Radon and Mold Testing Timelines During Real Estate Transactions

Both radon and mold testing typically take about 3 business days from start to finish, but they get there differently — worth understanding if you're coordinating testing around a specific closing date or contingency deadline.

Radon Testing Timeline

Radon testing's timeline is monitoring-driven: certified electric monitors are placed and left in your home for a full 48 hours before they can be retrieved, followed by about 24 hours for the written report.

That 48-hour minimum isn't flexible — it's the time needed to capture an accurate reading, so radon testing generally needs to be scheduled with at least 3 full days of runway before you need results in hand.

Mold Testing Timeline

Mold testing's timeline is lab-driven: on-site sample collection itself takes only about 30 minutes, but the samples then require roughly 2 business days of lab processing, plus about 1 additional business day for the written report.

Again landing around 3 business days total, but starting the clock differently (from your appointment date rather than from a 48-hour monitoring endpoint).

Planning Around Your Inspection Contingency

If you're working with a standard 10-day inspection contingency, both tests generally fit comfortably, even scheduled together in a single appointment.

If your timeline is tighter — a 5-day or shorter contingency, for example — it's worth scheduling as early in that window as possible, since neither test can meaningfully be rushed faster than its underlying process allows (radon's 48-hour minimum, mold's lab processing time).

Schedule a radon or mold test today with DezAir Quality Testing online at dezairqualitytesting.com.