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There are simple ways to fix a radon problem that aren't too costly. Even very high levels can be reduced to acceptable levels. The Housing and Urban Development (HUD) 203(k) Mortgage Insurance Program allows home buyers to finance the purchase and repair or improvement of a home using a single mortgage loan. Reducing radon levels in a home is an eligible improvement for this program.
If an existing home has high radon levels, the levels can be reduced. A variety of methods can be used to reduce radon in homes. In most cases, a system with a vent pipe(s) and fan(s) is used to reduce radon. These "sub-slab depressurization" systems do not require major changes to homes. Similar systems can also be installed in homes with a crawl space, called "sub-membrane depressurization." These systems prevent radon gas from entering the home from below the concrete floor or the crawlspace and from outside the foundation. Radon mitigation contractors may use other methods that may also work. The right system depends on the design of your home and other factors.
If you are building a new home: You and your builder can design your new house to be radon resistant. Radon resistant construction usually add about $350 to $500, on average, to the price of a newly built home. The U.S. EPA published a book called Building Radon Out [PDF] to explain more about these techniques.
An added bonus of using radon resistant construction is that, in addition to reducing radon levels inside the home, these steps may also control moisture and increase energy efficiency.