Altadena, CA
Mold Remediation in Altadena, CA
Altadena, CA has 7 mold remediation companies in our listings, 2 list themselves as open 24 hours and the most reviewed is ProDetect Mold Inspection of Pasadena with 177 reviews.
7 Companies Doing Mold Work in Altadena
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Can You Handle It Yourself
DIY with care
Federal guidance treats about 10 square feet, roughly a 3 by 3 foot patch, as the line for a careful homeowner with gloves, goggles and an N95. Past that, or when mold is inside walls, in the HVAC system, or someone in the home has asthma or a weak immune system, hire a specialist.
Questions to Ask Before You Hire
- Where do you think the moisture is coming from, and who fixes it?
- Will you set up containment and negative air, and how will you protect the rest of the home?
- Who does the clearance testing after the work, and is that person independent from you?
- What exactly will you remove, and what will you clean and keep?
- Is your company licensed for mold work where this job is?
Guides for This Job
- DIY with careSafe DIY Mold Cleanup for Areas Under 10 Square FeetA step by step method to clean up mold under 10 square feet safely, with the gear to buy, what to throw away, why bleach is not the default, and when to stop.
- DIY with careMold Remediation Cost in 2025 and 2026Typical 2025 to 2026 mold remediation costs by area and location, from bathrooms to attics, plus testing, containment and rebuild, and what moves the price.
- DIY with careSafe DIY Mold Cleanup for Areas Under 10 Square FeetA step by step method to clean up mold under 10 square feet safely, with the gear to buy, what to throw away, why bleach is not the default, and when to stop.
- DIY with careAttic Mold on Roof Sheathing, Causes and FixesWhy mold grows on attic roof sheathing, how to find the cause, the fixes that stop it for good, and how to tell a cosmetic stain from a roof that needs work.
Questions People Ask
How many mold remediation companies serve Altadena?
We list 7 companies in Altadena, CA. 3 of them work from a service area without a public storefront.
Which mold remediation companies in Altadena are open 24 hours?
2 list themselves as open around the clock, including Prime Rescue and Valley Green Construction. Hours are self reported, so call to confirm someone answers at night.
Who has the best reviews in Altadena?
Among companies with at least 20 public reviews, the highest rated are ProDetect Mold Inspection of Pasadena (5.0 from 177) and 24H Mold Inspection of Pasadena (5.0 from 48). A high rating from a small number of reviews is weaker evidence than a slightly lower rating from hundreds.
What should I do before a company arrives in Altadena?
Stop the source if you safely can, shut off power to wet areas at the panel only if you are standing somewhere dry, photograph everything, and move valuables out of the water. Our step by step guide covers the first hours in detail.
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