Once you find out your home has elevated radon, the next worry is usually how disruptive the fix will be. Good news: radon mitigation is one of the fastest and least invasive home upgrades there is. For the vast majority of Denver homes, a complete system is installed in a single 3 to 4 hour visit, and you can stay home the entire time.
The Short Answer: 3 to 4 Hours
A standard sub-slab depressurization system on a typical single-family home takes a certified crew about half a day. Larger homes, multiple foundation types, or crawlspaces that need a sealed vapor barrier can stretch the job toward a full day, but a single visit is almost always enough to finish the entire installation.
- Standard basement or slab system: 3 – 4 hours
- Crawlspace with vapor barrier: 4 – 6 hours
- Homes with multiple foundations or complex routing: up to a full day
- Post-install radon test: runs for 48 hours afterward to confirm results
Step by Step: What Happens on Install Day
Understanding the process takes the mystery out of it. Here is what a typical installation looks like from the moment our crew arrives to the moment they pack up.
- Walkthrough and plan: the technician confirms the suction point location and the cleanest route for the pipe.
- Suction point: a hole is cored through the slab to access the soil beneath your foundation.
- Piping: PVC pipe is run from the suction point up and out, either through the interior to the attic or along the exterior wall.
- Fan installation: an inline radon fan is mounted to continuously draw gas out and vent it above the roofline.
- Sealing: foundation cracks, sump pits, and other openings are sealed to maximize suction.
- System check: the manometer is installed and the technician verifies airflow before leaving.
Most homeowners are surprised that something so important takes less time than getting a new dishwasher installed.
How Soon Will Radon Levels Drop?
The system starts working the moment the fan is switched on. Radon levels typically fall by 90 percent or more within 24 hours. To document the result, a follow-up test runs for about 48 hours after installation, confirming your home is safely below the EPA action level of 4.0 pCi/L.
Do You Need to Prepare Anything?
Preparation is minimal. Just clear access to your foundation walls, basement, or crawlspace and make sure the crew can reach the planned pipe route. There is no need to leave the house, shut off utilities, or relocate for the day. Our team cleans up completely before leaving.
Ready to get it done? Custom Radon installs most Denver systems in a single afternoon, guarantees levels below 4.0 pCi/L, and backs every job with a lifetime warranty. Schedule your free in-person estimate and we will map out exactly what your install day will look like.
Worried About Radon in Your Home?
Get a free in-person estimate and a complimentary test kit. We guarantee levels below 4.0 pCi/L, backed by a lifetime warranty.
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