get up to 30 days to fix a cited condition. Call LAHD at (866) 557-7368 with case questions.
Who should do clearance testing on a commercial job?
An independent inspector or industrial hygienist who did not do the removal. Clearance usually includes a visual check, moisture readings, and air samples compared with an outdoor control, analyzed by an accredited lab.
Does commercial property insurance cover mold remediation?
It depends on the policy. Coverage usually applies when mold follows a sudden, accidental water event, and many policies have mold sublimits or exclusions for long-term leaks. Good documentation from the start makes any claim easier to support.
Can you work in occupied apartment buildings?
Yes. Common areas and individual units can be remediated while the building stays occupied, with containment, written tenant notices and scheduled access. Whether a specific household should stay in a unit during work depends on the size of the job and the health of the people living there.
Sources
- U.S. EPA, “Mold Remediation in Schools and Commercial Buildings”: epa.gov/mold
- ANSI/IICRC S520, Standard for Professional Mold Remediation
- LA Housing Department, code enforcement: housing.lacity.gov
- LA County Department of Public Health, Environmental Health: publichealth.lacounty.gov
- Contractors State License Board: cslb.ca.gov
- California Health and Safety Code 17920.3 (SB 655) and 26147; Civil Code 1942.4
Last updated October 2026. Prices are typical Los Angeles ranges, not a quote. Legal summaries are general information, not legal advice.
Need a scope, a schedule and a paper trail?
Call (213) 659-0672, 24/7 across Los Angeles County. We’ll walk the site, find the moisture source, and give you a written scope and quote before any work starts.