Independent mold and air quality testing across the city of Los Angeles, from pre-war duplexes to new construction.
Los Angeles housing stock spans a century, and each era fails differently. Pre-war buildings hide moisture behind lath and plaster where nothing shows on the surface until the paint lifts. Post-war slab-on-grade tracts move water sideways under the floor, so a leak that starts in the kitchen surfaces in a bedroom two rooms away. Newer stucco and tight building envelopes trap interior humidity that older, leakier houses used to vent on their own. We map moisture before we sample, so the report tells you where the water is coming from, not just that spores were present.
Los Angeles covers everything from 1920s Spanish and Craftsman homes in neighborhoods like Los Feliz, Silver Lake and Mid-City to postwar stucco tracts, hillside homes above Hollywood and large apartment buildings in Koreatown and Westlake. That range matters because mold shows up differently in each. Older homes often have original galvanized supply lines, cast iron drains and raised foundations where slow leaks go unnoticed for months. Hillside homes deal with soil moisture against retaining walls and lower-level rooms built into the slope. Apartment buildings share plumbing walls, so a leak in one unit can appear as staining or odor in the unit next door or below. We tailor the inspection to the building type, start with moisture readings in the most likely problem areas and only recommend sampling when it will answer a real question.
We work with homeowners, renters, landlords, property managers, real estate agents, buyers and sellers in Los Angeles. Some clients call after a leak or a musty smell, others need documentation for a landlord, an HOA or an insurance claim, and many book before closing on a home. Whatever the reason, you get an independent inspector, honest answers and a clear written report.
We start with a $49 professional mold inspection. If you proceed with mold testing during the visit, the $49 fee is waived. Any recommended testing is priced and explained before samples are collected, and nothing is sampled without your approval.
Samples go to an independent accredited laboratory, and results are typically back in 24 to 48 hours. Rush lab options are available if you are facing an escrow deadline, a move-in date or a landlord dispute.
Yes. Tenants book with us regularly. Our report documents what we observed and what the lab found, which gives you clear information to share with your landlord or property manager.
A musty odor that will not go away, staining on ceilings or walls, peeling paint, a recent leak, or allergy-type symptoms that improve when you leave the home are all good reasons to book. An inspection helps you understand whether moisture is present and whether testing is worth doing.
Yes. We inspect offices, retail spaces, restaurants and multi-unit residential buildings in addition to single-family homes. Tell us about the property when you book so we can plan the right amount of time and equipment for the visit.
Just Mold Testing is an independent inspection and testing company. We do not perform mold removal in Los Angeles or anywhere else, and we never will. The company that finds the mold should not be the company that profits from removing it.
You get a written report with the laboratory data, an explanation of what the numbers mean, and practical next steps. If remediation is needed we tell you exactly what to ask a contractor for, then we are happy to return afterwards for independent post-remediation verification.
Related: how mold air sampling works, surface sampling, post-remediation verification, and mold testing for property managers and multifamily properties.
October 2026
Residential · Mold inspection with surface sampling
Dark spotting on a bathroom ceiling next to the exhaust fan. Our inspector took a swab sample of the spots for the lab and checked the cabinet under a sink with a moisture meter.
October 2026
Residential · Mold inspection with thermal imaging and air testing
Our inspector scanned the living area ceiling with a thermal camera and took an outdoor control air sample from the balcony to compare with the indoor air.
October 2026
Residential · Air testing
Our inspector took an air sample in a room where a section of wall had been opened, exposing the framing and plumbing.