--- title: Cost to Activate a Passive Radon System canonical: "https://radonmitigationyorkpa.net/radon-guide/passive-radon-activation-cost/" pubDate: "2026-10-01T00:00:00.000Z" updatedDate: "2026-10-03T00:18:00.000Z" author: Radon Mitigation York PA description: "What it costs to add a fan to a passive radon pipe, what the job includes, and how to tell if your York home is radon-ready." --- # Cost to Activate a Passive Radon System The cost to activate a passive radon system is usually well below the [price of a full new radon system](/radon-mitigation-cost/), because the pipe under the slab is already in place. Our activation price is $500 to $900. The job mainly adds a fan, electrical work, a manometer and a clearance test, set by a free written quote. ## How much does it cost to activate a passive system? A passive radon system is a pipe that runs from a gravel layer under the slab up through the house to the roof. It relies on natural air movement, called the stack effect, to carry soil gas out. Many newer York-area homes were built this way and are often called "radon-ready." Passive systems can lower radon some, but many do not get a home below the EPA action level of 4.0 pCi/L. Adding a fan turns the passive pipe into an active system, which pulls much harder. | Item | Typical in an activation | Our price | |---|---|---| | Radon fan | Inline fan sized to the pipe and soil | $935 to $1,320 | | Fan location | Attic or exterior, never in living space | Included | | Electrical | Outlet or switch near the fan | $150 to $350 if a new outlet is needed | | Manometer | U-tube gauge to show suction | Included | | Sealing | Sump lid, visible cracks | Included, or $100 to $250 for heavy sealing | | Clearance test | Post-install test | Included | ## What changes the price ### Where the fan can go Radon fans must sit outside the living space, usually in the attic or on the exterior. If the passive pipe runs up through the attic, the fan can often go there. If the attic is hard to reach, the job takes longer. ### Power at the fan location Many attics have no outlet near the pipe. Adding a circuit or switch is often the biggest extra cost in an activation. ### Pipe condition Builders sometimes leave pipes uncapped, unlabeled or poorly glued. Some pipes are blocked by insulation or debris. We check the full run before we add a fan. ### Whether the slab is really "ready" A passive pipe only works well if there is a gravel layer and a sealed slab under it. If the builder skipped the gravel or the slab is badly cracked, the fan may not create enough suction. In that case, more sealing or an added suction point may be needed. ## How to tell if your home is radon-ready Look in the basement or utility room for a 3 or 4 inch PVC pipe coming out of the floor, often labeled "radon." Then look for the same pipe in the attic, running up through the roof. If you see both, you likely have a passive system. You can confirm it with a radon test. If the result is at or above 4.0 pCi/L, activation is often the lowest-cost fix. EPA also says to consider fixing levels between 2 and 4 pCi/L. The [EPA radon page](https://www.epa.gov/radon) has more general guidance. ## Why activation is worth it EPA estimates radon causes about 21,000 lung cancer deaths a year in the U.S. York County is in [EPA Radon Zone 1](https://www.epa.gov/radon/epa-map-radon-zones-and-supplemental-information), the highest potential category. If your home already has the pipe, adding a fan is one of the lowest-cost ways to bring levels down. Learn more about how we do it on our page about [passive radon system activation in York](/services/passive-radon-system-activation/). ## Passive pipes in larger buildings Some newer apartment buildings, offices and schools also have passive pipes. Activating those can involve several fans and more electrical work. Our guide on [commercial radon mitigation cost](/radon-guide/commercial-radon-mitigation-cost/) covers how larger buildings are priced. ## Key takeaways - Activation adds a fan to a pipe that is already in place. - It usually costs much less than a new system. Our price is $500 to $900. - Electrical work and attic access are the main price drivers. - Test before and after activation to confirm the result. ## Frequently Asked Questions ### Can I just add a fan myself? A wrong fan, a fan in living space, or a poor seal can cause problems. Pennsylvania requires DEP certification for anyone mitigating radon for someone else, and a certified installer also checks the slab, pipe and discharge. ### Will activation get my home below 4.0 pCi/L? In many homes, yes. The clearance test confirms it, and our written guarantee covers the result. ### Does an active system use much electricity? Most residential radon fans draw roughly 15 to 150 watts, so the monthly cost is usually modest. ## Next step Call [(717) 356-3035](tel:+17173563035) any time for a same-day callback and a free written quote.