Reviewed and updated September 10, 2026. This article provides general public-health and referral guidance, not testing, medical, legal or engineering advice.
Think in four stages, not one appointment
A complete mitigation project includes assessment, installation, startup checks and post-mitigation testing. The visible construction may take one working day in a straightforward basement, but a complex foundation, crawlspace membrane or difficult route can require more time.
No article can promise the duration for a particular home. The contractor should inspect the foundation and explain the work before giving a schedule. Ask whether diagnostic work and electrical coordination happen before installation day.
Assessment determines whether one suction zone is enough
The professional reviews the radon report, foundation types, additions, sump and drainage features, finished areas and possible discharge routes. Pressure-field diagnostics may show whether suction at one point reaches the needed sub-slab area.
A connected basement and slab may behave differently from two isolated additions. Crawlspaces may require membrane work. Discovering those conditions during assessment makes the installation estimate and timeline more credible.
Installation day creates a functioning building system
Typical work can include creating suction openings, installing gas-tight piping, setting the fan in an allowed location, routing discharge, sealing selected openings, adding a monitor and warning label, providing electrical connection and cleaning the work area.
The homeowner should receive an explanation of the route, fan, disconnect, monitor and service points. If the sump becomes part of the design, the cover must preserve drainage and service access; see the sump guide.
Does it work? Measure after startup
EPA describes soil-suction systems as effective methods for reducing radon in many homes, but the result for one installation is established by testing. The system's pressure indicator confirms a pressure difference, not the indoor radon concentration.
Ask when the post-mitigation test will begin and whether the test is included. Keep the before-and-after reports. If the result does not meet the agreed objective, the installer should explain the diagnostic and adjustment process rather than relying on fan sound or assumptions.
Maintenance continues after the first good result
Fans and alarms are mechanical or electrical components and do not last forever, but reliable service life depends on the product and operating conditions. We do not publish a universal fan-life promise. Check the monitor routinely and follow the manufacturer's and installer's maintenance information.
Retest according to current public-health guidance and after significant foundation, HVAC or occupancy changes. Do not switch the system off to save energy or test the unmitigated house. For price planning, use the regional mitigation-cost guide.
Sources
Primary guidance used for this article
We use government and public-health sources, distinguish historical datasets from current household measurements, and do not invent local results. Read our editorial policy.